Error while using calibrate_cameras

[sokol07]

When using calibrate_cameras I was getting such an error: cv2.error: OpenCV(3.4.3) C:\projects\opencv-python\opencv\modules\calib3d\src\calibration.cpp:1318: error: (-211:One of arguments' values is out of range) image width and height must be positive in function 'cvCalibrateCamera2Internal'

I found that #16 was a fix for similar issue. I reverted that change, placed self.image_size after calib.dist_coefs["right"] and everything is ok now.

So this piece of code look at the moment like that in my project:

calib = StereoCalibration()   
        (calib.cam_mats["left"], calib.dist_coefs["left"],  
         calib.cam_mats["right"], calib.dist_coefs["right"],  
         calib.rot_mat, calib.trans_vec, calib.e_mat,  
         calib.f_mat) = cv2.stereoCalibrate(self.object_points,  
                                            self.image_points["left"],  
                                            self.image_points["right"],  
                                            calib.dist_coefs["left"],  
                                            calib.cam_mats["right"],  
                                            calib.dist_coefs["right"],  
                                            self.image_size,  
                                            calib.rot_mat,  
                                            calib.trans_vec,  
                                            calib.e_mat,  
                                            calib.f_mat,  
                                            criteria=criteria,  
                                            flags=flags)[1:]  
                                          
  

[erget]

This is cool to know. Does cv2.stereoCalibrate use named argument? If that's the case, would you be willing to name the arguments in the invocation, à la cv2.stereoCalibrate(foo=bar) and send a PR?

[sokol07]

I found the documentation of cv2.stereoCalibrate but I'm confused... https://docs.opencv.org/2.4/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html#cv2.stereoCalibrate

"imageSize" is definitely in the place where #16 placed it. It was in the place where I placed it in old version ("import cv") but in my project I definitely have "import cv2". I'm not sure if this is really an issue or just some kind of a bug and on which side: SteroVision, OpenCV, Python or PyCharm...

[erget]

Hmm... Yeah, I don't have a setup where I can test it but the OpenCV API has been a bit volatile in the past, leading to such things. I don't think it's possible that Python or PyCharm could be causing it, and StereoVision has worked for a lot of people so I think what we're looking at is some change in the function header as exposed by OpenCV. I'm glad it's working for you now though.

[hezongfanghuaok]

in the opencv4.4 hais the same problem, self.image_size in the wrong place.

[Jmack66]

Had the exact same error code as @sokol07, tried the fix in #16 as well, but it didn't work, when I passed self.image_size as a named argument it told me that it was passed positionally in position 8 and by name, passing everything by name argument seemed to fix the order issues for me.