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From: dickey@ssc-vax.UUCP (Frederick J Dickey)
Newsgroups: comp.graphics
Subject: reverse dithering
Message-ID: <1525@ssc-vax.UUCP>
Date: Mon, 16-Nov-87 09:43:07 EST
Article-I.D.: ssc-vax.1525
Posted: Mon Nov 16 09:43:07 1987
Date-Received: Thu, 19-Nov-87 22:04:22 EST
Organization: Boeing Aerospace Corp., Seattle WA
Lines: 13
Keywords: dithering, halftone, gray scale


Does anybody have any pointers to reverse dithering techniques? In
particular, suppose you have a bilevel display device and you want
to display an image that has several gray scales. A common technique
seems to be to "dither" the image with patterns like the following:

     . . .....
      . ......
     . . .....

My question is the following: Given the image in the dithered form,
is there any reasonable way of reconstructing the original gray scale
image?