利用空间光调制器实现计算全息三维显示

针对目前三维物体计算全息算法数据量大、计算速度慢及共轭像影响再现效果问题，提出一种全息体视图计算方法。根据人眼双目视差立体视觉原理，由摄像机获取三维物体不同角度的二维序列视差图像，通过计算全息算法得到多视角全息图，合成三维物体全息体视图。在迭代傅里叶变换算法的基础上，采用预设初始相位并增加反馈因子的方法，提高相息图的计算效率。基于液晶空间光调制器构建光学系统，对计算的全息体视图进行了光学再现。结果表明:该方法有效地排除了共轭像的干扰，相息图的迭代计算效率提高30%以上，再现图像与目标图像的结构相似度大于0.85。

Three-dimensional display of computer-generated hologram based on spatial light modulator

In order to solve the problems in current computer-generated hologram, such as huge computational cost, slow computational speed and disturbance from conjugate image, a new computer-generating holographic stereogram method was proposed. In this method, a series of perspective view images were captured by moving camera according to the principle of binocular stereo-vision in human visual system. The kinoform of different view angles was computed to synthesize holographic stereogram of three-dimensional object. The initial phase was set up and the feedback factor was added to iterate Fourier transform algorithm (IFTA) for improving the efficiency of iterative calculation. The holographic stereogram was loaded to liquid spatial light modulator. The experimental result shows the method we proposed can eliminate the noises from conjugate image and improve the iterative calculation efficiency over 30%, the structure similarity (SSIM) between reconstruction image and target image is above 0.85, which means the results have comfortable three-dimensional vision effect.