Method and system for code error shielding

Abstract

The invention discloses an error code concealment method and comprises the following steps: firstly, a sending end divides the received video compressed data into slice structures, distributes neighboring slice structures to non-neighboring OFDM sub-channels or sub-channel groups and sends each slice structure to a receiving end which carries out error concealment to a slice structure which is detected to have errors according to slice structures which are related to the slice structure in time or in space; at the same time, the invention discloses an error concealment system and comprises a sending end and a receiving end; the invention also discloses a sending end which comprises a slice segment module and a frequency domain interleaving module; furthermore, the invention discloses a receiving end which comprises a frequency domain de interleaving module, a decompression and error detection module and an error concealment module. The invention greatly reduces the probability of simultaneous error of the neighboring slice structures, which greatly improves the efficiency of error concealment; furthermore, the invention greatly reduces the probability of simultaneous error of slice structures at the same position of neighboring slice structures.

Description

technical field [0001] The invention relates to the technical field of video transmission, in particular to a code error concealment method, system, sending end and receiving end. Background technique [0002] With the development of communication technology, the transmission application of video stream on wireless channel has been put on the agenda. As the core technology of future mobile communication, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology will become the main modulation technology for broadband wireless transmission. However, the OFDM channel has the characteristics of time-varying and frequency-selective fading, and it is easy to generate bit errors during transmission. The transmission of video data in the OFDM channel is easily affected by bit errors, especially in the case of sudden bit errors, a large number of packets will be lost in video transmission, resulting in the loss of large video blocks at...

AI Technical Summary

Problems solved by technology

[0013] The disadvantage of the prior art is: when more continuous bit errors occur, it is often the bit errors of several consecutive frames appearing in multiple adjacent OFDM sub-channels at the same time, that is: the adjacent data of the same frame and the data of the same position of the adjacent frame Bit errors occur in the data at the same time. It can be seen that the bit errors all occur in the same area of ​​consecutive frames at this time. Therefore, it is impossible to use spatial correlation or time correlation to effectively cover up the error data, so that the output cannot be correctly restored. Raw video data, resulting in poor video output quality

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