Actually, if you can identify the exact font and exact location of each letter (as is in this case) it doesn't matter what kind of blur it is. If you assume th

Actually, if you can identify the exact font and exact location of each letter (as is in this case) it doesn't matter what kind of blur it is. If you assume the photo was made with one of the consumer applications, there are only so many popular bluring algorithms. You can brute force it quite easily by testing each character and each type of blur until you get exact match (and in many cases even inexact will suffice).