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

共 201 条记录，以下是1-10 订阅

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Depth Map Super-Resolution and Enhancement for Time-of-Flight Cameras 3

Depth Map Super-Resolution and Enhancement for Time-of-Fligh...

引用

conference on optoelectronic imaging and multimedia technology iii

作者： Li, Yangguang Zhang, Lei Zhang, Yongbing Tsinghua Univ Grad Sch Shenzhen Shenzhen Key Lab Broadband Network & Multimedia Beijing Peoples R China

ISBN: (纸本)9781628413465

This paper presents a novel method for solving the super-resolution (SR) and enhancement problem of depth maps captured by the Time-of-Flight (ToF) cameras. Using the registered color images combined with the edge information of original depth image as a prior, and employ the joint sparse representation model to obtain the common representation coefficients as another prior, we can get the solution-the high-resolution (HR) depth maps with low noise and accurate values through the two priors. The results show that our approach possess many advantages compared with the previous state-of-art methods.

关键词： ToF camera depth map super-resolution sparse recovery depth-intensity-upsampling

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Compressive photography based on lens array with coded mask 3

Compressive photography based on lens array with coded mask

引用

conference on optoelectronic imaging and multimedia technology iii

作者： Du, Yuanchao Wang, Xingzheng Wang, Haoqian Dai, Qionghai Tsinghua Univ Key Lab Broadband Network & Multimedia Beijing 100084 Peoples R China

ISBN: (纸本)9781628413465

Plenoptic camera records the 4D light field data by storing the spatial information and angular information. Meanwhile, it introduces the trade-off between spatial resolution and angular resolution. We proposed a new camera design which has been modulated in Fourier domain. High resolution 4D light field could be reconstructed from the coded image by sparse reconstruction. A simulation is carried out to evaluate the performance of the camera design. The reconstructed light field has a better performance than the conventional plenoptic camera.

关键词： light field compressive lens array coded mask

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3D Reconstruction of Large Target by Range Gated Laser imaging 3

3D Reconstruction of Large Target by Range Gated Laser Imagi...

引用

conference on optoelectronic imaging and multimedia technology iii

作者： Li, Sining Yan, Xu Wang, Wei Zhang, Dayong Lu, Wei Harbin Inst Technol Inst Optoelect Harbin 15006 Heilongjiang Peoples R China

ISBN: (纸本)9781628413465

We have developed a whole set of range gated laser imaging system with similar to 3km maximum acquisition distance, the system uses a Nd:YAG electro-optical Q-switched 532nm laser as transmitter, a double micro channel plate as gated sensor, all the components are controlled by the a trigger control unit with accuracy of subnanosecond. A imaging scheme is designed for imaging the large building similar to 500m away, and a sequence of images are obtained in the experiment, which are the basic data for 3D reconstruction;to improve the range resolution, we study the temporal distribution of intensity of the received signal, and use centroid algorithm for data processing. We compare the 3D image with the theoretical model, and the results are corresponding.

关键词： range gated laser imaging 3D reconstruction centroid algorithm

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Ultrasonic televiewer image encoding based on block prediction 3

Ultrasonic televiewer image encoding based on block predicti...

引用

conference on optoelectronic imaging and multimedia technology iii

作者： Zhang, Zhengbing Zhang, Wei Yangtze Univ Elect & Informat Sch Jinzhou 434023 Hubei Peoples R China

ISBN: (纸本)9781628413465

In this paper, an ultrasonic televiewer image encoding method based on block prediction is proposed. The original image is divided into blocks of 8-by-8 pixels. The current block to be encoded is predicted from previously encoded and decoded blocks. The prediction mode that minimizes the differences between the original and predicted is chosen from 9 modes. The prediction difference block is transformed with Discrete Cosine Transform (DCT), and the DCT coefficients are quantized and encoded with lossless algorithm. The prediction modes selected are also encoded. Experimental results show that the performance of the proposed method is much better than JPEG.

关键词： ultrasonic televiewer image image encoding block prediction well logging sonic logging ultrasonic imaging logging image compression compression ratio

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High-resolution light field cameras based on a hybrid imaging system 3

High-resolution light field cameras based on a hybrid imagin...

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conference on optoelectronic imaging and multimedia technology iii

作者： Dai, Feng Lu, Jing Ma, Yike Zhang, Yongdong Chinese Acad Sci Key Lab Intelligent Informat Proc Inst Comp Technol Beijing 100864 Peoples R China

ISBN: (纸本)9781628413465

Compared to traditional digital cameras, light field (LF) cameras measure not only the intensity of rays, but also their light field information. As LF cameras trade a good deal of spatial resolution for extra angular information, they provide lower spatial resolution than traditional digital cameras. In this paper, we show a hybrid imaging system consisting of a LF camera and a high-resolution traditional digital camera, achieving both high spatial resolution and high angular resolution. We build an example prototype using a Lytro camera and a DSLR camera to generate a LF image with 10 megapixel spatial resolution and get high-resolution digital refocused images, multi-view images and all-focused images.

关键词： Light field hybrid imaging system super resolution bilateral filtering

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A design method of the distortionless catadioptric panoramic imaging based on freeform surface 3

A design method of the distortionless catadioptric panoramic...

