Haijiang Zhu

Beijing University of Chemical Technology

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Ping Yang

National Institute of Metrology

Longbiao He

National Institute of Metrology

Jinglin Zhou

Beijing University of Chemical Technology

Yinchu Wang

National Institute of Metrology

Chenguang Cai

Institute of Mechanics

Ming Yang

Guizhou University

Zhihua Liu

Samsung (China)

Ying Wang

First Affiliated Hospital of Guangzhou Medical University

Tengfei Yang

Beijing University of Chemical Technology

Xuejing Wang

Nanjing University of Aeronautics and Astronautics

Cooperative Institutions

Beijing University of Chemical Technology

Chinese Academy of Sciences

University of Chinese Academy of Sciences

National Institute of Metrology

Institute of Automation

Central South University

University of Electronic Science and Technology of China

Harbin Institute of Technology

Chongqing University

Shanghai Jiao Tong University

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Novel camera self-calibration method with clustering prior and nonlinear optimization from an image sequence

Multimedia Tools and Applications (2024)

Xiaohui Jiang Haijiang Zhu Ning An Binjian Xie Wei Hao

Sequence (biology)

10.1007/s11042-024-19663-1

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Citations (0)

Volume Estimation of Oil Tanks Based on 3D Point Cloud Completion

IEEE Transactions on Instrumentation and Measurement (2024)

Yinchu Wang Yutong Liu Hualong Zeng Haijiang Zhu

10.1109/tim.2024.3476620

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Citations (1)

Measurement of microphone parameters based on high-pressure calibration system

Feng Niu Aijian Zheng Haijiang Zhu Ping Yang Longbiao He

This paper presents a method for measuring a few microphone parameters based on the high-pressure calibration system. The high pressure calibration apparatus and method are first given. Then the linearity-deviations of three microphones are measured, the uncertainties of three microphones are estimated, and the dynamic range limits of three microphones at high sound pressure levels (SPL) are measured. In this study, the range of the linearity-deviations is from −0.02dB to +0.02dB, and that of the uncertainties is less 0.05dB. The dynamic range limit of three microphones is 149dB, 147dB and 162dB, respectively. Compared with the manufacturer parameters, experimental results are consistent with manufacturer data.

Linearity

Pressure measurement

Noise-canceling microphone

10.1109/icma.2012.6283225

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Citations (2)

Bandpass-sampling-based heterodyne interferometer signal acquisition for vibration measurements in primary vibration calibration

Applied Optics (2018)

Ming Yang Haijiang Zhu Chenguang Cai Ying Wang Zhihua Liu

Heterodyne interferometers have been widely used for primary vibration calibration in recent years. Primary vibration calibration performance depends on the precision and real-time nature of vibration measurements, factors determined by the acquisition and demodulation of the heterodyne interferometer signal. This signal is commonly collected using the Nyquist sampling method, requiring devices with high sampling rates and large memories, or a sampling method using a mixer and low-pass filter-analog devices which may create time delays. This study proposes a novel bandpass sampling method that reduces sampling rate and storage capacity without generating time delays. To improve vibration measurement precision, an optimal sampling rate is designed to collect the heterodyne interferometer signal, and the collected signal is demodulated using the phase-unwrapping sine approximation method. The proposed method is compared with existing methods through simulated and experimental data. Experimental results show that the proposed method avoids time delays and high sampling rates, while providing high-precision vibration measurements.

SIGNAL (programming language)

Heterodyne (poetry)

Nyquist–Shannon sampling theorem

Nyquist rate

10.1364/ao.57.008586

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Citations (17)

ARB U-Net: An Improved Neural Network for Suprapatellar Bursa Effusion Ultrasound Image Segmentation

Lecture notes in computer science (2022)

Zhengyu Wang Qi Yang Han Liu Le Mao Haijiang Zhu

Normalization

10.1007/978-3-031-15934-3_2

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Citations (0)

Camera calibration with moving one-dimensional objects

Pattern Recognition (2005)

F. C. Wu Z. Y. Hu Haijiang Zhu

Robustness

10.1016/j.patcog.2004.11.005

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Citations (108)

3D reconstruction for ultrasonic C-scan images of tissue-mimicking phantom based on an improved K-nearest neighbor filtering

Multimedia Tools and Applications (2019)

Haijiang Zhu Tengfei Yang Ping Yang Longbiao He Guanghui Wang

10.1007/s11042-019-7686-1

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Citations (1)

Correction of phase delay caused by mixer and lowpass filter in heterodyne interferometer

Ming Yang Chenguang Cai Ying Wang Haijiang Zhu Zhihua Liu

Phase response is an essential parameter of vibration sensors in primary vibration calibration, heterodyne interferometer was usually used to obtain this parameter. To reduce sampling rate of heterodyne interferometer signal and sampling number, analog mixer and lowpass filter are used to down-convert the interferometer signal. However, the using of analog devices will introduce additional phase delay for the measurement of the phase response, it leads to the measurement by the calibration is unreliable. A novel correction of phase delay method was proposed to precisely measure the phase response of the vibration sensors. Experiment results show the performance of the proposed correction method.

Heterodyne (poetry)

SIGNAL (programming language)

Heterodyne detection

10.1117/12.2282262

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Citations (0)

Homography Estimation Based on Order-Preserving Constraint and Similarity Measurement

IEEE Access (2018)

Haijiang Zhu Xin Wen Fan Zhang Xuejing Wang Guanghui Wang

Homography is an important concept that has been extensively applied in many computer vision applications. However, accurate estimation of the homography is still a challenging problem. The classical approaches for robust estimation of the homography are all based on the iterative RANSAC framework. In this paper, we explore the problem from a new perspective by finding four point correspondences between two images given a set of point correspondences. The approach is achieved by means of an order-preserving constraint and a similarity measurement of the quadrilateral formed by the four points. The proposed method is computationally efficient as it requires much less iterations than the RANSAC algorithm. But this method is designed for small camera motions between consecutive frames in video sequences. Extensive evaluations on both synthetic data and real images have been performed to validate the effectiveness and accuracy of the proposed approach. In the synthetic experiments, we investigated and compared the accuracy of three types of methods and the influence of the proportion of outliers and the level of noise for homography estimation. We also analyzed the computational cost of the proposed method and compared our method with the state-of-the-art approaches in real image experiments. The experimental results show that the proposed method is more robust than the RANSAC algorithm.

RANSAC

Homography

Similarity (geometry)

10.1109/access.2018.2837639

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Citations (5)

An Easy Technique for Fisheye Camera Calibration

Haijiang Zhu Fuchao Wu

Quadrangle

Homography

Line (geometry)

Cross-ratio

Distortion (music)

Square (algebra)

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Citations (0)