尘曲
c62db4af45
放弃基于背景亮度阈值的方案（会误伤折痕附近的文字）。 改用频域特征区分： - 文字 = 高频信号，笔画边缘锐利，局部灰度方差高 - 折痕/阴影 = 低频信号，缓慢渐变，局部灰度方差低 计算灰度图的局部方差（|gray-localMean|的局部均值）， 低方差+有墨迹的像素判定为折痕/阴影，按方差比例推向白色。 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
1167 lines
41 KiB
C#
1167 lines
41 KiB
C#
// Quicker C# 模块 - 扫描全能王工具 v2
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// 运行线程: 后台线程(STA)
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//
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// ====== DLL 部署说明 ======
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// 1. 从 NuGet 下载以下两个包（版本必须一致，推荐 4.7.0）：
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// - OpenCvSharp4 → 取出 OpenCvSharp.dll
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// - OpenCvSharp4.runtime.win → 取出 OpenCvSharpExtern.dll
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// (在 nupkg 解压后的 runtimes/win-x64/native/ 目录下)
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// - itextsharp 5.5.x → 取出 itextsharp.dll
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//
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// 2. 把这三个文件都放到同一个目录，例如：
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// D:\UserFiles\Documents\Quicker\_packages\OpenCvSharp\4.7.0\
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//
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// 3. Quicker "引用DLL库"栏填写（每行一个完整路径）：
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// D:\...\OpenCvSharp.dll
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// D:\...\itextsharp.dll
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// （OpenCvSharpExtern.dll 不填，代码会自动从同目录加载）
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//
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// 4. 不需要引用 OpenCvSharp.Extensions.dll
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//css_reference OpenCvSharp.dll;
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//css_reference itextsharp.dll;
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using OpenCvSharp;
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using iTextSharp.text;
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using iTextSharp.text.pdf;
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/// <summary>
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/// 文档扫描处理核心 - 全自动流水线
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/// 透视矫正 → 倾斜校正 → 图像增强，一步到位
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/// </summary>
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public static class DocumentScanner
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{
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/// <summary>
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/// 主处理入口：对单张图像执行完整扫描增强流水线
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/// </summary>
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public static Mat ProcessImage(Mat src)
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{
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Mat result = src.Clone();
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// 第1步：文档边缘检测 + 透视矫正
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result = DetectAndCorrectPerspective(result);
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// 第2步：倾斜校正
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result = Deskew(result);
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// 第3步：图像增强（Magic Color效果）
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result = EnhanceDocument(result);
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return result;
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}
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// ==========================================
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// 第1步：文档边缘检测 + 透视矫正 + 自动裁边
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// ==========================================
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private static Mat DetectAndCorrectPerspective(Mat src)
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{
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int origW = src.Width;
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int origH = src.Height;
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// 缩小图像加速边缘检测
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double scale = 1.0;
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Mat resized = src.Clone();
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if (Math.Max(origW, origH) > 1000)
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{
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scale = 1000.0 / Math.Max(origW, origH);
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resized = new Mat();
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Cv2.Resize(src, resized, new OpenCvSharp.Size(0, 0), scale, scale);
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}
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// 灰度 + 模糊
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Mat gray = new Mat();
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Cv2.CvtColor(resized, gray, ColorConversionCodes.BGR2GRAY);
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Cv2.GaussianBlur(gray, gray, new OpenCvSharp.Size(5, 5), 0);
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// 多策略边缘检测：先用宽松阈值，再用严格阈值
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OpenCvSharp.Point[] docContour = null;
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double imgArea = resized.Width * resized.Height;
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int[][] cannyParams = new int[][] {
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new int[] { 30, 120 }, // 宽松
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new int[] { 50, 200 }, // 中等
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new int[] { 75, 250 } // 严格
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};
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for (int p = 0; p < cannyParams.Length && docContour == null; p++)
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{
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Mat edged = new Mat();
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Cv2.Canny(gray, edged, cannyParams[p][0], cannyParams[p][1]);
