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Image processing
Experimental investigation of ghost imaging of reflective objects with different surface roughness
Download:935次
Suqin Nan
Yanfeng Bai
*
Xiaohui Shi
Qian Shen
[ ... ]
Xiquan Fu
Author Affiliations
Abstract
College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China
We present an experimental demonstration of ghost imaging of reflective objects with different surface roughness. The influence of the surface roughness, the transverse size of the test detector, and the reflective angle on the signal-to-noise ratio (SNR) is analyzed by measuring the second-order correlation of the light field based on classical statistical optics. It is shown that the SNR decreases with an increment of the surface roughness and the detector’s transverse size or a decrease of the reflective angle. Additionally, the comparative studies between the rough object and the smooth one under the same conditions are also discussed.
Image processing
Coherence imaging
Statistical optics
Roughness
PDF全文
Full Text
Photonics Research
2017, 5(4): 04000372
Image processing
Progress of three-dimensional light-field display [Invited]
Download:1383次
Qungang Ma
1
Liangcai Cao
2
Zehao He
2,*
Shengdong Zhang
1
Author Affiliations
Abstract
1
School of Electronic and Computer Engineering, Peking University, Shenzhen 518055, China
2
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
In this review, the principle and the optical methods for light-field display are introduced. The light-field display is divided into three categories, including the layer-based method, projector-based method, and integral imaging method. The principle, characteristic, history, and advanced research results of each method are also reviewed. The advantages of light-field display are discussed by comparing it with other display technologies including binocular stereoscopic display, volumetric three-dimensional display, and holographic display.
100.6890
Three-dimensional image processing
120.2040
Displays
PDF全文
Full Text
Chinese Optics Letters
2019, 17(11): 111001
Image processing
Adaptive window iteration algorithm for enhancing 3D shape recovery from image focus
Download:866次
Long Li
1,2
Zhiyan Pan
1
Haoyang Cui
1
Jiaorong Liu
1
[ ... ]
Wenbin Wang
3,*
Author Affiliations
Abstract
1
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China
2
Shanghai Key Laboratory of Intelligent Manufacturing and Robotics, Shanghai University, Shanghai 200072, China
3
Mechanical and Electrical Engineering School, Shenzhen Polytechnic, Shenzhen 518055, China
Depth from focus (DFF) is a technique for estimating the depth and three-dimensional (3D) shape of an object from a multi-focus image sequence. At present, focus evaluation algorithms based on DFF technology will always cause inaccuracies in deep map recovery from image focus. There are two main reasons behind this issue. The first is that the window size of the focus evaluation operator has been fixed. Therefore, for some pixels, enough neighbor information cannot be covered in a fixed window and is easily disturbed by noise, which results in distortion of the model. For other pixels, the fixed window is too large, which increases the computational burden. The second is the level of difficulty to get the full focus pixels, even though the focus evaluation calculation in the actual calculation process has been completed. In order to overcome these problems, an adaptive window iteration algorithm is proposed to enhance image focus for accurate depth estimation. This algorithm will automatically adjust the window size based on gray differences in a window that aims to solve the fixed window problem. Besides that, it will also iterate evaluation values to enhance the focus evaluation of each pixel. Comparative analysis of the evaluation indicators and model quality has shown the effectiveness of the proposed adaptive window iteration algorithm.
100.6890
Three-dimensional image processing
100.3010
Image reconstruction techniques
100.2980
Image enhancement
PDF全文
Full Text
Chinese Optics Letters
2019, 17(6): 061001
Image processing
Three-dimensional image authentication using binarized images in double random phase integral imaging
Download:680次
Weitao Song
1,*
Qijia Cheng
1
Yue Liu
2,3
Yuanjin Zheng
1
[ ... ]
Yongtian Wang
2,3
Author Affiliations
Abstract
1
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
2
Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
3
AICFVE of Beijing Film Academy, Beijing 100088, China
We proposed a three-dimensional (3D) image authentication method using binarized phase images in double random phase integral imaging (InI). Two-dimensional (2D) element images obtained from InI are encoded using a double random phase encryption (DRPE) algorithm. Only part of the phase information is used in the proposed method rather than using all of the amplitude and phase information, which can make the final data sparse and beneficial to data compression, storage, and transmission. Experimental results verified the method and successfully proved the developed 3D authentication process using a nonlinear cross correlation method.
