准直背光集成成像显示系统的精准片源生成方法

Precise Elemental Image Array Generation Method for Collimating Backlight Integral Imaging System

随着显示技术的发展,3D显示给人们提供沉浸式体验和更加逼真的立体视觉享受。为了提高成像质量,准直背光集成成像系统可以收敛像素光线的发散角度,有效减小中心深度平面后体素的扩散趋势,进而减小重构体素尺寸,提高系统分辨率。然而,由于准直背光系统像素光线的传播路径与传统散射背光系统存在偏移,导致采样光线的像素映射错误,进而产生体素漂移和混叠,影响成像质量。因此,结合逆向光线追踪技术,提出一种精准的片源生成方法。该方法建立准直背光系统的光线传播几何,重新确定采样光线起点和方向,逆向跟踪每一条光线,使每根光线信息正确映射到对应像素。实验结果表明,该方法可以有效矫正光线偏移,解决体素飘逸和混叠问题,进而提高系统的成像分辨率。

With the development of display technology,people can get immersive experience and more realistic stereoscopic visual enjoyment from three-dimensional(3D)display.In order to improve the imaging quality,the collimating backlight integral imaging system can converge the divergence angle of pixel light,effectively reduce the tendency of voxel diffusion behind the central depth plane,thereby reducing the size of reconstructed voxels and improving the resolution of the system.However,the light propagation of collimating backlight system is different from the traditional scattering backlight system.There is deviation compared the light propagation path of both system,which leads to the pixel mapping error of the sampling light,and then induce voxel drift and aliasing.Therefore,in this paper,we propose a precise method to generate elemental image array.By combining reverse ray tracing technology,we establish the ray propagation geometry of the collimating backlight system,re-determine the starting point and direction of the sampling ray,and reversely track each rayed,so that the information of each ray is correctly mapped to the corresponding pixel.The experimental results show that the proposed method can effectively correct the light deviation,solve the problems of voxel drift and aliasing,and improve the imaging resolution of the system.