本文实例讲述了C#实现图像锐化的方法。分享给大家供大家参考。具体如下：
//定义图像锐化函数 private static Bitmap Sharpen(Bitmap a,double v) { int w = a.Width; int h = a.Height; try { Bitmap dstBitmap = new Bitmap(w, h, System.Drawing.Imaging.PixelFormat.Format24bppRgb); System.Drawing.Imaging.BitmapData srcData = a.LockBits(new Rectangle (0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); System.Drawing.Imaging.BitmapData dstData = dstBitmap.LockBits(new Rectangle (0, 0, w, h), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb); unsafe { byte* pIn = (byte*)srcData.Scan0.ToPointer(); byte* pOut = (byte*)dstData.Scan0.ToPointer(); byte* p; int stride = srcData.Stride; for (int y = 0; y < h; y++) { for (int x = 0; x < w; x++) { //边缘八个点像素不变 if (x == 0 || x == w - 1 || y == 0 || y == h - 1) { pOut[0] = pIn[0]; pOut[1] = pIn[1]; pOut[2] = pIn[2]; } else { int r0, r1, r2, r3, r4, r5, r6, r7, r8; int g1, g2, g3, g4, g5, g6, g7, g8, g0; int b1, b2, b3, b4, b5, b6, b7, b8, b0; double vR, vG, vB; //左上 p = pIn - stride - 3; r1 = p[2]; g1 = p[1]; b1 = p[0]; //正上 p = pIn - stride; r2 = p[2]; g2 = p[1]; b2 = p[0]; //右上 p = pIn - stride + 3; r3 = p[2]; g3 = p[1]; b3 = p[0]; //左 p = pIn - 3; r4 = p[2]; g4 = p[1]; b4 = p[0]; //右 p = pIn + 3; r5 = p[2]; g5 = p[1]; b5 = p[0]; //左下 p = pIn + stride - 3; r6 = p[2]; g6 = p[1]; b6 = p[0]; //正下 p = pIn + stride; r7 = p[2]; g7 = p[1]; b7 = p[0]; // 右下 p = pIn + stride + 3; r8 = p[2]; g8 = p[1]; b8 = p[0]; //中心点 p = pIn; r0 = p[2]; g0 = p[1]; b0 = p[0]; vR = (double)r0 - (double)(r1 + r2 + r3 + r4 + r5 + r6 + r7 + r8) / 8; vG = (double)g0 - (double)(g1 + g2 + g3 + g4 + g5 + g6 + g7 + g8) / 8; vB = (double)b0 - (double)(b1 + b2 + b3 + b4 + b5 + b6 + b7 + b8) / 8; vR = r0 + vR * v; vG = g0 + vG * v; vB = b0 + vB * v; if (vR > 0) { vR = Math.Min(255, vR); } else { vR = Math.Max(0, vR); } if (vG > 0) { vG = Math.Min(255, vG); } else { vG = Math.Max(0, vG); } if (vB > 0) { vB = Math.Min(255, vB); } else { vB = Math.Max(0, vB); } pOut[0] = (byte)vB; pOut[1] = (byte)vG; pOut[2] = (byte)vR; } pIn += 3; pOut += 3; } pIn += srcData.Stride - w * 3; pOut += srcData.Stride - w * 3; } } a.UnlockBits(srcData); dstBitmap.UnlockBits(dstData); return dstBitmap; } catch { return null; } }
希望本文所述对大家的C#程序设计有所帮助。
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