Title | Bridging the Gap Between Imaging Performance and Image Quality Measures |
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Authors | Fry, E., Triantaphillidou, S., Jacobson, R., Jarvis, J. and Fagard-Jenkin, R. |
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Type | Conference paper |
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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 (CPIQM), 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, modular approach enables system components to be optimised 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 hypothesise 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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Keywords | Image quality, Imaging system performance, image quality metrics, MTF, NPS |
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Year | 2018 |
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Conference | IS&T Electronic Imaging Symposium 2018 - Image Quality System Performance XV |
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Publisher | The Society of Imaging Science and Technology |
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Publisher's version | |
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Publication dates |
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Published | 13 Jan 2018 |
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Journal | Electronic Imaging |
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ISSN | 2470-1173 |
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Digital Object Identifier (DOI) | https://doi.org/10.2352/ISSN.2470-1173.2018.12.IQSP-231 |
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Web address (URL) of conference proceedings | http://ist.publisher.ingentaconnect.com/content/ist/ei |
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Web address (URL) | http://www.ingentaconnect.com/content/ist/ei/pre-prints/content-ei2018-iqsp-231 |
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