method and apparatus for transform coding with block level transform selection and implicit signaling within hierarchical partitioning

摘要

The present invention relates to a method (700) for encoding a source image (101) into an output bit stream (114) using quantized transform coefficients (112), comprising: - obtaining (701) from from source image (101, 301), input data (303) located in a transform block (tu), - transform (702) according to a transform type selected from a set of transform types (305) , 310), the input data (303) in transform coefficients (110, 306, 311), - quantifying (703) the transform coefficients (110, 306, 311) to generate the quantized transform coefficients (112, 308 313), - generating index information (704) adapted to identify the type of transform selected from the set of transform types (305, 310), - determining (705) information to be hidden, wherein the information to be hidden is at least part of the index information, and - hide (706) the information to be hidden a in the quantized transform coefficients (112, 308, 313).