Video encoding method and device

Abstract

The invention discloses a video encoding method and device. The video encoding method comprises an I frame encoding module and a P frame encoding module, wherein the I frame encoding module is used for encoding down-sampling I frames and executing reconstruction and synthesis according to corresponding multiple down-sampling sub-frames to obtain reconstructed I frames with original resolution; and the P frame encoding module is used for encoding down-sampling P frames and executing reconstruction by asymmetric resolution motion compensation and residual up-sampling to obtain reconstructed P frames with the original resolution. Compared with the traditional method, the video encoding method disclosed by the invention has the advantages that encoding is executed by utilizing the down-sampling I frames and the down-sampling P frames, the original resolution of a video image is directly reduced before encoding, the prediction is carried out on the basis that resolution sub-frames are reduced, and the video images with the original resolution are reconstructed; therefore, operations on modules such as an intraframe prediction module, a motion estimation module, a mode selection module and the like which are most time-consuming in the process of video encoding are largely reduced, the calculation complexity of the video encoding is remarkably reduced, and the encoding efficiency under the condition of low bit rate is increased to some extent.

Description

technical field [0001] The invention belongs to the technical field of video processing, and in particular relates to a video encoding method and device. Background technique [0002] In the past few decades, the two major international organizations in the field of video, ISO-MPEG and ITU, have successively launched a series of video compression standards such as MPEG-1, MPEG-2 and MPEG-4 and H.261, H.263, H.263+, H.264 / AVC, etc. China also established the "Digital Video and Audio Codec Technology Standardization Working Group" in 2002, the AVS organization, which was completed in 2005 and has become a national standard. These standards have continuously improved video coding efficiency and promoted the development of the multimedia industry. [0003] Compared with the previous coding standards, H.264 / AVC has better coding efficiency, but correspondingly, its computational complexity is doubled, which poses a challenge to video codec terminals, especially embedded processi...

AI Technical Summary

Problems solved by technology

[0007] However, the I-frame coding method of the existing H.264 coding standard needs to calculate prediction values ​​in 9 different directions, the algorithm overhead is large, and the ability to remove data redundancy is weak, and the compression ratio is low

[0008] In addition, in the P frame coding of the existing H.264 coding technology, how to reduce the number of calls of these modules at the coding end is not fully considered, such as reducing the number of calls of the motion estimation and motion compensation modules, etc.

Therefore, the existing P frame encoding method has problems such as high computational complexity and large encoding time.

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