public List <ScaleInvariantFeatureTranformKeypoint> ProcessImage(UnmanagedImage image)
{
// check image format
if (
(image.PixelFormat != PixelFormat.Format8bppIndexed) &&
(image.PixelFormat != PixelFormat.Format24bppRgb) &&
(image.PixelFormat != PixelFormat.Format32bppRgb) &&
(image.PixelFormat != PixelFormat.Format32bppArgb)
)
{
throw new UnsupportedImageFormatException("Unsupported pixel format of the source image.");
}
// make sure we have grayscale image
if (image.PixelFormat == PixelFormat.Format8bppIndexed)
{
_grayImage = image;
}
else
{
// create temporary grayscale image
_grayImage = Grayscale.CommonAlgorithms.BT709.Apply(image);
}
// 1. Extract corners points from the image.
List <IntPoint> corners = Detector.ProcessImage(_grayImage);
List <ScaleInvariantFeatureTranformKeypoint> features = new List <ScaleInvariantFeatureTranformKeypoint>();
for (int i = 0; i < corners.Count; i++)
{
features.Add(new ScaleInvariantFeatureTranformKeypoint(corners[i].X, corners[i].Y));
}
// 2. Compute the integral for the given image
_integral = IntegralImage.FromBitmap(_grayImage);
// 3. Compute feature descriptors if required
_descriptor = null;
if (_featureType != ScaleInvariantFeatureTranformKeypointDescriptorType.None)
{
_descriptor = GetDescriptor();
_descriptor.Compute(features);
}
return(features);
}
public ScaleInvariantFeatureTranformKeypointDescriptor GetDescriptor()
{
if (_descriptor == null || _pattern == null)
{
if (_pattern == null)
{
_pattern = new ScaleInvariantFeatureTranformKeypointPattern(_octaves, _scale);
}
_descriptor = new ScaleInvariantFeatureTranformKeypointDescriptor(_grayImage, _integral, _pattern);
_descriptor.Extended = _featureType == ScaleInvariantFeatureTranformKeypointDescriptorType.Extended;
}
return(_descriptor);
}
