Slider-adjusted softcopy ruler for calibrated image quality assessment

Elaine W. Jin; Brian W. Keelan

doi:10.1117/1.3271133

1 January 2010 Slider-adjusted softcopy ruler for calibrated image quality assessment

Elaine W. Jin, Brian W. Keelan

Author Affiliations +

Journal of Electronic Imaging, Vol. 19, Issue 1, 011009 (January 2010). https://doi.org/10.1117/1.3271133

Abstract

ISO 20462 part 3 standardized the hardcopy quality ruler and a softcopy quality ruler based on a binary sort approach involving paired comparisons. The new softcopy ruler method described here utilizes a slider bar to match the quality of the ruler to that of the test image, which is found to substantially reduce the time required per assessment (30 to 15.5 s), with only a modest loss of precision (standard deviations of 2.5 to 2.9 just noticeable differences). In combination, these metrics implied a 20% improvement in the standard error of the mean achievable in a fixed amount of judging time. Ruler images calibrated against the standard quality scale of ISO 20462 are generated for 21 scenes, at 31 quality levels each, achieved through variation of sharpness, while other attributes are held near their preferred positions. The images are bundled with documentation and a MATLAB source code for a graphical user interface that administers softcopy ruler experiments, and these materials are donated to the International Imaging Industry Association for distribution. In conjunction with a specified large flat panel display, these materials should enable users to conduct softcopy quality ruler experiments with minimum effort, and should reduce the barriers to performing calibrated psychophysical measurements.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Elaine W. Jin and Brian W. Keelan "Slider-adjusted softcopy ruler for calibrated image quality assessment," Journal of Electronic Imaging 19(1), 011009 (1 January 2010). https://doi.org/10.1117/1.3271133

Published: 1 January 2010

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available