What is the meaning of response function in image processing?

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In cross subject test protocol for action recognition task, training and testing sets only considered. what about validation set?

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What is the difference between the Feature Descriptor and Feature Vector in image processing?

Explanation of Feature Descriptor and Feature Vector with examples.

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Programming related (Python)

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How to view HoG descriptor of an image?

Matlab code for viewing HoG descriptor.

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What is difference between Motion History Image and Motion Energy Image?

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high frequency and low frequency definitions with explanations

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Khalid Al-Hussaini

Dear, all what you want about Image Processing with MATLAB, in this link:

https://studentnet.cs.manchester.ac.uk/ugt/COMP27112/doc/matlab.pdf

Victoriya V Abramova

https://en.wikipedia.org/wiki/Linear_response_function

http://www.mathworks.com/help/images/functionlist.html

http://www.mathworks.com/help/matlab/ref/conv2.html