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Proceedings Paper

A method for the evaluation of wide dynamic range cameras
Author(s): Ping Wah Wong; Yu Hua Lu
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Paper Abstract

We propose a multi-component metric for the evaluation of digital or video cameras under wide dynamic range (WDR) scenes. The method is based on a single image capture using a specifically designed WDR test chart and light box. Test patterns on the WDR test chart include gray ramps, color patches, arrays of gray patches, white bars, and a relatively dark gray background. The WDR test chart is professionally made using 3 layers of transparencies to produce a contrast ratio of approximately 110 dB for WDR testing. A light box is designed to provide a uniform surface with light level at about 80K to 100K lux, which is typical of a sunny outdoor scene. From a captured image, 9 image quality component scores are calculated. The components include number of resolvable gray steps, dynamic range, linearity of tone response, grayness of gray ramp, number of distinguishable color patches, smearing resistance, edge contrast, grid clarity, and weighted signal-to-noise ratio. A composite score is calculated from the 9 component scores to reflect the comprehensive image quality in cameras under WDR scenes. Experimental results have demonstrated that the multi-component metric corresponds very well to subjective evaluation of wide dynamic range behavior of cameras.

Paper Details

Date Published: 24 January 2012
PDF: 12 pages
Proc. SPIE 8299, Digital Photography VIII, 829905 (24 January 2012); doi: 10.1117/12.907078
Show Author Affiliations
Ping Wah Wong, Pixim Inc. (United States)
Yu Hua Lu, Ministry of Public Security (China)

Published in SPIE Proceedings Vol. 8299:
Digital Photography VIII
Sebastiano Battiato; Brian G. Rodricks; Nitin Sampat; Francisco H. Imai; Feng Xiao, Editor(s)

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