How can draw point or circle in image

Hi, i'm trying to make time series point in image

i used like this

----

image1=imread('xx.jpg')

for s=1:length(aa)

rgb{s}=insertMarker(image1,[aa,bb])

imshow(rgb{s}

end

------

in this code aa and bb is pixel position ..

i want draw circle or point in image by time..

the question is two.

1. how can i draw circle of point in image pixel position.

2. what it beautiful methods to draw time series pointing

Thanks ..

want to draw like Eye Tracking.. ^^

Answer 1

[Image Analyst]

Why can't you just use plot:

hold on;
plot(x, y, 'ro', 'MarkerSize', 30);

[Jinseok Ur]

Thanks for your help ^^ circle marker is beautiful ..!