基于梯度自适应光照模型的统一计算设备构架实时体绘制技术研究  

Real-time volume rendering based on gradient adaptive shading

作　　者：龚剑[1] 贠照强[1] 秦安[1] 冯前进[1] 

机构地区：[1]南方医科大学生物医学工程学院,广东广州510515

出　　处：《南方医科大学学报》2010年第9期2156-2160,共5页Journal of Southern Medical University

摘　　要：医学体绘制技术中,在组织轮廓清晰显示的前提下,同时显示组织内部和外部结构是非常困难的。因为增加透明度会造成结构之间的混淆,而剖切显示则会带来结构上下文信息的缺失。针对上述问题,提出了一种基于体素梯度的自适应光照模型,该模型中环境光等参数根据体素梯度自动调整;同时采用统一计算设备构架(Compute Unified Device Architecture)技术对算法进行加速。实验结果表明,该方法在保证实时交互的同时,能够达到保留组织上下文信息的效果。For medical image volume rendering,it is very difficult to simultaneously visualize interior and exterior structures while preserving clear shape cues.Highly transparent transfer functions produce cluttered images with many overlapping structures,while clipping techniques completely remove possibly important contextual information.To address this issue,A gradient adaptive shading based illumination model is proposed and implemented in CUDA architecture.The coefficients of ambient,diffuse and specular lighting are tuned adaptively according to gradient.The experiments show that our method is capable of preserving 3-D contextual information in medical image dataset while still show clear boundaries with real-time interactive speed.

关 键 词：体绘制 统一计算设备构架 光照模型 GPU 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]