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JPEG ghost analysis

A technique (Farid and Bravo, 2012) that identifies double-compressed patches by resaving a composite JPEG at multiple quality levels and identifying the quality at which the difference between the composite and the resaved version is minimised for a localised region.

Explained in

PDF Metadata Forensics and Document Image Authentication

Related terms

ByteRange Content-aware fill Copy-move detection Cross-reference table (xref)Error Level Analysis (ELA)EXIF (Exchangeable Image File Format)Incremental update PRNU fingerprint XMP metadata

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