find and plot in a x-y graph the pixels allong the red line

hello everyone does anyone know how can i find and plot in a x-y graph the pixel values along the red line in the next pic?

Answer 1

[Jan]

See: doc improfile

[lena kappa]

i tried this

clc;
clear all;
img = imread('1.jpg');
img=imcrop(img)
sz = size(img);
endx = min(sz(1), sz(2));
h(1) = image(img);
hold on
h(2) = plot([1 endx], [1 endx], 'r');
hold off
h(2) = improfile

and i selected the red line but i got this error (h(2) = plot([1 endx], [1 endx], 'r'); gives me the red line like in the pic i postsed)

Cannot convert double value 109 to a handle

Error in addlinesimple (line 11)

h(2) = improfile

[Jan]

Why do you want to store the output of improfile in the the same array as the handles of the image and the line produced by plot? Their outputs are graphic handles, the output of improfile is numerical. Use this insteead:

result = improfile

[lena kappa]

thank you Jan!