Sony ARW2 compression: Artifacts and credible repair

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


Although most cameras produce JPEG-encoded images ready for viewing, many also offer the ability to save the digitized, but otherwise unprocessed, sensor data in a file so that more sophisticated processing can be applied later. For recent Sony cameras, the raw data is encoded in a format known as ARW (Alpha RaW). Controversially, ARW version 2.0 and later employ lossy compression for 32x1-pixel blocks, combining a non-linear reduction of value range and a form of delta encoding. This compression has been associated with occasionally severe visual artifacts. In this paper, the artifacts observed with real cameras using this compression scheme are characterized and several algorithms for credible repair of those artifacts, including computational texture synthesis, are presented and experimentally evaluated.

Original languageEnglish
JournalIS and T International Symposium on Electronic Imaging Science and Technology
StatePublished - 2016
EventVisual Information Processing and Communication VII 2016 - San Francisco, United States
Duration: Feb 14 2016Feb 18 2016

Bibliographical note

Publisher Copyright:
© 2016 Society for Imaging Science and Technology.

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design
  • Computer Science Applications
  • Human-Computer Interaction
  • Software
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics


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