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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 [imdiff] = imabsdiff(im1, im2)
//check the image width and height
if( or( size(im1)<>size(im2) )) then
error("The two images do not have the same size or the same channel number.");
//return;
end
if (size(size(im1),2)>3) then
error("The two inputs are not images");
return;
end
if (size(size(im1),2)==3) then
if (size(im1, 3)<>1) & (size(im1,3)<>3) then
error("The two inputs are not images");
//return;
end
end
//must be the same class, and not be uint32
if (type(im1(1))<>type(im2(1)) | ...
typeof(im1(1))<>typeof(im2(1)) | ...
typeof(im1(1))=='uint32' ) then
error("The two input images must be of the same class and not be"+...
" uint32.");
end
//actruely abs(im1-im2) will be more efficient,
//but abs(uint8(8)-uint8(9))
//and abs(int16(2^15-1)-int16(-1)) will give error results
//(255 and -32768 respectively)
//so we have to use OpenCV cvAbsDiff function for the same type at
//these situations
//int8 is not supported by OpenCV function cvAbsDiff
//convert to int16 first when int8 class
if ( typeof(im1(1))=='constant') then //double
imdiff = abs(im1 - im2);
elseif ( typeof(im1(1))=='int8') then //int8
imdiff = abs(int16(im1) - int16(im2));
imdiff(imdiff > 127) = int16(127);
imdiff = int8(imdiff);
else
imdiff = int_imabsdiff(im1, im2);
end
endfunction
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