The purpose of this page is to make available one subjective quality assessment from IRCCyN/IVC. The experiments were conducted in our lab in normalized conditions.


5 original grayscale images were used, 100 distorted images were generated from 10 watermarking algorithms with 2 embedding strengths.

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 16 observers. Distortions for each processing and each image have been optimised in order to uniformly cover the subjective scale.


Download the IVC-Enrico database (20 MB zip file)
A Microsoft Excel spreadsheet, giving all subjective quality scores is included in the above archive.

How to cite the IVC-Enrico database

If you use BibTeX, here's the citation:

title = {Evaluation of standard watermarking techniques},
author = {Marini, Enrico, and Autrusseau, Florent, and Le Callet Patrick},
year = {2007},
note = {}

If you don't use BibTeX, use simply:

Marini, Enrico, and Autrusseau, Florent, and Le Callet Patrick
Evaluation of standard watermarking techniques


This database was used in


Many thanks to Arnaud Tirel  for his valuable help in setting up the experiment.


Here is the labeling of the 10 watermarking algorithms:

The source code for algorithms A1 to A9 is from Peter Meerwald.