Non-existent file pointed by which
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Fernando Iglesias
on 2 Feb 2017
Commented: Walter Roberson
on 18 Jun 2021
visionDistortPoints seems to be a built-in function from the computer vision toolbox.
>> which visionDistortPoints
built-in (/MATLAB/R2016b/toolbox/vision/vision/visionDistortPoints)
However, there is no visionDistortPoints file corresponding to the output of which. Note also that visionDistortPoints can be called from the Matlab prompt.
Where is the function visionDistortPoints or how can I find out where it is?
Thanks in advance!
2 Comments
AP
on 17 Jun 2021
Were you able to figure this out?
I am looking to get back the distorted points from the undistorted points.
Walter Roberson
on 18 Jun 2021
visionDistortPoints is a built-in function. Source for it is not available except to Mathworks employees.
However, as I indicated, source is available for a version used for generating code
If you need to know exactly which shared library contains the implementation, then I am unlikely to put together the resources to be able to do the analysis, except perhaps for MacOS (in which case I would just verify that the library name I used below still works.)
Accepted Answer
Walter Roberson
on 5 Feb 2017
R2016b, when deploying to code, on OS-X it uses
/Applications/MATLAB_R2016b.app/toolbox/vision/vision/+vision/+internal/+calibration/distortPoints.m
When not deploying to code, on OS-X it uses
/Applications/MATLAB_R2016b.app/bin/maci64/libmwvision.dylib
In some later version of the code it is plausible that cv::fisheye::distortPoints might get used in some circumstances, not entirely different from the way that /Applications/MATLAB_R2016b.app/toolbox/vision/builtins/src/ocvcg/opencv/include/opencv2/calib3d/calib3d.hpp is used to refer to cv::fisheye::undistortPoints
6 Comments
Walter Roberson
on 8 Feb 2017
I am not sufficiently familiar with the Linux object format to make a reasonable guess on that :(
Walter Roberson
on 18 Jun 2021
I found a couple more potential matches in R2021a; I am not sure which of those files is called under what circumstances.
Binary file ./bin/maci64/builtins/vision_builtins/mwvision_builtinimpl.dylib matches
Binary file ./bin/maci64/libopencv_calib3d.4.2.0.dylib matches
Binary file ./bin/maci64/libmwvision.dylib matches
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