/// <summary>
/// Creates a new image that will be used as a mask for the histogram calculation.
/// All forground points will be colored blue and all background points will be colored red.
/// </summary>
public static CVImage PrepareMask(CVImage image, Point[] forgroundPoints, Point[] backgroundPoints, bool includeNeautral, int floodFillThreshold)
{
CVImage outputImage = image.Clone();
outputImage.Zero();
FloodFillParams ffp = new FloodFillParams();
ffp.Frame = image;
ffp.Threshold = floodFillThreshold;
// fill all forground points in FG_COLOR
foreach (Point pt in forgroundPoints)
{
RegionGrowing.Fill(pt, outputImage, new RegionGrowingCriteria(FloodFill), ffp, new LabelingFunc(RegionGrowing.DefaultLabeling), FG_COLOR);
}
// fill all background points in BG_COLOR
foreach (Point pt in backgroundPoints)
{
RegionGrowing.Fill(pt, outputImage, new RegionGrowingCriteria(FloodFill), ffp, new LabelingFunc(RegionGrowing.DefaultLabeling), TEMP_BG_COLOR);
}
// now colorize to actual colors.
for (int row = 0; row < outputImage.Height; ++row)
{
for (int col = 0; col < outputImage.Width; ++col)
{
int argb = outputImage[row, col].ToColor().ToArgb();
if (includeNeautral)
{
if (argb == Color.Black.ToArgb())
{
outputImage[row, col] = new CVRgbPixel(NEAUTRAL_COLOR);
}
}
if (argb == TEMP_BG_COLOR.ToArgb())
{
outputImage[row, col] = new CVRgbPixel(BG_COLOR);
}
}
}
// return as a grayscale image.
CVImage grayscale = outputImage.ToGrayscale();
outputImage.Release();
return(grayscale);
}
/// <summary>
/// Handles the next video frame.
/// </summary>
private void HandleNextFrame()
{
if (capture == null)
{
return;
}
// release last frame.
if (lastFrame != null)
{
lastFrame.Release();
}
// query next frame.
lastFrame = capture.QueryFrame();
if (lastFrame == null)
{
if (loop)
{
capture.Restart();
lastFrame = capture.QueryFrame();
}
else
{
Pause();
return;
}
}
// put next frame to picture box, if defined.
if (pictureBox != null)
{
pictureBox.Image = lastFrame.ToBitmap();
}
// fire event.
if (NextFrame != null)
{
NextFrameEventArgs ea = new NextFrameEventArgs();
ea.Frame = lastFrame;
ea.Capture = capture;
NextFrame(this, ea);
}
}
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), colColor);
outputImage.DrawRectangle(new Rectangle(bin * binWidth, imageHeight - binHeight, binWidth - 1, binHeight), colMarker);
outputImage.DrawRectangle(new Rectangle(bin * binWidth, imageHeight - binHeight, 1, binHeight), colMarker);
}
window.Image = outputImage.ToBitmap();
outputImage.Release();
}
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();
}