Frame buffer compression for video processing devices

摘要

For compressing a video signal, a local multiscale transform is applied to a frame of the video signal to obtain coefficient blocks. The coefficients of each block are distributed into coefficient groups associated with that block. A plurality of the coefficient groups associated with a block are processed. The processing of one of the groups comprises determining an exponent for encoding the coefficients of that group. Mantissas are determined for quantizing the coefficients of the plurality of groups in combination with the exponents respectively determined for these groups. Coding data including each exponent determined for a coefficient group and the mantissas quantizing the coefficients of the group in combination with this exponent are stored in an external frame buffer. The mantissas determined for quantizing the coefficients of one of the groups are represented in the coding data by a respective number of bits depending on the exponents determined for the plurality of coefficient groups.

主权项

1. A method of compressing a video signal, comprising:
applying a local multiscale transform to a frame of the video signal to obtain coefficient blocks; distributing the coefficients of each block into coefficient groups associated with said block; processing a plurality of the coefficient groups associated with a block, wherein the processing of one of the groups comprises determining an exponent for encoding the coefficients of said one of the groups, and wherein the processing of the plurality of coefficient groups comprises determining mantissas for quantizing the coefficients of each group in the plurality of groups in combination with the exponents respectively determined for said groups; and storing coding data including each exponent determined for a coefficient group and the mantissas quantizing the coefficients of said group in combination with said exponent, wherein the mantissas determined for quantizing the coefficients of one of the groups are represented in the coding data by a respective number of bits depending on the exponents respectively determined for said plurality of coefficient groups.