Jump to content United States-English
HP.com Home Products and Services Support and Drivers Solutions How to Buy
» Contact HP

HP Labs home

Technical reports


HP Labs

» Research
» News and events
» Technical reports
» About HP Labs
» Careers @ HP Labs
» Worldwide sites
» Downloads
Content starts here

Click here for full text: PDF

Representative Image Thumbnails: Automatic and Manual

Samadani, Ramin; Mauer, Tim; Berfanger, David; Clark, Jim; Bausk, Brett


Keyword(s): image resizing, image browsing, thumbnails, blur, noise, subjective studies

Abstract: Image thumbnails are used in most imaging products and applications, where they allow quick preview of the content of the underlying high resolution images. The question: "How would you best represent a high resolution original image given a fixed number of thumbnail pixels?" is addressed using both automatically and manually generated thumbnails. Automatically generated thumbnails that preserve the image quality of the high resolution originals are first reviewed and subjectively evaluated. These thumbnails allow interactive identification of image quality, while simultaneously allowing the viewer's knowledge to select desired subject matter. Images containing textures are, however, difficult for the automatic algorithm. Textured images are further studied by using photo editing to manually generate representative thumbnails. The automatic thumbnails are subjectively compared to standard (filter and subsample) thumbnails using clean, blurry, noisy, and textured images. Results using twenty subjects find the automatic thumbnails more representative of their originals for blurry images. In addition, as desired, there is little difference between the automatic and standard thumbnails for clean images. The noise component improves the results for noisy images, but degrades the results for textured images. Further studying textured images, the manual thumbnails were subjectively compared to standard thumbnails for four images. Evaluation using forty judgments found a bimodal distribution for preference between the standard and the manual thumbnails, with some observers preferring manual thumbnails and others preferring standard thumbnails. Publication Info: To be published at Human Vision & Electronic Imaging, Jan 2008, San Jose, CA

12 Pages

Back to Index

»Technical Reports

» 2009
» 2008
» 2007
» 2006
» 2005
» 2004
» 2003
» 2002
» 2001
» 2000
» 1990 - 1999

Heritage Technical Reports

» Compaq & DEC Technical Reports
» Tandem Technical Reports
Printable version
Privacy statement Using this site means you accept its terms Feedback to HP Labs
© 2009 Hewlett-Packard Development Company, L.P.