Prediction mode selection method and device

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...

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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 mode, and the calculation amount of the rate-distortion cost is relatively large, the selection process of the prediction mode requires More time-consuming, accounting for 60% to 70% of the entire coding process

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