Concise Radiometric Calibration Using The Power of Ranking

Gong, Han, Finlayson, Graham and Mohammadzadeh Darrodi, Maryam (2017) Concise Radiometric Calibration Using The Power of Ranking. In: British Machine Vision Conference (BMVC). BMVA Press.

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Compared with raw images, the more common JPEG images are less useful for machine vision algorithms and professional photographers because JPEG-sRGB does not preserve a linear relation between pixel values and the light measured from the scene. A camera is said to be radiometrically calibrated if there is a computational model which can predict how the raw linear sensor image is mapped to the corresponding rendered image (e.g. JPEGs) and vice versa. This paper begins with the observation that the rank order of pixel values are mostly preserved post colour correction. We show that this observation is the key to solving for the whole camera pipeline (colour correction, tone and gamut mapping). Our rank-based calibration method is simpler than the prior art and so is parametrised by fewer variables which, concomitantly, can be solved for using less calibration data. Another advantage is that we can derive the camera pipeline from a single pair of raw-JPEG images. Experiments demonstrate that our method delivers state-of-the-art results (especially for the most interesting case of JPEG to raw).

Item Type: Book Section
Uncontrolled Keywords: radiometric calibration,rank-based
Faculty \ School: Faculty of Science > School of Computing Sciences
UEA Research Groups: Faculty of Science > Research Groups > Interactive Graphics and Audio
Faculty of Science > Research Groups > Colour and Imaging Lab
Depositing User: Pure Connector
Date Deposited: 25 Jul 2017 05:12
Last Modified: 20 Apr 2023 01:12
DOI: 10.5244/c.31.27


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