Prediction mode selection method and device

A technology of prediction mode and intra-frame prediction mode, applied in the field of video coding, can solve the problems of large amount of calculation and time-consuming of rate-distortion cost, and achieve the effect of reducing the amount of calculation and time-consuming

Active Publication Date: 2015-09-09
TENCENT TECH (BEIJING) CO LTD
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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: due to the need to calculate the rate-distortion cost in each prediction mod

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  • Prediction mode selection method and device

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] First, several nouns involved in this embodiment are briefly introduced:

[0028] Image frame: A video consists of several image frames. Video compression coding generally adopts a block-based coding method, that is, a video image frame is divided into multiple non-overlapping blocks, and then these blocks are coded. Each image frame may adopt an inter-frame predictive coding method or an intra-frame predictive coding method during video coding.

[0029] In the HEVC standard, the concepts of coding unit, prediction unit and transformation unit are proposed.

[0030] Coding unit: It is the basic unit for coding in an image frame. A coding unit may be a 64*64 pixel block.

[0031] Prediction unit: It is the basic unit for pred...

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Abstract

The invention discloses a prediction mode selection method and device, and belongs to the field of video coding. The method comprises the steps: respectively calculating the rate-distortion costs Jskip, Jmerge and J2N*2N when a current prediction unit employs an inter-frame skip mode, an inter-frame merge mode and an inter-frame J2N*2N mode; detecting whether the rate-distortion cost Jskip is less than the rate-distortion costs Jmerge and J2N*2N or not; setting the rate-distortion cost Jskip as a candidate rate-distortion cost Jmode when the rate-distortion cost Jskip is less than the rate-distortion costs Jmerge and J2N*2N; calculating a rate-distortion cost Jintera when the current prediction unit employs at least one inter-frame prediction mode; and selecting the prediction mode with the minimum rate-distortion cost from the rate-distortion costs Jmode and Jintera. The method and device skip the rate-distortion cost calculation process of other seven inter-frame prediction modes when the inter-frame skip mode is better, and can effectively reduce the time consumption of prediction mode selection.

Description

technical field [0001] The present invention relates to the field of video coding, in particular to a prediction mode selection method and device. Background technique [0002] In the HEVC (High Efficient Video Coding, high-efficiency video coding) standard, a concept of a prediction unit (Prediction Unit, PU for short) is proposed. The prediction unit is the basic unit for inter prediction and intra prediction. [0003] In the HEVC standard, several inter-frame prediction modes and several intra-frame prediction modes are provided for selection. In order to find the optimal prediction mode, the prior art needs to calculate the rate-distortion cost of the current prediction unit in each prediction mode, and select the prediction mode with the smallest rate-distortion cost as the final prediction mode. [0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: due to the need to calculate the rate-d...

Claims

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Application Information

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IPC IPC(8): H04N19/109H04N19/11H04N19/147H04N19/61
Inventor 周俊明简伟华侯慧慧
Owner TENCENT TECH (BEIJING) CO LTD
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