IRCCyN/IVC Selective Encryption database

Author: IRCCyN/IVC

Partner: Yes

Contact: Florent Autrusseau (




Subjective scores: true

Total: 200

SRC: 8

HRC: 25

Ratings: 21

Method: Custom


8 original color images were used, 200 distorted images were generated from 5 different encryption techniques with 5 parameters. Subjective evaluations were made at viewing distance of 6 times the screen height using a “Pair Comparison” protocol method with 5 categories and 21 observers. Distortions for each processing and each image have been optimised in order to uniformly cover the subjective scale. The source code for running the subjective experiment can be found here:


Still images and a Microsoft Excel spreadsheet, giving all subjective quality scores is included in one archive at HTTP (47MB): Link: Qualinet Databases Mirror: Link: ftpes:// Username: dbq-mirrors Password: kucykepe

References and Citation

Please, cite the following in your reference if you use this database for your work [ASP10].


  • ASP10: Florent Autrusseau, Thomas Stuetz and Vinod Pankajakshan, Subjective quality assessment of selective encryption techniques,