Apparatus and method for masking video data errors

Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal

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Details

348405, 348466, 3488451, H04B 166, H04N 700

Patent

active

061283398

ABSTRACT:
An apparatus and method for masking video data errors by detecting direct current errors of a block unit during the decoding of video data. A video frame is composed of a plurality of macro blocks formed of a plurality of blocks, each having a predetermined size and a direct current (DC) value. The apparatus masks errors during the decoding of compressed video data, and includes a first frame storing portion for storing video data of a previous frame, and a second frame storing portion for storing video data of a present frame. An error detector calculates a direct current value difference between the respective blocks in the decoded video data and detects a specific macro block error, when the difference value is greater than a reference threshold. A DC error detector copies the data of the same position stored in the first frame storing portion in the position in which the error of the second frame storing portion is generated, when errors are detected in the error detector. On the other hand, the DC error detector writes the data in the second frame storing portion when no errors are detected. Errors within the video data are masked by determining whether the DC errors are generated. This method is preferred when a channel is passed by performing low rate video coding with respect to a video sequence using the H.263 standard, thus preventing error propagation.

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