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Computational Perception and Image Quality Lab
Data compression, image analysis, human visual system models, and natural scenes
318 Advanced Technology Research Center
School of Electrical and Computer Engineering
Oklahoma State University
Stillwater, OK 74078 USA
Phone: (405) 744-2192

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CSIQ Information

The CSIQ image database

        The CSIQ database is a new database released by our Lab. It consists of 30 original images, each is distorted using six different types of distortions at four to five different levels of distortion. CSIQ images are subjectively rated base on a linear displacement of the images across four calibrated LCD monitors placed side by side with equal viewing distance to the observer. The database contains 5000 subjective ratings from 35 different observers, and ratings are reported in the form of DMOS.

        If you use this database, please cite the following paper:
E. C. Larson and D. M. Chandler, "Most apparent distortion: full-reference image quality assessment and the role of strategy," Journal of Electronic Imaging, 19 (1), March 2010. .PDF .bibtex

This page is for the CSIQ image database, the video database can be found here.

 

Original Images:

 
Animals          
Landscape          
People          
Plants          
Urban          
 
 
 

Types of Distortion:

 Each original image in the database is distorted using six different types of distortions at four to five different levels of distortion. The distortions used in CSIQ are: JPEG compression, JPEG-2000 compression, global contrast decrements, additive pink Gaussian noise, and Gaussian blurring. This result in 866 distorted versions of original images. Examples of these distortion types are shown below:
JPEG compression     JPEG-2000 compression  
Global contrast decrements   Gaussian blurring    
Additive Gaussian white noise   Additive Gaussian pink noise  
 
 
 

Subjective Rating of Perceived Distortion:

CSIQ images are subjectively rated base on a linear displacement of the images. Four Sceptre X24WG LCD monitors at resolution of 1920 x 1200 were calibrated following sRGB color space and placed side by side with equal viewing distance to the observer. Subjects were instructed to keep the viewing distance stable of 70cm.

All of the distorted versions of an original image were viewed simultaneously across the monitor array. Each subject placed these images in the monitor array in which the horizontal distance between two images reflexes the perceived quality of them. One image placed close to another means that the subject thinks their quality is not much different. On the other hand, one image place further away to the left of another means the subject thinks the former image is much worse in quality compared to the latter. As the final step, across image ratings are realigned according to a separate, but identical, experiment in which observers place subsets of all the images linearly in space.

There are 35 observers participated in this experiment. Subjects include both male and female with normal or correct-to-normal visual acuity. Subjects' ages range from 21 to 35. Overall the database contains 5000 subjective ratings and are reported in the form of DMOS.

 
 
 

Download:

 Subjective rating: csiq.beta.xlsx

 Distorted images: dst_imgs.zip

 Original images: src_imgs.zip

 
 
 
 
This project was supported by the National Science Foundation, "Content-Based Strategies of Image and Video Quality Assessment,"

PI: Damon Chandler, Oklahoma State University; Award #0917014.

 
 
 
 
 
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