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Volume: 30 | Article ID: art00007
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Bridging the Gap Between Imaging Performance and Image Quality Measures
  DOI :  10.2352/ISSN.2470-1173.2018.12.IQSP-231  Published OnlineJanuary 2018
Abstract

Imaging system performance measures and Image Quality Metrics (IQM) are reviewed from a systems engineering perspective, focusing on spatial quality of still image capture systems. We classify IQMs broadly as: Computational IQMs (CP-IQM), Multivariate Formalism IQMs (MF-IQM), Image Fidelity Metrics (IF-IQM), and Signal Transfer Visual IQMs (STV-IQM). Comparison of each genre finds STV-IQMs well suited for capture system quality evaluation: they incorporate performance measures relevant to optical systems design, such as Modulation Transfer Function (MTF) and Noise-Power Spectrum (NPS); their bottom-up, modular approach enables system components to be optimized separately. We suggest that correlation between STV-IQMs and observer quality scores is limited by three factors: current MTF and NPS measures do not characterize scene-dependent performance introduced by imaging system non-linearities; contrast sensitivity models employed do not account for contextual masking effects; cognitive factors are not considered. We hypothesize that implementation of scene and process-dependent MTF (SPD-MTF) and NPS (SPD-NPS) measures should mitigate errors originating from scene dependent system performance. Further, we propose implementation of contextual contrast detection and discrimination models to better represent low-level visual performance in image quality analysis. Finally, we discuss image quality optimization functions that may potentially close the gap between contrast detection/discrimination and quality.

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Edward W.S. Fry, Sophie Triantaphillidou, Ralph E. Jacobson, John R. Jarvis, Robin B. Jenkin, "Bridging the Gap Between Imaging Performance and Image Quality Measuresin Proc. IS&T Int’l. Symp. on Electronic Imaging: Image Quality and System Performance XV,  2018,  pp 231-1 - 231-6,  https://doi.org/10.2352/ISSN.2470-1173.2018.12.IQSP-231

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