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Why has DisparityWLSFilter been removed from OpenCV 3.0.0?

I've been trying to build on OpenCV 3.0.0 the extra modules sample that uses post filtering to improve the stereo matching depth map, but the support functions such as DisparityWLSFilter generate unresolved errors.

Does anyone know the situation, and what is the best way to build this sample?

Why has DisparityWLSFilter been removed from OpenCV 3.0.0?

I've been trying to build on OpenCV 3.0.0 the extra modules sample that uses post filtering to improve the stereo matching depth map, but the support functions such as DisparityWLSFilter generate unresolved errors.

[I later downloaded the contrib release for 3.0.0. but it has disparity_filter.cpp removed] - see https://github.com/Itseez/opencv_contrib/releases

Does anyone know the situation, and what is the best way to build this sample?