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// 膨胀 + 闭运算，使边缘更连续
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Mat k1 = Cv2.GetStructuringElement(MorphShapes.Rect, new OpenCvSharp.Size(5, 5));
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Cv2.Dilate(edged, edged, k1);
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Mat k2 = Cv2.GetStructuringElement(MorphShapes.Rect, new OpenCvSharp.Size(7, 7));
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Cv2.MorphologyEx(edged, edged, MorphTypes.Close, k2);
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OpenCvSharp.Point[][] contours;
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HierarchyIndex[] hierarchy;
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Cv2.FindContours(edged, out contours, out hierarchy,
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RetrievalModes.List, ContourApproximationModes.ApproxSimple);
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// 按面积降序
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Array.Sort(contours, delegate(OpenCvSharp.Point[] a, OpenCvSharp.Point[] b) {
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return Cv2.ContourArea(b).CompareTo(Cv2.ContourArea(a));
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});
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for (int i = 0; i < Math.Min(contours.Length, 15); i++)
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{
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double area = Cv2.ContourArea(contours[i]);
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if (area < imgArea * 0.05) break; // 降低到5%
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double peri = Cv2.ArcLength(contours[i], true);
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OpenCvSharp.Point[] approx = Cv2.ApproxPolyDP(contours[i], 0.02 * peri, true);
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if (approx.Length == 4 && Cv2.IsContourConvex(approx))
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{
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docContour = approx;
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break;
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}
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}
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edged.Dispose();
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k1.Dispose();
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k2.Dispose();
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}
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// 回退策略：如果没找到四边形，尝试用最大轮廓的最小外接矩形
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if (docContour == null)
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{
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Mat edged2 = new Mat();
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Cv2.Canny(gray, edged2, 30, 100);
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Mat kd = Cv2.GetStructuringElement(MorphShapes.Rect, new OpenCvSharp.Size(9, 9));
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Cv2.Dilate(edged2, edged2, kd);
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Cv2.MorphologyEx(edged2, edged2, MorphTypes.Close, kd);
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OpenCvSharp.Point[][] contours2;
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HierarchyIndex[] hierarchy2;
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Cv2.FindContours(edged2, out contours2, out hierarchy2,
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RetrievalModes.External, ContourApproximationModes.ApproxSimple);
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double maxArea = 0;
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int maxIdx = -1;
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for (int i = 0; i < contours2.Length; i++)
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{
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double a = Cv2.ContourArea(contours2[i]);
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if (a > maxArea) { maxArea = a; maxIdx = i; }
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}
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if (maxIdx >= 0 && maxArea > imgArea * 0.05)
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{
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RotatedRect rr = Cv2.MinAreaRect(contours2[maxIdx]);
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Point2f[] pts = rr.Points();
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docContour = new OpenCvSharp.Point[4];
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for (int i = 0; i < 4; i++)
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{
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docContour[i] = new OpenCvSharp.Point((int)pts[i].X, (int)pts[i].Y);
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}
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}
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edged2.Dispose();
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kd.Dispose();
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}
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gray.Dispose();
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if (resized != src) resized.Dispose();
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if (docContour == null) return src; // 实在找不到，原样返回
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// 将坐标映射回原始尺寸
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Point2f[] srcPts = new Point2f[4];
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for (int i = 0; i < 4; i++)
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{
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srcPts[i] = new Point2f(
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(float)(docContour[i].X / scale),
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(float)(docContour[i].Y / scale));
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}
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// 对四个角点排序：左上、右上、右下、左下
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srcPts = OrderPoints(srcPts);
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// 计算目标矩形尺寸
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double widthTop = Distance(srcPts[0], srcPts[1]);
