Path: utzoo!attcan!uunet!mailrus!cs.utexas.edu!helios!cs.tamu.edu
From: guansy@cs.tamu.edu (Sheng-Yih Guan)
Newsgroups: comp.graphics
Subject: gray-level interpolation
Message-ID: <8536@helios.TAMU.EDU>
Date: 26 Sep 90 05:45:43 GMT
Sender: usenet@helios.TAMU.EDU
Organization: Computer Science Department, Texas A&M University
Lines: 34


Hi,

Does there exist a canned method to solve the gray level interpolation
for a deformed image.  The deformation is quivalent to a mapping which
may be expressed as
          x' = r(x, y)
and
	  y' = s(x,y).

If r(x, y) and s(x, y) were known analytically it might be possible in
principle to find non-integer values for (x, y) given integer values
of the coordinates(x', y').  Then methods such as bilinear interpolation,
cubic convolution interpolation may be applied for calculating the gray
level at (x', y').

The deformation I am interested in has no easy way to find the inverse
mapping.  So, the question is how am I going to solve the gray-level
assignment for my deformed image efficiently and systematically.  

Any suggestion or helpful hints ?  Please email me at 
	stanley@visual1.tamu.edu

Thanks in advance!

-Stanley

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