Veiling glare: the dynamic range limit of HDR images

J. J. McCann; A. Rizzi

doi:10.1117/12.703042

12 February 2007 Veiling glare: the dynamic range limit of HDR images

J. J. McCann, A. Rizzi

Proceedings Volume 6492, Human Vision and Electronic Imaging XII; 649213 (2007) https://doi.org/10.1117/12.703042
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

High Dynamic Range (HDR) images are superior to conventional images. However, veiling glare is a physical limit to HDR image acquisition and display. We performed camera calibration experiments using a single test target with 40 luminance patches covering a luminance range of 18,619:1. Veiling glare is a scene-dependent physical limit of the camera and the lens. Multiple exposures cannot accurately reconstruct scene luminances beyond the veiling glare limit. Human observer experiments, using the same targets, showed that image-dependent intraocular scatter changes identical display luminances into different retinal luminances. Vision's contrast mechanism further distorts any correlation of scene luminance and appearance. There must be reasons, other than accurate luminance, that explains the improvement in HDR images. The multiple exposure technique significantly improves digital quantization. The improved quantization allows displays to present better spatial information to humans. When human vision looks at high-dynamic range displays, it processes them using spatial comparisons.

Citation Download Citation

J. J. McCann and A. Rizzi "Veiling glare: the dynamic range limit of HDR images", Proc. SPIE 6492, Human Vision and Electronic Imaging XII, 649213 (12 February 2007); https://doi.org/10.1117/12.703042

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