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stereocalibration Qs

i have a pair of webcameras and would love to calibrate it with opencv stereoCalibrate function.
The complete code could be found here:
https://github.com/bruce95/stereocam/blob/master/attach.py

While executing it ,i use :
chessboard_calibrate_alone_with_data_saving('cam1',obj_points,7,7,(640,480),'cam1') chessboard_calibrate_alone_with_data_saving('cam2',obj_points,7,7,(640,480),'cam2') stereo_match(stereo_calibrate('cam1/2.jpg','cam2/2.jpg'(640,480),load1=True,load2=True,load_name1='cam1',load_name2='cam2'))

The camera 1 pics are here: https://github.com/bruce95/stereocam/tree/master/pic1
The camera 2 pics are here: https://github.com/bruce95/stereocam/tree/master/pic2
The program works fluently with no errors,but the remaped result is very strange:
https://github.com/bruce95/stereocam/blob/master/Figure_1.png
https://github.com/bruce95/stereocam/blob/master/Figure_1-1.png
So is the match result(disparity map): https://github.com/bruce95/stereocam/blob/master/Figure_1-2.png

Anyone knows what the problem is?