Conventional methods for obtaining HDR images are based on two erroneous assumptions

An article published in October in the advanced online edition of Journal on Imaging Sciences of the SIAM (Society for Industrial and Applied Mathematics), shows that conventional methods for obtaining HDR images are based on wrong assumptions, and proposes a method that, based on correct assumptions, boosts the knowledge of this technology. It is described in a study by Raquel Gil Rodríguez, Javier Vázquez-Corral and Marcelo Bertalmío, members of the Image Processing for Enhanced Cinematography (IP4EC) research group at the Department of Information and Communication Technologies (DTIC) at UPF.

As the authors say, “HDR image generation is based on a couple of wrong assumptions. First, that color channels are independent and, secondly, that camera response function (CRF) remains constant while changing the exposure.” One of the main contributions of this paper is to show that these assumptions, which are correct for film photography, in general, do not hold for digital cameras.

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