检索结果-内蒙古大学图书馆

Preprocessing method for underwater time-gated SPAD-array-based images utilizing Retinex and BM3D

Applied Optics 2025年第14期64卷 3842-3855页

作者： Wu, Guan-Lin Yu, Xiang-Zhi Zhu, Shi-Hao Tian, You-Yuan Kuang, Yan-Jin Zhao, Huan-Qing Qiu, Su Jin, Wei-Qi Wang, Xia MoE Key Lab of Photoelectronic Imaging Technology and System Beijing Institute of Technology Beijing100081 China

Underwater optical imaging is affected by light absorption and backscattering in water, thus yielding low signal-to-noise ratios and limited imaging ranges. This study proposes an image preprocessing method for underwater, time-gated, single-photon avalanche diode (TG-SPAD)-array-based images according to the Retinex theory, and a block-matching and 3D filtering (BM3D) algorithm to address uneven illumination and complex noise issues in small-diameter, light beam, underwater imaging. Specifically, images undergo rapid illumination correction in combination with time-domain transformation. Subsequently, the proposed method employs the BM3D algorithm in conjunction with an adaptive noise-fitted model and an improved Anscombe transform for denoising. The experimental results demonstrate that the proposed method outperforms various existing image preprocessing techniques in both subjective visual assessments and objective evaluation metrics. The proposed method considerably enhances the visual quality of TG-SPAD-array-based images and is well-suited for underwater, single-photon imaging applications and for the optimized processing of high-precision, 3D depth maps. © 2025 Optica Publishing Group.

关键词： Image enhancement

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Design of off-axis reflective holographic optical elements in a holographic near-eye display system

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Optics Letters 2025年第9期50卷 3022-3025页

作者： Zhang, Shijie Tian, Yifan Liu, Juan Beijing Engineering Research Center for Mixed Reality and Advanced Display MoE Key Lab of Photoelectronic Imaging Technology and System School of Optics and Photonics Beijing Institute of Technology Beijing100081 China

Holographic optical elements (HOEs) span a wide application, such as virtual reality and augmented reality displays. However, due to the complex aperiodic structures in lens-type HOEs, the phase design faces difficulties in aberration optimization. Here, we present a method for the design of the off-axis reflective lens-type HOE. Considering the varying degrees of aberrations introduced by the varying object distances across different regions of the object plane, a straightforward yet effective local aberration compensation method is carried out through superimposing different mutually perpendicular cylindrical lens phases at different positions of the HOE. The optimized phase distribution of the HOE can be directly obtained for fabrication like holographic printing. The numerical results show that the field curvature (FC) and the interval of the imaging distance between the meridional plane and the sagittal plane are significantly reduced to 1% of their initial values, and the astigmatism is alleviated. The optical experiments are conducted using two spatial light modulators (SLMs), and the experimental results are in good agreement with the optimized ones. It is expected that the proposed method could be further applied for the development of holographic near-eye display (NED) devices. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Augmented reality

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Calibration of infrared division-of-time polarization imaging system for non-ideal infrared polarized radiation source 4

Calibration of infrared division-of-time polarization imagin...

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4th International Conference on Laser, Optics, and Optoelectronic technology, LOPET 2024

作者： Cui, Hao Yang, Jianguo Li, Li Jin, Weiqi MoE Key Lab of Photoelectronic Imaging Technology and System Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510681903

Infrared division-of-time (DoT) polarization imaging is a common polarization imaging mode, and it is usually necessary to use an infrared polarized radiation source composed of a blackbody and a polarizer to provide polarized radiation incidence and realize system calibration. The traditional visible-light polarized radiation source only needs to consider the energy attenuation caused by the transmittance of polarizer, that is, the emitted radiation is completely polarized radiation. However, in the thermal infrared band, it is necessary to consider the nonpolarized spontaneous radiation and polarized reflected radiation of the polarizer, which will bias the ideal polarized radiation estimation and affect the calibration accuracy of the infrared DoT polarization imaging system. In this paper, the influence of non-ideal infrared polarized radiation source composed of blackbody and polarizer on the calibration of infrared DoT polarization imaging system is studied, and a calibration model of infrared DoT polarization imaging system is proposed. The experimental results show that the modified model can improve the calibration accuracy of key parameters of the system, restrain the over-calibration, and obtain stable polarization imaging effect. © 2024 SPIE.

