Double Stimulus Impairment Scale (DSIS) Subjective Experiment


The DSIS protocol displays the original and distorted images successively in the center of the screen (center of the browser here).
The original image is displayed first, and then, the distorted image follows.
The index of the current image is shown on top of the page.

The observers is asked to stare at the displayed image (original and distorted in this order) and then vote.

The vote follows a 5 point scale:

1 - Very Annoying                     
2 - Annoying                          
3 - Slightly Annoying                 
4 - Perceptible but not Annoying
5 - Imperceptible                     


This is a modified DSIS protocol.
There are no restrictions on the display time, and the observer can go back to the previous image using the "previous" button.


Test conditions:
At the beginning of the subjective experiment, the observer is asked for his name and a checkbox is here to display the playlist in a random order.
The test duration varies according to the number of displayed images.
The playlist can be seen here:
http://websubjexp.polytech.univ-nantes.fr/DSIS/data/playlist.txt

The observers should remain seated at the same distance from the screen during all the test duration.
The viewing distance should be approximately 6 times the height of the displayed images.
Once the experiment is finished, the observer can acces the resulting scores here:
http://websubjexp.polytech.univ-nantes.fr/DSIS/data/Scores_<NAME>.txt

Observers can run the experiment more than once, the collected scores will thus be appended in the results file.