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double widthBot = Distance(srcPts[3], srcPts[2]);
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int maxW = (int)Math.Max(widthTop, widthBot);
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double heightLeft = Distance(srcPts[0], srcPts[3]);
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double heightRight = Distance(srcPts[1], srcPts[2]);
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int maxH = (int)Math.Max(heightLeft, heightRight);
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if (maxW < 100 || maxH < 100) return src; // 太小不处理
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Point2f[] dstPts = new Point2f[] {
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new Point2f(0, 0),
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new Point2f(maxW - 1, 0),
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new Point2f(maxW - 1, maxH - 1),
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new Point2f(0, maxH - 1)
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};
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Mat M = Cv2.GetPerspectiveTransform(srcPts, dstPts);
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Mat warped = new Mat();
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Cv2.WarpPerspective(src, warped, M, new OpenCvSharp.Size(maxW, maxH),
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InterpolationFlags.Linear, BorderTypes.Constant, Scalar.White);
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M.Dispose();
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src.Dispose();
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return warped;
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}
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/// <summary>
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/// 对四个点排序：左上、右上、右下、左下
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/// </summary>
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private static Point2f[] OrderPoints(Point2f[] pts)
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{
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// 按 x+y 排序找左上和右下
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Point2f[] sorted = new Point2f[4];
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List<Point2f> list = new List<Point2f>(pts);
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// 左上 = x+y 最小，右下 = x+y 最大
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list.Sort(delegate(Point2f a, Point2f b) {
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return (a.X + a.Y).CompareTo(b.X + b.Y);
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});
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sorted[0] = list[0]; // 左上
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sorted[2] = list[3]; // 右下
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// 右上 = x-y 最大，左下 = x-y 最小
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list.Sort(delegate(Point2f a, Point2f b) {
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return (a.X - a.Y).CompareTo(b.X - b.Y);
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});
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sorted[1] = list[3]; // 右上
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sorted[3] = list[0]; // 左下
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return sorted;
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}
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private static double Distance(Point2f a, Point2f b)
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{
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double dx = a.X - b.X;
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double dy = a.Y - b.Y;
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return Math.Sqrt(dx * dx + dy * dy);
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}
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// ==========================================
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// 第2步：倾斜校正（Deskew）
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// ==========================================
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private static Mat Deskew(Mat src)
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{
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Mat gray = new Mat();
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Cv2.CvtColor(src, gray, ColorConversionCodes.BGR2GRAY);
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// 二值化后检测边缘，比直接Canny更稳定
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Mat thresh = new Mat();
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Cv2.AdaptiveThreshold(gray, thresh, 255,
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AdaptiveThresholdTypes.GaussianC,
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ThresholdTypes.BinaryInv, 15, 5);
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Mat edges = new Mat();
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Cv2.Canny(thresh, edges, 50, 150, 3);
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thresh.Dispose();
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// 膨胀使文字行连成线段
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Mat dk = Cv2.GetStructuringElement(MorphShapes.Rect, new OpenCvSharp.Size(15, 1));
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Cv2.Dilate(edges, edges, dk);
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dk.Dispose();
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// 霍夫直线检测 — 降低阈值，缩短最小线段长度
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LineSegmentPoint[] lines = Cv2.HoughLinesP(edges, 1, Math.PI / 180.0,
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50, 50, 10);
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gray.Dispose();
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edges.Dispose();
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if (lines == null || lines.Length == 0) return src;
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// 收集所有线段角度，按线段长度加权
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List<double> angles = new List<double>();
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List<double> weights = new List<double>();
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for (int i = 0; i < lines.Length; i++)