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conference on optoelectronic imaging and multimedia technology iii

作者： Wu Yi-si Li An Chen Chi Shen Jun-fei Bian Yin-xu Zheng Zhen-rong Zhejiang Univ Dept Opt Engn State Key Lab Modern Opt Instrumentat Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)9781628413465

A design method for the distortionless catadioptric panoramic imaging system is proposed in this paper. The panoramic system mainly consists of two parts, a reflecting surface system with relay lens and a CCD camera. A mapping relationship between the real image plane and the projection surface is established to acquires low distorted imaging features easily. And the design of freeform surface is applied to the reflecting surfaces to correct distortion. After iteratively optimize the freeform surfaces, the image quality is gradually improved. The simulation results show that compared with traditional system, the new freeform surface system has simple design, attaining higher performance and has the advantage of small scene distortion and making the image more suitable and convenient for observing.

关键词： panoramic system reflective distortionless freeform

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Multi-channel super-resolution with Fourier ptychographic microscopy 3

Multi-channel super-resolution with Fourier ptychographic mi...

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conference on optoelectronic imaging and multimedia technology iii

作者： Jiang, Weixin Zhang, Yongbing Dai, Qionghai Tsinghua Univ Shenzhen Key Lab Broadband Network & Multimedia Grad Sch Shenzhen Beijing Peoples R China

ISBN: (纸本)9781628413465

Fourier ptychographic microscopy (FPM) is a recently developed imaging method, which stitches together a sequence of low-resolution images in Fourier space in the iterative manner. However, the high-resolution color image super-resolved by this method always has problems of dispersion when compared to the high-resolution image observed under high-magnification lens. In this paper, we propose a new method for super-resolving multi-channel images. Instead of simply applying the FPM algorithm to RGB channels respectively, the method considers the relationship among each channel, which is employed to correct the result. Experimental results demonstrate that the dispersion can be eliminated, compared with the super-resolving multi-channel image got from original FPM algorithm. Besides, the robustness of Fourier ptychographic imaging is improved and the running time of the super-resolution of color images is reduced.

关键词： Fourier ptychographic miscroscopy image sequence iterative manner color image super-resolution dispersion

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An Effective Guess for Gerchberg-Saxton-type Algorithms 3

An Effective Guess for Gerchberg-Saxton-type Algorithms

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conference on optoelectronic imaging and multimedia technology iii

作者： Wei, Kaiyun Jin, Xin Hu, Yifu Dai, Qionghai Tsinghua Univ Shenzhen Key Lab Broadband Network & Multimedia Grad Sch Shenzhen Beijing Peoples R China

ISBN: (纸本)9781628413465

Gerchberg-Saxton-type (GS-type) algorithms have been widely applied in photonics to reconstruct the object structures. However, using random guesses as the initial inputs, the reconstruction quality of GS-type algorithms is unpredictable. And, it always leads to a large number of iterations to reach convergence. In this paper, a singular value decomposition (SVD) based method is proposed to generate an effective phase guess for GS-type algorithms using a low rank approximation. Experimental results demonstrate that under the same reconstruction error, the proposed SVD based guesses reduce the iteration times by more than 50% on average compared with that of random guesses. Furthermore, they can outperform random guesses both in terms of steady state error and iteration times. Compared with the average performance of random guesses, the proposed approach reduces the steady state error of recovered images by 70.7% on average and reduces the iteration times by 56.1% on average.

关键词： GS-type algorithms SVD low rank approximation scattering imaging

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An auto-gain control algorithm for EMCCD based on dynamic gray-level 3

An auto-gain control algorithm for EMCCD based on dynamic gr...

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conference on optoelectronic imaging and multimedia technology iii

作者： Qian, Yuehong Zhang, Wenwen Liu, Jingjing Chen, Qian Gu, Guohua Nanjing Univ Sci & Technol Jiangsu Key Lab Spectral Imaging & Intelligence S Nanjing 210094 Jiangsu Peoples R China

ISBN: (纸本)9781628413465

According to the adjustability of the gain multiplier of Electron Multiplying CCD, an image gain adjustment method based on dynamic gray-level is proposed. Compared to a fixed value adjustment algorithm, the automatic gain algorithm here is more adaptive, even in low-light conditions, it can achieve better gain values. Experimental results show that the automatic gain algorithm which combines mean values with the dynamic range of histograms meets the requirements. Whether it is during the day or at night, the brightness of image can quickly converge to the optimum range of gray histogram distribution, gray-level dynamic range is also accounted for more than 90%. Judging from the images obtained : the brightness is moderate, details are clear.

关键词： EMCCD Automatic Gain dynamic gray-level low-light-level

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High dynamic range coding imaging system 3

High dynamic range coding imaging system

引用

conference on optoelectronic imaging and multimedia technology iii

作者： Wu, Renfan Huang, Yifan Hou, Guangqi Beijing Inst Technol Sch Optoelect Beijing 100081 Peoples R China Chinese Acad Sci Inst Automat Ctr Res Intelligent Percept & Comp Natl Lab Pattern Recognit Beijing PT-100190 Peoples R China

ISBN: (纸本)9781628413465

We present a high dynamic range (HDR) imaging system design scheme based on coded aperture technique. This scheme can help us obtain HDR images which have extended depth of field. We adopt Sparse coding algorithm to design coded patterns. Then we utilize the sensor unit to acquire coded images under different exposure settings. With the guide of the multiple exposure parameters, a series of low dynamic range (LDR) coded images are reconstructed. We use some existing algorithms to fuse and display a HDR image by those LDR images. We build an optical simulation model and get some simulation images to verify the novel system.

关键词： HDR imaging Coded aperture technique Optical simulation

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