Hi,
I want to extract sift features for custom defined keypoints. There is a class cv::KeyPoint that can be used to create custom points. However, I am not sure how to decode the proper information in 'size' and 'octave' parameters. I want to extract descriptors for various scales, e.g.: 3, 5, 7. What values should I use for 'size' and 'octave'? Any ideas?