Signature-based video redirection

摘要

A method for detecting changes in a sequence of images includes dividing each of the images into tiles, each tile including a group of pixels. A tile signature representing the pixel values of the pixels of a given tile using a single numerical value is defined, such that a change in the signature is indicative of a change in at least one of the pixel values of the pixels of the given tile. Reference signatures of the tiles of a first image in the sequence are computed and stored. Current signatures of the tiles of a second image in the sequence are computed. An indication of changed tiles in the second image with respect to the first image is outputted by comparing the respective current signatures to the respective reference signatures of the tiles.