How to find a pixel which is blurred in an image

Can u give me a code to find a pixel in an image which is blurred.In my logic I have select a particular set of pixel with a neighboring pixels of 3*3 matrix i.e. A single pixel neighbored by 8 neighboring pixels. I want to find that middle pixel is blurred or not. How to find that pixel is blurred or not?

[Walter Roberson]

duplicates http://www.mathworks.co.uk/matlabcentral/answers/77629-how-to-find-distorted-pixel-in-a-whole-image-in-image-restoration