Why are pixels in left side shifted by certain amount in stereoBM cuda version and in cpu version for the image given in opencv example

C++
,
1

This is the data folder opencv/samples/data at 3.4 · opencv/opencv · GitHub
I tried to use left image (aloeL.jpg) and right image (aloeR.jpg) from opencv example i used the same code which opencv provided but my results are like this
cuda:

output_opencv_stereoBM
output_opencv_stereoBM1282×1110 161 KB

but the ground truth should have been like this (aloeGT.png) in the data folder

2

I used to be able to explain it. anyway, it’s not a mistake. it’s a consequence of the geometry itself.

3

Is there a way to get disparity map for entire image using opencv because i have seen at some places where they have attained it example here GitHub - thiagortk/Stereo-Vision: C++ example codes for camera calibration, rectification and to build disparity maps