Method and apparatus for data compression using error plane coding

摘要

A method and apparatus of image data compression and decompression are disclosed. According to an embodiment of the present invention, the compression method partitions the image data into access units and encodes each access unit into a bitstream according to a target bit budget. Each access unit is encoded using first data compression to generate a first bitstream and the residual data is further encoded using second data compression to generate a second bitstream if the first bitstream is smaller than the target bit budget. In one example, the second data compression comprises bit plane coding applied to bit plane-ordered data, wherein the bit plane-ordered data is generated by scanning from a most significant bit to a least significant bit of the residual data in a bit plane-wise order. The decompression method comprises steps to recover reconstructed data from the first and second bitstreams.

主权项

1. A method of image data compression for compressing frame or image buffer in an image or video coding system, the method comprising:
receiving image data to be stored in the frame or image buffer, wherein the image data is partitioned into a plurality of access units; applying first data compression to each access unit to generate a first bitstream for the access unit, wherein size of the first bitstream is smaller than or equal to a target bit budget for the access unit; in response to result of the first data compression, applying second data compression to residual data of the access unit to generate a second bitstream for the access unit, wherein the residual data corresponds to first differences between original image data of the access unit and first reconstructed image data corresponding to the first data compression of the access unit; providing the first bitstream for storing in the frame or image buffer; and providing the second bitstream for storing in the frame or image buffer if the second bitstream exists.