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{
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double dx = lines[i].P2.X - lines[i].P1.X;
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double dy = lines[i].P2.Y - lines[i].P1.Y;
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double len = Math.Sqrt(dx * dx + dy * dy);
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double angle = Math.Atan2(dy, dx) * 180.0 / Math.PI;
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// 只关注接近水平的线（-30° ~ 30°）
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if (Math.Abs(angle) < 30)
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{
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angles.Add(angle);
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weights.Add(len);
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}
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}
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if (angles.Count == 0) return src;
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// 加权中位数：按长度排序后取加权中间位置
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// 简化：先按角度排序，取中位数
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angles.Sort();
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double medianAngle = angles[angles.Count / 2];
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// 降低阈值：只要 > 0.1° 就校正，上限放宽到 20°
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if (Math.Abs(medianAngle) < 0.1 || Math.Abs(medianAngle) > 20)
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return src;
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// 旋转校正
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Point2f center = new Point2f(src.Width / 2f, src.Height / 2f);
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Mat rotMat = Cv2.GetRotationMatrix2D(center, medianAngle, 1.0);
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Mat rotated = new Mat();
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Cv2.WarpAffine(src, rotated, rotMat, src.Size(),
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InterpolationFlags.Cubic, BorderTypes.Constant, Scalar.White);
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rotMat.Dispose();
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src.Dispose();
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return rotated;
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}
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// ==========================================
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// 第3步：图像增强
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// 减法提取墨迹深度 → 非线性加深 → 锐化
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// ==========================================
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private static Mat EnhanceDocument(Mat src)
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{
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// --- a: 转灰度 ---
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Mat gray = new Mat();
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Cv2.CvtColor(src, gray, ColorConversionCodes.BGR2GRAY);
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// --- b: 背景估计 ---
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int blurSize = Math.Max(gray.Width, gray.Height) / 8;
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if (blurSize % 2 == 0) blurSize++;
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if (blurSize < 51) blurSize = 51;
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Mat background = new Mat();
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Cv2.GaussianBlur(gray, background, new OpenCvSharp.Size(blurSize, blurSize), 0);
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// --- c: 减法提取墨迹 + 非线性加深 ---
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int w = gray.Width;
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int h = gray.Height;
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byte[] grayData = new byte[w * h];
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byte[] bgData = new byte[w * h];
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byte[] resultData = new byte[w * h];
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Marshal.Copy(gray.Data, grayData, 0, grayData.Length);
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Marshal.Copy(background.Data, bgData, 0, bgData.Length);
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background.Dispose();
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// 用百分位数而非最大值来计算增益（排除极端值）
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// 先收集所有正墨迹值
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int[] inkHist = new int[256];
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for (int i = 0; i < grayData.Length; i++)
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{
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int ink = bgData[i] - grayData[i];
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if (ink < 0) ink = 0;
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if (ink > 255) ink = 255;
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inkHist[ink]++;
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}
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// 找 95 百分位数作为参考墨迹深度
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int totalPixels = w * h;
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int target95 = (int)(totalPixels * 0.95);
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int cumulative = 0;
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int ink95 = 10;
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for (int i = 0; i < 256; i++)
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{
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cumulative += inkHist[i];
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if (cumulative >= target95)
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{
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ink95 = Math.Max(i, 5);
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break;
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}
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}
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// 计算"正常纸面亮度"：取灰度图中心区域的均值
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int cx1 = w / 4;
