Correction of defocusing using the co-occurrence matrix and the structure function

We show an approach to the correction of defocusing in stacks of images of 3D scenes using the second order moment of the co-occurrence matrix, a concept similar to that of the structure function used in scattering and Brownian motion. The local value of these functions shows a clear maximum in the regions of correct focus. The concepts are applied to simulations, to actual plane images and to 3D scenes.