CAM.make_diag_normalization

[samirabdd]

After running the program, I get the following error, how do I fix it?

"Undefined variable "CAM" or class "CAM.make_diag_normalization".

Error in calibrate (line 52)
A = inv(CAM.make_diag_normalization(imcenter));

[ylochman]

Hello! Do you have VGTK as a submodule? If no, please run the following command:

git submodule update --init --recursive

[samirabdd]

Dear ylochman
The problem was solved. thank you
I have a series of images from the chessboard with which I have calibrated my camera with OCamCalib (Davide Scaramuzza ~ University of Zurich). Can I use those images in your algorithm and calibrate my camera?

[ylochman]

Hi @samirabdd,

I'm sorry for the late reply. Yes, you can calibrate you camera from these images with BabelCalib. You need to extract keypoints first, you can use any good chessboard detector for that (e.g., this one), and transform them into the format of corners and create boards. Then you can use calibrate function. Please let me know if you need any help with that.

[XavierQL]

@ylochman cc@pmoulon
Hi ylochman,
i deepdive in your babelcalib to want to find some clue for the corner detection. just see your reply above, inital corner detection is tough work, especially motion blur and high distortion for apriltag detection. So the cube in the repo and apriltag grid in your aritcle, can your share the sourcecode of inital corner detection?
much appreicated~