/// <summary>
/// Computes an image descriptor using the set visual vocabulary.
/// </summary>
/// <param name="image">Image, for which the descriptor is computed.</param>
/// <param name="keypoints">Keypoints detected in the input image.</param>
/// <param name="imgDescriptor">Computed output image descriptor.</param>
/// <param name="pointIdxsOfClusters">pointIdxsOfClusters Indices of keypoints that belong to the cluster.
/// This means that pointIdxsOfClusters[i] are keypoint indices that belong to the i -th cluster(word of vocabulary) returned if it is non-zero.</param>
/// <param name="descriptors">Descriptors of the image keypoints that are returned if they are non-zero.</param>
public void Compute(InputArray image, ref KeyPoint[] keypoints, OutputArray imgDescriptor,
out int[][] pointIdxsOfClusters, Mat descriptors = null)
{
if (IsDisposed)
{
throw new ObjectDisposedException(GetType().Name);
}
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
if (imgDescriptor == null)
{
throw new ArgumentNullException(nameof(imgDescriptor));
}
using (var keypointsVec = new VectorOfKeyPoint(keypoints))
using (var pointIdxsOfClustersVec = new VectorOfVectorInt())
{
NativeMethods.features2d_BOWImgDescriptorExtractor_compute11(ptr, image.CvPtr, keypointsVec.CvPtr,
imgDescriptor.CvPtr, pointIdxsOfClustersVec.CvPtr, Cv2.ToPtr(descriptors));
keypoints = keypointsVec.ToArray();
pointIdxsOfClusters = pointIdxsOfClustersVec.ToArray();
}
GC.KeepAlive(image);
GC.KeepAlive(imgDescriptor);
GC.KeepAlive(descriptors);
}
/// <summary>
/// Computes an image descriptor using the set visual vocabulary.
/// </summary>
/// <param name="keypointDescriptors">Computed descriptors to match with vocabulary.</param>
/// <param name="imgDescriptor">Computed output image descriptor.</param>
/// <param name="pointIdxsOfClusters">Indices of keypoints that belong to the cluster.
/// This means that pointIdxsOfClusters[i] are keypoint indices that belong to the i -th cluster(word of vocabulary) returned if it is non-zero.</param>
public void Compute(InputArray keypointDescriptors, OutputArray imgDescriptor, out int[][] pointIdxsOfClusters)
{
ThrowIfDisposed();
if (keypointDescriptors == null)
{
throw new ArgumentNullException(nameof(keypointDescriptors));
}
if (imgDescriptor == null)
{
throw new ArgumentNullException(nameof(imgDescriptor));
}
using (var pointIdxsOfClustersVec = new VectorOfVectorInt())
{
NativeMethods.features2d_BOWImgDescriptorExtractor_compute12(
ptr, keypointDescriptors.CvPtr, imgDescriptor.CvPtr, pointIdxsOfClustersVec.CvPtr);
pointIdxsOfClusters = pointIdxsOfClustersVec.ToArray();
}
GC.KeepAlive(keypointDescriptors);
GC.KeepAlive(imgDescriptor);
}