img= imread('Image.bmp');
img= rgb2gray(img);
imshow(img);
pt = ginput(4); % the function ginput is used to get the
input from mouse
x1 = pt(1,1);
y1 = pt(1,2);
x2 = pt(2,1);
y2 = pt(2,2);
x = [x1 x2];
y = [y1 y2];
line(x,y);
x3 = pt(3,1);
y3 = pt(3,2);
x4 = pt(4,1);
y4 = pt(4,2);
x = [x2 x3];
y...