Perceptual linearization as display standard: link between psychophysics and contrast discrimination models

Najoua Belaid; Ineke M. C. J. van Overveld; Jean-Bernard Martens

doi:10.1117/12.271285

16 April 1997 Perceptual linearization as display standard: link between psychophysics and contrast discrimination models

Najoua Belaid, Ineke M. C. J. van Overveld, Jean-Bernard Martens

Author Affiliations +

Proceedings Volume 3036, Medical Imaging 1997: Image Perception; (1997) https://doi.org/10.1117/12.271285
Event: Medical Imaging 1997, 1997, Newport Beach, CA, United States

Abstract

Given the increasing use of soft-copy in the medical field, standardization and fidelity of the display are gaining much interest. For medical imaging, it is of great importance that information in the data is accurately mapped to brightness sensation. The concept of perceptual linearization was introduced by Pizer [Computer Graphics and Image Processing, 17, 262 (1981)] to guarantee the display fidelity. It means that equal steps in the data evoke equal steps in sensation. We investigate the fidelity of achromatic displays prior to and after perceptual linearization. First, we use magnitude estimation of brightness differences between gray square patches embedded in a uniform background, to make equal-interval brightness series. Then, we extend the brightness contrast discrimination models of Whittle [Vision Research, 26, 1677 (1986)], and Kingdom and Moulden [Vision Research, 31, 851 (1991)], for gray patches in uniform background, to our supra-threshold data. A good fit is found. Finally, we apply the look-up tables that provide perceptual linearization for the gray patches to complex images. Brightness matching with a scale of reference gray patches is used to estimate gray levels at specified image locations. The experimental results indicate that the accuracy of this task is not necessarily affected by perceptual linearization.

Citation Download Citation

Najoua Belaid, Ineke M. C. J. van Overveld, and Jean-Bernard Martens "Perceptual linearization as display standard: link between psychophysics and contrast discrimination models", Proc. SPIE 3036, Medical Imaging 1997: Image Perception, (16 April 1997); https://doi.org/10.1117/12.271285

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