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检索条件"任意字段=Conference on Optoelectronic Imaging and Multimedia Technology IV"

共 163 条记录，以下是11-20 订阅

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Underwater Range-Gated Laser imaging Enhancement based on Contrast Limited Adaptive Histogram Equalization 4

Underwater Range-Gated Laser Imaging Enhancement based on Co...

引用

conference on optoelectronic imaging and multimedia technology iv

作者： Sun Liang Wang Xinwei Liu Xiaoquan Ren Pengdao Lei Pingshun You Ruirong He Jun Zhou Yan Liu Yuliang Chinese Acad Sci Inst Semicond Optoelect Syst Lab Beijing 100083 Peoples R China Univ Chinese Acad Sci Coll Mat Sci & Optoelect Technol Beijing 100049 Peoples R China

ISBN: (纸本)9781510604599;9781510604605

Underwater range-gated laser imaging (URGLI) still has some problems like un-uniform light, low brightness and contrast. To solve the problems, a variant of adaptive histogram equalization called contrast limited adaptive histogram equalization (CLAHE) is proposed in this paper. In experiment, using the CLAHE and HE to enhance the images, and evaluate the quality of enhanced images by peak signal to noise ratio (PSNR) and contrast. The result shows that the HE gets the images over-enhanced, while the CLAHE has a good enhancement with compressing the over-enhancement and the influence of un-uniform light. The experimental results demonstrate that the CLAHE has a good result of image enhancement for target detection by underwater range-gated laser imaging system.

关键词： Underwater range-gated Histogram Equalization laser imaging

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Underwater three dimensional range-gated laser imaging based on triangular-range-intensity profile spatial-correlation method 4

Underwater three dimensional range-gated laser imaging based...

引用

conference on optoelectronic imaging and multimedia technology iv

作者： Wang Xinwei Liu Xiaoquan Ren Pengdao Sun Liang Fan Songtao Lei Pingshun Zhou Yan Chinese Acad Sci Inst Semiconductors Optoelect Syst Lab Beijing 100083 Peoples R China

ISBN: (纸本)9781510604599;9781510604605

Underwater 3D range-gated imaging can extend the detection range over underwater stereo cameras, and also has great potentials in real-time high-resolution imaging than 3D laser scanning. In this paper, a triangular-range-intensity profile spatial correlation method is used for underwater 3D range-gated imaging. Different from the traditional trapezoidal method, in our method gate images have triangular range-intensity profiles. Furthermore, inter-frame correlation is used for video-rate 3D imaging. In addition, multi-pulse time delay integration is introduced to shape range-intensify profiles and realize flexible 3D SRGI. Finally, in experiments, 3D images of fish net, seaweed and balls are obtained with mm-scaled spatial and range resolution.

关键词： three-dimensional range-gated imaging range-intensity correlation triangular range-intensity profile underwater imaging

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High resolution three-dimensional imaging with compress sensing 4

High resolution three-dimensional imaging with compress sens...

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conference on optoelectronic imaging and multimedia technology iv

作者： Wang, Jingyi Ke, Jun Beijing Inst Technol Beijing Peoples R China

ISBN: (纸本)9781510604599;9781510604605

LIDAR require extremely fast data acquisition speed. This makes the manufacture of detector array for LIDAR system is very difficult. To solve this problem, we consider using compress sensing which can greatly decrease the data acquisition and relax the requirement of a detection device. To use the compressive sensing idea, a spatial light modulator will be used to modulate the pulsed light source. Then a photodetector is used to receive the reflected light. A convex optimization problem is solved to reconstruct the 2D depth map of the object. To improve the resolution in transversal direction, we use multiframe image restoration technology. For each 2D piecewise-planar scene, we move the SLM half-pixel each time. Then the position where the modulated light illuminates will changed accordingly. We repeat moving the SLM to four different directions. Then we can get four low-resolution depth maps with different details of the same plane scene. If we use all of the measurements obtained by the subpixel movements, we can reconstruct a high-resolution depth map of the sense. A linear minimum-mean-square error algorithm is used for the reconstruction. By combining compress sensing and multiframe image restoration technology, we reduce the burden on data analyze and improve the efficiency of detection. More importantly, we obtain high-resolution depth maps of a 3D scene.

