Accuracy lets you change the range of samples used to approximate a Gaussian blur of a given radius. For high accuracy (e.g.,
more than 90%) samples over about twice the radius of the blur are used, while for the lowest accuracy (60%), samples over
the radius of the blur are used.
Accuracy has a range of 60% - 100%. Processing time is proportional to the range of samples, so it is quicker to process a
blur of given radius if the accuracy is lower.
The default value of 60% is rather low because high accuracy values tend to increase the true radius value of the blur. For
example, when the radius of the blur is set to 3, the operator only uses frames at most 3 before/after the current frame.
If accuracy is turned up to 98%, 7 frames on each side are used.
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