Interleaved encoding of compressed attribute and color planes

摘要

An example embodiment may involve obtaining an a×b pixel macro-cell from an image with one or more color planes, and an a×b attribute macro-cell. The a×b pixel macro-cell may contain 4 non-overlapping m×n pixel cells, and the a×b attribute macro-cell may contain 4 non-overlapping m×n attribute cells. The pixels in the a×b pixel macro-cell may be associated with respective color values. The example embodiment may also involve determining 4 attribute output values associated respectively with the 4 non-overlapping m×n attribute cells. The example embodiment may further involve determining 1 to 4 color-plane output values for the non-overlapping m×n pixel cells, and writing an interleaved representation of the 4 attribute output values and the determined color-plane output values.

主权项

1. A computer-implemented method comprising execution, by a processor, of operations including:
obtaining, from a memory, (i) a digital image containing one or more color planes, and (ii) an attribute plane, wherein the digital image comprises a plurality of non-overlapping a×b pixel macro-cells, pixels therein respectively associated with color values, and wherein the attribute plane comprises a plurality of non-overlapping a×b attribute macro-cells; applying compression to each of the a×b pixel macro-cells and the a×b attribute macro-cells, wherein applying the compression comprises:
selecting, from the digital image, a particular a×b pixel macro-cell that contains 4 non-overlapping m×n pixel cells, pixels of which are respectively associated in a one-to-one fashion with elements of a particular a×b attribute macro-cell that contains 4 non-overlapping m×n attribute cells, anddetermining (i) 4 attribute-plane output values respectively associated with the 4 non-overlapping m×n attribute cells, and (ii) 1 to 4 color-plane output values for the 4 non-overlapping m×n pixel cells; and storing, in the memory, a compressed representation of the digital image and the attribute plane, including therein an interleaved representation of (i) the 4 attribute-plane output values, and (ii) the 1 to 4 color-plane output values.