C#图像处理之图像均值方差计算的方法
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2022-05-26 15:18:44
本文实例讲述了c#图像处理之图像均值方差计算的方法。分享给大家供大家参考。具体如下:
//本函数均是基于rgb颜色空间计算
//定义图像均值函数(rgb空间)...
本文实例讲述了c#图像处理之图像均值方差计算的方法。分享给大家供大家参考。具体如下:
//本函数均是基于rgb颜色空间计算 //定义图像均值函数(rgb空间) public double anbitmap(bitmap a) { double v = 0; rectangle rect = new rectangle(0, 0, a.width, a.height); system.drawing.imaging.bitmapdata bmpdata = a.lockbits(rect, system.drawing.imaging.imagelockmode.readwrite, system.drawing.imaging.pixelformat.format24bpprgb); unsafe { byte* pin = (byte*)bmpdata.scan0.topointer(); byte* p; int r, g, b; double meanvalue = 0, sum = 0; int stride = bmpdata.stride; for (int y = 0; y < a.height; y++) { for (int x = 0; x < a.width; x++) { p = pin; b = p[0]; g = p[1]; r = p[2]; sum += b * 0.114 + g * 0.587 + r * 0.299; pin += 3; } pin += stride - a.width * 3; } meanvalue = sum / (a.width * a.height); v = meanvalue; } a.unlockbits(bmpdata); return v; //返回图像均值v } //定义图像统计方差函数(rgb空间) public double anconbitmap(bitmap a,double meanvalue) { double v = 0; rectangle rect = new rectangle(0, 0, a.width, a.height); system.drawing.imaging.bitmapdata bmpdata = a.lockbits(rect, system.drawing.imaging.imagelockmode.readwrite, system.drawing.imaging.pixelformat.format24bpprgb); unsafe { byte* pin = (byte*)bmpdata.scan0.topointer(); byte* p; int r, g, b; double conv = 0, sum = 0; int stride = bmpdata.stride; for (int y = 0; y < a.height; y++) { for (int x = 0; x < a.width; x++) { p = pin; b = p[0]; g = p[1]; r = p[2]; sum += (b * 0.114 + g * 0.587 + r * 0.299 - meanvalue) * (b * 0.114 + g * 0.587 + r * 0.299 - meanvalue); pin += 3; } pin += stride - a.width * 3; } conv = sum / (a.width * a.height-1); v = conv; } a.unlockbits(bmpdata); return v; //返回图像方差v }
希望本文所述对大家的c#程序设计有所帮助。