基于二维直方图局部聚类的半自动传递函数设计方法

摘要

传递函数对直接体绘制结果有重要影响,但设计合适的传递函数并非易事.通过在二维直方图中嵌入体数据的空间信息,并基于嵌入的空间信息对直方图中的散点进行聚类,然后利用聚类结果自动/半自动地生成二维传递函数.该方法避免了传统的二维传递函数设计时用户在直方图上繁琐的操作,提高了传递函数的效率和直观性.此外,多组体数据的实验结果证明了该方法的有效性和实用性.%Transfer function has significant influence on direct volume rendering,but designing of proper transfer function is not a trivial.By embedding volume spatial information into 2D histogram,and clustering 2D histogram bins according to the embedded spatial information,this paper designed transfer function automaticly/semi-automaticly according to the clustering result.The method could avoid tredious manual operation involved in traditional 2D-histogram based transfer function design method,so that it improved both efficiency and intuitiveness.Furthermore,several experiments demonstrate the method' s effectiveness and practicability.