Patent ID: 11915435
Assignee: RAYTHEON COMPANY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method of image cross correlation, comprising:
a) correlating a first window in a first image to a second larger window in a second image to produce a correlation surface;
b) first extracting at least one first pair of correlation offsets X and Y from the correlation surface, said correlation offsets X and Y being real numbers including fractional portions capable of representing fractional offsets;
c) resampling the pixel values within the first window of the first image or the second larger window of the second image using only the fractional portions of the correlation offsets X and Y;
d) using the resampled pixel values to correlate the first window in the first image to the second larger window in the second image to produce a resampled correlation surface; and
e) extracting at least one final pair of correlation offsets X and Y from the resampled correlation surface, said at least one final pair of correlation offsets X and Y being real numbers including both non-zero fractional and non-zero integer portions.