convol.c File Reference

Detailed Description

Usage: convol in.pgm kernel.pgm [mode] out.pgm

Description: Convolution of in.pgm by kernel.pgm. The result is a float image. Depending on the value given for the (optional) parameter mode:

• mode = 0 (default) : naive algorithm. The image in.pgm is considered as null out of its support.
• mode = 1 : naive algorithm. The boundary of image in.pgm is extended outside its support.
• mode = 2 : convolution using the FFT. The image in.pgm is considered as null out of its support.
• mode = 3 : convolution using the FFT. The boundary of image in.pgm is extended outside its support.

Category: signal

Warning:

Naive convolution algorithm is in O(|in|*|kernel|). For large kernels, use FFT version which is in O(n log n) where n = max(|in|,|kernel|)

Author:

Michel Couprie

Generated on Fri Dec 17 11:59:37 2004 for Pink by 1.2.18