关键词： Light polarization

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SPL-VINS: superpoint line vins mono

SPL-VINS: superpoint line vins mono

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2024 International Conference on Advanced Image Processing technology, AIPT 2024

作者： Tian, Xiaoyu Cao, Hongyu Li, Li MoE Key Lab of Photoelectronic Imaging Technology and System Beijing Institute of Technology Beijing Beijing100081 China

ISBN: (纸本)9781510682542

Deep learning, with its data-driven advantages, achieves robustness beyond that of traditional algorithms. The integration of deep learning with visual-inertial odometry (VIO) has been a prominent research topic. However, a mature integration solution has yet to emerge. In this paper, we propose SPL-VINS, which combines the deep learning-based feature point detection algorithm SuperPoint with the Vins Mono. Additionally, we add line features into Vins Mono and propose a non-maximum suppression(NMS) method for line features. The residual of line features is modeled in the form of point-to-line distance. Experimental results on the public dataset Euroc demonstrate a significant reduction in absolute translation error and rotation error compared to Vins Mono. © 2024 SPIE.

关键词： Deep learning

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Quality assessment for visible and infrared color fusion images of typical scenes

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Chinese Optics Letters 2012年第8期10卷 18-22页

作者：高绍姝金伟其王岭雪 MoE Key Laboratory of Photoelectronic Imaging Technology and System School of OptoelectronicsBeijing Institute of Technology

Two comprehensive evaluation metrics, image perceptual quality based on target detectability （PQTD） and perceptual quality based on scene understanding （PQSU）, are proposed to measure image quality for visible and infrared color fusion images of typical scenes. A psychophysical experiment is performed to explore the relationship between conventional quality attributes and the proposed evaluation metrics. The prediction models for PQTD and PQSU are derived by multiple linear regression statistical analyses. Results show that the variation of PQTD can be predicted by sharpness and perceptual contrast between the target and background, and that color harmony and sharpness can predict PQSU. The proposed evaluation metrics and their prediction models provide a foundation for further developing objective quality evaluation of color fusion images.

关键词： Color Linear regression Mathematical models

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Optical micro-scanning location calibration of thermal microscope imaging system

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Journal of Beijing Institute of technology 2013年第2期22卷 250-255页

作者：关丛荣高美静金伟其王吉晖 MoE Key Laboratory of Photoelectronic Imaging Technology and System School of Optoelectronics Beijing Institute of Technology College of Mechanical and Electrical Engineering North China University of Technology Department of Information Science and Engineering Yanshan University

A method of micro-scanning location adaptive calibration was proposed, which was real- ized by the digital image micro-displacement estimation. With geometric calculation, this calibration method used the displacement estimation of two thermal microscope images to get the size and direc- tion of each scanning location calibration angle. And each location calibration process was repeated according to the offset given by the system beforehand. The comparison experiments of sequence oversampling reconstruction before and after the micro-scanning location calibration were done. The results showed that the calibration method effectively improved the thermal microscope imaging qual- ity.

关键词： thermal microscope imaging micro-scanning location calibration oversampling recon- struction

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A novel infrared object detection method based on the generalized cumulative sum in IRST system

A novel infrared object detection method based on the genera...

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International Conference on Optical Instruments and technology (OIT) - Optoelectronic imaging and Processing technology

作者： Tian, Yuexin Gao, Kun Liu, Ying Bin, Qi Xu, Zhigao Key Lab. of Photoelectronic Imaging Technology and System (China) Science and Technology on Low-Light-Level Night Vision Lab. (China)

ISBN: (纸本)9780819499639

Aiming at the infrared object detection applications, a novel generalized cumulative sum processing is presented. Since in a typical IRST application system, object appearing and vanishing can be regarded as the change-point detection problem in Statistics. One of the effective solutions is the generalized cumulative sum processing (GCUSUM). Analyses are focused on the detection threshold value selection of GCUSUM algorithm and relations among the threshold value and false alarm rate, detection probability and signal-noise rate. The further researches extend a uniform band IRST system into the multiple band IRST system and improve the realization of GCUSUM algorithm. Results of theoretical analysis and simulation show that our modified algorithm has excellent object detection performance in an infrared image sequences from a real IRST system.

