Method for Palette Table Initialization and Management

摘要

A method and apparatus for palette coding of a block of video data using a shared palette/palette prediction buffer are disclosed. The system receives a bitstream including compressed data associated with a current palette coded block and determines a palette predictor for the current palette coded block stored in a shared palette/palette predictor buffer. Reuse flags for entries of the current palette are used to update the current palette stored in the shared palette/palette predictor buffer. Any new signaled entry will be inserted to the shared palette/palette predictor buffer. An updated palette predictor for a next palette coded block is generated accordingly. A method of palette management and initialization for first palette-coded block in a high-level video structure is also disclosed. The high-level video structure may correspond to a slice, wavefront, sequence or picture.

主权项

1. A method of decoding a block of video data using palette coding in a video coding system, the method comprising:
receiving a bitstream including compressed data associated with a current palette coded block; determining a palette predictor for the current palette coded block stored in a shared palette/palette predictor buffer; parsing reuse flags for entries of the palette predictor from the bitstream indicating whether corresponding entries of the palette predictor are reused; after the reuse flags are decoded, updating the corresponding entries of the palette predictor stored in the shared palette/palette predictor buffer according to the reuse flags to cause one or more relocated reused-entries in the shared palette/palette predictor buffer; after said updating the corresponding entries of the palette predictor, inserting one or more signaled new entries to a position after a last relocated reused-entry in the shared palette/palette predictor buffer; after said inserting said one or more signaled new entries, generating an updated palette predictor by discarding any entries exceeding a maximum palette predictor size; and constructing a current palette by selecting beginning N entries of the shared palette/palette predictor buffer, wherein N is an integer larger than 0.