how to plot 120 images on same figure by using loops

Suppose i need to loop the output of 120 images and show it on a figure

But in the code below it shows on separate figures:

%Load the folder in which input images exists

myfile=dir('E:\dataset\Input_images\*.jpg');

%Counts the number of files

numFiles = length(myfile)

numRows = ceil(sqrt(numFiles))

%Load the folder in which ground truth images exists

myfile1=dir('E:\dataset\GT\*.png');

%Counts the number of files

numFiles1 = length(myfile1)

numRows1 = ceil(sqrt(numFiles1))

for k = 1 : numFiles

for j = 1 : numFiles1

thisFileName = fullfile(myfile(k).folder, myfile(k).name);

thisImage = imread(thisFileName);

grey=rgb2gray(thisImage);

thisFileName1 = fullfile(myfile1(k).folder, myfile1(k).name);

thisImage1 = imread(thisFileName1);

if (numRows == numRows1)

%Segmentation of the image

seg = imsubtract(thisImage1,grey);

figure;

subplot(2,4,k);

imshow(seg);

drawnow;

end

end

end

Answer 1

[Image Analyst]

Use

plotCount = 1
for k = 1 : numFiles
    for j = 1 : numFiles1
        subplot(12, 10, plotCount);
        plotCount = plotCount + 1;
        imshow(............

etc.

Don't use figure() anywhere in that code to create a new figure.

Answer 2

[Adam Danz]

You're creating a new figure upon each iteration. I haven't sifted through all of your code and I'm not sure how 120 images are going to be placed on one figure. But the solution will be to move the call to figure() outside of the loops if you're only creating one figure. It looks like there will only be 8 subplots so I'm still not sure how you're organizing the 120 images on the same figure.

figure();                                     % <--- create figure outside of loop
for k = 1 : numFiles
    for j = 1 : numFiles1
        % ignoring bulk of code
        
        if (numRows == numRows1)
            %Segmentation of the image
            seg = imsubtract(thisImage1,grey);
            %figure;                           % <---- remove this
            subplot(2,4,k);
            imshow(seg);
            drawnow;
        end
        
    end
end

[Pravita Lekshmanan]

Sir i am getting the images on the same figure but iam not getting all the images

also the positions are also not filled in the whole figure

Please run this code sir it does not work

[Adam Danz]

I can't run the code because I don't have your png images. The title of your question is "how to plot 120 images on same figure by using loops" and that's what my answer does. If you'd like to do something different, you'll have to explain it better or perhaps share an illustration of what you'd like to do.

[Pravita Lekshmanan]

Sir i have two datasets of 120 images of thermograms and 120 images of its ground truth.

I get the ROI i.e. segmented image by subtracting ground truth from the input image as shown in the following figures:

Input thermogram:

Its Ground truth:

Segmented Image:

But i want to get all these segmented 120 images of output on the same figure and not on different figures.

I dont know how to get all these done in the same for loop using subplot

[Adam Danz]

"But i want to get all these segmented 120 images of output on the same figure and not on different figures."

I assum you want them tiled and displayed in a grid (rather than overlaying them all with transparency).

Matlab's subplot function produces a grid of subplots but with large margins. Squeezing 120 subplots onto one figure will result in tiny subplots.

Instead, I recommend using this FEX submission. tight_subplot() which allows you to more easily control the margin space.

Here's an example that produces a [12 x 10] grid of subplots with vertical and horizontal spacing of 0.005 (normalized units), bottom margin on 0.01, top margin 0.1, and left & right margins 0.01.

h = tight_subplot(12, 10, [.005, .005], [.01, .1], [.01, .01]);
for i = 1:120                         % or i = 1:length(h)
    imshow(image, 'Parent', h(i));    %specify axis handle   
end