Image Processing Toolbox

convmtx2

Compute two-dimensional convolution matrix

Syntax

• T = convmtx2(H,m,n)
  T = convmtx2(H,[m n])
  

Description

T = convmtx2(H,m,n) or T = convmtx2(H,[m n]) returns the
convolution matrix T for the matrix H. If X is an m-by-n matrix, then reshape(T*X(:),size(H)+[m n]-1) is the same as conv2(X,H).

Class Support

The inputs are all of class double. The output matrix T is of class sparse. The number of nonzero elements in T is no larger than prod(size(H))*m*n.

See Also

conv2

convmtx in the Signal Processing Toolbox User's Guide

conv2

convn