Converting idl to matlab and error in code

Question

hasan alhussaini 2017-8-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351740-converting-idl-to-matlab-and-error-in-code

回答： Walter Roberson 2017-8-6

Hi, I'm trying to convert IDL codes to matlab, the idea is i have dark images and flat images and i'm trying to select them both for another section of the code

I'm stuck on the idl function known as FLOAT

IDL codes

flatlist = file_search(workdir,'flat*')
nflat = n_elements(flatlist)
darklist = file_search(workdir,'dark*')
ndark = n_elements(darklist)
dark = fltarr(xsize,ysize)
flat = fltarr(xsize,ysize)
for k = 0,ndark-1 do begin
      imtemp = read_tiff(darklist(k))
      dark = dark+float(imtemp)/ndark
      ;Average dark images
endfor

Matlab version

[darklist,workdir] = uigetfile({'*.jpg;*.tif;*.png;*.gif','All Image Files';...
          '*.*','All Files'},'Select the dark image(s)','MultiSelect', 'on');
if(~iscell(darklist))
       ndark=1;
else
      ndark = numel(darklist);
end
dark = zeros(ysize,xsize);
flat = zeros(ysize,xsize);
for k = 1:ndark  
      if(~iscell(darklist))
            imtemp = imread(darklist);
      else
          imtemp = imread(darklist{k});
          dark = dark+double(imtemp)./ndark;
      end
end

I'm not sure if its double, also i'm getting this error

Error in 
        imtemp = imread(darklist{k});

help pls

Thanks

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Answer 1

Walter Roberson 2017-8-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351740-converting-idl-to-matlab-and-error-in-code#answer_277013

在 MATLAB Online 中打开

IDL's float(x) call corresponds to real(single(x)) in MATLAB. In the case where the data is known to be real-valued already (which is the case for all images except for some advanced TIFF files, and possibly some dicom files), then that would simplify to just single(x)

"also i'm getting this error"

You would not be having that error if you had used the code I gave you in https://www.mathworks.com/matlabcentral/answers/351336-error-trying-to-read-files#answer_276554

The problem is that your files are in some directory other than your current directory. I showed you earlier,

flatlist = fullfile( workdir, {flatinfo.name} );

and

darklist = fullfile( workdir, {darkinfo.name} );