Abstract: A method of coregistering images is disclosed. Two dimensional images are first preprocessed, including clipping values in each image to a specified standard value range, and then applying a local equalization technique to the clipped images. Feature extraction is then performed to identify one or more features in the images. One or more of the extracted features are then matched between images to determine a degree of overlap between the images and a relationship between image coordinates of the images. The images are then transformed to a common coordinate system based on the degree of overlap and the relationship between their image coordinates. The images are then combined to form a single image.

Abstract: Devices, methods and techniques related to image rendering for ground-penetrating radar (GPR) systems are disclosed. In one example aspect, a method for producing one or more images associated with a GPR includes receiving information representative of signals received by the GPR, determining at least three frequency bands associated with the received information, assigning color values to the received information corresponding to the at least three frequency bands, and generating a color image for the one or more objects by combining the received information in all of the at least three frequency bands together such that the color values in the color image indicate a size of the one or more objects, a depth at which the one or more objects is buried underground, or an electrical permittivity of the one or more objects.