OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 54, Iss. 7 — Jul. 1, 1964
  • pp: 950–955

Effect of Luminance Noise on Contrast Thresholds

N. S. NAGARAJA  »View Author Affiliations


JOSA, Vol. 54, Issue 7, pp. 950-955 (1964)
http://dx.doi.org/10.1364/JOSA.54.000950


View Full Text Article

Acrobat PDF (755 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

This paper deals with the effect on contrast thresholds of the fluctuations in the background luminance or “luminance noise.” Targets of several sizes are produced on a television screen, imbedded in fine-grain luminance noise of controllable magnitude. The results indicate that luminance fluctuations of small magnitude do not affect the threshold very much when the mean luminance of the screen is 0.01 and 0.1 ft-L, while they do change it appreciably at 1.0 ft-L. When luminance fluctuations are large, contrast thresholds at the above three luminance levels are nearly the same, indicating that the degree of luminance fluctuation governs the contrast threshold.

The extent to which luminance noise increases the contrast threshold is used to estimate the internal noise of the vision channel and an attempt is made to compare this with the noise that might be expected on account of fluctuations in the number of quanta absorbed in the retina.

Citation
N. S. NAGARAJA, "Effect of Luminance Noise on Contrast Thresholds," J. Opt. Soc. Am. 54, 950-955 (1964)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-54-7-950


Sort:  Author  |  Journal  |  Reset

References

  1. J. W. R. Griffiths and N. S. Nagaraja, J. Brit. Inst. Radio Engr. 25 (3), 225 (1963).
  2. A. Rose, J. Opt. Soc. Am., 38, 196 (1948).
  3. H. B. Barlow, J. Physiol., London 136, 469 (1957).
  4. H. B. Barlow, J. Physiol., London 141, 337 (1958).
  5. R. L. Gregory, Information Theory 3rd London Symposium, September 1955 (Butterworths Scientific Publications Ltd., London, 1955), p. 287.
  6. Contrast is expressed here in dB, as 10 logC.
  7. R. E. Burgess, Phil. Mag. 42, 475 (1951).
  8. J. L. Lawson and G. E. Uhlenbeck, Threshold Signals, Radiation Laboratory Series, Vol. 24 (McGraw-Hill Book Company, Inc., New York), p. 167.
  9. Yves Le Grand, Light, Colour and Vision (Chapman & Hall, Ltd., London, England, 1957), p. 104.

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited