Convolution using Fast Fourier Transform. More...

Functions

AFAPI array fftConvolve (const array &signal, const array &filter, const convMode mode=AF_CONV_DEFAULT)
 C++ Interface for FFT-based convolution any(one through three) dimensional signals. More...
 

Detailed Description

Convolution using Fast Fourier Transform.

A convolution is a common operation between a source array, a, and a filter (or kernel) array b. The answer to the convolution is the same as computing the coefficients in polynomial multiplication, if a and b are the coefficients.

Another way to think about it is that the filter kernel is centered on each pixel in a, and the output for that pixel or data point is the sum of the products.

Depending on the dimensions of the input signal and the filter signal, any one of the following batch mode convolutions take place.

Function Documentation

AFAPI array af::fftConvolve ( const array signal,
const array filter,
const convMode  mode = AF_CONV_DEFAULT 
)

C++ Interface for FFT-based convolution any(one through three) dimensional signals.

Parameters
[in]signalis the input signal
[in]filteris the signal that shall be used for the convolution operation
[in]modeindicates if the convolution should be expanded or not(where output size equals input)
Returns
the convolved array