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Name

acfnp - calculate the normalized autocorrelation function of an image using padding with zeroes and multiplication in Fourier space.

Usage

output = acfnp(image, center=True)

Input

image
input image (real)
center
if set to True (default), the origin of the result is at the center; if set to False, the origin is at (0,0), the option is much faster, but the result is difficult to use

Output

output
normalized autocorrelation function of the input image. Real. The origin of the autocorrelation function (term ccf(0,0,0)) is located at (int[n/2], int[n/2], int[n/2]) in 3D, (int[n/2], int[n/2]) in 2D, and at int[n/2] in 1D.

Method

Reference

Pratt, W. K., 1992. Digital image processing. Wiley, New York.

Author / Maintainer

Pawel A. Penczek

Keywords

category 1
FUNDAMENTALS
category 2
FOURIER

Files

fundamentals.py

Maturity

stable
works for most people, has been tested; test cases/examples available.

Bugs

None. It is perfect.