CalibrationParameters-Matlab2NumPy

This repo is for the conversion of a MATLAB style .mat calibration parameter to a OpenCV style numpy .npz file.

Note: OpenCV, by default, uses 3 parameters for radial disotrtion and 2 parameters for tangencial distortion. Make sure that during the MATLAB calibration, 3 coefficients setting for Radial Distortion is chosen and also compute tangential distortion is chosen.

How to convert .mat to .npz?

1. Calibrate the camera as usual using MATLAB and save the parameters. Here teh saved file will be referred as camera_parameters.

2. Save as the camera_parameters as a struct :

   camera_parameters_struct = struct(camera_parameters)

3. Clone this repository to the folder where the .mat file is saved to

   git clone https://github.com/yusufguleray/CalibrationParameters-Matlab2NumPy.git
   

4. Run the script with first argument as the name of the name of the .mat file, second argument for the name of the numpy file to be created.

   python .\CalibrationParameters-Matlab2NumPy\mat2np.py <camera_parameters_struct.mat> <name_of_output.npz>
   

How to use the calibration data from .npz file?

import utils

calib_file_name = "output.npz"  # name of the .npz file that the camera parameters are saved in 
calib_mtx, dist_coef = utils.getCalibData(calib_file_name)