Video compression using multiple variable length coding methods for multiple types of transform coefficient blocks

摘要

Classifying a series of quantized transform coefficients of a block of image data into one of a pre-defined plurality of classes for entropy coding, and entropy coding the block. A class is defined by at least the size of the block and typically but not necessarily one or more other factors. The classified series is coded by one of a set of pre-defined entropy coding methods, e.g., variable length coding methods for the pre-defined classes.

主权项

1. A method of processing, comprising:
obtaining an ordered series of quantized transform coefficients of a block of image data; classifying the ordered series of quantized transform coefficients in order to produce a classified series characterized by one or more pre-defined classes, wherein classification occurs at least in accordance with the size of the block of image data, the classifying including:
first-stage classifying the ordered series of quantized transform coefficients in order to produce a first-stage classified series having a first class of a plurality of pre-defined first classes, the first-stage classifying being according to the size of the block, andsecond-stage classifying the first-stage classified series in order to produce a classified series having the first class and further having a second class of one or more second classes pre-defined for the first class; and applying an entropy coding method to the ordered series of quantized transform coefficients in order to generate a sequence of codewords, wherein for at least two different pre-defined classes of ordered series of different sizes, different pre-defined entropy coding methods are applied to the different pre-defined classes.