Shading of holographic reconstructed image by two-dimensional amplitude modulation of zone plates
Shading of holographic reconstructed image by two-dimensional amplitude modulation of zone plates
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波带片二维振幅调制全息重建图像的着色
DOI：
10.1117/12.907621
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Kurihara and Y. Takaki
中科院分区：
文献类型：
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作者：
稲川雄太;依田秀彦;白石和男;T. Kurihara and Y. Takaki
提出了一种对电子全息重建图像进行阴影处理的技术。我们的技术改进了带片技术，将三维物体表示为物体点的集合，并将产生物体点的带片求和以计算全息图。我们的技术基于为计算机图形学开发的Phong反射模型，该模型假设从物体反射的光由三个组成部分组成：漫反射，镜面反射和环境反射光。在这些组件中，只有镜面组件依赖于相机（或眼睛）的位置。全息重建图像随着观察方向的变化而变化。因此，在不同的观察方向上，镜面分量会发生变化。由于光经过带形板调制后会聚到一个物体点，我们假设光在带形板上的每个点的重定向方式不同。因此，对带片进行二维调幅会产生一个向不同方向发射不同强度光的物点。所提出的二维调幅包括可变调制和恒定调制：前者控制镜面分量，后者控制漫反射和环境分量。我们通过实验验证了所提出的技术。
We propose a technique to shade reconstructed images of electronic holography. Our technique modifies the zone plate technique, which represents a three-dimensional object as an aggregate of object points and zone plates, which generate object points, are summed to calculate a hologram. Our technique is based on the Phong reflection model developed for computer graphics, which assumes that light reflected from an object consists of three components: diffuse, specular, and ambient reflection light. Among these components, only the specular component depends on the position of the camera (or the eye). A holographic reconstructed image changes depending on the viewing direction. Therefore, the specular component changes for different viewing directions. Because light modulated by a zone plate converges to an object point, we assumed that light is redirected differently at each point on the zone plate. Therefore, two-dimensional amplitude modulation of the zone plate would generate an object point that emits light with different intensities in different directions. The proposed two-dimensional amplitude modulation comprises variable and constant modulations: the former one controls the specular component and the latter one controls the diffuse and ambient components. We experimentally verified the proposed technique.