///

/// 自動去除圖像掃描黑邊

///

///

public static void AutoCutBlackEdge(string fileName)

{

//打開圖像

Bitmap bmp = OpenImage(fileName);

RemoveBlackEdge(bmp);

//保存圖像

SaveImage(bmp, fileName);

}

private static byte[] rgbValues; // 目標數組內存

///

/// 圖像去黑邊

///

///

///

private static Bitmap RemoveBlackEdge(Bitmap bmp)

{

Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);

BitmapData bmpData = bmp.LockBits(rect, ImageLockMode.ReadWrite, bmp.PixelFormat);

// 獲取圖像參數

int w = bmpData.Width;

int h = bmpData.Height;

int stride = bmpData.Stride;? // 掃描線的寬度

double picByteSize = GetPicByteSize(bmp.PixelFormat);

int bWidth = (int)Math.Ceiling(picByteSize * w); //顯示寬度

int offset = stride - bWidth;? // 顯示寬度與掃描線寬度的間隙

IntPtr ptr = bmpData.Scan0;?? // 獲取bmpData的內存起始位置

int scanBytes = stride * h;? // 用stride寬度，表示這是內存區域的大小

// 分別設置兩個位置指針，指向源數組和目標數組

int posScan = 0;

rgbValues = new byte[scanBytes];? // 為目標數組分配內存

Marshal.Copy(ptr, rgbValues, 0, scanBytes);? // 將圖像數據拷貝到rgbValues中

bool isPass = true;

int i = 0, j = 0;

int cutW = (int)(bWidth * 0.02); //2%寬度(可修改)

int cutH = (int)(h * 0.02);????? //2%高度(可修改)

int posLen = (int)(picByteSize * 8); //繼續查找深度為8的倍數(可修改)

//左邊

for (i = 0; i < h; i++)

{

for (j = 0; j < bWidth; j++)

{

isPass = true;

if (rgbValues[posScan] < 255) rgbValues[posScan] = 255;

if (rgbValues[posScan + 1] == 255)

{

for (int m = 1; m <= posLen; m++)

{

if (rgbValues[posScan + m] < 255) isPass = false;

}

}

if (rgbValues[posScan + 1] < 255 || bWidth / 2 < j) isPass = false;

recCheck(ref rgbValues, posScan, h, stride, true);

posScan++;

if (j >= cutW && isPass) break;

}

// 跳過圖像數據每行未用空間的字節，length = stride - width * bytePerPixel

if (j == bWidth) posScan += offset;

else posScan += (offset + bWidth - j - 1);

}

//右邊

posScan = scanBytes - 1;

for (i = h - 1; i >= 0; i--)

{

posScan -= offset;

for (j = bWidth - 1; j >= 0; j--)

{

isPass = true;

if (rgbValues[posScan] < 255) rgbValues[posScan] = 255;

if (rgbValues[posScan - 1] == 255)

{

for (int m = 1; m <= posLen; m++)

{

if (rgbValues[posScan - m] < 255) isPass = false;

}

}

if (rgbValues[posScan - 1] < 255 || bWidth / 2 > j) isPass = false;

recCheck(ref rgbValues, posScan, h, stride, false);

posScan--;

if (cutH < (h - i))

if (j < (bWidth - cutW) && isPass) break;

}

// 跳過圖像數據每行未用空間的字節，length = stride - width * bytePerPixel

if (j != -1) posScan -= j;

}

// 內存解鎖

Marshal.Copy(rgbValues, 0, ptr, scanBytes);

bmp.UnlockBits(bmpData);? // 解鎖內存區域

return bmp;

}

///

/// 上下去除黑邊時，臨近黑點去除

///

///

///

///

///

///

private static void recCheck(ref byte[] rgbValues, int posScan, int h, int stride, bool islLeft)

{

int scanBytes = h * stride;

int cutH = (int)(h * 0.01); //臨近最大1%高度(可修改)

for (int i = 1; i <= cutH; i++)

{

int befRow = 0;

if (islLeft && (posScan - stride * i) > 0)

{

befRow = posScan - stride * i;

}

else if (!islLeft && (posScan + stride * i) < scanBytes)

{

befRow = posScan + stride * i;

}

if (rgbValues[befRow] < 255) rgbValues[befRow] = 255;

else break;

}

}

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