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Proceedings Paper

Contrast sensitivity function (CSF) and image discrimination
Author(s): Eli Peli
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Paper Abstract

In a previous study the simulation of image appearance from different distances was shown to be effective. The simulated observation distance accurately predicted the distance at which the simulated image could be discriminated from the original image. Due to the 1/f nature of natural images spatial spectra, the individual CSF used was actually tested only at one retinal spatial frequency. To test the CSF relevant for the discrimination task over a wide range of frequencies, the same simulations and testing procedure were applied to 5 contrast versions of the images. The lower contrast imags probe the CSF at lower spatial frequencies, while higher contrast images test the CSF value at higher spatial frequencies. Images were individually processed for each of 4 observers using their individual CSF to represent the appearance of the images from 3 distances where they span 1, 2, and 4 deg of visual angle, respectively. Each of the 4 pictures at the 5 contrast levels and the 3 simulated distances was presented 10 times side-by-side with the corresponding original image. Images were observed from 9 different observation distances. Subject task was to determine which of the two was the original, unprocessed images. For each simulated distance the data was used to determine the discrimination distance threshold.

Paper Details

Date Published: 19 May 1999
PDF: 7 pages
Proc. SPIE 3644, Human Vision and Electronic Imaging IV, (19 May 1999); doi: 10.1117/12.348478
Show Author Affiliations
Eli Peli, Harvard Medical School and Tufts Univ. School of Medicine (United States)


Published in SPIE Proceedings Vol. 3644:
Human Vision and Electronic Imaging IV
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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