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| 2017-02-07 09:38:18 -0600 | commented answer | SIFT descriptor for custom keypoints Hi @LBerger. Thank you for your reply. I will try to play with your code and study Lowe's paper one more time. Basically, what I need is a function that will calculate the octave. The input from my side is: x, y, scale. |
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| 2017-01-31 05:37:49 -0600 | asked a question | SIFT descriptor for custom keypoints 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? |
| 2017-01-30 17:23:21 -0600 | commented question | How do I create custom KeyPoints to compute SIFT? @berak: in some applications, it may be required to base on custom key points, e.g. face recognition |
| 2017-01-30 17:23:10 -0600 | answered a question | How do I create custom KeyPoints to compute SIFT? Hi, Any update on this issue? I am trying to calculate the SIFT descriptor for various scales: 3, 5, 7 at the given points. However, there is no 'scale' parameter in cv::KeyPoint class directly. I tried to play with 'octave', 'size' parameters but I am not sure how to set them correctly? Any ideas? |