Decoding method for video frequency data destroyed by path noise

Abstract

In a video decoding method, the video data to be decoded is arranged in a first unit, which first unit includes a plurality of second data units, and each of which second data unit includes an information on a status of the second data unit. First, it is determined whether the status information in a current second unit is invalid or not. If it is determined that the status information in the second unit is invalid, the status information is changed into another one among a set of possible status information to decode the video data from the current second unit to a last second unit in a current first unit on the basis of the changed status information. Afterwards, if the decoding of video data from the current second unit to the last second unit in the current first unit was successful for none of the possible status information, a flag representing an encoding scheme of the video data is changed such that the flag indicates that the second unit is encoded in an inter-frame mode. Then, the video data from the current second unit to the last second unit in the current first unit is decoded according to the changed flag. Finally, the video data from the current second unit to the last second unit in the current first unit is replaced with those in a previous frame if the decoding of the video data in the step (d) was unsuccessful.

Description

technical field [0001] The present invention relates to a video data decoding method, more specifically, to a method for error detection and error correction of video data received by a decoder. Background technique [0002] Error-robustness has always been one of the main concerns in video communication, especially in systems with many errors such as wireless communication systems. Therefore, many efforts have been made to improve the error resistance of transmitted data in video communication systems. [0003] From the point of view of the feedback channel concept, the methods for improving the error resistance of video communication systems can be roughly divided into two categories: one is the feedback method, and the other is the feedforward method. [0004] In a typical feedback approach, data is retransmitted in accordance with the interaction between the decoder and encoder. [0005] FIG. 1 is a conceptual block diagram of a wireless communication system applying a...

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Problems solved by technology

[0015] However, this method usually adds additional information for error resistance, which may increase the new bit budget

Two other disadvantages are: additional information in transit is susceptible to channel errors and errors may occur in unprotected areas

However, the advantages of H.263 over error-prone channels cannot be guaranteed for the following reasons: (1) information is corrupted in variable-length coding (VLC) mode on wireless channels with both random and burst errors; (2) Passable options enable management information, e.g., chroma macroblock type and coded block type (MCBPC), to have a whole set of possible syntax elements, while making it difficult to detect errors on the decoder side

In other words, the added information also makes the H.263 bit stream prone to channel errors in the wireless link due to the four passable options; (3) due to the lack of macro module limiters, the number of lost modules is increased

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