Patent ID: 7805024
Filing Date: 2010-09-28
Classification: H04N

Abstract:
1. A method, comprising: selecting one file of a plurality of image data files, each image data file containing image data representing an image, as a base file; selecting as a target file an image data file that is a contextually-related file to the base file using supplemental information other than image content; comparing the target file and the base file to determine differences therebetween, wherein comparing the target file comprises comparing the image data in the target file and image data in the base file on a block-by-block basis, each of the blocks comprising a plurality of pixels, and determining mismatches between selected blocks in the target file and selected blocks in the base file, the determining using a cost function calculated using a reduced number of pixel locations in the selected blocks relative to an exhaustive search that uses all pixel locations in the selected blocks; and storing the target file as a reduced file that is a representation of differences between the image data of the target file and the image data of the base file.