algorithm to implement 'fspecial' function for motion blur.

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Park Gabyong
Park Gabyong 2018-5-5
编辑： Park Gabyong 2018-5-6
Hello. I found a code to implement 'fspecial' function for motion blur as follows. https://kr.mathworks.com/matlabcentral/fileexchange/16201-toolbox-image?focused=5133070&tab=function The result of the code is same as one of the matlab function 'fspecial('motion',).
It seems that distance from each pixel to the rotated line is used. However, I could understand it only a little. Is there any documentation or figure to understand it?
Thank you for your time.

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