Method of Lossless Mode Signaling for Video System with Lossless and Lossy Coding

摘要

A method of efficient lossless mode syntax signaling for a coding system supporting both lossless and lossy coding is disclosed. In one embodiment, a first syntax element is incorporated in a picture level to indicate whether to use a forced lossless coding mode if lossless coding is allowed for the current picture. If the first syntax indicates that the forced lossless coding mode is selected, all coding units in the slices of the picture are coded using lossless coding. If the first syntax indicates that the forced lossless coding mode is not selected, each coding unit in a slice of the picture can be coded according to a second syntax element indicating whether each coding unit is coded using lossless coding or not. In another embodiment, the forced lossless mode can be applied to coding units on a slice by slice basis.

主权项

1. A method of lossless mode coding for a coding system supporting both lossy coding and lossless coding, wherein a picture is divided into multiple slices and each slice is divided into multiple coding units, the method comprising:
receiving input data associated with a current picture; if lossless coding is allowed for the current picture, incorporating or parsing a first syntax element in a picture level to indicate whether to use a forced lossless coding mode; if the first syntax indicates that the forced lossless coding mode is selected, encoding or decoding all coding units in the slices of the current picture using lossless coding; and if the first syntax indicates that the forced lossless coding mode is not selected, encoding or decoding each coding unit in each slice of the current picture according to a second syntax element indicating whether each coding unit is coded using lossless coding or not.