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Screen coding method under low code rate

A coding method and low-bit-rate technology, applied in digital video signal modification, electrical components, image communication, etc., can solve problems such as high bandwidth occupation, no consideration of screen content complexity, and large data volume

Inactive Publication Date: 2006-11-08
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, this patent does not consider factors such as the complexity of the screen content, the intensity of changes in adjacent screens, and the intensity of changes in adjacent screens. The amount of encoded data is relatively large, and the occupied bandwidth is relatively high.

Method used

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  • Screen coding method under low code rate
  • Screen coding method under low code rate

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[0027] Such as figure 1 As shown, the specific implementation steps are as follows:

[0028] Firstly, the computer screen image data is collected, and the color bit of the collected image data is converted from high-order color to low-order color and saved.

[0029] Secondly, the screen image is evenly divided into multiple blocks, and the block is compared with the corresponding block of the previous frame image to record how many blocks have changed in total. According to the severity of the change, different methods are used , using the method of image resolution reduction in the spatial domain and adaptive key frame interval in the temporal domain for encoding processing:

[0030] (1) If there is no change, then no coding, but if the non-coding time exceeds 1 minute, a key frame is forced to be coded.

[0031] (2) If there is only one or two image blocks in the changed block, the current frame is encoded as a non-key frame after the spatial domain image resolution is red...

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Abstract

The present invention refers to low code rate screen encoding method, belonging to video coding decoding technology field. It contains collecting computer screen picture; uniformly dividing screen picture into plurality of image pieces; comparing with previous frame screen picture corresponded piece; according to comparative result determining whether to make space domain resolution ratio reducing and encoding to current frame, if encoding then adopting time domain self adaptation key frame interval method to determine encoding as key frame or non-key frame; respectively processing mouse messages and image data, adopting destructive and non destructive encoding adjoined encoding method to image data. The present invention is suitable for low code rate videoconference, tele education, and long-range control etc.

Description

technical field [0001] The invention relates to a method in the technical field of video encoding and decoding, in particular to a screen encoding method at a low bit rate. Background technique [0002] In video conferencing, remote network teaching, computer remote monitoring and many other aspects, the image transmission of computer screen is an indispensable link. One of the most important factors affecting the quality of screen transmission is the method of screen encoding, especially at low bit rates, which puts forward higher requirements for screen encoding. Currently, there are several methods for screen encoding: [0003] Method 1: Collect screen data as video data, and use a traditional video encoder to encode. Traditional video encoders, including MPEG4 (an ISO / IEC video codec standard developed by the Motion Picture Experts Group) and H.264 (a video codec standard developed by the Video Joint Working Group) and WME (a video codec standard developed by Microsoft...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/146H04N19/156H04N19/172H04N19/176H04N19/33
Inventor 张智强申瑞民王加俊童任沈家明
Owner SHANGHAI JIAO TONG UNIV
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