/// <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>
/// This callback is used in the call to RegionGrowing.Fill to perform
/// flood fill.
/// </summary>
private static bool FloodFill(Point pt1, Point pt2, object cookie)
{
FloodFillParams ffp = cookie as FloodFillParams;
return(RegionGrowing.FloodFillCondition(ffp.Frame, pt1, pt2, ffp.Threshold));
}