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A Calculation Method of Lagrangian Factor Oriented to SATD

A calculation method and factor technology, applied in the field of video coding, can solve problems such as being unsuitable for calculating Lagrangian factors, and achieve the effects of high accuracy, low coding complexity, and improved coding efficiency.

Inactive Publication Date: 2019-03-26
XIAN UNIV OF TECH
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Problems solved by technology

The above methods all obtain the Lagrangian factor under the premise that the coding distortion measurement scale is SSE, and are not suitable for calculating the Lagrangian factor under the distortion measurement SATD

Method used

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  • A Calculation Method of Lagrangian Factor Oriented to SATD
  • A Calculation Method of Lagrangian Factor Oriented to SATD
  • A Calculation Method of Lagrangian Factor Oriented to SATD

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Embodiment Construction

[0053] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] The present invention is oriented to the SATD Lagrangian factor calculation method, and the specific calculation process is as follows figure 1 as shown,

[0055] Step 1, calculate the parameter δ:

[0056] For the residual block coefficient r of M×M size, the transformation matrix T is obtained after DCT transformation:

[0057]

[0058] Where A is a DCT matrix, then:

[0059]

[0060] in[·] u,u Represents the coefficient value at the (u,u) position in the matrix, and the symbol R' is defined as:

[0061]

[0062] The parameter ρ is used to measure the correlation between the pixel values ​​in the horizontal and vertical directions, and its value is set to 0.6; the parameter δ p It is used to represent the standard deviation of pixels in the residual block, which can be approximated by the mean absolute difference MAD: ...

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Abstract

The invention discloses a Lagrange factor calculation method for SATD. According to a rate distortion model of an encoder of limited entropy scalar quantization under a high-code-rate condition, an SSE-based Lagrange factor lambda mode is derived; Hadamard transformation has a feature of energy concentration, energy is mainly concentrated at the top left corner of a two-dimensional matrix, since the Hadamard transformation has similar features with DCT, Hadamard transformation residual errors are also described to be in Gauss distribution; and under the condition that a distortion measure is the SATD, the rate distortion model is obtained, and accordingly, a Lagrange factor lambda pre for the SATD is obtained. According to the invention, the Lagrange factor lambda pre is obtained through calculating parameters delta and delta h, the encoding complexity is quite low, and the encoding complexity is only 1% of that of a conventional algorithm; and the Lagrange factor lambda pre under the distortion measure SATD is obtained from the angle of a rate distortion theory, and the accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of video coding, and in particular relates to a SATD-oriented Lagrangian factor calculation method. Background technique [0002] The emergence and prevalence of "high pixel bit depth, high frame rate, and high resolution" videos have prompted more and more users to integrate into video services and experience unprecedented visual feasts. However, the huge amount of data also makes the storage and transmission of videos face severe challenges. The new generation of video coding standard HEVC (High Efficiency Video Coding, high-efficiency video coding) aims at the "large data volume of high-definition / ultra-high-definition video", adopting more advanced coding tools to flexibly and effectively represent video content, not only in terms of performance It saves a lot of transmission bandwidth and improves the subjective and objective quality of the video. It greatly expands the fineness of the content and pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/147H04N19/19H04N19/124H04N19/61
CPCH04N19/124H04N19/147H04N19/19H04N19/61
Inventor 李维张二虎赵凡范彩霞
Owner XIAN UNIV OF TECH
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