I downloaded an OpenCV.js from here. But I just realised that there is no RQDecomp3x3 method. I need to get angles from the rotation matrix. Any suggestion?
According to Chirstoph Rachwitz's suggestion here
I just added RQDecomp3x3 in opencv_js.config.py, and compiled the library again
calib3d = {
'': [
...
'projectPoints',
'undistort',
'RQDecomp3x3',
...
],
}