# Exercise:Convolution and Pooling

### From Ufldl

(→Dependencies) |
(→Step 2a: Implement convolution) |
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In particular, you did the following to the patches: | In particular, you did the following to the patches: | ||

<ol> | <ol> | ||

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<li> subtract the mean patch, <tt>meanPatch</tt> to zero the mean of the patches | <li> subtract the mean patch, <tt>meanPatch</tt> to zero the mean of the patches | ||

<li> ZCA whiten using the whitening matrix <tt>ZCAWhite</tt>. | <li> ZCA whiten using the whitening matrix <tt>ZCAWhite</tt>. |