Rapid shake detection using a cascade of quad-tree motion detectors

摘要

A method of determining stability of a camera comprises capturing an image with the camera and then (A) determining a magnitude of motion for each region of a current sub-division of the image. A step (B) then determines a number of the magnitudes of motion not larger than a magnitude threshold associated with the current sub-division, and where the determined number is greater than or equal to a region threshold associated with the number of regions in the current sub-division, (i) determining the camera to be stable, or otherwise (ii) dividing the current sub-division of the image into a further sub-division and repeating steps (A) and (B) upon the further sub-division.