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OpenCV contains one image stitching module. The pipeline is followed enter image description here

There is one step named Resize. As I understand, the step is added in order to reduce computation because feature detection for one big image may need a lot of time. However, the homography calculated from one pair of two smaller images can't apply to the original images. Any help is appreciated.

Jogging Song
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Since the homography matrix can be perceived as a transformation matrix; the homography matrix which is estimated for the scaled image can be used with original size image as well.

H_orig = H_scale * H_estimated is a valid operation. You can read more about the homography matrix and what its components stand for from here and here.

eiki
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  • From the link https://stackoverflow.com/questions/21019338/how-to-change-the-homography-with-the-scale-of-the-image/48915151#48915151, Hs is not same as H in the second answer. – Jogging Song Jul 07 '18 at 14:31