open multiple pictures from a list with for loops

Hello,

I have the following problem:

I have a huge pool of pictures of which every participant in an experiment saw a portion of. Every participant has it's indiviual StimulusList in which all pictures are listed which they saw.

My goal is to enter the StimulusList of one participant and to see all the pictures he/her saw. I don't care if they open in separate windows or if I click through them (like in a gallery) (altough I'd prefer the latter version).

I have coded the following: The code works (no errors) but it only opens one picture.

All files (StimulusLists and Pics) are stored in the same WD.

clc 
clear

load VP_001_StimulusList.mat; %enter StimulusList here
StimulusList = struct2table(StimulusList);

StimulusList.num = num2str(StimulusList.num, '%03d'); %add leading zeros (in the StimulusList there are no leading
%zeros but in the file names of the pics there are, hence I added them)

StimulusList.pic = strcat(StimulusList.type, '_', StimulusList.num); %the filenames of the pics are always set up as
%following negative[or]neutral_XXX, the negative[or]neutral condition and
%the number are stored in different collumns of the StimulusList, hence I
%used strcat()


for i = height(StimulusList)

    file = StimulusList{i,4};
    file_cat = strcat(file, '.jpg');
    file_cat = string(file_cat);
    img = imread(file_cat);
    figure, imshow(img); 
    
end

%the loop works but it only opens one window and one picture

Thank you for your help!

and happy new year :)

Answer 1

[Voss]

for i = height(StimulusList)

should be:

for i = 1:height(StimulusList)

[Tim Dreßler]

Oh wow what a stupid mistake, I am sorry, should've seen that. I'll fix it and try if it works.

[Voss]

Don't worry about it; I've made the same mistake plenty of times.

Let me know if that fixes it.

[Tim Dreßler]

Yeah it does! Thank you. Now it opens each pic in a new window. Do you know solution which opens one window but lets me click through the pictures? The way it works know is also fine but if there is a solution to do it like i described would be nice.

[Voss]

Maybe putting a pause statement after imshow(img), and creating only one figure at the beginning, would be sufficient:

figure
for i = 1:height(StimulusList)
    file = StimulusList{i,4};
    file_cat = strcat(file, '.jpg');
    file_cat = string(file_cat);
    img = imread(file_cat);
    imshow(img); 
    pause
end

You wouldn't be able to click back and forth, but pause will wait for you to hit a key before continuing and showing the next image in the same figure.

Other than that, if you have the Image Processing Toolbox, you can use ImageBrowser:

https://www.mathworks.com/help/images/ref/imagebrowser-app.html

Other than that, you could build your own GUI with a couple of buttons (Next, Previous) and an axes for the image.

https://www.mathworks.com/matlabcentral/answers/483657-how-to-create-a-gui

[Tim Dreßler]

The pause option is already nice but I'll try to build a little GUI - Thank you so much - made my night

[Voss]

You're welcome!