Method for quick inter-frame transcoding from H. 264/AVC standard to HEVC standard and transcoder thereof

Abstract

The invention discloses a method for quick inter-frame transcoding from H. 264 / AVC standard to HEVC standard. The method comprises the following steps: imbedding an H.264 / AVC standard code stream into a decoder for decoding, abstracting various information of subblocks during a decoding process, converting extracted information of the subblocks into CU and PU information for HEVC standard in ways of direct correspondence and small blocks forming large blocks, and finally using CU and PU information in HEVC standard coding directly. Since definite CU and PU information is available, quadtree division of CU, performed according to original encoding mode, is not required, ergodic of all possible PU modes under the depth of each CU is not required, and all that is needed is to calculate a PU mode and an intra-frame predicting mode under the depth of a corresponding CU. Therefore, calculating complexity in quadtree division of CU and ergodic under PU mode during transcoding is avoided. According to the transcoding method in the invention, the coding calculation complexity and coding time can be lowered and reduced considerably under the condition of very small loss of bit rate and video quality.

Description

technical field [0001] The invention relates to the technical problem of transcoding between video coding standards in the field of image communication, in particular to an inter-frame transcoding method between two high-performance video codings. Background technique [0002] The current mainstream video coding standard is H.264 / AVC. With the development of technologies such as networks and transmission channels, high-definition video has gradually become the main business of network storage and transmission. The block mechanism in the H.264 / AVC standard cannot To obtain very good coding performance, for this reason, the two major international standardization organizations ITU-T and ISO / IEC set up a video coding joint collaboration group JCT-VC to jointly develop a new generation of international video coding standards: high performance video coding ( HEVC). The standard was developed in October 2010 and has been completed so far. Compared with the H.264 / AVC standard, the...

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Problems solved by technology

Therefore, the transcoding method from the MPEG-2 standard to the H.264 / AVC standard does not apply to the transcoding from the H.264 / AVC standard to the HEVC standard

However, if the decoder of the H.264 / AVC standard is directly cascaded with the encoder of the HEVC standard, since full coding of the HEVC standard is required, including inter-frame and intra-frame predictive coding, transformation, quantization, entropy coding, etc., the calculation is complicated must be high

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