100.4998
Pattern recognition, optical security and encryption
110.6880
Three-dimensional image acquisition
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051002
Image processing
Boundary segmentation based on modified random walks for vascular Doppler optical coherence tomography images
Download:866次
Yong Huang
1,2
Chuanchao Wu
1,2
Shaoyan Xia
1,2
Lu Liu
3
[ ... ]
Yongtian Wang
1,2
Author Affiliations
Abstract
1
Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
2
Key Laboratory of Photoelectronic Imaging Technology and System (Beijing Institute of Technology), Ministry of Education, Beijing 100081, China
3
Department of Hand Surgery, Beijing Ji Shui Tan Hospital, Beijing 100035, China
Vascular Doppler optical coherence tomography (DOCT) images with weak boundaries are usually difficult for most algorithms to segment. We propose a modified random walk (MRW) algorithm with a novel regularization for the segmentation of DOCT vessel images. Based on MRW, we perform automatic boundary detection of the vascular wall from intensity images and boundary extraction of the blood flowing region from Doppler phase images. Dice, sensitivity, and specificity coefficients were adopted to verify the segmentation performance. The experimental study on DOCT images of the mouse femoral artery showed the effectiveness of our proposed method, yielding three-dimensional visualization and quantitative evaluation of the vessel.
100.3008
Image recognition, algorithms and filters
170.4500
Optical coherence tomography
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051001
Image processing
An improved long-term correlation tracking method with occlusion handling
Download:761次
Junhao Zhao
Gang Xiao
*
Xingchen Zhang
**
D. P. Bavirisetti
Author Affiliations
Abstract
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China
By improving the long-term correlation tracking (LCT) algorithm, an effective object tracking method, improved LCT (ILCT), is proposed to address the issue of occlusion. If the object is judged being occluded by the designed criterion, which is based on the characteristic of response value curve, an added re-detector will perform re-detection, and the tracker is ordered to stop. Besides, a filtering and adoption strategy of re-detection results is given to choose the most reliable one for the re-initialization of the tracker. Extensive experiments are carried out under the conditions of occlusion, and the results demonstrate that ILCT outperforms some state-of-the-art methods in terms of accuracy and robustness.
100.4999
Pattern recognition, target tracking
110.4155
Multiframe image processing
330.4150
Motion detection
PDF全文
Full Text
Chinese Optics Letters
2019, 17(3): 031001
Image Processing
Radiography of a K
α
X-ray source generated through ultrahigh picosecond laser–nanostructure target interaction
Download:1007次
剑 王
1,2
宗清 赵
2,*
卫华 何
2
斌 朱
2
[ ... ]
渝秋 谷
2
Author Affiliations
Abstract
1
Department of Physics, Fudan University, Shanghai 210433, China
2
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Laser-driven ultrafast X-ray sources are widely used for diagnostic radiography. However, there is a large divergence of fast electrons when they are generated by an intense short-pulse laser interacting with a foil target. We design a nanowire array target to achieve a more compact point X-ray source. Fast electrons are confined and guided by the nanowire array structure in order to generate a
K
α
source with a small spot size. In our work, the smallest measured source size is comparable to the laser spot size, while the conversion efficiency can reach
2.4
×
10
4
.
