how to un-distort 90deg fov image with gpu?

Question

Hello,

I am toying around with the AR0135 
it comes with a default 3.6mm lens (88deg)

I am thinking of using it to observe markers on a flat ground for indoor localization.
I kinda like this near 90 field of view. but i do observe quite some distortion. Look on this preview with a white flat A4 paper is not a rectangle at all (not too mention that the sides of the image seem darkish and fuzzy)

i am pretty sure i have read -- maybe on the forum => http://jevois.org/qa/index.php?qa=153 -- that jevois comes with software to un-distort the image with its gpu somehow. i'd like to test that. but i am unsure of the vocabulary to use in order to search in the docs and no default module seems to be doing that. 

what's the best way to get started? 

thanks

Answer 1

yes, following that post that you found, we wrote this module:

http://jevois.org/moddoc/DemoGPU/modinfo.html

which includes a barrel distortion shader (called Dewarp).

source here: http://jevois.org/basedoc/jvpkg_2modules_2JeVois_2DemoGPU_2DemoGPU_8C_source.html

Now, this is C++ only and you should use this component in your module: http://jevois.org/basedoc/classFilterGPU.html

Another approach is to use the CPU and OpenCV in python. A quick search on the web returns lots of results, for example:

https://medium.com/@kennethjiang/calibrate-fisheye-lens-using-opencv-333b05afa0b0