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Multi-path picture mixing method based on DTC space

A picture and space technology, applied in the field of image communication, can solve the problems of secondary coding distortion, difficult to achieve interconnection, heavy calculation, etc., to avoid distortion, enhance flexibility, and break through the bottleneck of calculation.

Inactive Publication Date: 2004-11-03
WUHAN UNIV
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Problems solved by technology

The disadvantage is the distortion and heavy calculation caused by the secondary encoding
The third is to use the H263 CPM syntax. The H263 standard has considered the multi-channel video transmission problem. It divides multiple video streams into sub-video streams and multiplexes them in the H263 syntax stream. However, the current conference terminals do not follow this standards, it is still difficult to achieve interoperability between different products

Method used

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  • Multi-path picture mixing method based on DTC space
  • Multi-path picture mixing method based on DTC space
  • Multi-path picture mixing method based on DTC space

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Embodiment Construction

[0029] see figure 1 , at the syntax level of the video stream, multiple video streams are combined according to the mixed spatial position, for example, four QCIF code streams are combined into one CIF code stream, or four CIF code streams are combined into one 4CIF code stream , the video stream is mapped to the syntactic stream of the corresponding macroblock of the mixed large picture, and the image header information, block group header information and macroblock header information of the mixed large picture are generated by the sub-channels participating in the mixing. figure 1 That is, it illustrates that the four code streams Pic1-4 and the corresponding macroblock layers MB1-4 and group-of-block layers GOB1-4 are mapped into the code stream Pic and the corresponding macroblock layer and group-of-block layer processes. The mixing of this method is completely carried out at the code stream level, only the calculation of demultiplexing and multiplexing of video streams, a...

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Abstract

This invention relates to a method for mixing multichannel pictures based on DCT space which merges the multichannel video streams together in terms of mixed space positions at the video stream grammar first level, each video stream is imaged to a grammar stream of a mixed large picture related positioned macro-block and information of the mixed large picture head, block set head and the macro-block head is generated by the sub-channels joining in the mixing. The method can increase the efficiency of video servers and reduce distortion.

Description

technical field [0001] The invention belongs to the field of image communication, in particular to a method for mixing multiple images on a video server. Background technique [0002] The video broadcast center server needs to have the function of mixing the images of multiple sub-venues and then forwarding them to each receiving terminal, so that each receiving terminal can see multiple images at the same time. There are three conventional methods to realize this process at this stage. One is to open multiple logical channels, and the central server will still use multiple logical channels to send the received multi-channel videos of the branch venues to each terminal. Each terminal is required to have multiple video decoders, and the picture mixing of the terminal is completed when it is decoded and displayed. Ordinary terminals need to be modified to have this capability, otherwise they can still only see one video. The advantage of this method is that the central serve...

Claims

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Application Information

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IPC IPC(8): H04N1/41H04N5/14H04N19/625
Inventor 胡瑞敏王中元韩镇艾浩军
Owner WUHAN UNIV
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