Mercurial > octave
view scripts/image/frame2im.m @ 31207:1c40fc2344f4 stable
quad2d.m: Add BIST test to cset b0e90ca8e679 (bug #62972)
* quad2d.m: Add BIST test for bug #62972.
author | Rik <rik@octave.org> |
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date | Sun, 28 Aug 2022 14:19:43 -0700 |
parents | 796f54d4ddbf |
children | 597f3ee61a48 |
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######################################################################## ## ## Copyright (C) 2014-2022 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{x}, @var{map}] =} frame2im (@var{frame}) ## Convert movie frame to indexed image. ## ## A movie frame is simply a struct with the fields @qcode{"cdata"} and ## @qcode{"colormap"}. ## ## Support for N-dimensional images or movies is given when @var{frame} is a ## struct array. In such cases, @var{x} will be a @nospell{MxNx1xK or MxNx3xK} ## for indexed and RGB movies respectively, with each frame concatenated ## along the 4th dimension. ## ## @seealso{im2frame, getframe} ## @end deftypefn function [x, map] = frame2im (frame) if (nargin < 1) print_usage (); elseif (! all (isfield (frame, {"cdata", "colormap"}))) error ("frame2im: F must be a struct with the fields colormap and cdata"); endif n = numel (frame); if (n == 0) error ("frame2im: FRAME is empty"); else x = [frame.cdata]; map = frame(1).colormap; endif ## support for N-dimensional images if we receive a struct array if (n > 1) x = reshape (x, rows (x), columns (x) / n, n, size (frame(1).cdata, 3)); x = permute (x, [1 2 4 3]); endif 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, 2); %!endfunction %!test %! x = make_ind_f (); %! cmap = jet (100); %! frame = struct ("cdata", x, "colormap", cmap); %! [rx, rcmap] = frame2im (frame); %! assert (rx, x); %! assert (rcmap, cmap); %!test %! rgb = make_rgb_f (); %! frame = struct ("cdata", rgb, "colormap", []); %! [rrgb, rcmap] = frame2im (frame); %! assert (rrgb, rgb); %! assert (rcmap, []); %!test %! f1 = make_rgb_f (); %! f2 = make_rgb_f (); %! f3 = make_rgb_f (); %! f4 = make_rgb_f (); %! rgb = {f1, f2, f3, f4}; %! movie = struct ("cdata", rgb, "colormap", []); %! [rx, rcmap] = frame2im (movie); %! assert (rx, cat (4, f1, f2, f3, f4)); %! assert (rcmap, []); %!test %! f1 = make_ind_f (); %! f2 = make_ind_f (); %! f3 = make_ind_f (); %! f4 = make_ind_f (); %! ind = {f1, f2, f3, f4}; %! cmap = jet (100); %! movie = struct ("cdata", ind, "colormap", cmap); %! [rx, rcmap] = frame2im (movie); %! assert (rx, cat (4, f1, f2, f3, f4)); %! assert (rcmap, cmap);