1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
% -----------------------------------------------------------------------
% This file is part of the ASTRA Toolbox
%
% Copyright: 2010-2021, imec Vision Lab, University of Antwerp
% 2014-2021, CWI, Amsterdam
% License: Open Source under GPLv3
% Contact: astra@astra-toolbox.com
% Website: http://www.astra-toolbox.com/
% -----------------------------------------------------------------------
vol_geom = astra_create_vol_geom(256, 256);
proj_geom = astra_create_proj_geom('parallel', 1.0, 384, linspace2(0,pi,180));
% Create volumes
% initialized to zero
v0 = astra_mex_data2d('create', '-vol', vol_geom);
% initialized to 3.0
v1 = astra_mex_data2d('create', '-vol', vol_geom, 3.0);
% initialized to a matrix. A may be a single, double or logical (0/1) array.
A = phantom(256);
v2 = astra_mex_data2d('create', '-vol', vol_geom, A);
% Projection data
s0 = astra_mex_data2d('create', '-sino', proj_geom);
% Initialization to a scalar or a matrix also works, exactly as with a volume.
% Update data
% set to zero
astra_mex_data2d('store', v0, 0);
% set to a matrix
astra_mex_data2d('store', v2, A);
% Retrieve data
R = astra_mex_data2d('get', v2);
imshow(R, []);
% Retrieve data as a single array. Since astra internally stores
% data as single precision, this is more efficient:
R = astra_mex_data2d('get_single', v2);
% Free memory
astra_mex_data2d('delete', v0);
astra_mex_data2d('delete', v1);
astra_mex_data2d('delete', v2);
astra_mex_data2d('delete', s0);
|