关键词： LIDAR compress sensing subpixel movements high-resolution imaging

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Iterative deconvolution methods for ghost imaging 4

Iterative deconvolution methods for ghost imaging

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conference on optoelectronic imaging and multimedia technology iv

作者： Wang, Wei Situ, Guohai Chinese Acad Sci Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)9781510604599;9781510604605

Ghost imaging (GI) is an important technique in single-pixel imaging. It has been demonstrated that GI has applications in various areas such as imaging through harsh environments and optical encryption. Correlation is widely used to reconstruct the object image in GI. But it only offers the signal-to-noise ratios(SNR) of the reconstructed image linearly proportional to the number of measurements. Here, we develop a kind of iterative deconvolution methods for GI. With the known image transmission matrix in GI, the first one uses an iterative algorithm to decrease the error between the reconstructed image and the ground-truth image. Ideally, the error converges to a minimum for speckle patterns when the number of measurements is larger than the number of resolution cells. The second technique, Gerchberg-Saxton (GS) like GI, takes the advantage of the integral property of the Fourier transform, and treats the captured data as constraints for image reconstruction. According to this property, we can regard the data recorded by the bucket detector as the Fourier transform of the object image evaluated at the origin. Each of the speckle patterns randomly selects certain spectral components of the object and shift them to the origin in the Fourier space. One can use these constraints to reconstruct the image with the GS algorithm. This deconvolution method is suitable for any single pixel imaging models. Compared to conventional GI, both techniques offer a nonlinear growth of the SNR value with respect to the number of measurements.

关键词： Ghost imaging image processing signal to noise ratio

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Large field-of-view range-gated laser imaging based on image fusion 4

Large field-of-view range-gated laser imaging based on image...

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conference on optoelectronic imaging and multimedia technology iv

作者： Ren Pengdao Wang Xinwei Sun Liang You Ruirong Lei Pingshun Zhou Yang Univ Chinese Acad Sci Beijing 100049 Peoples R China Chinese Acad Sci Inst Semicond Optoelect Syst Lab Beijing 100083 Peoples R China

ISBN: (纸本)9781510604599;9781510604605

Laser range-gated imaging has great potentials in remote night surveillance with far detection distance and high resolution, even if under bad weather conditions such as fog, snow and rain. However, the field of view (FOV) is smaller than large objects like buildings, towers and mountains, thus only parts of targets are observed in one single frame, so that it is difficult for targets identification. Apparently, large FOV is beneficial to solve the problem, but the detection range is not available due to low illumination density in a large field of illumination matching with the FOV. Therefore, a large field-of-view range-gated laser imaging is proposed based on image fusion in this paper. Especially an image fusion algorithm has been developed for low contrast images. First of all, an infrared laser range-gated system is established to acquire gate images with small FOV for three different scenarios at night. Then the proposed image fusion algorithm is used for generating panoramas for the three groups of images respectively. Compared with raw images directly obtained by the imaging system, the fused images have a larger FOV with more detail target information. The experimental results demonstrate that the proposed image fusion algorithm is effective to expand the FOV of range-gated imaging.

关键词： image fusion laser imaging range gated night vision image stitching

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Human body region enhancement method based on Kinect infrared imaging 4

Human body region enhancement method based on Kinect infrare...

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conference on optoelectronic imaging and multimedia technology iv

作者： Yang, Lei Fan, Yubo Son, Xiaowei Cai, Wenjing Zhongyuan Univ Technol Sch Elect & Informat Engn Zhengzhou 450007 Peoples R China Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian 710049 Peoples R China

ISBN: (纸本)9781510604599;9781510604605

To effectively improve the low contrast of human body region in the infrared images, a combing method of several enhancement methods is utilized to enhance the human body region. Firstly, for the infrared images acquired by Kinect, in order to improve the overall contrast of the infrared images, an Optimal Contrast-Tone Mapping (OCTM) method with multi-iterations is applied to balance the contrast of low-luminosity infrared images. Secondly, to enhance the human body region better, a Level Set algorithm is employed to improve the contour edges of human body region. Finally, to further improve the human body region in infrared images, Laplacian Pyramid decomposition is adopted to enhance the contour-improved human body region. Meanwhile, the background area without human body region is processed by bilateral filtering to improve the overall effect. With theoretical analysis and experimental verification, the results show that the proposed method could effectively enhance the human body region of such infrared images.

