Matlab how to read txt data in a specific format into the workspace

Question

Yuzhen Lu 2016-10-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307226-matlab-how-to-read-txt-data-in-a-specific-format-into-the-workspace

编辑： Yuzhen Lu 2016-10-14

My txt file is organized in the following format:

image filename
n (number of objects of interest in the image) 
bounding box for object 1
bounding box for object 2
...
bounding box for object n

For example, the contents in the txt file are listed as follows:

 images/1.jpg
 1
 39.284331   23.721327   88.000000   135.915360
 images/2.jpg
 4
 107.912089  129.898400  62.372022   89.263200
 186.266100  61.768245   64.831800   106.847910
 298.909724  34.289100   73.830894   105.977200
 135.454600  -63.205613  109.739600  176.375026
 images/3.jpg
 2
 136.462492  18.762699   121.522126  187.348778
 333.601798  18.139177   104.944018  155.239682

Now I want to read the data file into a structure data (N*1, where N is equal to the number of images) with three fields, file name, number of objects and bounding box. Is there some efficient way to achieve that?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2016-10-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307226-matlab-how-to-read-txt-data-in-a-specific-format-into-the-workspace#answer_238900

编辑：KSSV 2016-10-14

在 MATLAB Online 中打开

fileID = fopen('yourfile.txt','rt');
data = textscan(fileID,'%s','delimiter','\n');
C = data{1} ;
fclose(fileID);
IdxC = strfind(C, 'images');
Idx = find(not(cellfun('isempty', IdxC)));
nimages = length(Idx) ; % total number of images 
iwant = struct ;    % initialize structure
for i = 1:nimages-1
    iwant(i).name = C{Idx(i)} ;
    iwant(i).no_objects = str2num(C{Idx(i)+1}) ;
    iwant(i).bounding_box = C((Idx(i)+2):(Idx(i+1)-1)) ;
end
 iwant(nimages).name = C(Idx(nimages)) ;
 iwant(nimages).no_objects = C(Idx(nimages)+1) ;
 iwant(nimages).bounding_box = C(Idx(nimages)+2:end) ;