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Wikipedia definition
1. Compression artifactA compression artifact (or artefact) is a noticeable distortion of media caused by the application of lossy data compression. Lossy data compression involves discarding some of the media's data so that it becomes simplified enough to be stored within the desired disk space (known as a data rate or bit rate for media that is streamed).
Read “Compression artifact” on English Wikipedia
Read “ブロックノイズ” on Japanese Wikipedia
Read “Compression artifact” on DBpedia

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