OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 58, Iss. 7 — Jul. 1, 1968
  • pp: 985–991

Discrimination Step

ELLEN HISDAL  »View Author Affiliations


JOSA, Vol. 58, Issue 7, pp. 985-991 (1968)
http://dx.doi.org/10.1364/JOSA.58.000985


View Full Text Article

Acrobat PDF (909 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

A theoretical expression is derived for the least distinguishable step in the number of pulses from an area whose image is focused on and measured by a single photoemissive detector. For large numbers of pulses this discrimination step is found to be equal to 6.8 times the rms fluctuation of the number of pulses at the given level. For the threshold step, the 6.8 factor must be replaced by 4.1. The maximum noise-to-signal ratio is computed for the cases of sample and path noise. A formula is found for the total number of discrimination steps in a macrocell whose photon number may vary between two given limits. Satisfactory agreement is found between computed and experimental values found by other researchers for the discrimination step of temperature, the discrimination step for the eye, the number of discrimination steps in a TV picture element and the number of equal lightness steps in a grey sample as given by the formula of the original Munsell system. A theory which assumes that in observing areas of even radiance, the eye adds up the signals from neighboring retinal detectors can explain some experimental data for the eye.

Citation
ELLEN HISDAL, "Discrimination Step," J. Opt. Soc. Am. 58, 985-991 (1968)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-58-7-985

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited