Read several images to work with

Question

Haimon 2013-8-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84754-read-several-images-to-work-with

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

I am trying to read several images (tomographic - grayscale) of an entire volume so I can make some quantifications.

The name of the data changes according to the number of files, e.g.,

image0001 - image0009

image0010 - image0099

image0100 - image0999

and so on...

I have written this code until now (my N is not bigger than 10000):

if N<10

     for d = 1:N
       s = ['al000' int2str(d) '.bmp'];
     end

elseif N>10 && N<100

     for d = 1:9
       s(d) = ['al000' int2str(d) '.bmp'];
     end 
     for d = 10:N
       s(d) = ['al00' int2str(d) '.bmp'];
     end

elseif N>100 && N<1000

      for d = 1:9
        s(d) = ['al000' int2str(d) '.bmp'];
      end
      for d = 10:99
        s(d) = ['al00' int2str(d) '.bmp'];
      end
      for d = 100:N
        s(d) = ['al0' int2str(d) '.bmp'];
      end

elseif N>1000 && N<10000

      for d = 1:9
        s(d) = ['al000' int2str(d) '.bmp'];
      end
      for d = 10:99
        s(d) = ['al00' int2str(d) '.bmp'];
      end
      for d = 100:999
        s(d) = ['al0' int2str(d) '.bmp'];
      end  
      for d = 1000:N
        s(d) = ['al' int2str(d) '.bmp'];
      end

end

I need to use those names, but there is an error message when I try to use s(d) instead of only s - so I could save all the names I need:

Subscripted assignment dimension mismatch.

Error in teste (line 7) s(d) = ['al000' int2str(d) '.bmp'];

My questions:

1 - How can I save all those names of the images into another variable, which I will need to access all images later?

2 - Is there a easier, faster or, maybe, smarter way to do this if, elseif and for lines? If I had a N even bigger, would I have to write it down for each interval? Or is there a code which would do the same thing I am doing just knowing my N?

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Answer 1

Walter Roberson 2013-8-14

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84754-read-several-images-to-work-with#answer_94290

在 MATLAB Online 中打开

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

for K = 1 : N
  s{d} = sprintf('image%04d.bmp',K);
end

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Answer 2

David Sanchez 2013-8-14

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84754-read-several-images-to-work-with#answer_94293

在 MATLAB Online 中打开

base_name = 'a0000.bmp';
s = cell(999,1); % initialize cell to hold names
for k=1:999
    tmp_str = num2str(k);
    L = length(tmp_str);
    base_name(6-L:5) = tmp_str;
    s{k} = base_name;
end