Methods and systems for scalable-to-non-scalable bit-stream rewriting

摘要

Aspects of the present invention relate to systems and methods for selectively determining a quantization parameter based on coding parameters. In some embodiments, a quantization parameter selection may be based on the presence of non-zero transform coefficients as well as other parameters. Some embodiments relate to rewriting a multi-layer bitstream to a single-layer bitstream with a quantization parameter selected with reference to transform coefficients. Some embodiments convert a scalable, multi-layer video sequence into a single-layer, non-scalable video sequence that is compatible with legacy devices.

主权项

1. A method for image bitstream processing, said method comprising:
extracting symbols from a multi-layer image bitstream, said symbols being related to an image portion; generating combined transform coefficients from said symbols, wherein said combined transform coefficients are a combination of enhancement layer coefficients and base layer coefficients; determining whether said combined transform coefficients comprise any non-zero coefficients; when said combined transform coefficients comprise a non-zero coefficient, using a quantization parameter identified in said symbols for processing said image portion; and when said combined transform coefficients do not comprise a non-zero coefficient, using a default quantization parameter, wherein said default quantization parameter is a quantization parameter used for a previous image portion, for processing said image portion.