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Proceedings Paper

Blockiness in JPEG-coded images
Author(s): Lydia Meesters; Jean-Bernard Martens
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Paper Abstract

In two experiments, dissimilarity data and numerical scaling data were obtained to determine the underlying attributes of image quality in baseline sequential JPEG coded imags. Although several distortions were perceived, i.e., blockiness, ringing and blur, the subjective data for all attributes where highly correlated, so that image quality could approximately be described by one independent attribute. We therefore proceeded by developing an instrumental measure for one of these distortions, i.e., blockiness. In this paper a single-ended blockiness measure is proposed, i.e., one that uses only the coded image. Our approach is therefore fundamentally different from most image quality models that use both the original and the degraded image. The measure is based on detecting the low- amplitude edges that result from blocking and estimating the amplitudes. Because of the approximate 1D of the underlying psychological space, the proposed blockiness measure also predicts the image quality of sequential baseline coded JPEG images.

Paper Details

Date Published: 19 May 1999
PDF: 13 pages
Proc. SPIE 3644, Human Vision and Electronic Imaging IV, (19 May 1999); doi: 10.1117/12.348446
Show Author Affiliations
Lydia Meesters, IPO Ctr. for Research on User-System Interaction (Netherlands)
Jean-Bernard Martens, IPO Ctr. for Research on User-System Interaction (Netherlands)


Published in SPIE Proceedings Vol. 3644:
Human Vision and Electronic Imaging IV
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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