| 摘要 |
A method of compressing a frame of pixel tiles comprises receiving a frame of pixel tiles, determining a bandwidth available for each pixel tile, and for each colour channel of each pixel tile performing a transform of the pixel data to create a series of coefficients, selecting a quantization level from a set of predetermined quantization levels according to a function of the determined bandwidth and the size of the coefficients, and performing a quantization of the series of coefficients using the selected quantization level. In a preferred embodiment, the selection of the quantization level comprises mapping the coefficient size to one of a plurality of predetermined stages and using a quantization level pre-assigned to the mapped stages. |
