Looping through 4 Images that have fixed names

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

Answer 1

[Bjorn Gustavsson]

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

[Jason]

Thanks

[Jason]

Actually, its not working. My images are in memory not on disk. i.e in appdesigner

properties (Access = public)

ROI_C % 4 corners and central ROI's stored for later use

ROI_TL

ROI_TR

ROI_BL

ROI_BR

I assign different images to these via app.ROI_C=IM.

So when I come to do an imshow on these, I get:

The parameter, app.ROI_C, is not recognized by imageDisplayParsePVPairs

[Jason]

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]

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

Answer 2

[the cyclist]

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.

[Jason]

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]

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

Answer 3

[Walter Roberson]

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

[Jason]

Thanks Walter, but I had worked it out - sorry I I've already accepted the previous answer