In my stereo-rectified camera pair (not physical, but two positions of the same camera), when I project some 3D points in both images to find a rough disparity range, I often get a range that goes from negative to positive (e.g. -11, 24). I have no problem with ranges like (-22, -10) or (10, 15).
Is that kind of range even possible? When I do stereo matching how should I treat negative values? And what about the depth calculated from that disparity that can have negative values (and possibly areas with lowest cost at 0 disparity)?