KR980007730A - An image decoder having an error recovery function for motion vector information - Google Patents

Abstract

The present invention relates to an image decoder having error detection for motion vector information received by an image decoder and error recovery for motion vector information for recovering a detected error as original motion vector information, And outputs a variable-length coded data and motion vector information from data input as a bitstream, and outputs a motion compensated prediction error signal by performing decoding on the received data, A decoding unit for outputting the predicted video frame signal based on the vector information and for reconstructing the original video signal by adding the motion compensated prediction error signal and the predicted video frame signal therefrom, And detects the motion vector information and the error vector An error detector for outputting an incoming call; First and second switches for interrupting an output path of the motion vector information and the motion compensated prediction error signal as the error detection signal, and generating candidate motion vector information with reference to the detected motion vector information, The candidate motion vector information included in the range of the picture block is selected and the selected candidate motion vector information is referred to the previous frame signal to perform motion prediction for each candidate motion vector information, A candidate selector for outputting a video signal for each candidate vector information based on the addition of the candidate vector information based on the addition of the candidate frame and the error signal; And selects the motion vector information for which the error has occurred as the motion vector information for this candidate block The error compensating unit is provided to compensate for the motion vector information, so that even if an error occurs due to a transmission channel environment or the like, the error vector information can be more efficiently restored.

Description

An image decoder having an error recovery function for motion vector information

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FIG. 1 is a block diagram of an image decoder having an error recovery function for motion vector information according to the present invention; FIG.

FIGS. 2 (a) to 2 (b) are diagrams for illustrating an example of checking whether motion vector information is erroneous; FIG.

FIG. 3 shows an example of candidate motion vector information for error-induced motion vector information; FIG.

FIG. 4 is a view for explaining an image enhancer having an error recovery function for motion vector information according to the present invention; FIG.

Claims (2)

The variable-length coded data includes motion vector information to which a parity bit is added for each data of a predetermined block unit implementing a moving picture, and receives variable-length coded data input as a bitstream. A receiving buffer (100) for outputting the received data; And outputs the predicted video frame signal based on the previous frame and the motion vector information from the frame memory storing the previous frame, (2000) for reconstructing an original video signal by adding the motion compensated prediction error signal and the predicted video frame signal from the motion compensated prediction error signal, An error detection unit 300 for detecting whether an error has occurred in the motion vector information and outputting the motion vector information and the error detection signal, First and second switches 420 and 440 for interrupting the output path of the prediction error signal; Generates candidate motion vector information in which the error bit may not be generated by referring to the motion vector information detected by the output unit 300, and only the candidate motion vector information included in the range of the picture block, among the candidate motion vector information, Each selected candidate motion vector information is referred to a previous frame signal to perform motion prediction for each candidate motion vector information, and for each candidate vector information based on addition of the motion compensated prediction error signal, A candidate selector 500 for selecting a candidate block having the highest correlation among the candidate vector information from the candidate selector 500 with reference to the previous frame signal, And an error compensator 600 for replacing the motion vector information with the error as the motion vector information. And an error recovery function for the motion vector information. The apparatus of claim 1, wherein the candidate selector (500) refers to the motion vector information included in the error supplied from the first switch (420) A candidate generator 510 for outputting candidate motion vector information generated by inverting only one bit by one bit; A candidate selector 520 for selecting and outputting only candidate motion vector information included in a range of a picture block among candidate motion vector information provided from the candidate generator 510; Performs motion estimation on candidate blocks corresponding to the candidate motion vector information on the basis of the selected candidate motion vector information and the previous frame signal provided from the candidate selector 520 and outputs the resultant signal A candidate block generating unit 530; Adders 541 to 542n for outputting reconstructed candidate block signals by adding motion compensated prediction error signals inputted through the second switch 440 and candidate blocks whose motion is predicted from the candidate block generator 530, And an error recovery function for motion vector information.