private int GetPatchCode(Image <Gray, byte> patch)
{
PixelComparisonF[] comparisons = _pixelComparisonScheduler.GetComparisonsForClassifier(_myIndex);
// stretch comparisons over the patch
StretchComparisons(patch.Size, comparisons, _strechedComparisons);
// calculate the code
int binaryCode = 0;
for (int i = 0; i < _strechedComparisons.Length; i++)
{
PixelComparisonF strechedComparison = _strechedComparisons[i];
double i1 = patch[Point.Round(strechedComparison.Pixel1)].Intensity;
double i2 = patch[Point.Round(strechedComparison.Pixel2)].Intensity;
// actual bit
if (i1 > i2)
{
binaryCode = binaryCode | bitMask[i];
}
}
return(binaryCode);
}
public void SchedulePixelComparisons()
{
List <PixelComparisonF> allPixelComparisons = new List <PixelComparisonF>(_allPixelComparisons);
_scheduledPixelComparisons = new PixelComparisonGroupF[_baseClassifierCount];
for (int i = 0; i < _baseClassifierCount; i++)
{
_scheduledPixelComparisons[i] = new PixelComparisonGroupF();
_scheduledPixelComparisons[i].Value = new PixelComparisonF[_maxComparisonsPerClassifier];
}
_comparisonsPerClassifier = 0;
while (allPixelComparisons.Count >= _baseClassifierCount && _comparisonsPerClassifier < _maxComparisonsPerClassifier)
{
for (int i = 0; i < _baseClassifierCount; i++)
{
PixelComparisonF comparison = allPixelComparisons.RandomElement();
_scheduledPixelComparisons[i].Value[_comparisonsPerClassifier] = comparison;
allPixelComparisons.Remove(comparison);
}
_comparisonsPerClassifier += 1;
}
if (_comparisonsPerClassifier < _maxComparisonsPerClassifier)
{
for (int i = 0; i < _baseClassifierCount; i++)
{
Array.Resize(ref _scheduledPixelComparisons[i].Value, _comparisonsPerClassifier);
}
}
}
private void StretchComparisons(Size size, PixelComparisonF[] comparisons, PixelComparisonF[] strechedComparisons)
{
int width = size.Width;
int height = size.Height;
for (int i = 0; i < comparisons.Length; i++)
{
PixelComparisonF comparison = comparisons[i];
PointF strechedPixel1 = comparisons[i].Pixel1.Multiply(width - 1, height - 1);
PointF strechedPixel2 = comparisons[i].Pixel2.Multiply(width - 1, height - 1);
strechedComparisons[i] = new PixelComparisonF(strechedPixel1, strechedPixel2);
}
}
public Point[][] StretchComparisonsOnWindow(int windowIndex)
{
// get normalized comparisons
PixelComparisonF[] normalizedComparisons = _pixelComparisonScheduler.GetComparisonsForClassifier(_myIndex);
int comparisons = normalizedComparisons.Length;
// allocate space for stretched comparisons
Point[][] stretchedComparisons = new Point[comparisons][];
for (int i = 0; i < comparisons; i++)
{
stretchedComparisons[i] = new Point[2];
}
// get scanning window and its parameters
ScanningWindow window = _scanningWindowGenerator.ScanningWindows[windowIndex].ScanningWindow;
Point windowLocation = window.Location;
Size windowSize = window.Size;
int windowWidth = windowSize.Width;
int windowHeight = windowSize.Height;
int windowWidthMinus1 = windowWidth - 1;
int windowHeightMinus1 = windowHeight - 1;
// calculate stretched comparisons
for (int i = 0; i < comparisons; i++)
{
PixelComparisonF normalizedComparison = normalizedComparisons[i];
Point[] stretchedComparison = stretchedComparisons[i];
Point stretchedPixel1 = new Point((int)Math.Round(normalizedComparison.Pixel1.X * windowWidthMinus1 + windowLocation.X), (int)Math.Round(normalizedComparison.Pixel1.Y * windowHeightMinus1 + windowLocation.Y));
Point stretchedPixel2 = new Point((int)Math.Round(normalizedComparison.Pixel2.X * windowWidthMinus1 + windowLocation.X), (int)Math.Round(normalizedComparison.Pixel2.Y * windowHeightMinus1 + windowLocation.Y));
stretchedComparison[0] = stretchedPixel1;
stretchedComparison[1] = stretchedPixel2;
}
return(stretchedComparisons);
}