Article View: sci.image.processing
Article #434Re: ccd camera
From: Mark Shortis
Date: Tue, 08 Sep 1992 10:38
Date: Tue, 08 Sep 1992 10:38
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1818 bytes
Would anyone like to comment on the problem of calibrating the radiometry of individual pixels in a CCD array? Essentially the problem is that for applications which require accurate radiometry (ie accurate grey levels are needed) the response of each pixel becomes important. This is the classic issue of "flat fielding". That is, if you supply a perfectly uniform input, the response of every pixel can be calibrated. Do this at two light levels and an offset and gain for each pixel can be computed. How do you create such a flat field? Perfectly uniform light sources don't grow on trees! If I get any individual replies I will post a summary. Mark. ____________________________________________________________________ Dr. Mark R. Shortis, Mark_Shortis@mac.unimelb.edu.au Senior Lecturer, Dept. of Surveying and Land Information, University of Melbourne, Telephone +613 344 6401 Parkville 3052, AUSTRALIA. Facsimile +613 347 2916 "Any sufficiently advanced technology will be indistinguishable from magic" : Robert A. Heinlein ____________________________________________________________________
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Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!ariel!sunrise.sli.unimelb.edu.au!mark From: mark@sunrise.sli.unimelb.edu.au (Mark Shortis) Newsgroups: sci.image.processing Subject: Re: ccd camera Summary: Flat fielding problem Keywords: CCD cameras, radiometric calibration, flat field Message-ID: <3093@ariel.its.unimelb.EDU.AU> Date: 8 Sep 92 10:38:59 GMT References: <jecome01.715798061@starbase.spd.louisville.edu> <18e1vpINN9m2@network.ucsd.edu> Sender: news@ariel.its.unimelb.EDU.AU Reply-To: mark@sunrise.UUCP (Mark Shortis) Organization: University of Melbourne, Dpt of Surveying and Land Information Lines: 31