Mills Godfrey A, Yamaguchi Ichirou
Faculty of Engineering, Gunma University, 1-5-1 Tenjin Cho, Kiryu City 376-8515, Gunma, Japan.
Appl Opt. 2005 Mar 1;44(7):1216-25. doi: 10.1364/ao.44.001216.
We discuss quantization effects of hologram recording on the quality of reconstructed images in phase-shifting digital holography. We vary bit depths of phase-shifted holograms in both numerical simulation and experiments and then derived the complex amplitude, which is subjected to Fresnel transformation for the image reconstruction. The influence of bit-depth limitation in quantization has been demonstrated in a numerical simulation for spot-array patterns with linearly varying intensities and a continuous intensity object. The objects are provided with uniform and random phase modulation. In experiments, digital holograms are originally recorded at 8 bits and the bit depths are changed to deliver holograms at bit depths of 1 to 8 bits for the image reconstruction. The quality of the reconstructed images has been evaluated for the different quantization levels.
我们讨论了全息图记录的量化效应在相移数字全息术中对重建图像质量的影响。我们在数值模拟和实验中改变相移全息图的比特深度，然后推导复振幅，对其进行菲涅耳变换以进行图像重建。在针对强度线性变化的点阵列图案和连续强度物体的数值模拟中，已经证明了量化中比特深度限制的影响。这些物体具有均匀和随机的相位调制。在实验中，数字全息图最初以8比特记录，然后改变比特深度以提供比特深度为1至8比特的全息图用于图像重建。针对不同的量化级别评估了重建图像的质量。
