Resolution-variable coding mode prediction method and device

A coding mode and resolution technology, applied in the video field, can solve problems such as large resource consumption, and achieve the effect of saving coding time and simple re-optimization

Inactive Publication Date: 2016-08-24
LETV CLOUD COMPUTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a coding mode prediction method and device with variable resolution, which are used to solve the defect that real-time transcoding consumes huge resources of the transcoder in the prior art. In the case of effectively reducing the coding complexity, Enables high-quality variable-resolution real-time transcoding

Method used

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  • Resolution-variable coding mode prediction method and device

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Embodiment 1

[0023] figure 1 It is a technical flow chart of Embodiment 1 of the present invention, combined with figure 1 , a coding mode prediction method with variable resolution in an embodiment of the present invention mainly includes two major steps:

[0024] Step 110: Decode the current input code stream, and obtain code stream information during the decoding process, wherein the code stream information includes the frame type of the currently decoded frame and macroblock coding information;

[0025] When the transcoding system is working, it first decodes the input 4K stream, and then encodes the decoded video frames. The core of the embodiment of the present invention is that before encoding the decoded frame, the original encoding information of the input code stream is acquired, and the encoding information is inherited according to the original encoding information, so as to realize encoding information prediction for subsequent high-quality coding.

[0026] In the embodimen...

Embodiment approach

[0039] figure 2 It is a technical flow chart of Embodiment 2 of the present invention. Embodiment 2 is an implementation manner of intra-frame coding information prediction in the embodiment of the present invention, which mainly includes the following steps:

[0040] Step 210: Select a candidate reference block corresponding to the current coded macroblock in the input code stream according to the mapping relationship between the resolution of the input code stream and the resolution of the transcoding target;

[0041] The physical resolution of 4K TV reaches 3840*2160, which is 4 times that of full high definition (FHD.1920*1080) and 9 times that of high definition (HD.1280*720). For real-time transcoding, the same content has many similarities when encoded at different bit rates or resolutions, so the encoding information of the source stream can be reused. Therefore, the 4K bit stream from 2160P to When the codes are 1080P and 720P, the reference block corresponding to t...

Embodiment 3

[0050] image 3 It is a technical flowchart of Embodiment 3 of the present invention, and Embodiment 3 exemplifies an implementation manner of predicting coding information of a bidirectional predictive coding frame in the embodiment of the present invention. Figure 4 yes image 3 A further refinement of the illustration, combined with image 3 and Figure 4 , the third embodiment of the present invention mainly includes the following steps:

[0051] Step 310: Select a candidate reference block corresponding to the currently coded macroblock in the input code stream according to the mapping relationship between the resolution of the input code stream and the resolution of the transcoding target;

[0052] This step is the same as the execution process of step 210. When transcoding from the input code stream of 2160P resolution to the output code stream of 1080P, four candidate reference blocks are selected for the current coded macroblock. Similarly, the input code stream o...

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Abstract

The invention relates to a resolution-variable coding mode prediction method and device. A present input code stream is decoded, and code stream information, which comprises the type of a present decoded frame and macro block coding information, is obtained in the decoding process; and the type of a transcoding frame corresponding to the input code stream is predicted according to the code stream information, and coding information of the transcoding frame is predicted according to the mapping relation between the resolution of the input stream and the target resolution of transcoding. Transcoding time is reduced, and the transcoding quality is ensured.

Description

technical field [0001] Embodiments of the present invention relate to the field of video technology, and in particular, to a variable resolution coding mode prediction method and device. Background technique [0002] With the popularization of 4K TV and the increase of home bandwidth, people's demand for high-quality live video is also increasing. 4K TV refers to a TV with a screen display of 4K resolution. 4K resolution is an emerging resolution standard for digital movies and digital content. It gets its name from its horizontal resolution of about 4000 pixels (pixel), and there are slight differences according to different application fields. The 4K-level resolution can provide more than 8.8 million pixels, at least nearly 10 million pixels of display quality, and achieve movie-level image quality, which is more than four times that of the current top-level 1080p resolution, and the display fineness is 1080p More than 4 times. [0003] Of course, the price of ultra-hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/176H04N19/40H04N19/103H04N19/154H04N19/52H04N19/593
CPCH04N19/103H04N19/154H04N19/176H04N19/40H04N19/52H04N19/593H04N19/107H04N19/132H04N19/157H04N19/172H04N19/105H04N19/159H04N19/184H04N19/59H04N19/70
Inventor 白茂生
Owner LETV CLOUD COMPUTING CO LTD
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