Tian Songzhi, Chen Lizhi, Zhang Hao
Appl Opt. 2022 Feb 10;61(5):B17-B24. doi: 10.1364/AO.441095.
Ringing artifacts are the main noise sources in holographic projection when the quadratic phase is introduced to suppress speckle noise. In this study, the mechanisms of ringing artifacts on reconstructed images are theoretically analyzed, which illustrates the ringing artifacts are related to the bandwidth properties of the reconstructed wave field. Based on the frequency analysis, a band-limited iterative algorithm is proposed to optimize the phase hologram in the Fresnel domain. The proposed method can effectively suppress the ringing artifacts as well as the speckle noise of the Fresnel hologram by optimizing the phase distribution with bandwidth constraint. Numerical simulations and optical experiments have been performed to validate the proposed method for providing quality reconstructions in lensless holographic projection.
当引入二次相位来抑制散斑噪声时，振铃伪像是全息投影中的主要噪声源。在本研究中，从理论上分析了重建图像上振铃伪像的产生机制，结果表明振铃伪像与重建波场的带宽特性有关。基于频率分析，提出了一种带限迭代算法，用于在菲涅耳域中优化相位全息图。该方法通过在带宽约束下优化相位分布，能够有效抑制菲涅耳全息图的振铃伪像和散斑噪声。通过数值模拟和光学实验验证了该方法在无透镜全息投影中能够提供高质量的重建效果。
