Am 06.04.2012 22:47, schrieb Alexander Görtz:
Hi,
I'm new at this list, so first hello to everyone and keep up the good work.
But now to my 'problem'. I'm using the im2double function for some grayscale
images which worked fine until I came across a 1bit black and white image. I
got the error that the input of im2double must be an image, which doesn't make
that much sens as the input actually is an image. So I would suggest to change
the error message that the input hast to be a 8, 16 uint or a double image.
Or even better make im2double work with class(img) = logical what should be
fairly easy as the only thing you need to return is double(img) as the image
already is in the range [0, 1].
Cheers,
Alexander
Can you try the attached one? If it works as expected I will send a
patch for the svn sources.
## Copyright (C) 2007 Søren Hauberg
##
## 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, 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 file. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} @var{im2} = im2double(@var{im1})
## Converts the input image to an image of class double.
##
## If the input image is of class double the output is unchanged.
## If the input is of class uint8 the result will be converted to doubles
## and divided by 255, and if the input is of class uint16 the image will
## be converted to doubles and divided by 65535.
## @seealso{im2bw, im2uint16, im2uint8}
## @end deftypefn
function im2 = im2double(im1)
## Input checking
if (nargin < 1)
print_usage();
endif
if (!isgray(im1) && !isrgb(im1) && !isbw(im1))
error("im2double: input must be an image");
endif
## Take action depending on the class of the data
switch (class(im1))
case "double"
im2 = im1;
case "logical"
im2 = double(im1);
case "uint8"
im2 = double(im1) / 255;
case "uint16"
im2 = double(im1) / (pow2(16)-1);
otherwise
error("im2double: unsupported image class");
endswitch
endfunction
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