CAJ | 학술논문

空间信息对揭示体数据内部特征具有重要意义，传统基于传递函数的直接体绘制法难以有效利用空间信息。对于基于直方图的传递函数，文章提出基于特征的空间一致度概念以刻画特征的空间特性———体素的空间聚集度，并提出考虑空间一致度的自适应光线投射法，该方法能基于空间一致度自动调节颜色和不透明度以优化绘制结果，并通过上述方法将空间信息引入到直接体绘制。多个实际体数据的测试结果表明，文中所提出的方法能有效考虑体数据的空间特性，可优化绘制结果。
공간신식대게시체수거내부특정구유중요의의，전통기우전체함수적직접체회제법난이유효이용공간신식。대우기우직방도적전체함수，문장제출기우특정적공간일치도개념이각화특정적공간특성———체소적공간취집도，병제출고필공간일치도적자괄응광선투사법，해방법능기우공간일치도자동조절안색화불투명도이우화회제결과，병통과상술방법장공간신식인입도직접체회제。다개실제체수거적측시결과표명，문중소제출적방법능유효고필체수거적공간특성，가우화회제결과。
Spatial information is of great significance for revealing the internal features of volume data .The tra‐ditional direct volume rendering (DVR) based on transfer function is difficult to use the spatial information ef‐fectively .In this paper ,the spatial information is introduced into direct volume rendering through the follow‐ing two aspects .Firstly ,for the transfer function based on histogram ,the spatial coherence based on features is put forward to describe the space characteristic of features ,which indicates the spatial gathering degree of voxels .Secondly ,the adaptive ray casting method considering the spatial coherence is proposed .T he method can automatically adjust the color and opacity based on space coherence to optimize the rendering results .The test results of various volume data prove that the proposed method can effectively consider the spatial charac‐teristic of volume data and optimize the rendering results .