Looping through 4 Images that have fixed names

Question

Jason 2021-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/1572228-looping-through-4-images-that-have-fixed-names

评论： Bjorn Gustavsson 2021-10-27

Hello. I have 4 images in memory that I want to loop through and perform some analysis on. I can't find a way to do this. The image names (that are held in memory) are always the same names.

IMList=app.IM1, app.IM2, app.IM3, app.IM4

Thanks

Jason

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Answer 1

Bjorn Gustavsson 2021-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/1572228-looping-through-4-images-that-have-fixed-names#answer_817113

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You can for example put the filenames into a cell-array:

imFileNames = {'im1.jpg','im2.png','im3.jpeg','im5.tiff'};

Then you can easily load the images one-by-one and do the single-image analysis on each:

for iIm = 1:numel(imFileNames)
  currIm = imread(imFileNames{iIm});
  results = fancy_img_processing(currIm);
end

HTH

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Jason 2021-10-26

It is working once I change to this:

imList = {app.ROI_C,app.ROI_TL,app.ROI_TR,app.ROI_BL,app.ROI_BR};

Bjorn Gustavsson 2021-10-27

Sloppy reading by me, fortunately close enough for you to turn it into a solution!

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Answer 2

the cyclist 2021-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/1572228-looping-through-4-images-that-have-fixed-names#answer_817103

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IMList="app.IM"+(1:4)
IMList = 1×4 string array
    "app.IM1"    "app.IM2"    "app.IM3"    "app.IM4"

creates a 1x4 string array, and then you can loop through that array to use the names.

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Jason 2021-10-26

Thankyou, but I'm sorry but I simplied my naming. My actual images are called:

app.ROI_C

app.ROI_TL

app.ROI_TR

app.ROI_BL

app.ROI_BR

Bjorn Gustavsson 2021-10-26

Then dont bother faffing about, simply put the filenames into a cell-array. See my answer.

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Answer 3

Walter Roberson 2021-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/1572228-looping-through-4-images-that-have-fixed-names#answer_817188

在 MATLAB Online 中打开

IMList = {app.IM1, app.IM2, app.IM3, app.IM4};
nimg = length(IMList);
for K = 1 : nimg
  IM = IMList{K};
 
  app.ROI_C = IM;   %or whatever
  %more stuff
end