Mori Yutaka, Nomura Takanori
Graduate School of Systems Engineering, Wakayama University, Wakayama, Japan.
Appl Opt. 2013 Jun 1;52(16):3838-44. doi: 10.1364/AO.52.003838.
In holographic displays, it is undesirable to observe the speckle noises with the reconstructed images. A method for improvement of reconstructed image quality by synthesizing low-coherence digital holograms is proposed. It is possible to obtain speckleless reconstruction of holograms due to low-coherence digital holography. An image sensor records low-coherence digital holograms, and the holograms are synthesized by computational calculation. Two approaches, the threshold-processing and the picking-a-peak methods, are proposed in order to reduce random noise of low-coherence digital holograms. The reconstructed image quality by the proposed methods is compared with the case of high-coherence digital holography. Quantitative evaluation is given to confirm the proposed methods. In addition, the visual evaluation by 15 people is also shown.
在全息显示中，人们不希望在重建图像时观察到散斑噪声。提出了一种通过合成低相干数字全息图来提高重建图像质量的方法。由于低相干数字全息术，可以获得无散斑的全息图重建。图像传感器记录低相干数字全息图，并通过计算合成全息图。为了降低低相干数字全息图的随机噪声，提出了阈值处理和峰值提取两种方法。将所提方法的重建图像质量与高相干数字全息术的情况进行了比较。进行了定量评估以证实所提方法。此外，还展示了15人的视觉评估结果。
