opencv


Why do SURF feature points have floating point coordinates?


I have just written the C++ OpenCV 2.4.7 code to extract feature points in stereo images using SurfFeatureDetector. It worked well but I got confused when I realized that the point coordinates are floating points, say for example it found coordinates [283.23 123.424] as one of the features in left image.
Here is a part of the code (simply extracting features):
int minHessian = 400;
SurfFeatureDetector detector(minHessian);
vector<KeyPoint> featuresLeft, featuresRight;
detector.detect(leftImg, featuresLeft);
detector.detect(rightImg, featuresRight);
Can anyone please tell me how this could be happening?
Is there any interpolation involved in the built-in functions?

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