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Stereoscopic vision help

Hi, I am willing to built a stereoscopic navigation system (which will have 2 paralel webcams to capture images every X second and compare images with each other to find depth)  just for fun and coding challenge(more challenge actually) but i have no idea how to do that, i am searching and reading sources with all kind. however since i have no idea where to start more i read it makes me feel more confused and i cannot find a complete guide to follow.