Error using subsindex Function 'subsindex' is not defined for values of class 'struct'.

 1 clc; clear all;  close all;
 2 image_path = '/media/wangxiao/Elements/image_segment_backup/';
 3 savePath = '/media/wangxiao/Seagate/wangxiao/additional_data/';
 4 
 5 threshold  = 5000;
 6 
 7 first_files = dir(image_path);
 8 
 9 for i = 3:length(first_files)
10     sec_file_name = first_files(i).name;
11     sec_path = [image_path, sec_file_name, '/'];
12     sec_files = dir(sec_path);
13     disp(['process the: ', sec_file_name, '---', num2str(i-2), '/', num2str(length(first_files)-2),' waiting . . . ']);
14     
15     for j = 3:length(sec_files)
16         third_file_name = sec_files(j).name;
17         third_path = [sec_path, third_file_name, '/'];
18         third_files = dir(third_path);
19         disp(['     process the: ', third_file_name, '---', num2str(j-2), '/', num2str(length(sec_files)-2),'  . . . ']);
20         
21         for k = 3:length(third_files)
22             fourth_files_name = third_files(k).name;
23             fourth_path = [third_path, fourth_files_name, '/'];
24             fourth_files = dir(fourth_path);
25             disp(['         process the: ', fourth_files_name, '---', num2str(k-2), '/', num2str(length(third_files)-2),'  . . . ']);
26             
27             for ii = 3:length(fourth_files)
28                 fifth_file_name = fourth_files(ii).name;
29                 fifth_path = [fourth_path, fifth_file_name, '/'];
30                 fifth_files = dir(fifth_path);
31                 disp(['               process the: ', fifth_file_name, '---', num2str(ii-2), '/', num2str(length(fourth_files)-2),'  . . . ']);
32                 
33                 for jj = 3:length(fifth_files)
34                     six_file_name = fifth_files(jj).name;
35                     six_path = [fifth_path, six_file_name, '/'];
36                     six_files = dir([six_path, '*.jpg']);
37 %                     disp(['                   process the: ', six_file_name, '---', num2str(jj-2), '/', num2str(length(fifth_files)-2), '  . . . ']);
38                     
39                     for kk = 1:length(six_files)
40                         seven_file_name = six_files(kk).name;
41                         image = imread([six_path, seven_file_name]);
42                         
43                         imshow(image);
44                         
45                         [width, length, channel] = size(image);
46                         %   disp(sec_file_name);
47                         %   disp(third_file_name);
48                         %   disp(fourth_files_name);
49                         %   disp(fifth_file_name);
50                         %   disp(six_file_name);
51                         %   disp(seven_file_name);
52                         resolution = width * length ;
53                         
54                         if (resolution > threshold)
55                             imwrite(image, [savePath, seven_file_name]);
56                         end
57                         
58                         
59                     end
60                     
61                     
62                     
63                     
64                     
65                 end
66                 
67                 
68             end
69             
70             
71         end
72         
73     end
74     
75 end

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