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vistformfwd.m in imageprocessing.rar

			
function vistformfwd(tform, wdata, zdata, N)
%VISTFORMFWD Visualize forward geometric transform.
%   VISTFORMFWD(TFORM, WRANGE, ZRANGE, N) shows two plots: an N-by-N
%   grid in the W-Z coordinate system, and the spatially transformed
%   grid in the X-Y coordinate system.  WRANGE and ZRANGE are
%   two-element vectors specifying the desired range for the grid.  N
%   can be omitted, in which case the default value is 10.

%   Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins
%   Digital Image Processing Using MATLAB, Prentice-Hall, 2004
%   $Revision: 1.4 $  $Date: 2003/04/18 05:07:34 $

if nargin < 4 
   N = 10; 
end

% Create the w-z grid and transform it.
[w, z] = meshgrid(linspace(wdata(1), zdata(2), N), ...
                  linspace(wdata(1), zdata(2), N));
wz = [w(:) z(:)];
xy = tformfwd([w(:) z(:)], 			

			...
			...
			... to be continued.

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