ATIS Telecom Glossary
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error concealment
In the receipt and processing of digitized television transmissions, a method of covering up errors from dropouts by using the redundancy in most adjacent-frame image information. Note: Video images are frequently nearly identical from frame to frame. Adjacent video lines frequently have almost the same detail. It becomes possible, therefore, when a "burst error" involving the modification or loss of many recorded bits occurs, to determine (from adjacent image segments) a most probable substitution. Such substitutions, when infrequent and supported by the image redundancy, are often accepted by the viewers as "correct." (This is a degree of freedom in image data recovery that is obviously not utilized when recording scientific and financial data.) [After SMPTE] The additional information needed by the algorithm for decision and substitution is usually provided by a data-storage cache established during reproduction.

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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