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增强边缘阴影扫描：容忍跳过5个亮像素、阈值65%、深度1/3

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之前遇到一个亮像素就停止，阴影中夹杂的稍亮像素会打断扫描。
改为允许跳过最多5个亮像素继续扫描，记录最后一个暗像素位置，
把从边缘到该位置的所有像素都设为白色。
阈值从60%提到65%，扫描深度从1/4加到1/3。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
尘曲
2026-03-20 08:46:39 +08:00
parent cf7e667733
commit 3db5e9f6f7
1 changed files with 51 additions and 10 deletions
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69
CamScanner.cs
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@@ -437,8 +437,9 @@ public static class DocumentScanner
} }
} }
int paperBright = (int)(centerSum / Math.Max(centerCount, 1)); int paperBright = (int)(centerSum / Math.Max(centerCount, 1));
int darkThresh = (int)(paperBright * 0.6); int darkThresh = (int)(paperBright * 0.65);
int maxScanDepth = Math.Max(w, h) / 4; // 最多扫描1/4深度 int maxScanDepth = Math.Max(w, h) / 3; // 最多扫描1/3深度
int tolerance = 5; // 允许跳过最多5个亮像素继续扫描
byte[] cleanedData = new byte[w * h]; byte[] cleanedData = new byte[w * h];
Marshal.Copy(cleaned.Data, cleanedData, 0, cleanedData.Length); Marshal.Copy(cleaned.Data, cleanedData, 0, cleanedData.Length);
@@ -446,46 +447,86 @@ public static class DocumentScanner
// 上边缘 // 上边缘
for (int x = 0; x < w; x++) for (int x = 0; x < w; x++)
{ {
int skipCount = 0;
int lastDark = -1;
for (int y = 0; y < Math.Min(maxScanDepth, h); y++) for (int y = 0; y < Math.Min(maxScanDepth, h); y++)
{ {
if (grayData[y * w + x] < darkThresh) if (grayData[y * w + x] < darkThresh)
cleanedData[y * w + x] = 255; {
else lastDark = y;
break; skipCount = 0;
} }
else
{
skipCount++;
if (skipCount > tolerance) break;
}
}
for (int y = 0; y <= lastDark; y++)
cleanedData[y * w + x] = 255;
} }
// 下边缘 // 下边缘
for (int x = 0; x < w; x++) for (int x = 0; x < w; x++)
{ {
int skipCount = 0;
int lastDark = h;
for (int y = h - 1; y >= Math.Max(0, h - maxScanDepth); y--) for (int y = h - 1; y >= Math.Max(0, h - maxScanDepth); y--)
{ {
if (grayData[y * w + x] < darkThresh) if (grayData[y * w + x] < darkThresh)
cleanedData[y * w + x] = 255; {
else lastDark = y;
break; skipCount = 0;
} }
else
{
skipCount++;
if (skipCount > tolerance) break;
}
}
for (int y = h - 1; y >= lastDark; y--)
cleanedData[y * w + x] = 255;
} }
// 左边缘 // 左边缘
for (int py = 0; py < h; py++) for (int py = 0; py < h; py++)
{ {
int skipCount = 0;
int lastDark = -1;
for (int x = 0; x < Math.Min(maxScanDepth, w); x++) for (int x = 0; x < Math.Min(maxScanDepth, w); x++)
{ {
if (grayData[py * w + x] < darkThresh) if (grayData[py * w + x] < darkThresh)
cleanedData[py * w + x] = 255; {
else lastDark = x;
break; skipCount = 0;
} }
else
{
skipCount++;
if (skipCount > tolerance) break;
}
}
for (int x = 0; x <= lastDark; x++)
cleanedData[py * w + x] = 255;
} }
// 右边缘 // 右边缘
for (int py = 0; py < h; py++) for (int py = 0; py < h; py++)
{ {
int skipCount = 0;
int lastDark = w;
for (int x = w - 1; x >= Math.Max(0, w - maxScanDepth); x--) for (int x = w - 1; x >= Math.Max(0, w - maxScanDepth); x--)
{ {
if (grayData[py * w + x] < darkThresh) if (grayData[py * w + x] < darkThresh)
cleanedData[py * w + x] = 255; {
else lastDark = x;
break; skipCount = 0;
} }
else
{
skipCount++;
if (skipCount > tolerance) break;
}
}
for (int x = w - 1; x >= lastDark; x--)
cleanedData[py * w + x] = 255;
} }
Marshal.Copy(cleanedData, 0, cleaned.Data, cleanedData.Length); Marshal.Copy(cleanedData, 0, cleaned.Data, cleanedData.Length);