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Th results of decomposeHomographyMat meaning

I have single calibrated RGB camera that is moving around a static object. I took two senescence shots and compute the Homography between them.

Then, using Camera Matrix and Homography, I call cv::decomposeHomographyMat which gives me possible rotations angles and translations.

Suppose that always the first pair of rotation and translation the correct one, what do those angles and translation mean? what is the origin of this transformation. Is it about the camera origin? is it about the object origin?