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Selection method and device for intra-frame predication mode

An intra-frame prediction mode and prediction mode technology, applied in the field of video coding, can solve the problems of increasing coding complexity and coding time, and achieve the effect of reducing complexity and simplifying the amount of data

Inactive Publication Date: 2015-07-01
BEIJING QIYI CENTURY SCI & TECH CO LTD
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Problems solved by technology

Although the intra prediction of exhaustive search improves the prediction accuracy, it also greatly increases the coding complexity and coding time

Method used

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  • Selection method and device for intra-frame predication mode
  • Selection method and device for intra-frame predication mode
  • Selection method and device for intra-frame predication mode

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Embodiment 1

[0048] refer to figure 1 , which shows a flow chart of the steps of an embodiment of a method for selecting an intra prediction mode according to the present invention, which may specifically include:

[0049] Step 101, down-sampling the encoding unit to obtain a corresponding sampling unit;

[0050] Since there is often a strong correlation in video image data, the closer the spatial distance between pixels is, the stronger their correlation will be. The present invention uses this correlation to simplify the coding unit, so that the amount of data that needs to be processed for the selection algorithm of the prediction mode will be greatly reduced, thereby reducing the complexity and operation time of the selection algorithm.

[0051] The present invention realizes the simplification of the coding unit by down-sampling the coding unit. In this way, performing intra-frame prediction on the sampling unit corresponding to the coding unit can reduce the workload of the selectio...

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Abstract

The embodiment of the invention provides a selection method and device for an intra-frame predication mode. The selection method for the intra-frame predication mode particularly comprises the following steps: carrying out lower sampling on an encoding unit to obtain a corresponding sampling unit; predicating the sampling unit by using one of a plurality of predication modes to obtain a corresponding predication unit; calculating a predication cost between each predication unit and the encoding unit; selecting the predication mode from the plurality of predication modes according to the predication cost of each predication unit; and calculating a corresponding rate-distortion cost aiming at the pre-selected predication mode, and selecting the optimal predication mode from the pre-selected predication mode according to the rate-distortion cost. According to the selection method, the complexity of an intra-frame predication mode selection algorithm can be reduced and the encoding efficiency is improved.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a method and device for selecting an intra-frame prediction mode. Background technique [0002] HEVC (High Efficiency Video Coding, high-efficiency video coding standard) is a new generation of video coding standard, which aims to solve people's increasing demand for visual and auditory quality. [0003] For video coding standards, an important component is predictive coding technology. The quality of prediction directly determines the effect of video coding, and the selection of prediction mode takes up a considerable amount of coding time. Therefore, how to quickly and accurately select the best mode from all prediction modes has always been a research hotspot. . [0004] Compared with the 9 intra prediction modes of H.264, in order to achieve better coding performance, the HEVC standard proposes 35 prediction modes, aiming to improve the accuracy of intra predic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/147H04N19/11H04N19/61
Inventor 朱洪波
Owner BEIJING QIYI CENTURY SCI & TECH CO LTD
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