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| 2013-09-03 09:00:30 -0600 | asked a question | Color of Keypoint with floating coordinates There are some missunderstandings, so I changed the question: The coordinates of a keypoint are saved with floating values. KeyPoint(float x, float y, float _size, float _angle=-1, float _response=0, int _octave=0, int _class_id=-1) So the coordinates do not exactly match with a certain pixel but is within one pixel. That's how I unterstand it. Maybe I missunderstood. I detect features to get color information. When I have keypointBob he is somewhere in the image img. I can get the color value by calling: img.at<vec3b>( keypointBob.pt)[] Is OpenCv taking directly the color of the pixel (where the keypoint is within) or does OpenCv consider the neighbors? I hope it's more clear now. |