Significance of multiplying and dividing the camera intrinsic params by 4

[saikat-d]

I am not able to understand the Significance of multiplying and dividing the camera intrinsic params by 4 constant in file PSnet.py file to create variables
intrinsics4 and intrinsics_inv4

Is it related to resizing of the images from the original calibration resolution or something else?
Also please shed some light on how this parameter 4 should be adjust according to different configurations

[Sunghoon Im]

The size of the feature map is 1/4 of the image size, and we warp the feature map.
So, we need to use intrinsics4.