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How to load image through dialog box

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Latifa Bouguessaa 2022-6-14

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评论： Simon Chan 2022-6-14

I hope. you can help me

I need to write code that reads and processes Dicom images.

The idea is that the uigetfile function selects the images from the folder and then displays and saves them for further processing

Code to select image from folder

[fileName,filePath] = uigetfile('*', 'Select data file', '.');

Now I don't know how to display the selected image. It didn't work with the imshow function

Do you have an idea.

Many Thanks

Latifa

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Voss 2022-6-14

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Are you using dicomread to read the image file?

https://www.mathworks.com/help/images/ref/dicomread.html

Latifa Bouguessaa 2022-6-14

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Yes, I tried with the dicomread function. Here is my attempt but it doesn't work

[fileName,filePath] = uigetfile('*', 'Select data file', '.');
X = dicomread('.dcm');
imshow(X,'DisplayRange',[]);

Thank you Mr Voss

Simon Chan 2022-6-14

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You may need to use the following to read the data.

X = dicomread(fullfile(filePath,fileName));

Latifa Bouguessaa 2022-6-14

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编辑：Latifa Bouguessaa 2022-6-14

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Hello Simon Chan,

Thank you very much for your help.

now my code works. i can select and display the dicom image.

Unfortunately, the Dicominfo function does not work. Here's my code:

[fileName,filePath] = uigetfile('*', 'Select data file', '.');
X = dicomread(fullfile(filePath,fileName));
imshow(X,'DisplayRange',[]);
info = dicominfo('fullfile(filePath,fileName).dcm');
Potong=info.RescaleIntercept;
Miring=info.RescaleSlope;
FV=info.ReconstructionDiameter;
Spasi=info.PixelSpacing;

Thanks again for your help

Simon Chan 2022-6-14

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编辑：Simon Chan 2022-6-14

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Similar to function dicomread, use the following:

info = dicominfo(fullfile(filePath,fileName));

Walter Roberson 2022-6-14

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Also you should be using isfield() to check whether RescaleSlope is present before using it. Not all CT images have it; assume slope 1 and intercept 0 if not present.

Latifa Bouguessaa 2022-6-14

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Hello Simon Chan,

Thank you very much for your help.

Is there a way to select or cut out a ROI in the displayed image with the mouse

Best wishes

Latifa

Simon Chan 2022-6-14

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Depends on what kind of ROI you would like to select.

If you want a rectangular ROI, you may use drawrectangle.

Latifa Bouguessaa 2022-6-14

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ROI.png

great

it works with ROI

how can I save and process this ROI as a matrix?

Thanks so much

Simon Chan 2022-6-14

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Try this:

roi = drawrectangle;
croppedX=X(round(roi.Position(2):(roi.Position(2)+roi.Position(4))),round(roi.Position(1):(roi.Position(1)+roi.Position(3))));

Latifa Bouguessaa 2022-6-14

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great

It works.

my code should work like this. Start the program, select the image in the dialog box, select the ROI with the mouse and then process it. The problem is with ROI selection, because at this step somewhere in the pause phase until ROI is selected and then processed to the step

Do you have an idea how to realize it

Thank you very much

Simon Chan 2022-6-14