The database containing subjective data of perceived ringing is publicly available to the research community. Please cite the following references if you use this database in your research.
- H. Liu, N. Klomp and I. Heynderickx, "TUD Image Quality Database: Perceived Ringing", http://mmi.tudelft.nl/iqlab/ringing.html.
- H. Liu, N. Klomp and I. Heynderickx, "A No-Reference Metric for Perceived Ringing Artifacts in Images", IEEE Transactions on Circuits and Systems for Video Technology, vol. 20, pp 529-539, April, 2010.
- H. Liu, N. Klomp and I. Heynderickx, "A Perceptually Relevant Approach to Ringing Region Detection", IEEE Transactions on Image Processing, vol. 19, pp. 1414-1426, June, 2010.
Database: Ringing Region Experiment
Database: Ringing Annoyance Experiment
The files are password protected. To get the password you can contact Hantao Liu (Hantao.Liu@tudelft.nl)
The subjective data on perceived ringing were collected with the aim to better understand where human beings perceive ringing artifacts in compressed images, and to develop a no-reference (NR) metric to predict perceived ringing annoyance in these compressed images. The data result from two perception experiments:
- the so-called ringing region experiment, and
- the so-called ringing annoyance experiment.
For the ringing region experiment, eight source images were JPEG compressed at two levels, yielding a database of 16 stimuli. Twelve participants were requested to mark any region in each stimulus where ringing was perceived, independent of its annoyance. The results were transformed into a subjective ringing region (SRR) map, indicating where in an image on average people see ringing.
For the ringing annoyance experiment, eleven source images were JPEG compressed at four levels, yielding a test database of 55 stimuli (including the originals). Twenty participants scored the annoyance of the ringing artifacts with a single-stimulus scoring method. A mean opinion score (MOS) was obtained for each stimulus.
More details on the experimental set-up and results can be found in the references given above.