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int cx2 = w * 3 / 4;
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int cy1 = h / 4;
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int cy2 = h * 3 / 4;
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long centerSum = 0;
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int centerCount = 0;
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for (int y = cy1; y < cy2; y++)
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{
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for (int x = cx1; x < cx2; x++)
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{
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centerSum += grayData[y * w + x];
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centerCount++;
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}
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}
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int paperBright = (int)(centerSum / Math.Max(centerCount, 1));
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// 墨迹映射（带折痕/阴影抑制）
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//
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// 核心区分逻辑：文字 vs 折痕/阴影
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// 文字 = 高频信号，笔画边缘锐利，局部灰度变化剧烈
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// 折痕/阴影 = 低频信号，缓慢渐变，局部灰度变化平缓
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//
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// 方法：先正常生成墨迹图，然后用"墨迹图的局部方差"来区分
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// 高方差区域 = 文字（保留）
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// 低方差但偏暗区域 = 折痕/阴影（推向白色）
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// 先生成原始墨迹图（不做任何抑制）
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byte[] inkData = new byte[w * h];
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for (int i = 0; i < grayData.Length; i++)
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{
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int ink = bgData[i] - grayData[i];
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if (ink < 0) ink = 0;
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double inkNorm = (double)ink / ink95;
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if (inkNorm > 1.0) inkNorm = 1.0;
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double darkness = Math.Pow(inkNorm, 0.45);
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int val = (int)(255.0 * (1.0 - darkness));
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if (val < 0) val = 0;
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if (val > 255) val = 255;
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resultData[i] = (byte)val;
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inkData[i] = (byte)(255 - val); // 墨迹强度：0=无墨, 255=纯黑
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}
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// 计算局部方差图（用灰度图，不是墨迹图）
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// 文字区域：灰度变化大（笔画边缘），方差高
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// 折痕区域：灰度缓慢变化，方差低
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// 用简化方法：|gray - 局部均值| 的局部均值 ≈ 局部标准差
|
||
Mat grayMat = new Mat(h, w, MatType.CV_8U, grayData);
|
||
Mat localMean = new Mat();
|
||
int varKernSize = 15;
|
||
Cv2.Blur(grayMat, localMean, new OpenCvSharp.Size(varKernSize, varKernSize));
|
||
|
||
// |gray - localMean|
|
||
Mat diff = new Mat();
|
||
Cv2.Absdiff(grayMat, localMean, diff);
|
||
localMean.Dispose();
|
||
|
||
// 对 diff 再做一次均值模糊，得到局部方差的近似
|
||
Mat localVar = new Mat();
|
||
Cv2.Blur(diff, localVar, new OpenCvSharp.Size(varKernSize, varKernSize));
|
||
diff.Dispose();
|
||
grayMat.Dispose();
|
||
|
||
byte[] varData = new byte[w * h];
|
||
Marshal.Copy(localVar.Data, varData, 0, varData.Length);
|
||
localVar.Dispose();
|
||
|
||
// 用局部方差来决定是否抑制
|
||
// 高方差（> 阈值）= 文字，保留
|
||
// 低方差 + 有墨迹 = 折痕/阴影，抑制
|
||
int varThresh = 8; // 方差阈值，低于此值认为是平坦区域
|
||
|
||
for (int i = 0; i < resultData.Length; i++)
|
||
{
|
||
if (inkData[i] > 10 && varData[i] < varThresh)
|
||
{
|
||
// 有墨迹但局部方差低 → 折痕/阴影，推向白色
|
||
// 抑制程度和方差成正比：方差越低抑制越强
|
||
double suppressRatio = (double)varData[i] / varThresh;
|
||
int origVal = resultData[i];
|
||
resultData[i] = (byte)(origVal + (int)((255 - origVal) * (1.0 - suppressRatio)));
|
||
}
|
||
}
|
||
|
||
// --- 边缘阴影修复：从边缘向内扫描连续暗像素 ---
|
||
byte[] shadowFlag = new byte[w * h];
|
||
int darkThresh = (int)(paperBright * 0.55);
|
||
int maxScanDepth = Math.Max(w, h) / 8;
|
||
|
||
// 上边缘
|
||
for (int x = 0; x < w; x++)
|
||
{
|
||
for (int y = 0; y < Math.Min(maxScanDepth, h); y++)
|
||
{
|
||
if (grayData[y * w + x] < darkThresh)
|
||
shadowFlag[y * w + x] = 1;
|
||
else
|
||
break; // 遇到亮像素就停止
|
||
}
|
||
}
|
||
// 下边缘
|
||
for (int x = 0; x < w; x++)
|
||
{
|
||
for (int y = h - 1; y >= Math.Max(0, h - maxScanDepth); y--)
|
||
{
|
||
if (grayData[y * w + x] < darkThresh)
|
||
shadowFlag[y * w + x] = 1;
|
||
else
|
||
break;
|
||
}
|
||
}
|
||
// 左边缘
|
||
for (int y = 0; y < h; y++)
|
||
{
|
||
for (int x = 0; x < Math.Min(maxScanDepth, w); x++)
|
||
{
|
||
if (grayData[y * w + x] < darkThresh)
|
||
shadowFlag[y * w + x] = 1;
|
||
else
|
||
break;
|
||
}
|
||
}
|
||
// 右边缘
|
||
for (int y = 0; y < h; y++)
|
||
{
|
||
for (int x = w - 1; x >= Math.Max(0, w - maxScanDepth); x--)
|
||
{
|
||
if (grayData[y * w + x] < darkThresh)
|
||
shadowFlag[y * w + x] = 1;
|
||
else
|
||
break;
|
||
}
|
||
}
|
||
|
||
// 把阴影区域的结果设为白色
|
||
for (int i = 0; i < resultData.Length; i++)
|
||
{
|
||
if (shadowFlag[i] == 1)
|
||
resultData[i] = 255;
|
||
}
|
||
|
||
Mat enhanced = new Mat(h, w, MatType.CV_8U);
|
||
Marshal.Copy(resultData, 0, enhanced.Data, resultData.Length);
|
||
|
||
// --- d: USM锐化 ---
|
||
Mat blurred = new Mat();
|
||
Cv2.GaussianBlur(enhanced, blurred, new OpenCvSharp.Size(0, 0), 1.0);
|
||
Mat sharpened = new Mat();
|
||
Cv2.AddWeighted(enhanced, 1.8, blurred, -0.8, 0, sharpened);
|
||
blurred.Dispose();
|
||
enhanced.Dispose();
|
||
|
||
// --- e: 对比度加强 ---
|
||
Cv2.ConvertScaleAbs(sharpened, sharpened, 1.3, -20);
|
||
|
||
// --- f: 白底清理 ---
|
||
Cv2.Threshold(sharpened, sharpened, 220, 255, ThresholdTypes.Trunc);
|
||
Cv2.ConvertScaleAbs(sharpened, sharpened, 255.0 / 220.0, 0);
|
||
|
||
// 转回3通道
|
||
Mat output = new Mat();
