Image import in -y axis

Hi,

So I am importing an image that I want to later trace points on and generate a Lagrange polynomial curve but the image is imported into the -y axis. While this may not affect my curve it can affect my constants in the curve. This is my code.

bottle=imread('bottle.png'); 
imshow(bottle) 
hold on
i=1;
n=15;
x0=0; 
y0=0; 
[x0,y0]=ginput(1);

while (i<n+1) 
    [x,y]=ginput(1);
    plot(x,y,'*r')
    xi(i,1)=x; 
    yi(i,1)=y; 
    i=i+1;
end

display (xi);
display (yi);
axis on;

Answer 1

[Image Analyst]

Please attach 'bottle.jpg'

Also use

axis ij

to flip the direction of plotting with plot(). Or else (# of rows - y) instead of y.