How to show a sequence of images

Hello everyone,

My aim is to load a directory with 300 dicom images, to show them and to choose one of all them to modify it later. What I have to do is to show one-by-one all these images, maybe moving of one to the next one with the direction controllers or something similar and when I find the right image, to take a imcrop of it.

I think the Code would be something like this:

for z=1:size(directory)
     archivo = directory(z).name;
     Im = (dicomread(archivo));
     Im=imadjust(Im);
     imshow(Im);
     XXXXXXXXXXXXXXX
     imcrop(Im)
end

I think it could be done with a "pause", but I think it would be better if I could do it more interactive with other controllers.

Could you help me?

Thank you!

Answer 1

[Adam Wyatt]

You need to either add a callback function to the image/figure to respond to user key presses or mouse clicks, or you could add something like getpts.

I would add two buttons to the figure, one states "Next" and the other "Store", and implement callbacks on those buttons (you could even add a previous).

Here is a quick example - I would implement the callbacks a bit differently and not have the while loop at the end, but it illustrates the point:

function Selected = TestFun

clf;
I = randn(100, 100, 10);

count = 1;
Selected = [];
h = imagesc(I(:, :, count));
hb1 = uicontrol('Style', 'PushButton', 'String', 'Next', ...
  'Callback', @NextBtnCB);
hb2 = uicontrol('Style', 'PushButton', 'String', 'Store', ...
  'Callback', @StoreBtnCB);
hb1.Position(2) = hb2.Position(2)+1.1*hb2.Position(4);

while isempty(Selected)
  pause(.1);
end

  function NextBtnCB(src, evnt)
    if count<size(I, 3)
      count = count + 1;
      h.CData = I(:, :, count);
    end
  end

  function StoreBtnCB(src, evnt)
    Selected = count;
  end

end

Answer 2

[Jose Andrés]

I am sorry but I am starting to work with images and I don´t know how to do this kind of things. I have the ideas but not the way to execute them. It is very difficult? Could you show me the easiest way?

Thank you!

[Adam Wyatt]

I just have - change the code inside the functions to do what you want!

[Adam Wyatt]

Sorry mate, I made a question and you answered to me yesterday. I really like your idea but I am lost with all this image function thing. I have copied the Code you post on my question in a new .m file, replacing the variable "I" for my image, but I have a lot of errors and I don´t know what to do because I don´t know how it works...

You need to be more specific. Use the documentation. for any items you do not understand. Read the sections on GUI programming and Callbacks.

[Jose Andrés]

Yes I have tried it but I haven't used GUI never and it is so difficult to me; I am looking for the easiest way to execute my idea (what I showed is what I know to do) or get the Code to learn it.

Right now, I have a MatLab file with this code:

function Selected = TestFun
clf;
I = dicomread('IM-0237-0233.dcm');
count = 1;
Selected = [];
h = imagesc(I(:, :, count));
hb1 = uicontrol('Style', 'PushButton', 'String', 'Next', ...
  'Callback', @NextBtnCB);
hb2 = uicontrol('Style', 'PushButton', 'String', 'Store', ...
  'Callback', @StoreBtnCB);
hb1.Position(2) = hb2.Position(2)+1.1*hb2.Position(4);
while isempty(Selected)
  pause(.1);
end
  function NextBtnCB(src, evnt)
    if count<size(I, 3)
      count = count + 1;
      h.CData = I(:, :, count);
    end
  end
  function StoreBtnCB(src, evnt)
    Selected = count;
  end
end

... and that's all I know to do.

Sorry but I am really lost with this.

Answer 3

[Ashish Uthama]

You could try using the image batch processor app to browse your images. You could then right-click on the image you want to select and export it to the workspace (to do further processing like cropping).