3 ms·
Most of the time, blurring is down with a Gaussian blur and this is, in theory, reversible. In practice what is actually done is round_to_fraction_over_256(gaus
by dan-robertson 5y ago
Most of the time, blurring is down with a Gaussian blur and this is, in theory, reversible. In practice what is actually done is round_to_fraction_over_256(gaussian_blur(point, image, …)) so there is an error in the unblurring process. But this error is often not insurmountable, especially with extra information.
- lmilcin 5y agoActually, 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).