/// <summary> /// 计算最近正样本距离系数,按照距离而不是相关系数,这样效率高,系数越小,检测对象越接近目标 /// </summary> /// <param name="rect">检测目标区域</param> /// <param name="bmp">整幅位图</param> /// <returns>最近距离系数, double.MaxValue表示计算异常或没计算</returns> public double MinDistance(RectangleF rect, Bitmap bmp) { double mindistance = double.MaxValue; // 返回值 double dist = double.MaxValue; double minposdist = double.MaxValue; double minnegdist = double.MaxValue; if (rect == Rectangle.Empty) { return(mindistance); } DateTime dt = DateTime.Now; double elapse = 0; Bitmap patch = ImgOper.CutImage(bmp, (int)rect.X, (int)rect.Y, (int)rect.Width, (int)rect.Height); patch = ImgOper.ResizeImage(patch, Parameter.DETECT_WINDOW_SIZE.Width, Parameter.DETECT_WINDOW_SIZE.Height); patch = ImgOper.Grayscale(patch); int[,] patchgram = ImgOper.Integrogram(patch, 1); byte[] patchdata = ImgOper.GetGraybmpData(patch); double patchmean = (double)patchgram[patch.Height - 1, patch.Width - 1] / (double)(patch.Width * patch.Height); double[] patchdatad = new double[patchdata.Length]; for (int i = 0; i < patchdata.Length; i++) { patchdatad[i] = patchdata[i] - patchmean; } foreach (ValuedBitmap posbmp in PosMapCollection) { int[,] posgram = ImgOper.Integrogram(posbmp.VBitmap, 1); byte[] posdata = ImgOper.GetGraybmpData(posbmp.VBitmap); double posmean = (double)posgram[posbmp.VBitmap.Height - 1, posbmp.VBitmap.Width - 1] / (double)(posbmp.VBitmap.Width * posbmp.VBitmap.Height); double[] posdatad = new double[posdata.Length]; for (int i = 0; i < posdata.Length; i++) { posdatad[i] = posdata[i] - posmean; } dist = ImgStatCompute.ComputeDistance(patchdatad, posdatad); if (dist < minposdist) { minposdist = dist; } } foreach (ValuedBitmap negbmp in NegMapCollection) { int[,] neggram = ImgOper.Integrogram(negbmp.VBitmap, 1); byte[] negdata = ImgOper.GetGraybmpData(negbmp.VBitmap); double negmean = (double)neggram[negbmp.VBitmap.Height - 1, negbmp.VBitmap.Width - 1] / (double)(negbmp.VBitmap.Width * negbmp.VBitmap.Height); double[] negdatad = new double[negdata.Length]; for (int i = 0; i < negdata.Length; i++) { negdatad[i] = negdata[i] - negmean; } dist = ImgStatCompute.ComputeDistance(patchdatad, negdatad); if (dist < minnegdist) { minnegdist = dist; } } if (minnegdist != 0 || minposdist != 0) { // 带归一化的系数,如果用minposdist/minnegdist,值可能会溢出 mindistance = minposdist / (minposdist + minnegdist); } elapse = DateTime.Now.Subtract(dt).TotalMilliseconds; return(mindistance); }