摘要
Shear—Warp算法是目前体绘制中应用很广泛的一种方法。由于它使用面采样即双线性插值的方式,忽略了与错切平面垂直方向上的深度信息,因此得到的图像在一定的角度会产生波纹失真。提出了在视角变换矩阵中引入一个可调的系数来达到消除图像波纹失真的方法,系数γ的引入只是在某些角度时会改变变形矩阵中的部分元素,即只对中间投影图像到最终图像的投影过程作了少量的调整,没有增加计算复杂度,而达到消除波纹的目的。给出了消除图像波纹前后的比较结果。
Shear -Warp algorithm is one of the most widely used Direct Volume Rendering (DVR) techniques. As the interpolation only includes one slice and overlooks the depth information, staircasing effects at some viewing angles may occurs. A new method is presented for removing the staircasing effects by introducing an adjustable factor. The factor only influences some elements of the warp matrix at some angles, which means a -little adjustment is added to the warp process while not increasing computation complexity. The comparison between the Sear-Warp method and the new one is included.
出处
《黑龙江大学自然科学学报》
CAS
2004年第1期63-66,78,共5页
Journal of Natural Science of Heilongjiang University
基金
山东省重点自然科学基金资助项目(Z2001G01)
