private bool ComputeHistogram(Roi roi)
{
// For now, only allow ROIs of grayscale images
GrayscalePixelData pixelData = roi.PixelData as GrayscalePixelData;
if (pixelData == null)
{
this.Enabled = false;
return(false);
}
int left = (int)Math.Round(roi.BoundingBox.Left);
int right = (int)Math.Round(roi.BoundingBox.Right);
int top = (int)Math.Round(roi.BoundingBox.Top);
int bottom = (int)Math.Round(roi.BoundingBox.Bottom);
// If any part of the ROI is outside the bounds of the image,
// don't allow a histogram to be displayed since it's invalid.
if (left < 0 || left > pixelData.Columns - 1 ||
right < 0 || right > pixelData.Columns - 1 ||
top < 0 || top > pixelData.Rows - 1 ||
bottom < 0 || bottom > pixelData.Rows - 1)
{
this.Enabled = false;
return(false);
}
var roiPixelData = new List <double>(roi.GetPixelValues()).ToArray();
Histogram histogram = new Histogram(
_minBin, _maxBin, _numBins, roiPixelData);
_bins = histogram.Bins;
_binLabels = histogram.BinLabels;
NotifyPropertyChanged("MinBin");
NotifyPropertyChanged("MaxBin");
NotifyPropertyChanged("NumBins");
this.Enabled = true;
return(true);
}