Image Processing Reference
In-Depth Information
%Let's initialise the display colour
colormap(grey);
disp (' ')
disp ('Let us use the image of an eye.')
disp ('When you are ready to move on, press RETURN')
%read in the image
eye=imread('eye.jpg','jpg');
%images are stored as integers, so we need to double them for Matlab
%we also need to ensure we have a greyscale, not three colour planes
eye=double(eye(:,:,1));
%so let's display it
subplot(1,1,1), imagesc(eye);
plotedit on, title ('Image of an eye'), plotedit off
pause;
Image of an eye
10
20
30
40
50
60
10
20
30
40
50
60
Image of an eye
disp(' ')
disp ('We detect vertical edges by differencing horizontally adjacent')
disp ('points. Note how clearly the edge of the face appears')
%so we'll call the edge_x operator.
vertical=edge_x(eye);
imagesc(vertical);
plotedit on, title ('Vertical edges of an eye'), plotedit off
pause;
