What code can I use to get a signal from the image?

Can I use another code besides this one?

YourSignal = original(:);

plot(YourSignal);

Answer 1

[Hiro Yoshino]

Taks this as an example.

im = imread("coins.png");
imshow(im);

if you want to convert the matrix into either row or column vector:

im_row = reshape(im,1,[])

im_row = 1×73800

49 47 48 48 48 48 48 51 50 51 50 47 49 50 50 50 49 49 49 51 50 51 51 49 49 50 51 50 51 50

im_col = reshape(im,[],1)

im_col = 73800×1

49 47 48 48 48 48 48 51 50 51

if you just swap the row and column (n x m >> m x n)

im_reshape = reshape(im,size(im,2),size(im,1));
imshow(im_reshape);

Note that the pixels are numbered from top to bottom and from left to right.