Please check wavelength code which it correct or not?

This image is the wavelength from the video that i calculated only red channel but I'm not sure that the code is correct or not?

redchannel = frame(:, :, 1);
len=length(redchannel);
n=0:len-1;
N=n*fs/(len-1);
F = fft2(redchannel);
F = fftshift(F);
F = abs(F);
F = log(F+1);
F = mat2gray(F);
plot(N,F)

[Image Analyst]

Maybe. It does what you told it to do - plot spatial frequencies for every row. What do you want it to do?

Answer 1

[kantapon sumontha]

what i want to do is to find image wavelength