Patent ID: 11941878
Assignee: RAYTHEON COMPANY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 10:
11. A computer-implemented method of automated road network identification, said computer programmed to implement the steps of:
receiving a single multi-band image including a first set of band images and a second set of band images collected with a time lag relative to the first set;
forming first and second pseudo-pan images as a weighted average of one or more band images in the first set and a weighted average of one or more band images in the second set, respectively;
exploiting the time lag between the first and second pseudo pan images to detect moving vehicles in the single multi-band image by
segmenting the first pseudo-pan image into a plurality of local template windows;
correlating each local template window to a larger search window in the second pseudo-pan image to produce a correlation surface;
extracting X and Y correlation offsets from the correlation surface for each template window;
rejecting correlations where X and Y correlation offsets are less than a first threshold;
computing a Figure of Merit (FOM) for each of the correlations; and
removing correlations whose FOM is less than a second threshold whereby any remaining correlations identity the moving vehicles;

using the detected moving vehicles to extract pixel values from the single multi-band image at pixels adjacent to locations of detected moving vehicles to characterize at least one image-specific spectral roadway signature; and
searching the single multi-band image to match the at least one image-specific spectral roadway signature to pixel values for each of the bands for groupings including at least one pixel to grow a road network map.