Compressing image data

摘要

Methods, systems, and computer programs for encoding and decoding image are described. In some aspects, an input data block and a prediction data block are accessed. A projection factor is generated based on a projection of the input data block onto the prediction data block. A scaled prediction data block is generated by multiplying the projection factor by the prediction data block. A residual data block is generated based on a difference between the input data block and the scaled prediction data block. In some aspects, a prediction data block, a residual data block, and a projection factor associated with the residual data block are accessed. A scaled prediction data block is generated by multiplying the projection factor by the prediction data block. An output data block is generated by summing the residual data block and the scaled prediction data block.

主权项

1. A non-transitory computer-readable storage medium storing instructions for decoding image data, the instructions operable when executed by data processing apparatus to perform operations comprising:
accessing a prediction data block including prediction data block values; accessing a residual data block including residual data block values; accessing a quantized projection factor associated with the residual data block; de-quantizing the quantized projection factor; generating summation data block values by summing the prediction data block values and corresponding residual data block values; and generating output data block values by multiplying the de-quantized projection factor by the summation data block values.