Abstract
An evaluation of a no-reference objective quality metric to accurately measure and compare the increased dynamic range capability of modern image capture systems is presented. The use of commercial off-the-shelf equipment and software allows manufacturers and users to produce results that are both transparent and comparable. The no-reference metric is fundamentally based on the evaluation of noise, using a single frame of a 21 density step high dynamic range (HDR) test chart as an input to determine the ratio of the maximum unclipped input luminance to the minimum acceptable input luminance level meeting specified noise criteria. The minimum acceptable input luminance is calculated for several values of signal-to-noise ratio (SNR), with results presented in terms of the relative luminance units of stops of noise. Corresponding arbitrary quality ratings are discussed as they relate to SNR and perceived quality. Results are presented for several modern imaging systems, with a discussion on specifying an appropriate industry quality level.
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