COMPRESSION AND DECOMPRESSION OF IMAGES Russian patent published in 2012 - IPC H04N7/26 H04N7/64 

FIELD: information technology.

SUBSTANCE: pixel clusters are specified for use when compressing and decompressing an image. Image information used to specify clusters may include pixel values in a predetermined position relative the pixel or corresponding motion vectors, gradients, texture etc. When compressing images, image information with respect to pixels is analysed to determine the cluster to which it belongs. For each cluster, a set of control parameters is calculated for a post-processing operation, e.g., filter coefficients for filtering or statistical data for local generation of texture. The set of control parameters is selected depending on image content. The compressed image and the sets of control parameters are transmitted to a decompressing device. After decompression, image information, which is a decompressed image, is analysed for classification of pixels according to clusters, and different sets of control parameters for selected clusters are used to control post-processing in pixel positions.

EFFECT: abating compression artefacts.

14 cl, 30 dwg