Be the first to rate this file! 11 Downloads (last 30 days) File Size: 9.36 KB File ID: #30656

conv2fft_reuse

by

 

06 Mar 2011 (Updated )

Reuse intermediary results in multiple related convolutions with the same data but different kernels

| Watch this File

File Information
Description

Sometimes you have to perform multiple related convolutions, using the same data but different kernels. This function allows you to reuse intermediary results. When computing the convolution via multiplication in the frequency domain, we reuse the FFT of the data, and need to compute only the FFT of the kernel and the IFFT of their product. So this helps if the kernels are small and many and the data is large and unique. Matrix (not just vector) input is supported. Calling syntax is identical to Matlab's own conv2/filter2. If you need an FFT-based implementation of convolution without reuse, I'd recommend submission number 24504. Run test('filter2fft') to check your installation.

Acknowledgements

Fft Based Convolution and Testit inspired this file.

MATLAB release MATLAB 7.9 (R2009b)
Tags for This File   Please login to tag files.
Please login to add a comment or rating.
Updates
07 Mar 2011

updated list of acknowledgements and list of incorporated submissions.

Contact us