void DrawHistogram(PictureBox window, CVHistogram histo, int channelIdx) { int imageWidth = window.Width; int imageHeight = window.Height; int bins = histo.BinSizes[0]; int binWidth = imageWidth / bins; if (binWidth <= 0) binWidth = 1; CVPair minMax = histo.MinMaxValue; CVImage outputImage = new CVImage(imageWidth, imageHeight, CVDepth.Depth8U, 3); outputImage.Zero(); for (int bin = 0; bin < bins; bin++) { double binValue = histo[bin]; byte level = (byte)CVUtils.Round(binValue * 255 / minMax.Second); byte binHeight = (byte)CVUtils.Round(binValue * imageHeight / minMax.Second); byte[] color = new byte[3]; color[channelIdx] = (byte)(((double)bin / (double)bins) * 255); byte[] markerColor = new byte[3]; markerColor[channelIdx] = level; Color colColor = Color.FromArgb(color[2], color[1], color[0]); Color colMarker = Color.FromArgb(markerColor[2], markerColor[1], markerColor[0]); outputImage.DrawRectangle(new Rectangle(bin * binWidth, imageHeight - binHeight, binWidth - 1, binHeight), Color.White /* colColor */); outputImage.DrawRectangle(new Rectangle(bin * binWidth, imageHeight - binHeight, binWidth - 1, 1), colMarker); outputImage.DrawRectangle(new Rectangle(bin * binWidth, imageHeight - binHeight, 1, binHeight), colMarker); } window.Image = outputImage.ToBitmap(); outputImage.Release(); }