Processing graphical data representing a sequence of images for compression

摘要

A method for processing graphical data representing a sequence of images prior to compression, including analyzing a plurality of adjacent areas of an image from the sequence to determine: (i) a first set of areas, each of which includes changes when compared with a corresponding area in a previous image from the sequence; and (ii) a second set of areas, each of which does not include a change when compared with a corresponding area in the previous image. For each area of the second set, a section of the area is replaced with a block chosen to reduce the size of the graphical data once compressed, while leaving the original image of the area of the second set adjacent any part of the perimeter that adjoins an area of the first set. A dataset is provided to allow identification of the areas of the second set. On decompression of the compressed graphical data, the dataset is accessed and the image is processed by replacing each area of the second set with the corresponding area from a previous image. A system for processing the graphical data according to the steps set out above is also provided.

主权项

1. A method for processing graphical data representing a sequence of images for compression, including:
analysing a plurality of adjacent areas of an image from the sequence to determine: (i) a first set of areas, each of which includes changes when compared with a corresponding area in a previous image from the sequence; and (ii) a second set of areas, each of which does not include a change when compared with a corresponding area in the previous image; for each area of the second set, replacing a section of the area with a block chosen to reduce the size of the graphical data once compressed, while leaving the original image adjacent any part of the perimeter of the area of the second set that adjoins an area of the first set; providing a dataset allowing identification of the areas of the second set; and compressing the second set of areas, processed as set out above, and the first set of areas, as a single image.