/// <summary>
/// Process image looking for interest points.
/// </summary>
///
/// <param name="image">Source image data to process.</param>
///
/// <returns>Returns list of found interest points.</returns>
///
public List <FastRetinaKeypoint> 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 <FastRetinaKeypoint> features = new List <FastRetinaKeypoint>();
for (int i = 0; i < corners.Count; i++)
{
features.Add(new FastRetinaKeypoint(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 != FastRetinaKeypointDescriptorType.None)
{
descriptor = GetDescriptor();
descriptor.Compute(features);
}
return(features);
}
/// <summary>
/// Gets the <see cref="FastRetinaKeypointDescriptor">
/// feature descriptor</see> for the last processed image.
/// </summary>
///
public FastRetinaKeypointDescriptor GetDescriptor()
{
if (descriptor == null || pattern == null)
{
if (pattern == null)
{
pattern = new FastRetinaKeypointPattern(octaves, scale);
}
descriptor = new FastRetinaKeypointDescriptor(grayImage, integral, pattern);
descriptor.Extended = featureType == FastRetinaKeypointDescriptorType.Extended;
}
return(descriptor);
}
