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Method, encoder, decoder and system for enhancing bit depth of video signal

A video signal and encoder technology, applied in the field of SDR bit depth enhancement, can solve problems such as EDR stream generation artifacts

Active Publication Date: 2021-07-20
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, even considering residuals, the resulting EDR stream may generate artifacts, such as banding or blocks, usually in dark areas and in highlights

Method used

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  • Method, encoder, decoder and system for enhancing bit depth of video signal
  • Method, encoder, decoder and system for enhancing bit depth of video signal
  • Method, encoder, decoder and system for enhancing bit depth of video signal

Examples

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example 1

[0146] Example 1 - Low codeword clipping

[0147] Figures 7A-7G An example of CRA in which low codeword values ​​are clipped is shown.

[0148] Figure 7A The initial 16-bit SDR value is shown relative to the pixel position.

[0149] Figure 7B 8-bit SDR values ​​are shown relative to pixel position. A quantized 8-bit SDR signal is generated from the original 16-bit SDR, and this 8-bit SDR will be compressed in the BL encoder.

[0150] Figure 7C The predicted 16-bit SDR values ​​are shown relative to pixel location. The prediction module can be a piecewise polynomial of degree 2. The prediction module may clip signals below and / or above the threshold(s). In this case, it clips values ​​below the threshold, so values ​​become constant within regions (eg, dark shadows).

[0151] Figure 7D Residual mask values ​​are shown relative to pixel location. Since enhancement of BL codewords above the threshold will increase the bit rate beyond what is needed, those regions wi...

example 2—

[0155] Example 2 - High and Low Codeword Clipping

[0156] Figures 8A-8G An example of a CRA is shown in which both low and high codeword values ​​are clipped.

[0157] Figure 8A The initial 16-bit SDR value is shown relative to the pixel position.

[0158] Figure 8B 8-bit SDR values ​​are shown relative to pixel location. A quantized 8-bit SDR signal is generated from the original 16-bit SDR, and this 8-bit SDR will be compressed in the BL encoder.

[0159] Figure 8C The predicted 16-bit SDR values ​​are shown relative to pixel location. The prediction module can be a piecewise polynomial of degree 2. The prediction module may clip signals below and / or above the threshold(s). In this case, it clips the values ​​below the low threshold and above the high threshold, so the values ​​become constant in two regions (one dark, one bright), where one constant value is used for the dark region, and the other A constant value is used for bright areas.

[0160] Figure 8...

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Abstract

Novel methods and systems are disclosed for encoding standard dynamic range video to improve the final quality after converting standard dynamic range video to enhanced dynamic range video. A two-layer codec structure that amplifies certain codeword ranges can be used to send enhanced information to the decoder in order to achieve an enhanced (higher bit depth) image signal. The enhanced standard dynamic range signal can then be up-converted to enhanced dynamic range video that is free of banding artifacts in regions corresponding to those certain codeword ranges.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 62 / 198,073, filed June 28, 2015, which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to improvements for upconverting standard dynamic range (SDR) video to enhanced dynamic range (EDR) video. More particularly, it relates to methods and systems for SDR bit depth enhancement. Background technique [0004] Display technologies being developed by Dolby Laboratories, Inc. and others are capable of reproducing images with high dynamic range (HDR). Such displays can reproduce images that more faithfully represent real-world scenes than conventional displays featuring a dynamic range of about three orders of magnitude (eg, Standard Dynamic Range - "SDR"). [0005] Dynamic range (DR) is the range of intensities (eg, brightness, luma) in an image, eg, from darkest dark to brightest light. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/30H04N19/17H04N19/117
CPCH04N19/30H04N19/117H04N19/17H04N19/103H04N19/159H04N19/184
Inventor 苏冠铭
Owner DOLBY LAB LICENSING CORP
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