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公开(公告)号：US20240168721A1
公开(公告)日：2024-05-23
申请号：US18403575
申请日：2024-01-03
Inventor： Bo XU , Libing Bai , Xiaowei Luo , Jia Zhao , Yuhua Cheng , Hang Geng , Kai Chen , Yifan Wang , Gen Qiu
IPC: G06F7/58
CPC classification number: G06F7/582
Abstract: A random transient power test signal generator based on three-dimensional memristive discrete map, which utilizes a three-dimensional parallel bi-memristor Logistic map module to generate two pseudo-random sequences, and based on the sequences, uses two waveform output modules to generate transient voltage and transient current signals respectively, thus the random transient power testing signal is obtained. The map can significantly improve the complexity of chaos and greatly extend its range of chaos. In addition, a performance evaluation shows the map has more robust hyperchaotic behavior in much larger chaos range. Moreover, the random sequences generated by the map module combines with DDS, which can generate a transient power signal with completely random period, starting phase and ending phase. Thus, a stimulated output of the high-precision transient power testing signal with random characteristic is realized, which makes the development and calibration of high-precision measurement of power meters more convenient.
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2.发明授权公开(公告)号：US11641457B2
公开(公告)日：2023-05-02
申请号：US17680390
申请日：2022-02-25
Inventor： Chun Yin , Yuhua Cheng , Zeqi Wang , Xutong Tan , Kai Chen , Gen Qiu , Jianhao Luo , Junjie Liu , Zhibo Li , Aolin Yang
IPC: H04N13/15 , H04N13/239 , H04N13/254 , G06T7/33 , H04N13/246
Abstract: A method for high-precision true color three dimensional reconstruction of mechanical component. Firstly performs image acquisition: the left and right high-resolution grayscale cameras are fixed at same height and spaced at certain distance, an optical transmitter fixed between the two grayscale cameras, and low-resolution color camera fixed above optical transmitter, thus images of measured high-precision mechanical component are shot. Then performs image processing: all images are transmitted to a computer, which uses image processing to record surface information of measured high-precision mechanical component in the point cloud by high-precision true color three-dimensional reconstruction, which reflects color texture information of the surface, so as to realize the non-contact high-precision true color three dimensional reconstruction of high-precision mechanical component. The method uses binocular high-precision grayscale cameras instead of binocular color cameras, which broadens the range of capture wavelengths, retains richer texture details of high-precision mechanical component and improves accuracy of measurement.
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公开(公告)号：US11587250B2
公开(公告)日：2023-02-21
申请号：US17401760
申请日：2021-08-13
Inventor： Yuhua Cheng , Chun Yin , Xiao Yang , Kai Chen , Xuegang Huang , Gen Qiu , Yinze Wang
Abstract: The present invention provides a method for quantitatively identifying the defects of large-size composite material based on infrared image sequence, firstly obtaining the overlap area of an infrared splicing image, and dividing the infrared splicing image into three parts according to overlap area: overlap area, reference image area and registration image area, then extracting the defect areas from the infrared splicing image to obtain P defect areas, then obtaining the conversion coordinates of pixels of defect areas according to the three parts of the infrared splicing image, and further obtaining the transient thermal response curves of centroid coordinate and edge point coordinates, finding out the thermal diffusion points from the edge points of defect areas according to a created weight sequence and dynamic distance threshold εttr×dp_max, finally, based on the thermal diffusion points, the accurate identification of quantitative size of defects are completed.
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