Extract point spread function from an Image, and Converting it into Line spread function

I am trying to perform Modulation Transfer Function(MTF) with the help of an Image captured by smart phone. I got confused to determine PSF from entire image and how to do Intergration of PSF to obtain from image to convert it into Line spread function. I am going to use this image to perform point spread funciton.

image_na=imread(image_path)

imagesc(image_na), colormap(gray);

figure

esfh = image_na(800:2600, 900:2700);

imagesc(esfh),colormap(gray)

figure

[X,Y]=meshgrid(1:size(esfh), 1:size(esfh));

mesh(X,Y,esfh) %display mesh plot

grid on;

grid minor;

Could you please help me to figure out this problem.

[KALYAN ACHARJYA]

If you don't know the original PSF, which is used for blurring the image, in such case you can try with different filter function (fspecial function) to find out, which actually works in this case.

Answer 1

[Image Analyst]

You'd have to take a photo of a target such as the Air Force 3-bar test patterns or the radial star target.