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Frequency domain based super-resolution method for mixed-resolution multi-view images

Journal of Systems Engineering and Electronics 2016年第6期27卷 1303-1314页

作者： Zhizhong Fu Yawei Li Yuan Li Lan Ding Keyu Long School of Communication and Information Engineering University of Electronic Science and Technology of ChinaChengdu 611731China The Second Research Institute of Civil Aviation Administration of China Chengdu 610041China

Super-resolution (SR) techniques, which are based on single or multi-frame low-resolution (LR) images, have been extensively investigated in the last two decades. Mixed-resolution multiview video format plays an important role in three-dimensional television (3DTV) coding scheme. Previous work considers multiview or multi-camera images and videos at the same resolution, which performs well under the planar model without or with little projection error among the videos captured by different cameras. In recent years, several researchers have discussed the SR problem in mixed-resolution multi-view video format, where the superresolved image is created using the up-sampled version of the LR image and the high frequency components extracted from the warped image in the adjacent high-resolution (HR) views. Unfortunately, the output HR images suffer from artifacts caused by depth error. To obtain the detailed texture and edge information from the HR image as much as possible, while preserving the structure of the LR image, a novel SR reconstruction algorithm is proposed. The algorithm is composed of three components: the structure term, the detail information term, and the regularization term. The first term preserves the structure similarity of the LR image; the second term extracts detailed information from the adjacent HR image; and the last term ensures the uniqueness of the solution. Experimental results show the effectiveness and robustness of the proposed algorithm, which achieves high performance both subjectively and objectively. © 2016 Beijing Institute of Aerospace Information.

关键词： Cameras Edge detection Frequency domain analysis Image reconstruction optical resolving power

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Multi-Modality Medical Image Fusion Based on Wavelet Analysis and Quality Evaluation

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Journal of Systems Engineering and Electronics 2001年第1期12卷 42-48页

作者： Yu Lifeng & Zu Donglin Institute of Heavy Ion Physics, Peking University, 100871, P. R. China Wang Weidong General Hospital of PLA, Beijing 100853, P. R. China Bao Shanglian Institute of Heavy Ion Physics, Peking University, 100871, P. R. China Institute of Heavy Ion Physics Peking University 100871 P. R. China General Hospital of PLA Beijing 10085. P. R. China

Multi-modality medical image fusion has more and more important applications in medical image analysis and understanding. In this paper, we develop and apply a multi-resolution method based on wavelet pyramid to fuse medical images from different modalities such as PET-MRI and CT-MRI. In particular, we evaluate the different fusion results when applying different selection rules and obtain optimum combination of fusion parameters.

关键词： Computer simulation Computerized tomography Image analysis Image quality Image understanding Magnetic resonance imaging optical resolving power

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Simple and robust digital holography for high-resolution imaging

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Chinese Optics Letters 2008年第3期6卷 165-167页

作者：王华英王大勇赵洁谢建军 College of Applied Sciences Beijing University of Technology

Based on the point spread function of holographic system, the lateral resolution of digital holographic imaging system without any pre-magnification is studied. The expression of resolution limitation of holo-graphic imaging system is thus presented. We investigate the possibilities to improve the lateral resolution. The simple experimental setup with an off-axis arrangement is built. By using a U.S. Air Force （USAF） test target as microscopic object, the recorded holograms are reconstructed digitally based on the principle of Fresnel diffraction. The lateral resolution of 2.76 μm without any pre-magnification is demonstrated experimentally, which matches the theoretical prediction well.

关键词： Holography optical resolving power optical transfer function

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Wavelet-Based Mixed-Resolution Coding Approach Incorporating with SPT for the Stereo Image

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Journal of Systems Engineering and Electronics 2001年第3期12卷 39-44页

作者： Xu, C. Zhang, Z. An, P. Communication School Shanghai University Shanghai 200072 China

With the advances of display technology, three-dimensional(3-D) imaging systems are becoming increasingly popular. One way of stimulating 3-D perception is to use stereo pairs, a pair of images of the same scene acquired from different perspectives. Since there is an inherent redundancy between the images of a stereo pairs, data compression algorithms should be employed to represent stereo pairs efficiently. The proposed techniques generally use block-based disparity compensation. In order to get the higher compression ratio, this paper employs the wavelet-based mixed-resolution coding technique to incorporate with SPT-based disparity-compensation to compress the stereo image data. The mixed-resolution coding is a perceptually justified technique that is achieved by presenting one eye with a low-resolution image and the other with a high-resolution image. Psychophysical experiments show that the stereo image pairs with one high-resolution image and one low-resolution image provide almost the same stereo depth to that of a stereo image with two high-resolution images. By combining the mixed-resolution coding and SPT-based disparity-compensation techniques, one reference (left) high-resolution image can be compressed by a hierarchical wavelet transform followed by vector quantization and Huffman encoder. After two level wavelet decompositions, for the low-resolution right image and low-resolution left image, subspace projection technique using the fixed block size disparity compensation estimation is used. At the decoder, the low-resolution right subimage is estimated using the disparity from the low-resolution left subimage. A full-size reconstruction is obtained by upsampling a factor of 4 and reconstructing with the synthesis low pass filter. Finally, experimental results are presented, which show that our scheme achieves a PSNR gain (about 0.92dB) as compared to the current block-based disparity compensation coding techniques.

