how to do masking for multiple images in terms of {i}?

Hello, For one image I can do the masking, which is

h1 = subplot(3, 4, 7);
imshow(RGBimage)
h2 = subplot(3,4,7);
hEllipse = imellipse(gca,[10 10 50 150]);
binaryImage = hEllipse.createMask();

but what if I have multiple images and would like to do mask for each one. I am using the for loop in this case

for i = 1 : numel(folder)
     What to do ?
end

Answer 1

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

[Mahmoud]

I already defined the file and matlab is taking the images I want to process but I would like to know how to mask several images.

This is how I defined the file

folder = dir('C:\Users\Demo\WD*.png');
image = cell(1,numel(folder));
for i = 1:numel(folder);
image{i} = imread(folder(i).name);
end

I am trying to convert the ellipses I draw on each image to binary images after matlab read the rgb images I am trying to do but it didnt work

 for i = 1 : numel(folder)
 h1 = subplot(3, 4, i);
 imshow(RGBimage{i})
 h2 = subplot(3,4,i);
 hEllipse{i} = imellipse(gca,[10 10 50 150]);
 binaryImage{i} = hEllipse{i}.createMask();
  end
but this is not working

Any help?

[Image Analyst]

I wouldn't call it "folder" since the variable contains filenames, not a folder name. And you should DEFINITELY not call a variable image, since that is the name of a built-in function.

I still don't know what you want to do. Why are you saving all these images instead of operating on them in the first loop? Same question for the binary images. And what do you want to do with the binary images after you create them? Do you want to write a solid or outline ellipse into the RGB image?