VPI Disparity Scale Factor?

[mcelhennyi]

It seems common for a 16 bit output disparity map to have a scale factor.

https://docs.nvidia.com/vpi/algo_stereo_disparity.html

OpenCV uses 16. Does VPI have a scale factor? The disparity values seem very small.

[AastaLLL]

Hi,

VPI doesn’t scale the disparity (or factor = 1).
Thanks.

[mcelhennyi]

Something seems off, when I give a max disparity of 64, the max value I get is 2016 - which is 63 * 32.

If I reduce the max to 63 I get a max value of 1984 - which is 62 * 32.

So it seems there is some sort of scaling going on - by a factor of 32?

This is with a 8 bit input, a window of 5, cuda backend, GPU frame input and output, 640x480 input and max disparity of the values stated above. VPI 1.0.

[AastaLLL]

Hi,

Sorry for the incorrect information.
Yes. The scaling factor is 32.

Thanks.