Abstract: Ray-casting algorithm is a widely recognized method for high quality direct volume rendering, but the speed of rendering is too slow. Therefore, the design of specific hardware architecture based on Ray-casting is a hot research point. But memory system becomes the bottle-neck of the whole architecture and its performance directly affects the running speed of the whole system. This paper designs a conflict-free eight-bank low-order interleaving parallel memory system VOXMEM to increase the throughput, and voxel distribution function and address computation method are also proposed. The parallel memory system is achieved based on page mode SDRAM. Satisfied results are got through the emulation experiment.

Key words: direct volume rendering, Ray-casting algorithm, low-order interleaving parallel memory system, page mode

摘要： Ray-casting算法是一种高质量的直接体绘制算法，但绘制速度过慢，因此设计基于Ray-casting算法的硬件专用体系结构已成为研究的热点。而存储系统又是制约整个体系结构的瓶颈部件，其性能的优劣直接影响整个系统的运行速度。该文针对直接体绘制中的Ray-casting算法设计了无访存冲突的八体低位交叉并行存储系统VOXMEM提高吞吐率，并提出相应的体素存储分配策略和地址计算方法。该并行存储系统采用基于页模式的SDRAM实现，并通过仿真实验获得了令人满意的结果。

关键词: 直接体绘制, Ray-casting算法, 低位交叉并行存储系统, 页模式

CLC Number: 

• TP311.13