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rdbrewer's profile - activity

2013-05-26 19:33:54 -0500 asked a question Can the maximum stereo disparity of 128 be increased?


I've built a high-resolution stereo camera (two Prosilica GC2450-C cameras running at full-res), and I'm obtaining beautiful point-clouds that require both min_disparity and disparity_range to be set to 128. Unfortunately, I need to lengthen the target object such that I need disparity_range higher than 128. I'm using ROS's stereo_image_proc, which uses OpenCV for the stereo matching. The slider for disparity_range maxes out at 128 in stereo_image_proc.

I'm wondering if OpenCV allows for disparity higher than 128. Is there a way to hack around that maximum (or if 128 is a fundamental maximum in the stereo code). If it can be hacked, do you have suggestions for how to do so? I'm a mechanical engineer trying to code, so sorry if this is a noob question.

2013-05-26 19:30:36 -0500 asked a question What is stereo subpixel matching/interpolation precision?


I'm trying to figure out what the subpixel stereo matching precision is (that is, how many pixels/subpixels of disparity can the stereo matching algorithm interpolate to). I looked at the code a bit, and I think it's 1/4-pixel, but I've also heard it's 1/8-pixel. Do you which it is (or maybe a different value altogether)? Thanks!