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Volume: 31 | Article ID: art00006
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Credible repair of Sony main-sensor PDAF striping artifacts
  DOI :  10.2352/ISSN.2470-1173.2019.4.PMII-585  Published OnlineJanuary 2019
Abstract

Since the introduction of the Minolta Maxxum 9000 in 1985, PDAF (phase detect automatic focus) has been the standard way to achieve sharply-focused images of fast-moving action, such as professional sports. In a typical SLR (single lens reflex) camera, the image for the optical viewfinder is reflected up by the main mirror, while a secondary mirror and optics copy the image to the PDAF detector. However, such an arrangement is impractical for mirrorless digital cameras. Thus, there have been a variety of methods used to incorporate phase sensing on the main sensor – with various trade-offs. The current work discusses some of these trade-offs and then describes in detail a specific type of striping artifact introduced by the masked pixel structures used in Sony sensors. A computational method for credible repair of this artifact also is presented. The method described is quick and fully automatic; it has been implemented as KARWY-SR, an open source JavaScript version using a drag-and-drop interface to repair the artifact in Sony ARW raw files.

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Henry Gordon Dietz, "Credible repair of Sony main-sensor PDAF striping artifactsin Proc. IS&T Int’l. Symp. on Electronic Imaging: Photography, Mobile, and Immersive Imaging,  2019,  pp 585-1 - 585-7,  https://doi.org/10.2352/ISSN.2470-1173.2019.4.PMII-585

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