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How to get diffraction pattern (fft2) from image of double slit(jpeg image)

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I would like to obtain the diffraction pattern from double slit. How can I set all blacks to 0 and all white to 1 so that the image fairly represents double slit? Thank you.
clear all; close all; clc;
x = imread('double_slit.jpg');
x = imrotate(x,-48.9);
figure(2)
imagesc(x)
x1 = rgb2gray(x);
x1 = im2double(x1);
X =ifftshift(ifft2(fftshift(x1)));
figure(1)
imagesc(log(abs((X)).^2))
% shading interp
colormap('jet')

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Mikhail
Mikhail am 11 Nov. 2014
Bearbeitet: Mikhail am 11 Nov. 2014
After you get grayscale (2D array) Image, in order to get binary image you can use im2bw function. So you should choose threshold, and this function will set all values above it to 1, and all values below to zero. For example:
threshold=mean(mean(x));
x=im2bw(x,threshold);
You should figure out what formula for threshold is better in your particular case.

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