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########################################################################
##
## Copyright (C) 2014-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave 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 3 of the License, or
## (at your option) any later version.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{frame} =} im2frame (@var{rgb})
## @deftypefnx {} {@var{frame} =} im2frame (@var{x}, @var{map})
## Convert image to movie frame.
##
## A movie frame is simply a struct with the fields @qcode{"cdata"} and
## @qcode{"colormap"}.
##
## Support for N-dimensional images is given when each image projection,
## matrix sizes of @nospell{MxN and MxNx3} for RGB images, is concatenated
## along the fourth dimension. In such cases, the returned value is a struct
## array.
##
## @seealso{frame2im}
## @end deftypefn
function frame = im2frame (x, map = [])
if (nargin < 1)
print_usage ();
elseif (ndims (x) > 4)
error ("im2frame: X and RGB must be a single image");
endif
## Matlab documentation is incorrect. Singleton 3rd dimension will error
## without cmap (no use of default cmap), and cmap is added to the frame
## even when image is RGB.
nchannels = size (x, 3);
if (nchannels == 3)
## RGB image, do nothing
elseif (nchannels == 1)
if (nargin < 2)
error ("im2frame: MAP required for indexed images");
endif
[x, map] = ind2x ("im2frame", x, map);
else
error ("im2frame: first argument must be indexed or RGB image");
endif
## support N-dimensional images and return a struct array
if (ndims (x) == 4)
x = reshape (num2cell (x, [1 2 3]), 1, size (x, 4));
endif
frame = struct ("cdata", x, "colormap", map);
endfunction
%!function f = make_rgb_f ()
%! f = randi ([0 255], 10, 20, 3);
%!endfunction
%!function f = make_ind_f ()
%! f = randi ([1 100], 10, 20, 1);
%!endfunction
%!test
%! rgb = make_rgb_f ();
%! assert (im2frame (rgb), struct ("cdata", rgb, "colormap", []));
%!test
%! ind = make_ind_f ();
%! cmap = bone (100);
%! assert (im2frame (ind, cmap), struct ("cdata", ind, "colormap", cmap));
%!test
%! rgb1 = make_rgb_f ();
%! rgb2 = make_rgb_f ();
%! rgb3 = make_rgb_f ();
%! rgb4 = make_rgb_f ();
%! assert (im2frame (cat (4, rgb1, rgb2, rgb3, rgb4)),
%! struct ("cdata", {rgb1, rgb2, rgb3, rgb4}, "colormap", []));
%!test
%! ind1 = make_ind_f ();
%! ind2 = make_ind_f ();
%! ind3 = make_ind_f ();
%! ind4 = make_ind_f ();
%! cmap = bone (100);
%! assert (im2frame (cat (4, ind1, ind2, ind3, ind4), cmap),
%! struct ("cdata", {ind1, ind2, ind3, ind4}, "colormap", cmap));
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