matlab - Using a clear portion of the picture to recreate a PSF -


i'm trying unblur blurred segments of following picture.

enter image description here

the original psf not given, proceeded analyse blurred part , see whether there word make out. found out make out "of" in blurred section. cropped out both the blurred "of" , counterpart in clear section -> seen below.

enter image description here

i thought through lectures in fft divide blurred(frequency domain) particular blurring function(frequency domain) recreate original image.

i thought if unblurred(frequency domain)\blurred(frequency domain), original psf retrieved. please advise on how this.

this code.

img = im2double(imread('c:\users\adhil\desktop\matlab pics\image1.jpg'));  blurred = imcrop(img,[205 541 13 12]);  unblurred = imcrop(img,[39 140 13 12]);    ub = fftshift(unblurred);  ub = fft2(ub);   ub = ifftshift(ub);     f_1a = zeros(size(b));  idx = 1 : size(blurred, 3)      b = fftshift(blurred(:,:,idx));      b = fft2(b);       b = ifftshift(b);        uba = ub(:,:,idx);      tmp = uba ./ b;       tmp = ifftshift(tmp);       tmp = ifft2(tmp);       tmp = fftshift(tmp);       [j, p] = deconvblind(blurred,tmp);        end          subplot(1,3,1);imshow(blurred);title('blurred');  subplot(1,3,2);imshow(unblurred);title('original unblurred');  subplot(1,3,3);imshow(j);title('attempt @ unblurring');

this code, however, not work, , i'm getting following error.

error using deconvblind  expected input number 2, initpsf, real.    error in deconvblind>parse_inputs (line 258)  validateattributes(p{1},{'uint8' 'uint16' 'double' 'int16' 'single'},...    error in deconvblind (line 122)  [j,p,numit,dampar,readout,weight,sizei,classi,sizepsf,funfcn,funarg] = ...    error in test2 (line 20)      [j, p] = deconvblind(blurred,tmp);

is way recreate original psf?


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