If blur is a strictly mathematical and deterministic operation, which it often is, then reversing it should be possible. Remember that a pixel is only a bunch o

If blur is a strictly mathematical and deterministic operation, which it often is, then reversing it should be possible. Remember that a pixel is only a bunch of numbers. Even non-mathematic blur should be possible... And the reason for that is small variations in the blur still exist and give away (with varying amounts of certainty) which shapes could be put together to form the resulting blurry pattern. But yes, information is actually lost in the sense that more than one image can potentially be the used to generate the same blurry pattern, and there is also limited precision to each pixel.