How to overlay randomized point grid on photo?

I need to take a randomized point grid with the code:

x=rand(1,50)*5

y=rand(1,50)*5

scatter(x,y)

And overlay it onto a picture. I am not sure if this can be done or how to do it? Any help would be appreciated!

[Jonathan Chin]

im=imread('peppers.png');
imshow(im);
hold on
x=rand(1,50)*512

y=rand(1,50)*384

scatter(x,y)

Answer 1

[Cedric]

 I = imread( 'MyImage.png' ) ;
 x = rand( 1, 50 ) * size( I, 2 ) ;
 y = rand( 1, 50 ) * size( I, 1 ) ;

 imshow( I ) ;
 hold on ;
 scatter( x, y ) ;

[Cedric]

Is this answer working for you? If so please [Accept it]. If not, I am happy to provide more information.