Prediction method and prediction device for video image component

A technology of video image and prediction method, applied in the field of video, can solve the problems of increased cost and high complexity of hardware implementation, and achieve the effect of reducing complexity and improving coding performance

Active Publication Date: 2013-10-30
HUAWEI TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0003] However, the complexity of hardware implementation in the related i

Method used

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  • Prediction method and prediction device for video image component
  • Prediction method and prediction device for video image component
  • Prediction method and prediction device for video image component

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0229] pY'[x, y]=(recSamplesL[2x-1, 2y+1]+

[0230] 2*recSamplesL[2x, 2y+1]+recSamplesL[2x+1, 2y+1]+2)>>2,

[0231] where {(x, y)|x=Dx,..., nS+Dx-1; y=-1}

[0232] (2.30.1)

[0233] pY'[x, y]=(recSamplesL[2x-1, 2y]+recSamplesL[2x-1, 2y+1]+

[0234] recSamplesL[2x, 2y]+recSamplesL[2x, 2y+1]

[0235] +recSamplesL[2x+1, 2y]+recSamplesL[2x+1, 2y+1])>>2,

[0236] where {(x,y)|x,y=0,...,nS-1}

[0237] (2.31.1)

[0238] pY'[x, y]=(recSamplesL[2x-1, 2y]+recSamplesL[2x-1, 2y+1]+

[0239] recSamplesL[2x, 2y]+recSamplesL[2x, 2y+1]

[0240] +recSamplesL[2x+1, 2y]+recSamplesL[2x+1, 2y+1])>>2,

[0241] where {(x,y)|x=-1; y=Dy,..., nS+Dy-1} (2.32.1)

[0242] In formula (2.30) to formula (2.32), {(x, y)|x=Dx, ..., nS+Dx-1; y=-1} represents the adjacent sampling point above the current chrominance component image block , and the leftmost sampling point is offset by Dx pixels in the horizontal direction from the origin, and {Dx=0, ±1, ±2, . . . , ±(2*nS)}. When Dx>0, the upper and up...

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Abstract

Embodiments of the present invention provide a method and a device for predicting video image components. The method comprises: obtaining a luminance component value of an image block; obtaining a first numerical value a3 through a linear regression technology based on a luminance component value and a chrominance component value of a sampling point in an application template, changing numerical precision after compensating the first numerical value a3 so as to obtain a first parameter alpha and a third parameter k; obtaining a second parameter beta of a linear model based on the first parameter alpha and the third parameter k; obtaining a predicted value of a chrominance component of the image block through the linear model based on the luminance component value of the image block, the first parameter alpha, the third parameter k and the second parameter beta. The technical solution enhances encoding performance by improving a parameter in the linear model used at the time of predicting the video image components, and meanwhile lowers complexity of the device using the predicting method.

Description

technical field [0001] The present invention relates to the field of video, and more particularly, to a method and device for predicting video image components. Background technique [0002] Existing video image coding and decoding technologies include intra-frame coding technology and inter-frame coding technology. Intra-frame coding refers to the technique of compressing and coding image content by using only the spatial correlation in the currently coded image. Inter-frame coding refers to the technique of compressing and coding the current image by using the temporal correlation between the currently coded image and the coded image. In order to improve the intra-frame coding efficiency of images, international video coding standards, such as H.264 / AVC (Advanced Video Coding, advanced video coding), introduce intra-frame prediction technology to remove the spatial information between the current coded image block and the adjacent coded image blocks redundancy. Therefor...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/593
CPCH04N7/34H04N19/186H04N19/593H04N19/85
Inventor 杨海涛张星宇區子廉
Owner HUAWEI TECH CO LTD
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