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Video encoding method and video decoding method for enabling bit depth scalability

A bit-depth, coding technology, applied in the field of digital video coding, can solve problems such as low efficiency of computational complexity

Inactive Publication Date: 2010-01-06
INTERDIGITAL VC HLDG INC
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  • Abstract
  • Description
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Problems solved by technology

Inefficient for both compression ratio and computational complexity

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  • Video encoding method and video decoding method for enabling bit depth scalability

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Embodiment Construction

[0007] figure 1 The framework diagram of the proposed color bit-depth scalable coding is shown in . exist figure 1 In , two videos will be used as input for video encoding: N-bit original video and M-bit (usually 8-bit) video (N>M). M-bit video can be converted from N-bit original video or given by other methods.

[0008] With the built-in H.264 / AVC encoder, M-bit video is encoded as BL. Using a scalable encoder, N-bit video is encoded as EL. By exploiting the information of BL, the coding efficiency of EL can be significantly improved. We refer to the utilization of BL information in encoding EL as inter-layer prediction. Each picture—a group of macroblocks (MBs)—will have two access units, one for the BL and one for the EL. The encoded bitstream will be multiplexed to form a scalable bitstream.

[0009] During decoding, the BL decoder will only use the BL sub-bitstream extracted from the full bitstream to provide M-bit reconstructed video. By decoding the entire bits...

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Abstract

The invention presents a scalable solution to encode the whole 12-bit raw video once to generate one bitstream that contains an H.264 / AVC compatible base layer and a scalable enhancement layer. If a color bit depth scalable decoder is available at the client end, both the base layer and the enhancement layer sub-bitstreams will be decoded to obtain the 12-bit video and it can be viewed on a high quality display that supports more than eight bit; otherwise only the base layer sub-bitstream is decoded using an H.264 / AVC decoder and the decoded 8-bit video can be viewed on a conventional 8-bit display. The enhancement layer contains a residual based on a prediction from the base layer, which is either based on bit-shift or based on an advanced bit depth prediction is utilized, wherein the advanced bit depth prediction method is a Smoothed Histogram method or a Localized Polynomial Approximation method.

Description

technical field [0001] The invention relates to the technical field of digital video coding. The present invention proposes a technical solution for the latest type of scalability—bit depth scalability. Add proposed new syntax elements and semantics to support bit depth scalability. Background technique [0002] In recent years, in many areas such as scientific imaging, digital cinema, computer games that can display high-quality video, and related applications in professional studios and home theaters, there has been an increasing need for higher bit color depths, rather than the traditional eight-bit color depth. Consequently, the state-of-the-art video coding standard - H.264 / AVC - already includes Fidelity Range Extensions, which support up to 14-bit samples and up to 4:4:4 chroma sampling. [0003] However, none of the existing high-bit encoding solutions support color bit-depth scalability. Assume a situation where we have 2 different decoders (or clients with dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N7/26351H04N19/00781H04N7/50H04N19/00884H04N7/26313H04N19/00321H04N7/26297H04N19/00024H04N7/26015H04N7/26946H04N19/00545H04N19/105H04N19/187H04N19/30H04N19/46H04N19/61H04N19/70
Inventor 高永英武宇文
Owner INTERDIGITAL VC HLDG INC
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