how can make a dataset of images?

I provided a code that gets an initial image as input and gives me 4 images as result. I should run this code as loop that user enters an initial images. in this loop every time I should save all the results because I want to make a dataset of these images and then do feature extraction. how can I do this? Can I use structure for this? I think that we can imagine every image as a matrix but I don't how we can do this .I think I should have a dataset of images like this:

but I dont know how can make this.do you think this idea is rational?or I should change my approach.

I appreciate your helps and supports in advanced.

Answer 1

[Walter Roberson]

A struct is fine.

datastruct = struct('IMG1', [], 'IMG2', [], 'IMG3', [], 'IMG4', []);
while true
  [filename, pathstr] = uigetfile('Select an image');
  if ~ischar(filename)   %user canceled
    break;
  end
  fullname = fullfile(pathstr, filename);  %it might not be in current directory
  ... process file named by fullname
  datastruct(end+1).IMG1 = image1;
  datastruct(end).IMG2 = image2;
  datastruct(end).IMG3 = image3;
  datastruct(end).IMG4 = image4;
end

[jack nn]

thanks dear Walter Roberson .

Answer 2

[Image Analyst]

Why can't you do feature extraction immediately after you create them, and not worry about saving these intermediate images? Why do you have to save them all? If, for some reason you do, then I'd just save them in .mat files until you need them at some later time.

[jack nn]

thanks.because maybe,these features not be suitable and if I can't get the the result that I want, I am forced to change them. so if I save my images, it is easier for me. about .mat I can't understand?Is there any way?I think that the only way is structure!!! I appreciate your helps and supports in advanced.

[Walter Roberson]

You could also use cell arrays:

datacell{end+1} = {image1, image2, image3, image4};

and then datacell{K}{3} for the third image of the K'th set.

[jack nn]

thanks dear Walter Roberson and Image Analyst. I did in this way :

    datastruct = struct('IMG1', [], 'IMG2', [], 'IMG3', [], 'IMG4', []);
  ..............................my loop code........................................
  datastruct(end+1).IMG1 = img1;
  datastruct(end).IMG2 = img2;
  datastruct(end).IMG3 = img3;
  datastruct(end).IMG4 = img4;

and after four iteration my dataset is like below do you think it is right for dataset?

I appreciate your helps and supports in advanced.

[Walter Roberson]

I suggest starting with

      datastruct = struct('IMG1', {}, 'IMG2', {}, 'IMG3', {}, 'IMG4', {});

[jack nn]

thanks dear.yes you are right.

[Bheki Ngobe]

Hi

I am trying out this code, but how I tell matlab the location of my images ? (I am them stored in a folder). Thanks in advance

[Image Analyst]

Bheki, see the second code chunk in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Alternatively, see this to get up to speed quickly with a nice GUI: http://www.mathworks.com/matlabcentral/fileexchange/24224-magic-matlab-generic-imaging-component

Answer 3

[mukul jain]

algorithm for identifying near surface/sub surface targets using hyperspectral image through Matlab. please guide me

[Walter Roberson]

Please create a new Question for that topic; it has nothing to do with this Question.

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer