why is calculating convolution in frequency domain quicker than conv2()
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
so i have two programs written that calculate the convolution of a picture with a high-pass filter and i used tic/toc to calculate the time it took to make the calculations. it showed that ifft2(fft2(a)*fft2(b)) was faster than conv2(). could someone explain why these calculations are done faster in the frequency domain?
2 comentarios
Rik
el 5 de Mayo de 2018
The direct calculation is the fastest method anyway, so I would image conv2 would need to do some input checking before it concludes that it is the faster method. Or maybe something else is going on. cellfun('length',A) being much faster than cellfun(@length,A) has it's roots in how the function started, although why this is still the case is a mystery to me.
Respuestas (0)
Ver también
Categorías
Más información sobre Read, Write, and Modify Image en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!