Update the ROI with drawrectangle change

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Mert Karakaya 2019-9-6

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https://ww2.mathworks.cn/matlabcentral/answers/479222-update-the-roi-with-drawrectangle-change

回答： Mert Karakaya 2019-9-16

Hi,

I'm trying to draw a shape (rectangle, circle etc.) to determine region of interest (ROI) in an image. When I use the drawrectangle function, I can get the corners of the first instance that the rectangle is drawn, however when I edit the rectangle on the figure (change size/position), it does not update the roi variable. How can I update the roi variable when the rectangle is altered in a script?

Code I use is below and I use R20109a;

temp = snapshot(cam1);

imshow(temp);

rect = drawrectangle;

roi = rect.Position;

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Dheeraj Singh 2019-9-13

在 MATLAB Online 中打开

You can try running the code in the loop for the required functionality

while true
    %when you receive an update
    x=input()
    rect = drawrectangle;
    %update roi
    roi = rect.Position;
end

OR you can use Callbacks using App Designer.

Mert Karakaya 2019-9-16

Thanks for your answer Mr. Singh,

Unfortunately, I couldn't get it to work. However, I have found a way that might be possible.

imshow(snapshot(camL)); %Show image

rect = drawrectangle; %Start draw rectangle

roi = rect.Position; %Get inital position

addlistener(rect,'ROIMoved',@roiChange); %Update if there is a change to the rectangle

function roi = roiChange(src,evt)

evname = evt.EventName;

if isequal(evname,'ROIMoved')

roi = evt.CurrentPosition; %Update roi

end

My only problem is that, I cannot get the roi output with the addlistener. I have searched the documentation for a few hours now, and I cannot figure out. How can I get the output with the addlistener?

Thanks.

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