PJND data

The picture-wise just noticeable difference (PJND) for a given image and a compression scheme is a statistical quantity giving the smallest distortion that a subject can perceive when the image is compressed with the compression scheme. 
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To estimate the PJND efficiently, two subjective assessment methods, a slider-based method and a keystroke-based method, were introduced and compared with a traditional one, the relaxed binary search method. The flicker test was applied and the PJND for 10 selected reference images from the MCL-JCI dataset with different distortion levels were assessed. A crowdsourcing study with side-by-side comparisons and forced choice was conducted as well.

Cite us

If you use our data in your research, please cite the following reference:

@inproceedings{pjnd2020,
title={Subjective assessment of global picture-wise just noticeable
difference},
author={Lin, Hanhe and Jenadeleh, Mohsen and Chen, Guangan and Reips, 
Ulf-Dietrich and Hamzaoui, Raouf and Saupe, Dietmar},
booktitle={2020 IEEE International Conference on Multimedia \& Expo 
Workshops (ICMEW)},
pages={1--6},
year={2020},
organization={IEEE}
}
​

You can download subjective data from osf: https://osf.io/kfnq6/