关键词： image processing infrared image human body region enhancement OCTM Level Set algorithm Laplacian Pyramid decomposition

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Potential Fingerprints Detection Using UV Spectral imaging

Potential Fingerprints Detection Using UV Spectral Imaging

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conference on optoelectronic imaging and multimedia technology II

作者： Huang Wei Yang Zhichao Xu Xiaojing Guo Jingjing Minist Publ Secur Inst Forens Sci Beijing 100038 Peoples R China Minist Publ Secur Zhejiang Police Coll Beijing 100038 Peoples R China

ISBN: (纸本)9780819493132

Spectral imaging technology research is becoming more extensive in the field of examination of material evidence. UV spectral imaging technology is an important part of the full spectrum of imaging technology. This paper summarizes the application of the results of UV imaging technology in the field of evidence examination, explores the common object of potential fingerprints of UV spectra characteristic for the research objectives, which shows the potential traces of criminal using the ultraviolet spectrum imaging method.

关键词： UV spectral imaging potential fingerprints forensic science

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Reconstructing spectral reflectance from digital camera through samples selection 4

Reconstructing spectral reflectance from digital camera thro...

引用

conference on optoelectronic imaging and multimedia technology iv

作者： Cao, Bin Liao, Ningfang Yang, Wenming Chen, Haobo Beijing Inst Technol Sch Optoelect Minist Educ China Key Lab Photoelect Imaging Technol & Syst Beijing 100081 Peoples R China Shenzhen Res Inst Beijing Inst Technol Shenzhen 518057 Guangdong Peoples R China

ISBN: (纸本)9781510604599;9781510604605

Spectral reflectance provides the most fundamental information of objects and is recognized as the "fingerprint" of them, since reflectance is independent of illumination and viewing conditions. However, reconstructing high-dimensional spectral reflectance from relatively low-dimensional camera outputs is an ill-posed problem and most of methods requaired camera's spectral responsivity. We propose a method to reconstruct spectral reflectance from digital camera outputs without priori knowledge of camera's spectral responsivity. This method respectively averages reflectances of selected subset from main training samples by prescribing a limit to tolerable color difference between the training samples and the camera outputs. Different tolerable color differences of training samples were investigated with Munsell chips under D65 light source. Experimental results show that the proposed method outperforms classic PI method in terms of multiple evaluation criteria between the actual and the reconstructed reflectances. Besides, the reconstructed spectral reflectances are between 0-1, which make them have actual physical meanings and better than traditional methods.

关键词： reflectance reconstruction tolerable color difference selection camera outputs

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Interference efficiency of Thermal Infrared imaging Fourier Transform Spectrometer

Interference efficiency of Thermal Infrared Imaging Fourier ...

引用

conference on optoelectronic imaging and multimedia technology

作者： Xiao, Xiangguo Gao, Jiaobo Jiao, Mingyin Si, Jinhai Xi An Jiao Tong Univ Xian 710049 Peoples R China Xian Inst Appl Opt Xian 710065 Peoples R China

ISBN: (纸本)9780819483805

Theory about the Thermal Infrared imaging Fourier Transform Spectrometer has been discussed, and then we found the Interference efficiency is an important factor related to SNR of Thermal Infrared imaging Fourier Transform. The Interference efficiency involved in transverse shear splitting. After study of this kind of beam splitting, some formulas about Thermal Infrared imaging Fourier Transform Spectrometer has been found, then the simulation modes were done. At the end, Interference efficiency of imaging Fourier Transform Spectrometer was calculated. The relationship between interference efficiency and SNR was simply given.

关键词： Thermal Infrared Interference Spectrum imaging spectrometer Interference efficiency

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Research on signal processing techniques for a chirped amplitude modulation imaging laser radar

Research on signal processing techniques for a chirped ampli...

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conference on optoelectronic imaging and multimedia technology

作者： Wang, Yang Wang, Qianqian Wang, Haiwei Beijing Inst Technol Sch Optoelect Beijing 100081 Peoples R China

ISBN: (纸本)9780819483805

Due to some significant advantages such as high space resolution, three-dimensional imagery (including intensity image and range image) acquiring, and so on, an imaging laser radar is helpful to improve the correct recognition ratio being as a sensor in a target recognition system. A chirped amplitude modulation imaging ladar is based on the frequency modulation/continuous wave (FM/cw) technique. The target range is calculated by measuring the frequency difference between projected and returned laser signal. The design of a signal processing system for a FM/cw imaging ladar is introduced in this paper, which includes an acquiring block, a memory block, a communication block, and a FFT processor. The performance of this system is analyzed in detail in this paper.

关键词： laser technology laser radar imaging ladar FMCW DSPs

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