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Determining JPEG Image Standard Quality Factor from the Quantization Tables

Abstract : Identifying the quality factor of JPEG images is very useful for applications in digital image forensics. Though several command-line tools exist and are used in widely used software such as \emph{GIMP} (GNU Image Manipulation Program), the well-known image editing software, or the \emph{ImageMagick} suite, we have found that those may provide inaccurate or even wrong results. This paper presents a simple method for determining the exact quality factor of a JPEG image from its quantization tables. The method is presented briefly and a sample program, written in Unix/Linux Shell bash language is provided.
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Preprints, Working Papers, ...
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https://hal-utt.archives-ouvertes.fr/hal-03321113
Contributor : Jean-Baptiste Vu Van Connect in order to contact the contributor
Submitted on : Tuesday, August 17, 2021 - 9:58:27 AM
Last modification on : Friday, August 27, 2021 - 3:14:07 PM

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  • HAL Id : hal-03321113, version 1
  • ARXIV : 1802.00992

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UTT | CNRS

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Rémi Cogranne. Determining JPEG Image Standard Quality Factor from the Quantization Tables. 2018. ⟨hal-03321113⟩

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