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Enhancement layer residual prediction for bit depth scalability using hierarchical luts

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

Active Publication Date: 2009-04-22
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Doing so is less efficient both in terms of compression ratio and operational complexity

Method used

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  • Enhancement layer residual prediction for bit depth scalability using hierarchical luts
  • Enhancement layer residual prediction for bit depth scalability using hierarchical luts
  • Enhancement layer residual prediction for bit depth scalability using hierarchical luts

Examples

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Embodiment approach

[0085] inv_tone_map_delta_flag equal to 1 indicates that there is a delta value to add to the inverse tone map specified in the sequence parameter set (SPS) in inter-layer prediction.

[0086] level_lookup_table_luma_minus8 plus 8 indicates the level of the lookup table for the Y channel.

[0087] offset_val_lookup_table_luma_delta[i] specifies the delta value s[i] to be added to the value specified in the SPS, to which delta value s[i] level i in the lookup table for the Y channel is mapped as follows:

[0088] If i is not equal to 0, then s[i] is equal to s[i-1] plus offset_val_lookup_table_luma_delta[i]. Otherwise, s[i] is equal to offset_val_lookup_table_luma_delta[i].

[0089] A chroma_inv_tone_map_delta_flag equal to 1 indicates that there is a delta value to add to the inverse tone map specified in the SPS in inter-layer prediction for Cb and Cr channels.

[0090] level_lookup_table_chroma_minus8 plus 8 indicates the level of LUT for Cb and Cr channels.

[0091] offs...

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Abstract

The invention discloses a method for the predication of residual error of classified-LUT-used and bit-depth-scalable enhanced layer. The scalable video bit stream may have H264 / AVC compatible basic layer and scalable enhanced layer, wherein the scalability relates to the color bit depth. According to the invention, BL information carries out bit depth up-sampling using single search table mapped by reverse tone on two or more levels which are image level, image bar level and MB level. The search table is carried out differential coding and contained in the head information. The process of the bit depth up-sampling (BDUp) is as follows: the process enhances the number of the value of each pixel and relative to the colour intensity of the pixel. Based on the search table, the data of the basic layer after the up-sampling is used for predicting the enhance layer in the relative position. The up-sampling is finished at a coder, and a decoder by the same mode, wherein the up-sampling relates to time, space and bit depth. Therefore, the bit depth up-sampling (BDUp) is compatible with the texture up-sampling (TUp).

Description

technical field [0001] The invention relates to the technical field of digital video coding. The present invention discloses a coding scheme for bit-depth scalability of color. Background technique [0002] In recent years, high color depths other than traditional eight-bit color depths have been increasingly desired in many fields, such as scientific imaging, digital cinema, high-quality video projection computer games, professional studios, and home theater-related applications . Accordingly, the current state-of-the-art video coding standard H.264 / AVC already includes Fidelity Range Extension (FRExt), which supports sampling rates up to 14 bits per sample and up to 4:4:4 chroma. The current SVC reference software JSVM does not support high bit depths. [0003] However, no existing advanced coding scheme supports bit-depth scalability compatible with other scalability types. For the situation of two different decoders, or the situation of clients with different bit-dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N11/04H04N19/50
CPCH04N19/00424H04N7/462H04N7/50H04N19/00448H04N19/00442H04N7/26351H04N19/00781H04N19/30H04N19/61H04N19/577H04N19/34H04N19/36H04N19/42
Inventor 武宇文高永英
Owner INTERDIGITAL CE PATENT HLDG
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