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Asked: 2026-06-05T09:16:16+00:00

I am using opencv warpPerspective to generate images with different rotation to evaluate my

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I am using opencv warpPerspective to generate images with different rotation to evaluate my feature point detection algorithm.

In homography matrix, the up-left 2×2 matrix is the rotation matrix, as referred here.

But the result is a rotation about the origin( the up-left corner), how can I modify the homography matrix to rotate the image about its center?

Regards.

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1 Answer

  1. Editorial Team

    See this matrix

    enter image description here

    an affine transformation that translates and rotates, center is the center of rotation. To get a homography from this just need to add the last raw [ 0 0 1]. You can use getRotationMatrix2D to compute this matrix, and then either use warpAffine or form the homography and use warpPerspective. Please let us know how it goes.

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