关键词： Data reduction Decoding Image coding Image compression Image reconstruction Imaging techniques Motion compensation Motion estimation optical resolving power Projection systems Stereo vision Wavelet transforms

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Modified Multi-Resolution Telescopic Search Algorithm for Block-Matching Motion Estimation

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Journal of Systems Engineering and Electronics 2001年第3期12卷 90-96页

作者： Zhang, W. Zhou, R. Kondo, T. Institute of Microelectronics Tsinghua University Beijing 100084 China

This paper presents a modified multi-resolution telescopic search algorithm (MRTlcSA) for the block-matching motion estimation. A novel inverse telescopic search is substituted for the conventional telescopic search, that reduces the on-chip memory size and memory bandwidth for VLSI implementation. In addition, strategies of motion track and adaptive search window are applied to reduce the computational complexity of motion estimation. Simulation results show that, compared with the MRTleSA, the proposed algorithm reduces the computational load to only 30% while preserving almost the same image quality. Comparisons on hardware cost and power consumption of the VLSI implementations using the two algorithms are also presented in the paper.

关键词： Algorithms Bandwidth Computational complexity Computer simulation Image quality Microprocessor chips optical resolving power optical telescopes Pattern matching VLSI circuits

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Litho-Asym Vnet: super-resolution lithography modeling with an asymmetric V-net architecture

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Science China(Information Sciences) 2023年第12期66卷 301-302页

作者： Qing ZHANG Yuhang ZHANG Wei LU Huajie HUANG Zheng ZHONG Congshu ZHOU Yongfu LI Department of Micro-Nano Electronics and Mo E Key Lab of Artificial Intelligence Shanghai Jiao Tong University Primarius Technologies Co. Ltd.

Lithography simulation is key to the preparation of mask data and verification of mask patterns [1], which enhances design-to-wafer fidelity and minimizes distortions. However,the complexity of lithography simulation has tremendously increased with the decrease in feature size, prolonging the simulation cycle. Hence, an accurate and fast lithography simulation is in great demand.

关键词： optical resolving power

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Gauss-Newton based kurtosis blind deconvolution of spectroscopic data

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Chinese Optics Letters 2006年第8期4卷 490-492页

作者：袁景和胡自强 Institute of Science and Technology for Opto-Electron Information Yantai University

The spectroscopic data recorded by dispersion spectrophotometer are usually degraded by the response function of the instrument. To improve the resolving power, double or triple cascade spectrophotometer and narrow slits have been employed, but the total flux of the radiation decreases accordingly, resulting in a lower signal-to-noise ratio （SNR） and a longer measuring time. However, the spectral resolution can be improved by mathematically removing the effect of the instrument response function. Based on the ShalviWeinstein criterion, a Gauss-Newton based kurtosis blind deconvolution algorithm for spectroscopic data is proposed. Experiments with some real measured Raman spectroscopic data show that this algorithm has excellent deconvolution capability.

关键词： optical resolving power Signal to noise ratio Spectrophotometers

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Read-only memory disk with AgO_x super-resolution mask layer

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Chinese Optics Letters 2005年第2期3卷 113-115页

作者：张锋王阳徐文东施宏仁干福熹 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

A novel read-only memory （ROM） disk with an AgOx mask layer was proposed and studied in this letter, The AgOg, films sputtered on the premastered substrates, with pits depth of 50 nm and pits length of 380 nm, were studied by an atomic force microscopy. Tile transmittances of these AgOx films were also measured by a spectrophotometer. Disk measurement was carried out by a dynamic setup with a laser wavelength of 632.8 nm and a lens numerical aperture （NA） of 0.40. The readout resolution limit of this setup was λ/（4NA）（400 nm）. Results showed that the super-resolution readout happened only when the oxygen flow ratios were at suitable values for these disks. The best super-.resolution performance was achieved at the oxygen flow ratio of 0.5 with the smoothest fihn surface. The super-resolution readout mechanism of these ROM disks was analyzed as well.

关键词： Atomic force microscopy Compact disks Films Masks optical resolving power Silver compounds Spectrophotometers

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Light energy matching method in high-resolution image reconstruction

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Chinese Optics Letters 2003年第5期1卷 275-277页

作者：王凌徐之海冯华君张平 State Key Lab of Modern optical Instrumentation Zhejiang UniversityHangzhou 310027

Many approaches for high-resolution image reconstruction have been proposed in some literatures. One of the most commonly ways is to reconstruct a high-resolution image from a number of rotated and translated images with low resolution. In this process, the exposure difference among original images will decrease the quality of the reconstructed image. In order to remove the influence of the exposure difference, a light energy matching method is proposed in this paper. The theoretical analysis is illustrated in details. Experimental results show that the theoretical analysis is correct and the proposed method is valid.

关键词： optical resolving power

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Methods of calibration to optical trapping force upon non-spherical cells

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Chinese Optics Letters 2006年第12期4卷 722-724页

作者：喻有理张镇西李政王小力 The Key Laboratory of Biomedical Information Engineering of Ministry of Education and Institute of Biomedical EngineeringXi'an Jiaotong UniversityXi'an 710049 School of ScienceXi'an Jiaotong UniversityXi'an 710049 The Key Laboratory of Biomedical Information Engineering of Ministry of Education and Institute of Biomedical EngineeringXi'an Jiaotong UniversityXi'an 710049 School of Science Xi'an Jiaotong UniversityXi'an 710049

The dynamical equation of a trapping cell is solved to find calibration methods for the trapping force, and two methods are compared by synthetic experiment data. Results indicate that： Boltzmann distribution method （BDM） is available for the force calibration of non-spherical or anisotropic cells in arbitrary trap potential; the mean square displacement method （MSDM） is available only for a symmetric harmonic optical trap. The spatial resolution requirement of the calibration system is about a nanometer. The results agree with the reported experiments.

关键词： Light measurement optical devices optical resolving power

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