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The problem was with the calibration of the camera itself. I was assuming, in the OpenCV calibration, that the aspect ratio of the focal length was the same for x and y, and that the camera primary point was in the center. Checking the documentation of the RealSense I realized that neither os those assumptions was correct. I forgot about that, and extract the calibration intrinsic parameters directly from the camera API. With that fixed, and the chessboard improved, I got the results of the picture below.

image description

As you can see the results now are much closer. Thank you so much for the help!

The problem was with the calibration of the camera itself. I was assuming, in the OpenCV calibration, that the aspect ratio of the focal length was the same for x and y, and that the camera primary point was in the center. Checking the documentation of the RealSense I realized that neither os those assumptions was correct. I forgot about that, and extract the calibration intrinsic parameters directly from the camera API. With that fixed, and the chessboard improved, I got the results of the picture below.below. All of them with 20 poses.

image description

As you can see the results now are much closer. Thank you so much for the help!