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Identification of image attributes that are most affected with changes in displayed image size

Park, Jae Y. and Triantaphillidou, Sophie and Jacobson, Ralph E. (2009) Identification of image attributes that are most affected with changes in displayed image size. In: Farnand, Susan P. and Gaykema, Frans, (eds.) Image quality and system performance VI : 19-21 January 2009, San Jose, California, USA. Proceedings of SPIE (7242). IS&T - the Society for Imaging and Science and Technology and SPIE, pp. 10-1. ISBN 9780819474926

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Official URL: http://dx.doi.org/10.1117/12.805844

Abstract

This paper describes an investigation of changes in image appearance when images are viewed at different image sizes on a high-end LCD device. Two digital image capturing devices of different overall image quality were used for recording identical natural scenes with a variety of pictorial contents. From each capturing device, a total of sixty four captured scenes, including architecture, nature, portraits, still and moving objects and artworks under various illumination conditions and recorded noise level were selected. The test set included some images where camera shake was purposefully introduced. An achromatic version of the image set that contained only lightness information was obtained by processing the captured images in CIELAB space. Rank order experiments were carried out to determine which image attribute(s) were most affected when the displayed image size was altered. These evaluations were carried out for both chromatic and achromatic versions of the stimuli. For the achromatic stimuli, attributes such as contrast, brightness, sharpness and noisiness were rank-ordered by the observers in terms of the degree of change. The same attributes, as well as hue and colourfulness, were investigated for the chromatic versions of the stimuli. Results showed that sharpness and contrast were the two most affected attributes with changes in displayed image size. The ranking of the remaining attributes varied with image content and illumination conditions. Further, experiments were carried out to link original scene content to the attributes that changed mostly with changes in image size.

Item Type:Book Section
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:8955
Deposited On:16 Dec 2010 12:53
Last Modified:16 Dec 2010 12:53

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