How to display an existing ROI on an image (Copy an ROI to another image)

Hi, Guys,

I have 2 images with the same size. An ROI was drawn on 1st image. I want to display this ROI on 2nd image. The key is to display this ROI at the same location on 2nd image. Please see the following example.

% Read 1st image and display it

i1 = imread('cameraman.tif');

figure(1)

imshow(i1);

h=imellipse; % Draw ROI on 1st image

% Read 2nd image and display it

i2 = imread('cameraman.tif');

figure(2)

imshow(i2);

How to copy the ROI generated on 1st image (h) to Figure (2) and display it? Thank you!

Answer 1

[Joseph Cheng]

with the h = imellipse; you can get the points by doing

vert = getVertices(h)
figure(2),imshow(i2),hold on;
plot(vert(:,1),vert(:,2))

[YZ]

Thank you very much! One following question: How to increase the line width? Thank you.

[Joseph Cheng]

That shows most parameters you can change for your plot. Additionally you can look at the plot documentation in the link below.

plot(x,y,'--gs',...
    'LineWidth',2,...
    'MarkerSize',10,...
    'MarkerEdgeColor','b',...
    'MarkerFaceColor',[0.5,0.5,0.5])

http://www.mathworks.com/help/matlab/ref/plot.html

[Surya Gnyawali]

It doesnt work with imrect. Can you please explain me why?