Nakatsuji Tatsuya, Matsushima Kyoji
Department of Electrical and Electronic Engineering, Kansai University, Suita, Osaka, Japan.
Appl Opt. 2008 Jul 1;47(19):D136-43. doi: 10.1364/ao.47.00d136.
Free-viewpoint images obtained from phase-shifting synthetic aperture digital holography are given for scenes that include multiple objects and a concave object. The synthetic aperture technique is used to enlarge the effective sensor size and to make it possible to widen the range of changing perspective in the numerical reconstruction. The lensless Fourier setup and its aliasing-free zone are used to avoid aliasing errors arising at the sensor edge and to overcome a common problem in digital holography, namely, a narrow field of view. A change of viewpoint is realized by a double numerical propagation and by clipping the wave field by a given pupil. The computational complexity for calculating an image in the given perspective from the base complex-valued image is estimated at a double fast Fourier transform. The experimental results illustrate the natural change of appearance in cases of both multiple objects and a concave object.
给出了从相移合成孔径数字全息术中获得的自由视角图像，这些图像用于包含多个物体和一个凹面物体的场景。合成孔径技术用于扩大有效传感器尺寸，并使得在数值重建中扩大视角变化范围成为可能。无透镜傅里叶设置及其无混叠区域用于避免在传感器边缘出现混叠误差，并克服数字全息术中的一个常见问题，即视场狭窄。通过双重数值传播并通过给定光瞳裁剪波场来实现视角的改变。从基本复值图像计算给定视角下的图像的计算复杂度估计为两次快速傅里叶变换。实验结果说明了在多个物体和凹面物体两种情况下外观的自然变化。
