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How to show a sequence of images

Asked by Jose Andrés on 31 Mar 2015
Latest activity Commented on by Jose Andrés on 2 Apr 2015
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!

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3 Answers

Answer by Adam Wyatt on 31 Mar 2015
Edited by Adam Wyatt on 31 Mar 2015

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

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Answer by Jose Andrés on 31 Mar 2015
Edited by Jose Andrés on 31 Mar 2015

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!

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

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Answer by Ashish Uthama on 31 Mar 2015

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).

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