Rovio with camera image cropped

[Cristian-wp]

Hello, I am trying to use Rovio with a flir chameleon 3 that have a resolution on 1280x1024.
Unfortunately the only mounting position of the camera, allow to get in the image part of the robot frame. So I decided to crop the image in order to eliminate these elements. The new resolution is 1028x650, and I am started to get some nearly accettable results but the measure scale is really wrong.
I had use kalibr to get the configuration file cam0.yaml for the 1280x1024 resolution. I have to redo the calibration for this new resolution or I am missing something?
The results of the experimets converge, there is no divergence, but instead of 10m on X axis, its measure 2.5m.