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// SIVP - Scilab Image and Video Processing toolbox
// Copyright (C) 2006 Shiqi Yu
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////
function [im2] = im2bw(im, thresh)
if (thresh < 0 | thresh > 1)
error("thresh should be in the range [0,1]");
end
dims = size(im);
if (size(dims,2)== 3) then
if (dims(3)<>3) then
error("The input matrix im should be MxN or M x N x 3 matrix.");
end
//convert the RGB image to gray image first
im = rgb2gray(im);
elseif (size(size(im),2)>3) then
error("The input matrix im should be MxN or M x N x 3 matrix.");
end
imtype = typeof(im(1));
select imtype
case 'boolean' then
im2 = im;
case 'uint8' then
im2 = im > uint8(round((2^8-1)*thresh));
case 'int8' then
im2 = im > int8(round((2^8-1)*thresh-128));
case 'uint16' then
im2 = im > uint16(round((2^16-1)*thresh));
case 'int16' then
im2 = im > int16(round((2^16-1)*thresh-2^15));
case 'int32' then
im2 = im > int32(round((2^32-1)*thresh-2^31));
case 'constant' then
im2 = im > thresh;
else
error("Data type " + imtype + " is not supported.");
end
endfunction
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