Author Affiliations
Abstract
1 Yunnan Provincial Key Laboratory of Modern Information Optics, Kunming University of Science and Technology, Kunming 650500, China
2 The Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
Bragg processing using a volume hologram offers an alternative in optical image processing in contrast to Fourier-plane processing. By placing a volume hologram near the object in an optical imaging setup, we achieve Bragg processing. In this review, we discuss various image processing methods achievable with acousto-optic modulators as dynamic and programmable volume holograms. In particular, we concentrate on the discussion of various differentiation operations leading to edge extraction capabilities.
optical image processing edge extraction acousto-optics volume gratings Chinese Optics Letters
2022, 20(2): 021101
Author Affiliations
Abstract
1 Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA
2 Lab of Information Optics and Optoelectronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Anisotropic edge enhancement is simulated using a spiral phase plate (SPP) in optical scanning holography (OSH). We propose to use a delta function and an SPP as the pupil functions to realize anisotropic edge enhancement. The interference of these two pupils is used to two-dimensionally scan an object to record its edge-only information. This is done in three ways: first, by shifting the SPP, second, by using two offset SPPs of same charge, and finally, by using two oppositely charged SPPs. Our computer simulations show the capability of selectively enhancing the edges of a given object.
100.2980 Image enhancement 090.1995 Digital holography 070.6110 Spatial filtering Chinese Optics Letters
2016, 14(1): 010006
Author Affiliations
Abstract
1 Lead Editor, Applied Optics, Virginia Tech, USA
2 Lead Editor, COL, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China
3 University of Dayton, USA
4 Korea Electronics Technology Institute (KETI), South Korea
5 Université du Maine, France
This feature issue is the second Joint Applied Optics (AO) and Chinese Optics Letters (COL) Feature Issue on digital holography and three-dimensional (3D) imaging. The first installment of such a joint feature issue was in 2011. In the present feature issue, there are a total of 24 papers in AO and 9 papers in COL.
Chinese Optics Letters
2016, 14(1): 010001
Author Affiliations
Abstract
1 Department of Electrical and Electronic Engineering, University of Hong Kong, Pokfulam, Hong Kong, China
2 Institute of Applied Physics, University of Electronic Science and Technology of China, 610054, Chengdu, China
3 Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
The optical scanning holography (OSH) technique can capture all the three-dimensional volume information of an object in a hologram via a single raster scan. The digital hologram can then be processed to reconstruct individual sectional images of the object. In this paper, we present a scheme to reconstruct sectional images in OSH with enhanced depth resolution, where a spatial light modulator (SLM) is adopted as a configurable point pupil. By switching the SLM between two states, different Fresnel zone plates (FZPs) are generated based on the same optical system. With extra information provided by different FZPs, a depth resolution at 0.7 μm can be achieved.
Digital holography Inverse problems Image reconstructionrestoration Computational imaging Photonics Research
2014, 2(2): 02000064
1 徐州师范学院物理系，徐州 221009
2 Optical Image Processing Laboratory,The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University,Blacksburg,Virinia 24061-0111,USA
利用含有布拉格声光元件的单透镜象处理系统实现了图像噪声的减弱，并给出了实验结果。
噪声减弱 布拉格声光元件 角谱 空间角谱滤波
