This app 'keystone corrects' a given image. Basically, it straightens merging lines to correct perspective as expected in photos of tall buildings, snapshots of display boards shot at an angle, etc. A discussion of the algorithm behind this app is given here: https://jkmsmkj.wordpress.com/2013/07/27/projective-transformations .
Any feature suggestions or comments are welcome. Thanks for trying the app (if you did, that is) and enjoy (the life, in general)!
JKMSMKJ (2021). KeystoneCorrector (https://www.mathworks.com/matlabcentral/fileexchange/50971-keystonecorrector), MATLAB Central File Exchange. Retrieved .
Keystone Corrector (https://www.mathworks.com/matlabcentral/fileexchange/50971), JKMSMKJ (2019), MATLAB Central File Exchange. Retrieved April 29, 2019.
Thanks, I updated Matlab to R2019b and it runs now.
David: It seems like you are trying to run KC on a MATLAB release that does not support GridLayout. KC has been tested on R2019a and R2019b. It may run on R2018b too but nothing earlier than that. Please try KC on a compatible MATLAB release and let me know if you still get errors. Thanks.
[If you do not mind installing a standalone app, you can visit the blogspot link in the description of this app and get that installer instead, which should run regardless of the MATLAB version you have.]
Installs but doesn't run - errors
Error using KeystoneCorrectorApp/startApp (line 90)
Error defining property 'hpA' of class 'KeystoneC':
Class named 'matlab.ui.container.GridLayout' is undefined or does not support property validation.
Thanks Nikolay. I don't use the image processing toolbox so can't help you with the built-in functions.
I can share my basic code if you send me an email.
Very nice app, but I need to correct for distortion series of images, so I will have to write my own code for this purpose. Could you tell me, what function do you use to warp the image after the parameters of transformation are determined? I tried to calibrate the camera, then using projective2d to determine transformation, invert and imwarp to correct the distortion, but this seems the wrong way, since imwarp produces downsampled image.
Chun-Jen Hsueh: Could you please let me know the error you get when trying to load an image? Thanks.
This app doesn't work. I can not even read an image.
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