28 January 2008 Process perspective on image quality evaluation
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The psychological complexity of multivariate image quality evaluation makes it difficult to develop general image quality metrics. Quality evaluation includes several mental processes and ignoring these processes and the use of a few test images can lead to biased results. By using a qualitative/quantitative (Interpretation Based Quality, IBQ) methodology, we examined the process of pair-wise comparison in a setting, where the quality of the images printed by laser printer on different paper grades was evaluated. Test image consisted of a picture of a table covered with several objects. Three other images were also used, photographs of a woman, cityscape and countryside. In addition to the pair-wise comparisons, observers (N=10) were interviewed about the subjective quality attributes they used in making their quality decisions. An examination of the individual pair-wise comparisons revealed serious inconsistencies in observers' evaluations on the test image content, but not on other contexts. The qualitative analysis showed that this inconsistency was due to the observers' focus of attention. The lack of easily recognizable context in the test image may have contributed to this inconsistency. To obtain reliable knowledge of the effect of image context or attention on subjective image quality, a qualitative methodology is needed.
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Tuomas Leisti, Raisa Halonen, Anna Kokkonen, Hanna Weckman, Marja Mettänen, Lasse Lensu, Risto Ritala, Pirkko Oittinen, and Göte Nyman "Process perspective on image quality evaluation", Proc. SPIE 6808, Image Quality and System Performance V, 68080P (28 January 2008); doi: 10.1117/12.765438; https://doi.org/10.1117/12.765438


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