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How can I keep horizontal and vertical FoV after undistortion

Hi everyone,

I've used initUndistortRectifyMap() and Remap() to undistort image, but I have no idea how to crop the ROI I want. I want it keep the region of original horizontal and vertical FoV, I've try getOptimalNewCameraMatrix() with different alpha 0~1, just can not get it.

Any idea? Thanks!