扫描图片去黑边代码,CSharp代码库,德仔网

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【CSharp】扫描图片去黑边
作者:zhensoft163 / 发布于2014/4/10/ 598
扫描图片去黑边
/// <summary>
 /// 自动去除图像扫描黑边
 /// </summary>
 /// <param name="fileName"></param>
 public static void AutoCutBlackEdge(string fileName)
 {
 //打开图像
 Bitmap bmp = OpenImage(fileName);

 RemoveBlackEdge(bmp);
 //保存图像
 SaveImage(bmp, fileName);
 }

 private static byte[] rgbValues; // 目标数组内存

 /// <summary>
 /// 图像去黑边
 /// </summary>
 /// <param name="bmp"></param>
 /// <returns></returns>
 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);

 // 获取图像参数
 int w = bmpData.Width;
 int h = bmpData.Height;
 int stride = bmpData.Stride; // 扫描线的宽度
 double picByteSize = GetPicByteSize(bmp.PixelFormat);
 int bWidth = (int)Math.Ceiling(picByteSize * w); //显示宽度
 int offset = stride - bWidth; // 显示宽度与扫描线宽度的间隙
 IntPtr ptr = bmpData.Scan0; // 获取bmpData的内存起始位置
 int scanBytes = stride * h; // 用stride宽度，表示这是内存区域的大小

 // 分别设置两个位置指针，指向源数组和目标数组
 int posScan = 0;
 rgbValues = new byte[scanBytes]; // 为目标数组分配内存
 Marshal.Copy(ptr, rgbValues, 0, scanBytes); // 将图像数据拷贝到rgbValues中

 bool isPass = true;
 int i = 0, j = 0;
 int cutW = (int)(bWidth * 0.02); //2%宽度（可修改）
 int cutH = (int)(h * 0.02); //2%高度（可修改）
 int posLen = (int)(picByteSize * 8); //继续查找深度为8的倍数（可修改）
 //左边
 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;
 }
 // 跳过图像数据每行未用空间的字节，length = stride - width * bytePerPixel
 if (j == bWidth) posScan += offset;
 else posScan += (offset + bWidth - j - 1);
 }
 //右边
 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;
 }
 // 跳过图像数据每行未用空间的字节，length = stride - width * bytePerPixel
 if (j != -1) posScan -= j;
 }

 // 内存解锁
 Marshal.Copy(rgbValues, 0, ptr, scanBytes);
 bmp.UnlockBits(bmpData); // 解锁内存区域

 return bmp;
 }

 /// <summary>
 /// 上下去除黑边时，临近黑点去除
 /// </summary>
 /// <param name="rgbValues"></param>
 /// <param name="posScan"></param>
 /// <param name="h"></param>
 /// <param name="stride"></param>
 /// <param name="islLeft"></param>
 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); //临近最大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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