convol2d

discrete 2-D convolution, using fft.

Calling Sequence

C = convol2d(A,B)

Parameters

:A a real or complex 2-D array. : :B a real or complex 2-D array. : :C a real or complex 2-D array. :

Description

convol2d uses fft to compute the full two-dimensional discrete convolution. The dimensions of the result C are given by size(A)+size(B)+1. The indices of the center element of B are defined as floor((size(B)+1)/2).

Examples

s = [1 2 1; 0 0 0; -1 -2 -1];//Sobel horizontal edge kernel
A = `zeros`_(10,10);A(3:7,3:7) = 1;
convol2d(s,A);

See Also

• `conv2`_
• `convol`_

Used Functions

The convol2d function is based on the `fft`_ builtin.

History

Version Description 5.4.0 Function convol2d introduced. .. _fft: fft.html .. _conv2: conv2.html .. _convol: convol.html