private static Tuple <Image <Bgr, byte>, Rectangle, double> btnCalcBackProjectPatch(Image <Gray, byte> model, Image <Gray, byte> observed, Image <Bgr, byte> result)
{
Stopwatch sw = new Stopwatch();
sw.Start();
Image <Bgr, Byte> imageSource = observed.Convert <Bgr, byte>();
double scale = GetScale();
Image <Bgr, Byte> imageSource2 = imageSource.Resize(scale, INTER.CV_INTER_LINEAR);
Image <Bgr, Byte> imageTarget = model.Convert <Bgr, byte>();
Image <Bgr, Byte> imageTarget2 = imageTarget.Resize(scale, INTER.CV_INTER_LINEAR);
Image <Gray, Single> imageDest = null;
int edgeX = imageTarget2.Size.Width;
int edgeY = imageTarget2.Size.Height;
Size patchSize = new Size(edgeX, edgeY);
string colorSpace = "Gray";
double normalizeFactor = 1d;
Image <Gray, Byte>[] imagesSource;
int[] bins;
RangeF[] ranges;
string[] captions;
Color[] colors;
// Get all the color bins from the source images.
GetImagesBinsAndRanges(imageSource2, colorSpace, out imagesSource, out bins, out ranges, out captions, out colors);
// Histogram calculation.
DenseHistogram histTarget = CalcHist(imageTarget2.Bitmap);
// Backproject compare method.
HISTOGRAM_COMP_METHOD compareMethod = GetHistogramCompareMethod();
imageDest = BackProjectPatch <Byte>(imagesSource, patchSize, histTarget, compareMethod, (float)normalizeFactor);
// Best-match value.
double bestValue;
Point bestPoint;
FindBestMatchPointAndValue(imageDest, compareMethod, out bestValue, out bestPoint);
// Draw a rectangle with the same size of the template at the best-match point
Rectangle rect = new Rectangle(bestPoint, patchSize);
result = imageDest.Convert <Bgr, byte>();
sw.Stop();
// Disposal
imageSource.Dispose();
imageSource2.Dispose();
imageTarget.Dispose();
imageTarget2.Dispose();
if (imageDest != null)
{
imageDest.Dispose();
}
foreach (Image <Gray, Byte> image in imagesSource)
{
image.Dispose();
}
histTarget.Dispose();
return(new Tuple <Image <Bgr, byte>, Rectangle, double>(result, rect, bestValue));
}
// Histogram compare method.
private static HISTOGRAM_COMP_METHOD GetHistogramCompareMethod()
{
HISTOGRAM_COMP_METHOD compareMethod = HISTOGRAM_COMP_METHOD.CV_COMP_CORREL;
compareMethod = HISTOGRAM_COMP_METHOD.CV_COMP_CORREL;
return(compareMethod);
}
// Find the best match point and its value.
private static void FindBestMatchPointAndValue(Image <Gray, Single> image, HISTOGRAM_COMP_METHOD compareMethod, out double bestValue, out Point bestPoint)
{
bestValue = 0d;
bestPoint = new Point(0, 0);
double[] minValues, maxValues;
Point[] minLocations, maxLocations;
image.MinMax(out minValues, out maxValues, out minLocations, out maxLocations);
if (compareMethod == HISTOGRAM_COMP_METHOD.CV_COMP_CHISQR || compareMethod == HISTOGRAM_COMP_METHOD.CV_COMP_BHATTACHARYYA)
{
bestValue = minValues[0];
bestPoint = minLocations[0];
}
else
{
bestValue = maxValues[0];
bestPoint = maxLocations[0];
}
}
// Compares histogram over each possible rectangular patch of the specified size in the input images, and stores the results to the output map dst.
// Destination back projection image of the same type as the source images
public static Image <Gray, Single> BackProjectPatch <TDepth>(Image <Gray, TDepth>[] srcs, Size patchSize, DenseHistogram hist, HISTOGRAM_COMP_METHOD method, double factor) where TDepth : new()
{
Debug.Assert(srcs.Length == hist.Dimension, "The number of the source image and the dimension of the histogram must be the same.");
IntPtr[] imgPtrs =
Array.ConvertAll <Image <Gray, TDepth>, IntPtr>(
srcs,
delegate(Image <Gray, TDepth> img) { return(img.Ptr); });
Size size = srcs[0].Size;
size.Width = size.Width - patchSize.Width + 1;
size.Height = size.Height - patchSize.Height + 1;
Image <Gray, Single> res = new Image <Gray, float>(size);
CvInvoke.cvCalcBackProjectPatch(imgPtrs, res.Ptr, patchSize, hist.Ptr, method, factor);
return(res);
}
private int hack(DenseHistogram[] referenceHistogram, IEnumerable<DenseHistogram[]> testHistograms, HISTOGRAM_COMP_METHOD method, bool printHigh)
{
var comparisons = testHistograms.Select(x => GetHistogramComparison(x, referenceHistogram, method));
var multiplied = comparisons.Select(x => Math.Abs(x[0] * x[1] * x[2]));
var i = 0;
foreach (var x in comparisons)
{
Console.WriteLine("{0,1}: {1:E4} {2:E4} {3:E4} --- {4:E4}", i, x[0], x[1], x[2], multiplied.ToList()[i]);
i++;
}
var minAndMax = findMinAndMax(multiplied);
return printHigh ? minAndMax[1] : minAndMax[0];
}
