用于全息显示的三维场景获取与编码方法研究
文献类型：学位论文
| 作者 | 岳伟瑞 |
| 学位类别 | 硕士 |
| 答辩日期 | 2015 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 司徒国海 |
| 关键词 | 全息显示，全息图，强度传输方程，迭代算法 |
| 其他题名 | Three-dimensional information acquisition and encoding methods for holographic display |
| 中文摘要 | 随着显示技术的发展，传统的二维显示已经难以满足人们对图像显示的要求，三维立体显示技术已成为显示技术领域的一个研究热点。全息显示作为一种裸眼真三维显示技术，不仅能够提供连续的接近于真实世界的三维图像，而且不存在显示机理与人眼视觉生理之间的矛盾，使用户能够在连续视点获得良好的三维视觉体验，被公认为是最理想的三维显示。 目前，全息显示技术的研究主要集中在全息编码和高分辨全息图载体(即空间光调制器和记录材料)的研制等方面，而在全息显示内容获取方面的研究涉及甚少。本文针对全息显示的三维场景信息获取和计算全息图编码展开研究，所取得的主要成果如下： 1、基于强度传输方程（TIE）变换，提出了一种在近距离成像条件下，利用自然光照明来获取三维场景信息的方法。该方法利用一副彩色图像不同通道之间光强差别来得到三维信息。和现有方法相比，该方法不仅避免了利用传统光学全息获取三维场景信息时采用相干性激光而引入的散斑，而且由于不需要使用微透镜阵列，因而不会像基于集成成像的三维场景信息获取方法一样，降低再现图像的分辨率。 2、结合振幅调制原理，提出了一种TIE和改进迭代角谱传播算法相混合的三维场景信息获取方法。该方法将TIE求解的相位作为改进迭代角谱传播算法的初始相位，以此来加快迭代求解速度。模拟实验表明，该方法提高了获取的三维场景信息的精度。 3、在全息图编码方面，直接提取物光波相位编码容易造成再现像失真，迭代傅里叶变换编码虽然再现像不会失真，但编码速度较慢且图像精度仍有提高空间。基于此，提出了一种混合了梯度下降和振幅调制的迭代傅里叶变换编码方法。仿真实验和全息显示实验表明，该方法能加快全息图编码速度，并获得更好的全息显示图像。 |
| 英文摘要 | Three-dimensional (3D) display is one of the most important topics in the field of display technology. As an autostereoscopic display, holographic display not only provides real 3D scenes nearly close to the real-world scenes with continuous viewpoints and all depth cues, but also avoids the accommodation-convergence conflict, which causes confusion and fatigue of the human visual system. Therefore, it is widely believed that holographic display is the most ideal method for 3D display. Currently, the community of holographic display mainly focuses on holographic coding, and the development of high-resolution hologram carriers such as spatial light modulators and holographic materials. Far less attention has been paid to the acquisition of holographic content, especially the natural 3D scene. In this thesis, we focus on the acquisition 3D scene for holographic display. . The main results are as follows: 1、We propose a technique a technique based on a variation of the transport of intensity equation (TIE) to acquire 3D scene information under natural light illumination. The scene captured using our method is speckle- free, in comparison with digital holography, and high-resolution comparing with integral imaging. . 2、Based on magnitude modification，we propose a method by combining the TIE and the iterative angular spectrum propagation algorithm (IASPA), which allows the acquisition of 3D scene more accurately. 3、In the aspect of hologram encoding, direct extraction of the phase from object beam usually yields distortion in the reconstructed image. Although encoding methods such as the iterative Fourier-transform algorithm (IFTA) does not introduce image distortion, they are usually time-consuming. . In order to solve this problem , we propose an iterative algorithm by introducing the strategy of gradient decent and magnitude modification into the IFTA. Both simulation and optical experiment results demonstrate that the proposed method is much faster than the original IFTA, and allows better holographic reconstruction of the captured scene. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16883]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 岳伟瑞. 用于全息显示的三维场景获取与编码方法研究[D]. 中国科学院上海光学精密机械研究所. 2015. |
入库方式： OAI收割
来源：上海光学精密机械研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。