Digital image quality measurements by objective and subjective methods from series of parametrically degraded images

Aura Tachó; Carles Mitjà; Bea Martínez; Jaume Escofet; Miquel Ralló

doi:10.1117/12.2027001

18 November 2013 Digital image quality measurements by objective and subjective methods from series of parametrically degraded images

Aura Tachó, Carles Mitjà, Bea Martínez, Jaume Escofet, Miquel Ralló

Author Affiliations +

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87858V (2013) https://doi.org/10.1117/12.2027001
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

Many digital image applications like digitization of cultural heritage for preservation purposes operate with compressed files in one or more image observing steps. For this kind of applications JPEG compression is one of the most widely used. Compression level, final file size and quality loss are parameters that must be managed optimally. Although this loss can be monitored by means of objective image quality measurements, the real challenge is to know how it can be related with the perceived image quality by observers. A pictorial image has been degraded by two different procedures. The first, applying different levels of low pass filtering by convolving the image with progressively broad Gauss kernels. The second, saving the original file to a series of JPEG compression levels. In both cases, the objective image quality measurement is done by analysis of the image power spectrum. In order to obtain a measure of the perceived image quality, both series of degraded images are displayed on a computer screen organized in random pairs. The observers are compelled to choose the best image of each pair. Finally, a ranking is established applying Thurstone scaling method. Results obtained by both measurements are compared between them and with other objective measurement method as the Slanted Edge Test.

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Aura Tachó, Carles Mitjà, Bea Martínez, Jaume Escofet, and Miquel Ralló "Digital image quality measurements by objective and subjective methods from series of parametrically degraded images", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87858V (18 November 2013); https://doi.org/10.1117/12.2027001

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KEYWORDS

Image quality

Modulation transfer functions

Image compression

Quality measurement

Image analysis

Surface plasmons

Digital imaging

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