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I found it the algorithm is set to StereoBM by default in the

image_pipeline/stereo_image_proc/cfg/Disparity.cfg

file at line 14 : gen.add("stereo_algorithm", int_t, 0, "sterel algorithm", 0, 0, 1, edit_method = stereo_algo_enum)

change the second last 0 in the line to 1 it will do... :)

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