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Hello,

I could solve my issue. I executed the following steps:

1. First, I disabled all the image transport plugins based on this answer command; This do not changed GPU memory consumption, which eliminates image transport as a culprit.
2. I was loading the camera parameters from a parameter file, and it seems that this parameter file was causing the camera driver to use GPU, and when the driver loads the parameter file it overwrites all the previous camera parameters. Since I was setting DIB mode before loading parameters it was being overwritten, so I just forced the DIB mode after my driver loads the parameter file and the GPU memory consumption problem is gone.