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HDR (High Dynamic Range) video preprocessing method

A preprocessing and video technology, applied in the field of video coding, can solve the problems of loss of details, large quantization step used, high complexity, etc., and achieve the effect of small distortion, good subjective quality and small quantization step size

Active Publication Date: 2017-09-22
HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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Problems solved by technology

Traditional saliency detection is usually processed based on the R, G, and B components of the image, and the complexity is high, which is not suitable for efficient real-time video processing. Therefore, how to perform fast saliency detection is a necessary means for perceptual video coding
[0011] The existing PQ model only considers the influence of absolute brightness on perceptual redundancy, and does not consider the area of ​​human visual attention. If the absolute brightness of the area of ​​human visual attention is small, the quantization step size used is also large, making details more serious loss

Method used

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  • HDR (High Dynamic Range) video preprocessing method

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Embodiment Construction

[0044] The present invention will be further described below in combination with specific embodiments.

[0045] A kind of HDR video preprocessing method, comprises the steps:

[0046]Step 1: In the YUV domain, fast saliency detection is carried out for the video characteristics of HDR's wide brightness and wide color gamut, so that highlighted areas and areas with obvious colors are further distinguished;

[0047] Specifically take the following steps:

[0048] (1) Extract the luminance saliency value L for the luminance component Y Sal (i):

[0049] L Sal (i)=|Y(i)-Y Avg |

[0050] Among them: i represents the i-th pixel in the current frame, Y(i) represents the brightness value of the i-th pixel in the current frame, Y Avg Represents the average brightness of all pixels in the current frame;

[0051] (2) Extract the chroma saliency value C for the chrominance components U and V Sal (i):

[0052] C Sal (i)=|U(i)-U Aug |+|V(i)-V Avg |

[0053] Among them: U(i) rep...

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Abstract

The invention discloses a HDR (High Dynamic Range) video preprocessing method. The HDR video preprocessing method comprises the following steps of: (1) in a YUV range, for video characteristics of a wide brightness and a wide color gamut of a HDR, carrying out rapid significance detection so as to further distinguish a high-brightness region and a region obvious in color; and (2) constructing a significance-perception quantification function, fusing significance characteristics with an existing perception quantification model, so that a quantification step size when a relatively significant region in a video is quantified is smaller, and more rich image details are reserved. The HDR video preprocessing method has the beneficial effects that the quantification step size used when the region obvious in bright and color in the HDR video is quantified is smaller, distortion is relatively small, subjective quality is higher, and more completed image details are reserved, so that integral video quality further accords with the human eye perception characteristics.

Description

technical field [0001] The present invention relates to the technical field related to video coding, in particular to a HDR video preprocessing method. Background technique [0002] With the rapid development of video image technology, people have higher and higher requirements for video viewing experience. Keywords such as 3D, 4K, wide viewing angle and HDR (High Dynamic Range) have become hot spots in the TV market. Compared with traditional SDR (Standard Dynamic Range, standard dynamic range) TVs, HDR TVs can display wider brightness and more colors, and show the real content of the video more abundantly, which is very shocking to the human eye . [0003] The color gamut standard used by traditional SDR video is BT.709, which may cause highlight overflow (loss of highlight details to ensure normal exposure of dark parts)) or shadow clipping (loss of dark part details to ensure normal exposure of high-brightness scenes) , while the color gamut standard ST.2084 in HDR ca...

Claims

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Application Information

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IPC IPC(8): H04N17/00H04N19/154H04N19/186
CPCH04N17/004H04N19/154H04N19/186
Inventor 廖义黄进王建伟
Owner HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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