11. 1. Detect local maxima in the entropy field
2. Discard points whose entropy are too small
3. Place initial seeds
The seed are distributed using diamond shape
template
Template based seed selection
21. Redundant streamline pruning
Low entropy region:
Fewer streamlines are needed
Large distance threshold
High entropy region:
Smaller distance threshold
If a streamline have a neighboring streamline
that is closer than threshold, the streamline is
pruned.
28. Limitations and feature work
Entropy measures consider the statistical
properties but not spatial distribution
29. Limitations and feature work
Entropy measures consider the statistical
properties but not spatial distribution
A region with high error magnitudes can still
have a low conditional entropy
30. Limitations and feature work
Entropy measures consider the statistical
properties but not spatial distribution
A region with high error magnitudes can still
have a low conditional entropy
The magnitude of vectors are not considered
Conditional entropy 的計算則是把原始向量的角度和內差向量的角度建立成 2 維的 bin , 然後根據原始向量的角度和內差向量的角度,對相對的 bin 做累加,得到 histogram , 式子中, x 是原始向量的角度, y 是內差向量的角度, 有了 histogram ,就可以計算 x of y 的機率,還有 y 的機率,然後依照公式,就可以求得 conditional entropy 。