Firstly, About the Hierarchical Model And X (HMAX model), i still don't understand what is the difference between the "Original model" and "Standard model". Does in Standard, we use imfilter not conv2 ? is that correct ?
Secondly, i didn't understand the following phrase : "The filters in S1 layer are sum-normalized to zero and square-normalized to 1, and the result of the convolution of an image patch with a filter is divided by the power (sum of squares) of the image patch. "
What was meant by sum-normalized and square normalized ?
for example :
Please i need your help and explanations. Any help will be very appreciated.