多通道快速GPU光线投射算法  

Multi-pass fast GPU ray-casting algorithm

作　　者：林仁回[1] 冯前进[1] 罗博博 贠照强[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：《计算机工程与设计》2014年第9期3179-3184,共6页Computer Engineering and Design

基　　金：国家863高技术研究发展计划基金项目(2012AA02A616);国家科技支撑计划基金项目(2012BAI14B02)

摘　　要：现有基于GPU加速的光线投射算法为满足实时交互的需求,通常在用户交互过程中,采用降低采样频率的方法来提高重建速度,却丢失了三维数据场的信息,极大降低了重建图像的质量.针对这一问题,在分析GPU渲染管道线和图像插值重建技术的基础上,提出多通道快速GPU光线投射算法.利用离屏渲染技术,设置比显示分辨率低4-16倍的渲染分辨率,在此渲染分辨率下进行正常采样的光线投射算法,将渲染分辨率下重建结果重新作为输入,进行高分辨率重建,并显示结果.实验结果表明,该方法可以在满足重建图像质量的前提下,有效提高重建速度.Usually in the user interaction process, GPU-accelerated ray casting algorithms reduce the sampling frequency and improve the reconstruction speed to meet the needs of the real-time interaction. These methods seriously lose three-dimensional data inside the information and greatly reduce the quality of the reconstructed image. To solve this problem, the GPU rendering pipeline and image interpolation reconstruction techniques were analyzed, and a multi-pass fast GPU ray-casting algorithm was proposed. The off-screen rendering technology was used, and the rendering resolution was set 4-16 times lower than the display resolution for the normal ray-casting algorithm execution. The result of the low-resolution reconstruction was set as the input for the image interpolation reconstruction and then the result was displayed. The experimental results show that this method can ensure the quality of the reconstructed image, effectively improve the speed of the reconstruction.

关 键 词：图形处理单元 光线投射 帧缓存 多分辨率 Catmull-Rom插值 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]