/// <summary>
/// foamliu, 2009/03/03, 边缘锐化.
/// 从原图像中减去拉普拉斯算子处理后的结果.
/// 我做的效果是图像锐化的同时产生了噪音. 与这个结果类似:
///
/// http://www.dfanning.com/ip_tips/sharpen.html
///
/// </summary>
/// <param name="bmp"></param>
/// <param name="type"></param>
/// <returns></returns>
public static Bitmap SharpenEdges(Bitmap bmp)
{
int width, height;
int[][][] mat, filtered = new int[3][][];
Bitmap newBmp;
ImageConvert.Bitmap2MatColor(bmp, out mat, out width, out height);
Convolution conv = new Convolution();
conv.Calculate(mat[0], ConvKernel.Laplacian_4, out filtered[0]);
conv.Calculate(mat[1], ConvKernel.Laplacian_4, out filtered[1]);
conv.Calculate(mat[2], ConvKernel.Laplacian_4, out filtered[2]);
NcvMatrix.MatSubtract(mat[0], filtered[0]);
NcvMatrix.MatSubtract(mat[1], filtered[1]);
NcvMatrix.MatSubtract(mat[2], filtered[2]);
GrayScaleImageLib.Normalize(mat[0]);
GrayScaleImageLib.Normalize(mat[1]);
GrayScaleImageLib.Normalize(mat[2]);
ImageConvert.Mat2BitmapColor(mat, width, height, out newBmp);
return(newBmp);
}
public static Bitmap SharpenMore(Bitmap bmp)
{
int width, height;
int[][] mat, filtered;
Bitmap newBmp;
ImageConvert.Bitmap2Mat(bmp, out mat, out width, out height);
Convolution conv = new Convolution();
conv.Calculate(mat, ConvKernel.Laplacian_8, out filtered);
NcvMatrix.MatSubtract(mat, filtered);
GrayScaleImageLib.Normalize(mat);
ImageConvert.Mat2Bitmap(mat, width, height, out newBmp);
return(newBmp);
}