|
||
Cv2.CvtColor(sharpened, output, ColorConversionCodes.GRAY2BGR);
|
||
|
||
gray.Dispose();
|
||
sharpened.Dispose();
|
||
src.Dispose();
|
||
|
||
return output;
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// PDF 读写工具类
|
||
/// </summary>
|
||
public static class PdfHelper
|
||
{
|
||
/// <summary>
|
||
/// 从PDF提取所有页面中的嵌入图像
|
||
/// </summary>
|
||
public static List<Bitmap> ExtractImagesFromPdf(string pdfPath)
|
||
{
|
||
List<Bitmap> images = new List<Bitmap>();
|
||
PdfReader reader = new PdfReader(pdfPath);
|
||
|
||
for (int pageNum = 1; pageNum <= reader.NumberOfPages; pageNum++)
|
||
{
|
||
PdfDictionary page = reader.GetPageN(pageNum);
|
||
PdfDictionary resources = page.GetAsDict(PdfName.RESOURCES);
|
||
if (resources == null) continue;
|
||
|
||
PdfDictionary xObjects = resources.GetAsDict(PdfName.XOBJECT);
|
||
if (xObjects == null) continue;
|
||
|
||
foreach (PdfName name in xObjects.Keys)
|
||
{
|
||
PdfObject obj = xObjects.Get(name);
|
||
if (!obj.IsIndirect()) continue;
|
||
|
||
PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
|
||
PdfName subtype = tg.GetAsName(PdfName.SUBTYPE);
|
||
if (!PdfName.IMAGE.Equals(subtype)) continue;
|
||
|
||
try
|
||
{
|
||
int xrefIdx = ((PRIndirectReference)obj).Number;
|
||
PdfObject pdfObj = reader.GetPdfObject(xrefIdx);
|
||
PdfStream stream = (PdfStream)pdfObj;
|
||
byte[] rawBytes = PdfReader.GetStreamBytesRaw((PRStream)stream);
|
||
|
||
PdfName filter = stream.GetAsName(PdfName.FILTER);
|
||
if (PdfName.DCTDECODE.Equals(filter))
|
||
{
|
||
// JPEG 直接解码
|
||
using (MemoryStream ms = new MemoryStream(rawBytes))
|
||
{
|
||
Bitmap bmp = new Bitmap(ms);
|
||
images.Add(new Bitmap(bmp));
|
||
}
|
||
}
|
||
else if (PdfName.FLATEDECODE.Equals(filter) || filter == null)
|
||
{
|
||
byte[] decoded = PdfReader.GetStreamBytes((PRStream)stream);
|
||
int width = tg.GetAsNumber(PdfName.WIDTH).IntValue;
|
||
int height = tg.GetAsNumber(PdfName.HEIGHT).IntValue;
|
||
int bpc = tg.GetAsNumber(PdfName.BITSPERCOMPONENT).IntValue;
|
||
PdfName cs = tg.GetAsName(PdfName.COLORSPACE);
|
||
|
||
Bitmap bmp = RawToBitmap(decoded, width, height, bpc, cs);
|
||
if (bmp != null) images.Add(bmp);
|
||
}
|
||
else
|
||
{
|
||
byte[] decoded = PdfReader.GetStreamBytes((PRStream)stream);
|
||
try
|
||
{
|
||
using (MemoryStream ms = new MemoryStream(decoded))
|
||
{
|
||
images.Add(new Bitmap(new Bitmap(ms)));
|
||
}
|
||
}
|
||
catch { }
|
||
}
|
||
}
|
||
catch { continue; }
|
||
}
|
||
}
|
||
reader.Close();
|
||
|
||
if (images.Count == 0)
|
||
{
|
||
throw new Exception("无法从PDF中提取图像。该PDF可能是纯文本或使用了不支持的编码。");
|
||
}
|
||
return images;
|
||
}
|
||
|
||
private static Bitmap RawToBitmap(byte[] data, int w, int h, int bpc, PdfName colorSpace)
|
||
{
|
||
if (bpc != 8) return null;
|
||
bool isRgb = PdfName.DEVICERGB.Equals(colorSpace);
|
||
bool isGray = PdfName.DEVICEGRAY.Equals(colorSpace);
|
||
|
||
if (isRgb && data.Length >= w * h * 3)
|
||
{
|
||
Bitmap bmp = new Bitmap(w, h, PixelFormat.Format24bppRgb);
|
||
BitmapData bd = bmp.LockBits(
|
||
new System.Drawing.Rectangle(0, 0, w, h),
|
||
ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
|
||
for (int y = 0; y < h; y++)
|
||
{
|
||
for (int x = 0; x < w; x++)
|
||
{
|
||
int si = (y * w + x) * 3;
|
||
int di = y * bd.Stride + x * 3;
|
||
Marshal.WriteByte(bd.Scan0, di, data[si + 2]);
|
||
Marshal.WriteByte(bd.Scan0, di + 1, data[si + 1]);
|
||
Marshal.WriteByte(bd.Scan0, di + 2, data[si]);
|
||
}
|
||
}
|
||
bmp.UnlockBits(bd);
|
||
return bmp;
|
||
}
|
||
else if (isGray && data.Length >= w * h)
|
||
{
|
||
Bitmap bmp = new Bitmap(w, h, PixelFormat.Format24bppRgb);
|
||
BitmapData bd = bmp.LockBits(
|
||
new System.Drawing.Rectangle(0, 0, w, h),
|
||
ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
|
||
for (int y = 0; y < h; y++)
|
||
{
|
||
for (int x = 0; x < w; x++)
|
||
{
|
||
byte g = data[y * w + x];
|
||
int di = y * bd.Stride + x * 3;
|
||
Marshal.WriteByte(bd.Scan0, di, g);
|
||
Marshal.WriteByte(bd.Scan0, di + 1, g);
|
||
Marshal.WriteByte(bd.Scan0, di + 2, g);
|
||
}
|
||
}
|
||
bmp.UnlockBits(bd);
|
||
return bmp;
|
||
}
|
||
return null;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 将多张图像保存为单个PDF
|
||
/// </summary>
|
||
public static void SaveImagesToPdf(List<Bitmap> images, string outputPath, int jpegQuality)
|
||
{
|
||
Document doc = null;
|
||
PdfWriter writer = null;
|
||
FileStream fs = null;
|
||
try
|
||
{
|
||
fs = new FileStream(outputPath, FileMode.Create);
|
||
Bitmap first = images[0];
|
||
doc = new Document(new iTextSharp.text.Rectangle(first.Width, first.Height), 0, 0, 0, 0);
|
||
writer = PdfWriter.GetInstance(doc, fs);
|
||
doc.Open();
|
||
|
||
for (int i = 0; i < images.Count; i++)
|
||
{
|
||
Bitmap bmp = images[i];
|
||
if (i > 0)
|
||
{
|
||
doc.SetPageSize(new iTextSharp.text.Rectangle(bmp.Width, bmp.Height));
|
||
doc.NewPage();
|
||
}
|
||
|
||
byte[] imgBytes;
|
||
using (MemoryStream ms = new MemoryStream())
|
||
{
|
||
EncoderParameters ep = new EncoderParameters(1);
|
||
ep.Param[0] = new EncoderParameter(
|
||
System.Drawing.Imaging.Encoder.Quality, (long)jpegQuality);
|
||
ImageCodecInfo codec = GetJpegCodec();
|
||
bmp.Save(ms, codec, ep);
|
||
imgBytes = ms.ToArray();
|
||
}
|
||
|
||
iTextSharp.text.Image pdfImg = iTextSharp.text.Image.GetInstance(imgBytes);
|
||
pdfImg.SetAbsolutePosition(0, 0);
|
||
pdfImg.ScaleAbsolute(bmp.Width, bmp.Height);
|
||
doc.Add(pdfImg);
|
||
}
|
||
}
|
||
finally
|
||
{
|
||
if (doc != null && doc.IsOpen()) doc.Close();
|
||
if (writer != null) writer.Close();
|
||
if (fs != null) fs.Close();
|
||
}
|
||
}
|
||
|
||
private static ImageCodecInfo GetJpegCodec()
|
||
{
|
||
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
|
||
for (int i = 0; i < codecs.Length; i++)
|
||
{
|
||
if (codecs[i].FormatID == ImageFormat.Jpeg.Guid) return codecs[i];
|
||
}
|
||
return null;
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// 简化版界面 - 一键处理，无需选模式
|
||
/// </summary>
|
||
public class ScannerForm : Form
|
||
{
|
||
private ListBox lstFiles;
|
||
private Button btnAddImages, btnAddPdf, btnRemove, btnClear;
|
||
private Button btnMoveUp, btnMoveDown, btnProcess;
|
||
private NumericUpDown nudQuality;
|
||
private ProgressBar progressBar;
|
||
private Label lblStatus;
|
||
private PictureBox picPreview;
|
||
|
||
private List<string> inputFiles = new List<string>();
