基于DMD的数字全息显示及其再现像质增强

采用DMD作为空间光调制器构建了一套数字全息显示系统.分析了数字全息图光学再现中影响再现图像质量的因素,提出了一种采用频域滤波重建高条纹对比度滤波全息图来改善其光学再现图像质量的新方法.采用信噪比及图像亮度作为评价参量,对原始全息图和滤波全息图的数值再现像进行定量分析表明,滤波后全息图的再现像质量明显优于原始全息图的再现像.基于DMD数字全息显示系统的光学再现实验也验证了理论分析结果.

Digital Holographic Display Based on Digital Micromirror Device and Quality Enhancement of Its Reconstructed Image

Digital Micromirror Device (DMD) is employed as spatial light modulator to construct a digital holographic display system.The factors affecting the reconstructed image quality are analyzed,and a new method is put forward to improve the optically reconstructed image quality by filtering in the frequency domain and rebuilding filtered hologram with high fringe visibility.The merit factors of signal-to-noise (SNR) and image brightness are introduced to evaluate the reconstructed image quality of original and filtered holograms.Theoretical results show that the reconstructed image quality of the filtered hologram is much better than that of the original hologram.The experimental results of optical reconstruction based on DMD holographic display system also agree well with the theoretical results.