Java video app uses
Imgproc.undistort(frameIn,frameout_undist,cameraMatrix,distCoeffs,camUndistortMatrix);
to flatten a radially distorted image with versions up to OpenCV 3.4.3. My upgrade to OpenCV 4.1.1 just broke this call and I cannot find the equivalent function in the new API. I provide the distorted image frameIn, a buffer for the undistorted image frameout_undist, the camera and distance coefficients cameraMatrix and distCoeffs, and the optimal undistortion matrix derived from Calib3d.getOptimalNewCameraMatrix(). I was hoping someone would point me to the approve way to undistort images in Opencv 4.