Patent ID: 11790560

Abstract:
Methods and decompression units for decompressing data from a compressed block of image data, the compressed block of image data representing a block of image data comprising a plurality of image element values, the image element values being divisible into at least a first value and a second value such that the block of image data comprises a two-dimensional block of first values. The method comprises: analysing a header of the compressed block of image data to identify (i) a location in a body of the compressed block of image data of a fixed-length parameter that corresponds to a first desired value in the two-dimensional block of first values, and (ii) common base information for the first desired value, the common base information being common to a first set of values comprising all of the two-dimensional block of first values or a portion of the two-dimensional block of first values that includes the first desired value; retrieving the fixed-length parameter that corresponds to the first desired value from the identified location in the body of the compressed block of image data; and generating the first desired value from the common base information and the fixed-length parameter.