how could we identify the type of blur in an image?? first, how could we realize that a image is blurred or not???

1. how could we identify an image is blurred or not and the type of blur occured??
2. if i create a blur to an image by fspecial(), can we see the matrix of psf??
3. is it possible to simulate a blur only to a particular object(portion) in an image, if so how??

can someone help me with the code too for better understanding.

Thanks in advance.....

Answer 1

[Harsh Parikh]

Hi Vimal,

You can identify the "blurriness" of the image and the parameters as well using a neural network based on multi-valued neurons as shown in the paper here which should answer the first two questions.

To blur a particular part of an image:

• Cut the part.
• Apply blurring to that part.
• Join the part back to the original image.

Refer the link1 and link2 which shows, blurring half of the image and blurring with a controlled area, respectively.

[Vimal Raj]

thank you sir.

how to find the PSF \ KERNAL of an blurred image???

[Image Analyst]

Regarding your #2, look in the workspace panel to see the numbers in your psf matrix. To visualize it, do something like this:

psf = fspecial('gaussian', 41, 11)
subplot(2, 1, 1);
imshow(psf, [], 'InitialMagnification', 800);
axis('on', 'image');
subplot(2, 1, 2);
surf(psf);

[Vimal Raj]

ok sir, thank you soo much....