3D cross-correlation in matlab

Question

I need to calculate 3D cross-correlation in MATLAB. Anyone know which function I should use? For 2–D cross-correlation it has xcorr2, but I don\'t know about is

Answer 1

Correlation is similar to convolution except that one does not need to flip an input about the origin (but correlation needs taking the complex conjugate of one of the operands), so for 3D real matrices, you can use convn(x3d,y3d(end:-1:1,end:-1:1,end:-1:1)) to compute 3D cross correlation.