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Proceedings Paper

Just noticeable differences in perceived image contrast with changes in displayed image size
Author(s): Jae Young Park; Sophie Triantaphillidou; Ralph E. Jacobson
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Paper Abstract

An evaluation of the change in perceived image contrast with changes in displayed image size was carried out. This was achieved using data from four psychophysical investigations, which employed techniques to match the perceived contrast of displayed images of five different sizes. A total of twenty-four S-shape polynomial functions were created and applied to every original test image to produce images with different contrast levels. The objective contrast related to each function was evaluated from the gradient of the mid-section of the curve (gamma). The manipulation technique took into account published gamma differences that produced a just-noticeable-difference (JND) in perceived contrast. The filters were designed to achieve approximately half a JND, whilst keeping the mean image luminance unaltered. The processed images were then used as test series in a contrast matching experiment. Sixty-four natural scenes, with varying scene content acquired under various illumination conditions, were selected from a larger set captured for the purpose. Results showed that the degree of change in contrast between images of different sizes varied with scene content but was not as important as equivalent perceived changes in sharpness 1.

Paper Details

Date Published: 3 February 2014
PDF: 11 pages
Proc. SPIE 9016, Image Quality and System Performance XI, 901602 (3 February 2014); doi: 10.1117/12.2042534
Show Author Affiliations
Jae Young Park, Univ. of Westminster (United Kingdom)
Sophie Triantaphillidou, Univ. of Westminster (United Kingdom)
Ralph E. Jacobson, Univ. of Westminster (United Kingdom)

Published in SPIE Proceedings Vol. 9016:
Image Quality and System Performance XI
Sophie Triantaphillidou; Mohamed-Chaker Larabi, Editor(s)

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