private void OtsuThreshold()
{
if (!CheckIfGrayscale())
{
Greyscale();
}
AForge.Imaging.Filters.OtsuThreshold filter = new AForge.Imaging.Filters.OtsuThreshold();
// apply the filter
filter.ApplyInPlace(image);
}
public static bool HaveLabelRF(Bitmap imagePassport)
{
bool haveLabel = false;
// 1- grayscale image
Bitmap grayImage = AForge.Imaging.Filters.Grayscale.CommonAlgorithms.BT709.Apply(imagePassport);
// 2 - Otsu thresholding
AForge.Imaging.Filters.OtsuThreshold threshold = new AForge.Imaging.Filters.OtsuThreshold();
Bitmap binaryImage = threshold.Apply(grayImage);
AForge.Imaging.Filters.Invert invertFilter = new AForge.Imaging.Filters.Invert();
Bitmap invertImage = invertFilter.Apply(binaryImage);
// 3 - Blob counting
BlobCounter blobCounter = new BlobCounter();
blobCounter.FilterBlobs = true;
blobCounter.MinWidth = 10;
blobCounter.MinWidth = 10;
blobCounter.ProcessImage(invertImage);
Blob[] blobs = blobCounter.GetObjectsInformation();
// 4 - check shape of each blob
SimpleShapeChecker shapeChecker = new SimpleShapeChecker();
int count = 0;
foreach (Blob blob in blobs)
{
List <AForge.IntPoint> edgePoint = blobCounter.GetBlobsEdgePoints(blob);
// check if shape looks like a circle
AForge.Point center;
float radius;
if (shapeChecker.IsCircle(edgePoint, out center, out radius))
{
count++;
Rectangle cloneRect = new Rectangle((int)(center.X - radius), (int)(center.Y - radius + 1.0), (int)(radius * 2) + 1, (int)(radius * 2) + 1);
Bitmap RF = new Bitmap(binaryImage.Clone(cloneRect, binaryImage.PixelFormat), 32, 32);
Bitmap RF2 = AForge.Imaging.Filters.Grayscale.CommonAlgorithms.BT709.Apply(RF);
Bitmap RF3 = threshold.Apply(RF2);
if (CompareLabel(RF3) > 70.0)
{
haveLabel = true;
}
}
}
return(haveLabel);
}