|
||
private bool isPdfInput = false;
|
||
|
||
public ScannerForm()
|
||
{
|
||
InitUI();
|
||
}
|
||
|
||
private void InitUI()
|
||
{
|
||
this.Text = "文档扫描增强工具 v2";
|
||
this.Size = new System.Drawing.Size(720, 600);
|
||
this.StartPosition = FormStartPosition.CenterScreen;
|
||
this.FormBorderStyle = FormBorderStyle.FixedDialog;
|
||
this.MaximizeBox = false;
|
||
this.BackColor = System.Drawing.Color.FromArgb(245, 245, 250);
|
||
|
||
// 文件列表标题
|
||
Label lblFiles = new Label();
|
||
lblFiles.Text = "输入文件：";
|
||
lblFiles.Location = new System.Drawing.Point(15, 12);
|
||
lblFiles.AutoSize = true;
|
||
lblFiles.Font = new System.Drawing.Font("微软雅黑", 9f, System.Drawing.FontStyle.Bold);
|
||
this.Controls.Add(lblFiles);
|
||
|
||
// 文件列表
|
||
lstFiles = new ListBox();
|
||
lstFiles.Location = new System.Drawing.Point(15, 35);
|
||
lstFiles.Size = new System.Drawing.Size(460, 180);
|
||
lstFiles.Font = new System.Drawing.Font("Consolas", 9f);
|
||
lstFiles.HorizontalScrollbar = true;
|
||
lstFiles.SelectedIndexChanged += delegate(object s, EventArgs ev) {
|
||
int idx = lstFiles.SelectedIndex;
|
||
if (idx >= 0 && idx < inputFiles.Count && !isPdfInput)
|
||
{
|
||
try
|
||
{
|
||
if (picPreview.Image != null) picPreview.Image.Dispose();
|
||
picPreview.Image = new Bitmap(inputFiles[idx]);
|
||
}
|
||
catch { }
|
||
}
|
||
};
|
||
this.Controls.Add(lstFiles);
|
||
|
||
// 右侧按钮
|
||
int bx = 490;
|
||
int bw = 100;
|
||
|
||
btnAddImages = new Button();
|
||
btnAddImages.Text = "添加图片";
|
||
btnAddImages.Location = new System.Drawing.Point(bx, 35);
|
||
btnAddImages.Size = new System.Drawing.Size(bw, 32);
|
||
btnAddImages.Click += BtnAddImages_Click;
|
||
this.Controls.Add(btnAddImages);
|
||
|
||
btnAddPdf = new Button();
|
||
btnAddPdf.Text = "选择PDF";
|
||
btnAddPdf.Location = new System.Drawing.Point(bx + 110, 35);
|
||
btnAddPdf.Size = new System.Drawing.Size(bw, 32);
|
||
btnAddPdf.Click += BtnAddPdf_Click;
|
||
this.Controls.Add(btnAddPdf);
|
||
|
||
btnRemove = new Button();
|
||
btnRemove.Text = "移除选中";
|
||
btnRemove.Location = new System.Drawing.Point(bx, 75);
|
||
btnRemove.Size = new System.Drawing.Size(bw, 32);
|
||
btnRemove.Click += delegate {
|
||
if (lstFiles.SelectedIndex >= 0)
|
||
{
|
||
int idx = lstFiles.SelectedIndex;
|
||
inputFiles.RemoveAt(idx);
|
||
lstFiles.Items.RemoveAt(idx);
|
||
if (inputFiles.Count == 0) isPdfInput = false;
|
||
}
|
||
};
|
||
this.Controls.Add(btnRemove);
|
||
|
||
btnClear = new Button();
|
||
btnClear.Text = "清空列表";
|
||
btnClear.Location = new System.Drawing.Point(bx + 110, 75);
|
||
btnClear.Size = new System.Drawing.Size(bw, 32);
|
||
btnClear.Click += delegate {
|
||
inputFiles.Clear();
|
||
lstFiles.Items.Clear();
|
||
isPdfInput = false;
|
||
if (picPreview.Image != null) picPreview.Image.Dispose();
|
||
picPreview.Image = null;
|
||
lblStatus.Text = "已清空";
|
||
};
|
||
this.Controls.Add(btnClear);
|
||
|
||
btnMoveUp = new Button();
|
||
btnMoveUp.Text = "↑ 上移";
|
||
btnMoveUp.Location = new System.Drawing.Point(bx, 115);
|
||
btnMoveUp.Size = new System.Drawing.Size(bw, 32);
|
||
btnMoveUp.Click += delegate {
|
||
int idx = lstFiles.SelectedIndex;
|
||
if (idx > 0) SwapItems(idx, idx - 1);
|
||
};
|
||
this.Controls.Add(btnMoveUp);
|
||
|
||
btnMoveDown = new Button();
|
||
btnMoveDown.Text = "↓ 下移";
|
||
btnMoveDown.Location = new System.Drawing.Point(bx + 110, 115);
|
||
btnMoveDown.Size = new System.Drawing.Size(bw, 32);
|
||
btnMoveDown.Click += delegate {
|
||
int idx = lstFiles.SelectedIndex;
|
||
if (idx >= 0 && idx < lstFiles.Items.Count - 1) SwapItems(idx, idx + 1);
|
||
};
|
||
this.Controls.Add(btnMoveDown);
|
||
|
||
// JPEG质量
|
||
GroupBox grp = new GroupBox();
|
||
grp.Text = "输出设置";
|
||
grp.Location = new System.Drawing.Point(15, 222);
|
||
grp.Size = new System.Drawing.Size(685, 55);
|
||
grp.Font = new System.Drawing.Font("微软雅黑", 9f);
|
||
this.Controls.Add(grp);
|
||
|
||
Label lblQ = new Label();
|
||
lblQ.Text = "PDF图像质量：";
|
||
lblQ.Location = new System.Drawing.Point(15, 23);
|
||
lblQ.AutoSize = true;
|
||
grp.Controls.Add(lblQ);
|
||
|
||
nudQuality = new NumericUpDown();
|
||
nudQuality.Location = new System.Drawing.Point(110, 20);
|
||
nudQuality.Size = new System.Drawing.Size(60, 25);
|
||
nudQuality.Minimum = 50;
|
||
nudQuality.Maximum = 100;
|
||
nudQuality.Value = 92;
|
||
grp.Controls.Add(nudQuality);
|
||
|
||
Label lblQH = new Label();
|
||
lblQH.Text = "（自动执行：透视矫正 → 倾斜校正 → 增强美化，一步到位）";
|
||
lblQH.Location = new System.Drawing.Point(180, 23);
|
||
lblQH.AutoSize = true;
|
||
lblQH.ForeColor = System.Drawing.Color.FromArgb(100, 100, 100);
|
||
lblQH.Font = new System.Drawing.Font("微软雅黑", 8f);
|
||
grp.Controls.Add(lblQH);
|
||
|
||
// 预览
|
||
Label lblPrev = new Label();
|
||
lblPrev.Text = "预览：";
|
||
lblPrev.Location = new System.Drawing.Point(15, 285);
|
||
lblPrev.AutoSize = true;
|
||
lblPrev.Font = new System.Drawing.Font("微软雅黑", 9f, System.Drawing.FontStyle.Bold);
|
||
this.Controls.Add(lblPrev);
|
||
|
||
picPreview = new PictureBox();
|
||
picPreview.Location = new System.Drawing.Point(15, 308);
|
||
picPreview.Size = new System.Drawing.Size(685, 190);
|
||
picPreview.SizeMode = PictureBoxSizeMode.Zoom;
|
||
picPreview.BorderStyle = BorderStyle.FixedSingle;
|
||
picPreview.BackColor = System.Drawing.Color.White;
|
||
this.Controls.Add(picPreview);
|
||
|
||
// 底部
|
||
progressBar = new ProgressBar();
|
||
progressBar.Location = new System.Drawing.Point(15, 510);
|
||
progressBar.Size = new System.Drawing.Size(480, 25);
|
||
this.Controls.Add(progressBar);
|
||
|
||
lblStatus = new Label();
|
||
lblStatus.Text = "就绪 - 添加文件后点击处理";
|
||
lblStatus.Location = new System.Drawing.Point(15, 538);
|
||
lblStatus.Size = new System.Drawing.Size(480, 20);
|
||
lblStatus.ForeColor = System.Drawing.Color.DarkGray;
|
||
this.Controls.Add(lblStatus);
|
||
|
||
btnProcess = new Button();
|
||
btnProcess.Text = "一键处理并导出PDF";
|
||
btnProcess.Location = new System.Drawing.Point(510, 508);
|
||
btnProcess.Size = new System.Drawing.Size(190, 35);
|
||
btnProcess.Font = new System.Drawing.Font("微软雅黑", 10f, System.Drawing.FontStyle.Bold);
|
||
btnProcess.BackColor = System.Drawing.Color.FromArgb(0, 120, 215);
|
||
btnProcess.ForeColor = System.Drawing.Color.White;
|
||
btnProcess.FlatStyle = FlatStyle.Flat;
|
||
btnProcess.Click += BtnProcess_Click;
|
||
this.Controls.Add(btnProcess);
