MIXED MODE FOR FRAME BUFFER COMPRESSION

摘要

Certain aspects relate to systems and techniques for compressing image data using mixed mode compression schemes. A mixed mode compression scheme can reduce the amount of data stored in a frame buffer to reduce power costs of an image display system. In some implementations, mixed mode compression can be suitable for compression of pixel blocks having one or two color channels exhibiting a relatively low variation in pixel intensity with the remaining channel or channels exhibiting a relatively high variation. The pixel values in each color channel of an RGB or YCoCg image can be analyzed to determine how many channels are a smooth component and how many channels are a variant component, and mixed mode compression can be selected and implemented based on the color channel analysis to adaptively and individually compress the color channels.

主权项

1. A system in an electronic device for compressing image data, the system comprising:
a channel analysis module configured to
receive a pixel block comprising a plurality of components, at least some of the plurality of components corresponding to a color channel of the pixel block;determine whether the pixel block is a mixed block by comparing values associated with each of the plurality of components to at least one threshold and assigning a classification of either smooth or variant to at least some of the plurality of components based on the at least one threshold, a mixed block being a pixel block having:
at least one component assigned the smooth classification, andall of the plurality of components in the mixed block assigned the classification of either smooth or variant; and a mixed mode compression module configured to compress the pixel block using mixed encoding based at least partly on the assigned component classifications.