关键词： generalized cumulative sum Multi-band IRST mean detection delay infrared image processing

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Infrared and visible image fusion with the target marked based on multi-resolution visual attention mechanisms

Infrared and visible image fusion with the target marked bas...

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Chinese Society for Optical Engineering Conferences, CSOE 2016

作者： Huang, Yadong Gao, Kun Gong, Chen Han, Lu Guo, Yue Key Lab of Photoelectronic Imaging Technology and System Ministry of Education of China Beijing Institute of Technology Beijing China

ISBN: (纸本)9781510610118

During traditional multi-resolution infrared and visible image fusion processing, the low contrast ratio target may be weakened and become inconspicuous because of the opposite DN values in the source images. So a novel target pseudocolor enhanced image fusion algorithm based on the modified attention model and fast discrete curvelet transformation is proposed. The interesting target regions are extracted from source images by introducing the motion features gained from the modified attention model, and source images are performed the gray fusion via the rules based on physical characteristics of sensors in curvelet domain. The final fusion image is obtained by mapping extracted targets into the gray result with the proper pseudo-color instead. The experiments show that the algorithm can highlight dim targets effectively and improve SNR of fusion image. © 2017 SPIE.

关键词： Image fusion

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Blind image restoration and segmentation via decoupled adaptive Mumford Shah model

Blind image restoration and segmentation via decoupled adapt...

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Chinese Society for Optical Engineering Conferences, CSOE 2016

作者： Jiang, Zhangqin Mi, Fengwen Dou, Zeyang Key Lab of Photoelectronic Imaging Technology and System Ministry of Education of China Beijing Institute of Technology Beijing China

ISBN: (纸本)9781510610118

A new model that can simultaneously do blind restoration and segmentation task is proposed in the paper. The new model belongs to the variant of Mumford Shah model. In order to promote the computational efficiency, the restoration part and segmentation part are decoupled from the original model. The blind image restoration part is based on the variable exponent regularizer to accurately estimate both piecewise constant point spread functions and smooth point spread functions. The segmentation part is the explicit edge indicator function obtained from the original model. The new model can be efficiently solved using split bregman framework. Numerical experiments show that the new algorithm produces promising results and robust to noise. © 2017 SPIE.

关键词： Optical transfer function

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Reconstructing temperature field images by MWIR and LWIR based on uncooled IRFPA

Reconstructing temperature field images by MWIR and LWIR bas...

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2021 International Conference on Laser, Optics and Optoelectronic technology, LOPET 2021

作者： Li, Jiahong Liu, Zhihao Sha, Mozhou Jin, Weiqi Guo, Hong Li, Li Guo, Qin MoE Key Lab of Photoelectronic Imaging Technology and System Beijing Institute of Technology Beijing Beijing100081 China Beijng Electro-Mechanical Engineering Institute Beijing Beijing100074 China

ISBN: (数字)9781510646179

ISBN: (纸本)9781510646162

With the development of high-performance IRFPA, temperature field image measurement has been applied to the fields of industry and agriculture, national defence, health and epidemic prevention. In order to obtain a clearer and more accurate image of temperature field, we developed a coaxial beam splitting medium wave/long wave dual-band infrared temperature field image reconstruction experimental system using uncooled wide-band IRFPA. Then, a low frequency noise correction method in gradient domain is used to reduce the temperature measurement error caused by the non-uniformity of detectors. The temperature measurement error of central field of view is less than 3.5% and that of quadrangular field of view is less than 4.5% in the temperature range of 20~80oC by calibrating the temperature of the system using blackbody. Experimental results show that the method is effective. Finally, the equivalent temperature field image to the typical outfield image is given. © 2021 SPIE.

关键词： Image reconstruction

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