COHERENCE CHANGE DETECTION TECHNIQUES

摘要

Techniques for determining coherency between composite images having phase and amplitude components are disclosed. The coherency can be determined based on the amplitude components of the images, by providing first (42) and second amplitude images (43) indicative of amplitude values of pixels of a respective first and second composite images, applying to each of the first and second amplitude images a first directional derivative operator and a second directional derivative operator, thereby generating (44) for each of the amplitude images respective first directional derivative image and second directional derivative image thereof, and generating a first coherency map (47) based at least on the directional derivative images of the first and second amplitude images. The first coherency map is indicative of decorrelation between the first and second composite images.