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Hello Sabrina,

IMHO, this is perfectly normal in the context of stereography. As you say, it is due to the quadratic interpolation done by stereo_image_proc.

Have a look at chapter 12 of the book "learning openCV", it explains this process. In the main line, the problem is that there is a nonlinear relationship between the disparity (distance in pixel between left and right image) and the real distance.

Did you try following this tutorial on tuning stereo_proc parameters?

Hope it helps

Raph