To perform convolution in image processing

I need convolution in image processing in particular iris recognition without using conv command.

Answer 1

[Walter Roberson]

Is there a particular reason you cannot use the conv() command?

Answer 2

[Bjorn Gustavsson]

If you cant use conv - then there is always the more relevant conv2!

[David Young]

Also filter2, which does convolution in the end, and convolve2 from the FEX.

[Image Analyst]

And imfilter() in the Image Processing Toolbox (if he's even allowed to use that!). Most likely it's an assignment to build an app without using built-in functions so the student has to write all their own stuff from scratch, such as conv2. Presumably this would give them a better feeling for what convolution does, than to just call it as a black box.

[Bjorn Gustavsson]

You mean that some students might actually ask us to do their assignments without showing signs of own attempts or efforts? That is shocking!