100.0100
Image processing
340.0340
X-ray optics
PDF全文
Full Text
Chinese Optics Letters
2015, 13(3): 031001
Image Processing
Transfer method to calibrate the normalized radiance for a CE318 Sun/sky radiometer
Download:1164次
Kaitao Li
1,2
Zhengqiang Li
1,*
Donghui Li
1
Wei Li
3
[ ... ]
Xingfeng Chen
1
Author Affiliations
Abstract
1
State Environmental Protection Key Laboratory of Satellite Remote Sensing, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Hefei University of Technology, Hefei 230009, China
4
University of Lille 1, Lille 59655, France
A transfer method is introduced to derive the normalized radiance for CE318 Sun/sky radiometer using viewing solid angles and extraterrestrial calibration constants. The new transfer method has a good consistency at different parts of the sky scanning. Error analysis suggests that the uncertainty of the transferred method is about 2.0%–2.4%. The normalized radiances are used as input of the aerosol inversion to test the performance of the new transfer method. The residuals of the inversion (e.g., difference between fitted and measured radiance) are chosen as the index of the radiance calibration accuracy. Analyses of one year’s measurements in Beijing suggest an average sky residual of 3.3% for almucantar scanning (while 3.7% for the AERONET method), which suggest a better accuracy of the transfer method when used in aerosol retrieval.
010.0280
Remote sensing and sensors
010.1310
Atmospheric scattering
010.3920
Meteorology
120.5630
Radiometry
PDF全文
Full Text
Chinese Optics Letters
2015, 13(4): 041001
Image Processing
Performance analysis of space-shift keying over negative-exponential and log-normal FSO channels
Download:1288次
Mohamed Abaza
1,*
Raed Mesleh
2
Ali Mansour
3
el-Hadi Aggoune
1
Author Affiliations
Abstract
1
Sensor Networks and Cellular Systems (SNCS) Research Center, University of Tabuk, 71491 Tabuk, Saudi Arabia
2
Electrical Engineering Department, University of Tabuk, P.O. Box 741, 71491 Tabuk, Saudi Arabia
3
Lab STICC, ENSTA Bretagne, 2 Rue François Verny, 29806 Brest Cedex 9, France
The average bit-error rate (ABER) performance of free-space optical (FSO) communication links is investigated for space-shift keying (SSK) over log-normal and negative-exponential atmospheric turbulence channels. SSK is compared with repetition codes and a single-input single-output system using multiple pulse amplitude modulations. Simulation results show that the signal-to-noise ratio gain of SSK largely increases with greater spectral efficiencies and/or higher turbulence effects. A tight bound for ABER is derived based on an exact moment generation function (MGF) for negative-exponential channel and an approximate MGF for log-normal channel. Finally, extensive Monte Carlo simulations are run to validate the analytical analysis.
010.1300
Atmospheric propagation
010.1330
Atmospheric turbulence
060.4510
Optical communications
PDF全文
Full Text
Chinese Optics Letters
2015, 13(5): 051001
Image Processing
Adaptive multi-sample-based photoacoustic tomography with imaging quality optimization
Download:915次
Yuxin Wang
1
Jie Yuan
1,*
Sidan Du
1
Xiaojun Liu
2
[ ... ]
Xueding Wang
3,**
Author Affiliations
Abstract
1
School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
2
School of Physics, Nanjing University, Nanjing 210093, China
3
Department of Radiology, University of Michigan, Ann Arbor, MI 48109, USA
The energy of light exposed on human skin is compulsively limited for safety reasons which affects the power of photoacoustic (PA) signal and its signal-to-noise ratio (SNR) level. Thus, the final reconstructed PA image quality is degraded. This Letter proposes an adaptive multi-sample-based approach to enhance the SNR of PA signals and in addition, detailed information in rebuilt PA images that used to be buried in the noise can be distinguished. Both
ex vivo
and
in vivo
experiments are conducted to validate the effectiveness of our proposed method which provides its potential value in clinical trials.
100.2980
Image enhancement
170.1065
Acousto-optics
170.5120
Photoacoustic imaging
PDF全文
Full Text
Chinese Optics Letters
2015, 13(6): 061001
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