基于旋转二维发光二极管(LED)阵列的体三维显示系统中, 原始数据被体素化后产生灰度偏差。介绍了在扫描映射法下用几何近似法计算体素点灰度偏差。建立两组立方体模型, 通过计算它们体素化后的平均灰度偏差和灰度均方差, 分析灰度偏差对显示结果的影响。结果表明图像的灰度细节越丰富, 灰度偏差对显示结果的影响越大。一般情况下灰度偏差对显示图像的影响不大, 但当所显示的图像细节十分丰富时, 可能会因灰度偏差引起较严重的失真。除了通过改善硬件条件可减小偏差外, 还可通过优化体素化算法, 在一定程度上修正灰度偏差。给出偏差修正前后的模型仿真对照图以及实际显示的图像照片, 修正后的仿真图中少了因偏差引起的杂散点。

A three-dimensional volumetric display system was built based on two-dimensional LED array. Scan mapping method was used for data voxelizaion. Gray scale deviation was caused due to voxelization. Geometric approximation method for calculating gray scale deviation was introduced. Two groups of cube models were built and their mean gray scale deviations and root-mean-square deviations were calculated. The calculated results show that gray scale deviation affects display results more in those images that have more gray details. Display distortions may be caused in images that have plenty of gray details. Gray scale deviation could be corrected partly by improving the hardware of the system and by optimizing the voxelization algorithm. Simulating figures before and after gray scale deviation correction show that there are fewer stray points after deviation correction.