Aspect of image quality and the Internet

Bilissi, E. 2004. Aspect of image quality and the Internet. PhD thesis University of Westminster School of Media, Arts and Design

TitleAspect of image quality and the Internet
TypePhD thesis
AuthorsBilissi, E.
Abstract

The colour reproduction of images viewed across the Internet is an area of significant importance due to the recent increase in the levels of on-line shopping and the number of digital imaging libraries accessible over the Internet. The quality of images viewed on-line can be affected by variables such as the display and viewing conditions. This thesis describes a programme of work that investigates existing methods for controlling the colour and tone reproduction of images accessed over the Internet.

The reproduced colour of images viewed across the Internet may be affected by transformations applied to provide consistent colour reproduction among different web browsers and operating systems for 8-bit depth graphics card adapter display systems. In this work objective measures (ΔE*ab) are used to determine the range of colours that can be reproduced with perceptible colour differences. It is shown that a 24-bit depth image displayed under the 8-bit depth setting of a graphics card adapter results in lower colour differences than the 216 colour image displayed under the same bit depth setting.

The standard RGB colour space (sRGB) has been proposed as a means for obtaining accurate reproduction of colour and tone for images displayed across the Internet provided that they are viewed under the reference display and viewing conditions defined in the standard. A survey has indicated that the typical display and viewing conditions of a sample of Internet users frequently deviate from the reference sRGB standard. Psychophysical experiments to determine the perceptibility and acceptability of differences in CRT monitor gamma under controlled and uncontrolled display and viewing conditions are reported. The point of subjective equality (PSE) and the just noticeable difference values of gamma for the imperceptibility and acceptability of gamma differences in images are estimated. A survey of the gamma settings of a sample of computer monitors is reported. It is shown that, due to deviations in the gamma settings, an sRGB image displayed on 50% of the monitors surveyed will be judged as perceptibly different from a monitor complying with the sRGB standard, while 40% of monitors will be judged as acceptably similar, although observers may detect a difference.

Year2004
Publication dates
Completed2004

Related outputs

Comparative performance between human and automated face recognition systems, using CCTV imagery, different compression levels and scene parameters
Tsifouti, A., Triantaphillidou, S., Larabi M-C, Bilissi, E. and Psarrou, A. 2015. Comparative performance between human and automated face recognition systems, using CCTV imagery, different compression levels and scene parameters . SPIE Electronic Imaging: Image Quality and System Performance XII. San Fransisco, USA Jan 2015 SPIE.

The effects of scene content parameters, compression, and frame rate on the performance of analytics systems
Tsifouti, A., Triantaphillidou, S., Larabi, M.C., Doré, G, Bilissi, E. and Psarrou, A. 2015. The effects of scene content parameters, compression, and frame rate on the performance of analytics systems. SPIE Elecgtronic Imaging: Image Quality and System Performance XII. San Fransisco, USA Jan 2015 SPIE.

A case study in identifying acceptable bitrates for human face recognition tasks
Tsifouti, A., Triantaphillidou, S., Larabi, M.C., Bilissi, E. and Psarrou, A. 2015. A case study in identifying acceptable bitrates for human face recognition tasks. Signal Processing: Image Communication . 36, p. 14–28.

Acceptable bit-rates for human face identification from CCTV imagery
Tsifouti, A., Triantaphillidou, S., Bilissi, E. and Larabi, M.C. 2013. Acceptable bit-rates for human face identification from CCTV imagery. in: Burns, P.D. and Triantaphillidou, S. (ed.) Image Quality and System Performance X SPIE.

Langford's advanced photography
Bilissi, E. and Langford, M. 2011. Langford's advanced photography. Oxford Focal Press.

Just noticeable gamma differences and acceptability of sRGB images displayed on a CRT monitor
Bilissi, E., Jacobson, R.E. and Attridge, G.G. 2008. Just noticeable gamma differences and acceptability of sRGB images displayed on a CRT monitor. Imaging Science Journal. 56 (4), pp. 189-200.

Langford’s advanced photography. 7th edition
Langford, M. and Bilissi, E. 2007. Langford’s advanced photography. 7th edition. Elsevier.

Perceptibility and acceptability of gamma differences of displayed sRGB images
Bilissi, E., Jacobson, R.E. and Attridge, G.G. 2003. Perceptibility and acceptability of gamma differences of displayed sRGB images. in: PICS 2003: the PICS Conference, an International Technical Conference on the Science and Systems of Digital Photography, including the Fifth International Symposium on Multispectral Color Science Rochester, USA Society for Imaging Science and Technology.

Influence of luminance and resolution on the perceived quality of black-and-white images on soft displays
Bilissi, E., Jacobson, R.E. and Attridge, G.G. 2002. Influence of luminance and resolution on the perceived quality of black-and-white images on soft displays. Imaging Science Journal. 50 (4), pp. 277-289.

The effect of reduced color depth on the color reproduction of web images
Bilissi, E., Jacobson, R.E. and Attridge, G.G. 2002. The effect of reduced color depth on the color reproduction of web images. in: PICS 2002: IS&T's PICS Conference, an International Technical Conference on Digital Image Capture and Associated System, Reproduction and Image Quality Technologies Portland, USA Society for Imaging Science and Technology.

Permalink - https://westminsterresearch.westminster.ac.uk/item/93119/aspect-of-image-quality-and-the-internet


Share this
Tweet
Email