|
||
}
|
||
|
||
private void SwapItems(int a, int b)
|
||
{
|
||
string tf = inputFiles[a];
|
||
inputFiles[a] = inputFiles[b];
|
||
inputFiles[b] = tf;
|
||
object ti = lstFiles.Items[a];
|
||
lstFiles.Items[a] = lstFiles.Items[b];
|
||
lstFiles.Items[b] = ti;
|
||
lstFiles.SelectedIndex = b;
|
||
}
|
||
|
||
private void BtnAddImages_Click(object sender, EventArgs e)
|
||
{
|
||
if (isPdfInput)
|
||
{
|
||
MessageBox.Show("已选择PDF，请先清空列表。", "提示");
|
||
return;
|
||
}
|
||
OpenFileDialog ofd = new OpenFileDialog();
|
||
ofd.Title = "选择图片";
|
||
ofd.Filter = "图片|*.jpg;*.jpeg;*.png;*.bmp;*.tiff;*.tif;*.gif|所有文件|*.*";
|
||
ofd.Multiselect = true;
|
||
if (ofd.ShowDialog() == DialogResult.OK)
|
||
{
|
||
foreach (string f in ofd.FileNames)
|
||
{
|
||
if (!inputFiles.Contains(f))
|
||
{
|
||
inputFiles.Add(f);
|
||
lstFiles.Items.Add(Path.GetFileName(f));
|
||
}
|
||
}
|
||
lblStatus.Text = string.Format("共 {0} 个文件", inputFiles.Count);
|
||
}
|
||
}
|
||
|
||
private void BtnAddPdf_Click(object sender, EventArgs e)
|
||
{
|
||
if (inputFiles.Count > 0 && !isPdfInput)
|
||
{
|
||
MessageBox.Show("已添加图片，请先清空列表。", "提示");
|
||
return;
|
||
}
|
||
OpenFileDialog ofd = new OpenFileDialog();
|
||
ofd.Title = "选择PDF";
|
||
ofd.Filter = "PDF|*.pdf";
|
||
if (ofd.ShowDialog() == DialogResult.OK)
|
||
{
|
||
inputFiles.Clear();
|
||
lstFiles.Items.Clear();
|
||
inputFiles.Add(ofd.FileName);
|
||
lstFiles.Items.Add(Path.GetFileName(ofd.FileName));
|
||
isPdfInput = true;
|
||
lblStatus.Text = string.Format("已选择: {0}", Path.GetFileName(ofd.FileName));
|
||
}
|
||
}
|
||
|
||
private void BtnProcess_Click(object sender, EventArgs e)
|
||
{
|
||
if (inputFiles.Count == 0)
|
||
{
|
||
MessageBox.Show("请先添加文件！", "提示");
|
||
return;
|
||
}
|
||
|
||
SaveFileDialog sfd = new SaveFileDialog();
|
||
sfd.Title = "保存处理后的PDF";
|
||
sfd.Filter = "PDF|*.pdf";
|
||
sfd.FileName = "scanned_output.pdf";
|
||
if (sfd.ShowDialog() != DialogResult.OK) return;
|
||
|
||
string outputPath = sfd.FileName;
|
||
int quality = (int)nudQuality.Value;
|
||
SetUI(false);
|
||
|
||
try
|
||
{
|
||
// 加载源图像
|
||
List<Bitmap> sourceImages = new List<Bitmap>();
|
||
if (isPdfInput)
|
||
{
|
||
lblStatus.Text = "正在从PDF提取图像...";
|
||
Application.DoEvents();
|
||
sourceImages = PdfHelper.ExtractImagesFromPdf(inputFiles[0]);
|
||
}
|
||
else
|
||
{
|
||
for (int i = 0; i < inputFiles.Count; i++)
|
||
{
|
||
lblStatus.Text = string.Format("加载 {0}/{1}...", i + 1, inputFiles.Count);
|
||
Application.DoEvents();
|
||
sourceImages.Add(new Bitmap(inputFiles[i]));
|
||
}
|
||
}
|
||
|
||
progressBar.Maximum = sourceImages.Count;
|
||
progressBar.Value = 0;
|
||
|
||
// 逐张处理
|
||
List<Bitmap> results = new List<Bitmap>();
|
||
for (int i = 0; i < sourceImages.Count; i++)
|
||
{
|
||
lblStatus.Text = string.Format("处理第 {0}/{1} 页（矫正+增强）...", i + 1, sourceImages.Count);
|
||
Application.DoEvents();
|
||
|
||
// Bitmap → 内存PNG → Mat → 处理 → Mat → 内存PNG → Bitmap
|
||
Mat mat = BitmapToMat(sourceImages[i]);
|
||
Mat processed = DocumentScanner.ProcessImage(mat);
|
||
Bitmap resultBmp = MatToBitmap(processed);
|
||
results.Add(resultBmp);
|
||
|
||
// 预览
|
||
if (picPreview.Image != null) picPreview.Image.Dispose();
|
||
picPreview.Image = new Bitmap(resultBmp,
|
||
new System.Drawing.Size(picPreview.Width, picPreview.Height));
|
||
Application.DoEvents();
|
||
|
||
mat.Dispose();
|
||
processed.Dispose();
|
||
progressBar.Value = i + 1;
|
||
}
|
||
|
||
// 生成PDF
|
||
lblStatus.Text = "正在生成PDF...";
|
||
Application.DoEvents();
|
||
PdfHelper.SaveImagesToPdf(results, outputPath, quality);
|
||
|
||
// 清理
|
||
foreach (Bitmap b in sourceImages) b.Dispose();
|
||
foreach (Bitmap b in results) b.Dispose();
|
||
|
||
lblStatus.Text = string.Format("完成！已保存: {0}", Path.GetFileName(outputPath));
|
||
|
||
DialogResult dr = MessageBox.Show(
|
||
string.Format("处理完成！共 {0} 页。\n\n是否打开所在目录？", results.Count),
|
||
"完成", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
|
||
if (dr == DialogResult.Yes)
|
||
{
|
||
System.Diagnostics.Process.Start("explorer.exe", "/select," + outputPath);
|
||
}
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
MessageBox.Show("出错: " + ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
|
||
lblStatus.Text = "失败: " + ex.Message;
|
||
}
|
||
finally
|
||
{
|
||
SetUI(true);
|
||
}
|
||
}
|
||
|
||
private void SetUI(bool enabled)
|
||
{
|
||
btnAddImages.Enabled = enabled;
|
||
btnAddPdf.Enabled = enabled;
|
||
btnRemove.Enabled = enabled;
|
||
btnClear.Enabled = enabled;
|
||
btnMoveUp.Enabled = enabled;
|
||
btnMoveDown.Enabled = enabled;
|
||
btnProcess.Enabled = enabled;
|
||
}
|
||
|
||
/// <summary>
|
||
/// Bitmap → Mat（通过内存PNG中转，绕开 System.Drawing.Common 类型冲突）
|
||
/// </summary>
|
||
private static Mat BitmapToMat(Bitmap bmp)
|
||
{
|
||
using (MemoryStream ms = new MemoryStream())
|
||
{
|
||
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
|
||
byte[] buf = ms.ToArray();
|
||
return Cv2.ImDecode(buf, ImreadModes.Color);
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Mat → Bitmap（通过内存PNG中转）
|
||
/// </summary>
|
||
private static Bitmap MatToBitmap(Mat mat)
|
||
{
|
||
byte[] buf;
|
||
Cv2.ImEncode(".png", mat, out buf);
|
||
using (MemoryStream ms = new MemoryStream(buf))
|
||
{
|
||
return new Bitmap(ms);
|
||
}
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Quicker 入口 - 运行线程选择: 后台线程(STA)
|
||
/// </summary>
|
||
public static void Exec(Quicker.Public.IStepContext context)
|
||
{
|
||
// 在调用任何 OpenCvSharp 方法之前，手动加载原生 DLL
|
||
// 从 OpenCvSharp.dll 所在目录查找 OpenCvSharpExtern.dll
|
||
try
|
||
{
|
||
string asmPath = typeof(Cv2).Assembly.Location;
|
||
string asmDir = Path.GetDirectoryName(asmPath);
|
||
string externPath = Path.Combine(asmDir, "OpenCvSharpExtern.dll");
|
||
|
||
if (File.Exists(externPath))
|
||
{
|
||
LoadLibrary(externPath);
|
||
}
|
||
else
|
||
{
|
||
// 尝试 runtimes 子目录（NuGet 标准结构）
|
||
string runtimePath = Path.Combine(asmDir, "runtimes", "win-x64", "native", "OpenCvSharpExtern.dll");
|
||
if (File.Exists(runtimePath))
|
||
{
|
||
LoadLibrary(runtimePath);
|
||
}
|
||
}
|
||
}
|
||
catch { }
|
||
|
||
Application.EnableVisualStyles();
|
||
Application.SetCompatibleTextRenderingDefault(false);
|
||
Application.Run(new ScannerForm());
|
||
}
|
||
|
||
[DllImport("kernel32.dll", SetLastError = true)]
|
||
private static extern IntPtr LoadLibrary(string dllToLoad);
|