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I know how to perform a circular convolution with vectors (http://engineering-matlab.blogspot.it/2010/12/matlab-program-for-implementing_5864.html) and I know that circular convolution can be obtained with the convolution theorem (FFT) for matrices, but how to convert a circular convolution-obtained matrix to a linear one (I mean a normal matrix as result of a classic 2D convolution)?

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Closely related to this question on dsp.SE by a different user. –  Dilip Sarwate Jul 4 '12 at 12:33
    
thank you, but without a good answer unfortunately –  Marco Jul 4 '12 at 12:40
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