8 original color images were used (4 natural images: Jpeg.org DB and 4 art images: EROS DB), 120 distorted images were generated from 3 different processing, and 5 compression rates. Compressions considered: JPEG, JPEG2000, LAR coding. These algorithms have the advantage to generate very different type of distortions. Subjective evaluations were made at viewing distance of 6 times the screen height using a DSIS (Double Stimulus Impairment Scale) method with 5 categories and 20 observers. Distortions for each processing and each image have been optimized in order to uniformly cover the subjective scale.
Still images and a Microsoft Excel spreadsheet, giving all subjective quality scores is included in one archive at HTTP (54MB): Link: http://www.irccyn.ec-nantes.fr/~autrusse/Databases/LAR/LAR_SubjExp.zip Qualinet Databases Mirror: Link: ftpes://multimediatech.cz/IRCCyN_IVC/IRCCyN_IVC_LAR_SubjExp Username: dbq-mirrors Password: kucykepe
References and Citation
Please, cite the following paper in your reference if you use this database for your work [SPA09].
SPA09: C. Strauss, F. Pasteau, F. Autrusseau, M. Babel, L. Bedat, O. Deforges, "Subjective and Objective Quality Evaluation of LAR coded art images", IEEE Intl. Conf. on Multimedia & Expo, ICME 2009, New York, USA, June 28 - July 3 2009.