How to select x,y a coordinates from two points in image?

I have two points in an image, these two points like as min and max values. I want to fix coordinates of these two points

Answer 1

[Alessandro Masullo]

You can use the function max, together with ind2sub.

[ibrahim]

i want to select x-y coordinates for max and min values in the image, if i know the direction of image and i have (0,0)as origin point not that