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getNewImage.m
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getNewImage.m
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function [img,cmap,fname,fpath,userCanceled] = getNewImage(convertToDouble)
% Prompt for new image from file or workspace
%
% SYNTAX:
% [img,map,fname,fpath,userCanceled] = getNewImage(convertToDouble)
%
% INPUTS:
% convertToDouble: Binary (default = false)
% OUTPUTS:
% img, cmap: Image and corresponding colormap
% fname, fpath: filename, file path
% userCanceled: Logical, indicating whether the user canceled the operation
%
% Incorporates Scott Hirsch's UIGETVARIABLES
%
% Copyright MathWorks,Inc 2012
%
% Brett Shoelson, PhD
% brett.shoelson@mathworks.com
% 09/12/2012
% DEFAULTS
img = [];cmap = [];fname = [];fpath = []; userCanceled = false;
if nargin == 0
convertToDouble = false;
end
importopt = questdlg('Import from File or Workspace?','File Source','FILE','Workspace','Cancel','FILE');
switch importopt
case 'Cancel'
userCanceled = true;
return
case 'FILE'
filterspec = imgformats(1);
[fname,fpath] = uigetfile(filterspec, 'Select image file');
if ~ischar(fpath)
userCanceled = true;
return
end
[img,cmap] = imread(fullfile(fpath,fname));
case 'Workspace'
prompts = 'Image (MxN or MxNx3)';
inputstring = ['Please select a matrix representing your image. The ' ...
'matrix must be 2D for grayscale or black and white, or MxNx3 for RGB'];
% The convenience syntax for uigetvariables doesn't give enough
% control, so specify a validator manually
% * numeric or logical
% * 2D or 3D
% * 2D: no dimensions of length 1
% * 3D: third dimension must be length 3
validateimage = @(im) (isnumeric(im) || islogical(im)) ...
&&(ndims(im)==2 && ~any(size(im)==2) || (ndims(im)==3&&size(im,3)==3) );%#ok
img = uigetvariables(prompts,inputstring,validateimage);
if isa(img,'cell')
try
img = img{1};
end
end
if isempty(img)
userCanceled = true;
end
end
if ~userCanceled && convertToDouble
img = im2double(img);
end