Hello, i'm using OpenCV for some objectrecognition application. When i calculate KeyPoints with a method like SIFT the KeyPoints have a parameter size. In the documentation it says that this is the diameter of KeyPoint. My question is how this is calculateted? Or is the parameter depending on the scale where a KeyPoint is found? And if yes, how?
Quoting the previous answer:
Keypoints are detected by Scale-Space extrema detection using Difference of Gaussian images. So the size is basically at what scale those points are detected.
This is somewhat incorrect:
The size of the patch being described is linear dependent on the keypoint scale, i.e. size = scale * magnifier. How you choose the magnification factor depends on the application.
Keypoints are detected by Scale-Space extrema detection using Difference of Gaussian images. So the size is basically at what scale those points are detected.
Asked: Feb 12 '13
Seen: 3,206 times
Last updated: Feb 23 '13
