How to plot the intensity profile along the horizontal line from edge to edge of the bar in the image?

Answer 1

[Andrew Redfearn]

Try using the interactive tool 'improfile'

% Import image
I = imread("rods1.png");

% Show image and use improfile to draw a line
figure
imshow(I)
[x,y,val] = improfile;

% Plot intensity values along line
figure
plot(val)
xlabel('Distance along line')
ylabel('Intensity')

Alternativley simply plot the value along a particular row

I = imread("rods1.png");

figure
plot(I(256,:)) % the image is 512 rows so this is halfway down the image