Transmission protection method of multi-media communication

Abstract

The invention discloses method for protecting comm. transmission for multimedia video or still image. The method raises comm. service quality in multimedia without increasing burden. The method includes steps: digital watermark technique is adopted to hide information of key data in not key data codes of compressed image; under protection of digital watermark, using protective backup for key data detects whether normal transmitted key data is correct or not so as to detect error code; carrying out cyclic mutual backup by using macro blocks in same positions in front and back macro block set; embedding coded motion vector in form of digital watermark to DCT transformation coefficient, and ensuring that video data are not influenced as best as one can; when error code occurs, if key data backup is correct, then the backup replaces former key data; otherwise, using mean value of key data in adjacent macro blocks within same frame to replace former key data approximately.

Description

technical field [0001] The invention relates to a multimedia communication method, in particular to a transmission protection method for multimedia communication. Background technique [0002] Multimedia communication, especially digital video technology, is widely used in communication, computer, radio and television, etc., bringing a series of applications such as conference TV, videophone, digital TV, and media storage, and prompting the emergence of many video coding standards. International Telecommunication Union Telecommunication Standardization Sector (International Telecommunication Union Telecommunication Standardization Sector, referred to as "ITU-T") and the International Standardization Organization (International Standardization Organization, referred to as "ISO"), the International Electrotechnical Commission (International Electrotechnical Commission, referred to as "IEC") movement The Moving Picture Expert Group (MPEG for short) is two major organizations th...

AI Technical Summary

Problems solved by technology

[0021] In addition, there is no effective combination of critical data protection and error concealment at the same time

[0022] In practical applications, the above scheme has the following problems: In terms of key data protection, using UEP to protect key data requires additional overhead and increased code traffic

Generally speaking, packet loss is often caused by network congestion and bandwidth narrowing. If in order to protect key data, instead of increasing traffic, this is a logical contradiction of this method, which also makes the use effect not good.

In addition, although the self-defined section method in the communication protocol has its ingenuity, it depends on the specific protocol and lacks generality

However, the data segmentation method is too complicated to be practical.

Directly replace or extrapolate the current frame data from the key data of the previous frame, which is only suitable for some key data and lacks versatility

[0023] However, other error concealment methods can only temporarily conceal the distortion caused by bit errors, and the effect of the simple method is not good, while the complex method requires a large amount of calculation and requires high processing capacity of the terminal. In addition, the more serious problem is the existing The accuracy of the error detection method is too low, which directly limits the effect of error concealment

[0024] The main reason for this situation is that a separate key data protection method either needs additional overhead and cannot solve the fundamental network congestion problem, or is too complicated to implement or has no versatility; Not good enough, consumes processing resources, and does not have a high-accuracy error detection mechanism as a prerequisite

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