how to apply z transform for an image

i am currently working on applying z transform for images. in matlab, there is a function called ztrans in symbolic math toolbox for applying z transformation for symbolic expressions or matrix of symbolic expressions. could any one please suggest me how to apply z transformation for images, just as we would use fft or dwt2 for images?

Answer 1

[Dishant Arora]

doc czt

You can apply czt on each row followed by applying it on each column.

[Jayasri]

Thanks for your reply. And i would also like to know how to perform the inverse for this czt as there is no function in matlab for computing the inverse czt?

[Dishant Arora]

Here's a elaborate discussion on how to get igct : https://groups.google.com/forum/#!topic/comp.dsp/L_5J6aRu54c. Try to code it