中国科学院机构知识库网格系统: 检索

Synchrotron X-ray based particle image velocimetry to measure multiphase streamflow and densitometry 期刊论文 OAI收割
RADIATION PHYSICS AND CHEMISTRY, 2022, 卷号: 200, 页码: 8
作者: Ge,Mingming; Sun,Chuanyu; Zhang XL(张鑫磊); CoutierDelgosha,Olivier; Zhang,Guangjian

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收藏 | 浏览/下载：49/0 | 提交时间：2022/11/21

X-ray image processing X-ray attenuation technique Vapor volume fraction Particle image velocimetry Multiphase flow measurement

Modelling the stability of a soil-rock-mixture slope based on the digital image technology and strength reduction numerical manifold method 期刊论文 OAI收割
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS, 2021, 卷号: 126, 页码: 45-54
作者: Yang, Yongtao; Chen, Tao; Wu, Wenan; Zheng, Hong

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收藏 | 浏览/下载：52/0 | 提交时间：2021/05/25

Soil-rock mixtures Strength reduction technique Numerical manifold method Digital image processing technology Slope stability analysis

RAPID DETECTION OF VITAMIN C CONTENT IN FRUITS AND VEGETABLES USING A DIGITAL CAMERA AND COLOR REACTION 期刊论文 OAI收割
QUIMICA NOVA, 2020, 卷号: 43
作者: Zhao, Wen-zhu; Cao, Ping-ping; Zhu, Yuan-yang; Liu, Sheng; Gao, Hong-Wen

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收藏 | 浏览/下载：77/0 | 提交时间：2021/04/26

measurement technique vitamin C content digital camera image processing multivariate fitting

Image mosaic technique based on the information of edge (EI CONFERENCE) 会议论文 OAI收割
2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012, July 31, 2012 - August 2, 2012, Guilin, Guangxi, China
作者: Wang Y.-Q.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

Image mosaic is an important branch in the field of image processing. This paper designs and realizes an image mosaic technique based on the information of edge. The technology is suitable for engineering application. First of all two images of the adjoining frames are processed by convolution operation get the edge images. And then we cut edge image into pieces and compute their spatial frequency. According to the value of the spatial frequency select reasonable registration model group. We compute correlation strength and the value of movement offset which are the model group and the current frame edge image. We can complete image mosaic by them. We use video sequence which of the resolution is 1024 * 768 do the experiment. The results show that the method has good effect and strong adaptability. Algorithm is high efficiency which running time is 24 ms. It is suitable for real-time processing requirements of the application. This method is an effective mosaic technique which is suitable for engineering application. 2012 IEEE.

Image registration based on Mexican-hat wavelets and pseudo-Zernike moments (EI CONFERENCE) 会议论文 OAI收割
2012 World Automation Congress, WAC 2012, June 24, 2012 - June 28, 2012, Puerto Vallarta, Mexico
作者: Liu Y.; Liu Y.; Liu Y.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

Image registration is a key technique in pattern recognition and image processing and it is widely used in many application areas such as computer vision remote sensing image fusion and object tracking. A method for image registration combining Mexican-hat wavelets and pseudo-Zernike moments is proposed. Firstly feature points are extracted using scale-interaction Mexican-hat wavelets in the reference image and sensed image respectively. Then pseudo-Zernike moments are used to match them and classical RANSAC used to eliminate the wrong matches. And then the well match points are used to estimate the best affine transform parameters by least squares minimization. At last the sensed image is transformed and resampled to accomplish the image registration. The experiments indicate that the proposed algorithm extracts feature points and matches them exactly and eliminates wrong matched points effectively and achieves nice registration results. 2012 TSI Press.

Image enhancement techniques used for THz imaging 会议论文 OAI收割
international symposium on photoelectronic detection and imaging 2011: terahertz wave technologies and applications, beijing, china, may 24, 2011 - may 26, 2011
作者: FanWenhui

收藏 | 浏览/下载：21/0 | 提交时间：2012/07/09

THz THz imaging Digital image processing technique

Image parallel processing based on GPU (EI CONFERENCE) 会议论文 OAI收割
2010 IEEE International Conference on Advanced Computer Control, ICACC 2010, March 27, 2010 - March 29, 2010, 445 Hoes Lane - P.O.Box 1331, Piscataway, NJ 08855-1331, United States
作者: Wang J.-L.; Wang J.-L.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

In order to solve the compute-intensive character of image processing based on advantages of GPU parallel operation parallel acceleration processing technique is proposed for image. First efficient architecture of GPU is introduced that improves computational efficiency comparing with CPU. Then Sobel edge detector and homomorphic filtering two representative image processing algorithms are embedded into GPU to validate the technique. Finally tested image data of different resolutions are used on CPU and GPU hardware platform to compare computational efficiency of GPU and CPU. Experimental results indicate that if data transfer time between host memory and device memory is taken into account speed of the two algorithms implemented on GPU can be improved approximately 25 times and 49 times as fast as CPU respectively and GPU is practical for image processing. 2010 IEEE.

Micro-motion exposure method based on PZT piezoelectric ceramics (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, June 17, 2009 - June 19, 2009, Beijing, China
作者: Meng Z.; Meng Z.

收藏 | 浏览/下载：103/0 | 提交时间：2013/03/25

There mainly is laser digital photofinishing technique and digital photofinishing technique based on LCD consisting of TFT and LCOS in the digital photofinishing field at the present time. The former have a good many merit such as wide color gamut high processing rate large output size and high brightness but his cost is very high his maintain technique being comparatively complex that result in difficult use for people. The utilization ratio of the latter is low because of lower resolution and lower aperture ratio for LCD but the digital photofinishing based on LCD have lower cost and higher utilization ration being suitable for people's current standard of living. Considering above mentioned problem a micro-motion exposure method based on PZT piezoelectric ceramics used in digital image photofinishing is presented. The two-dimension micro-motion exposure system consisting of PZT piezoelectric ceramics LCD panel polarizing film and spring strip is designed. By means of PZT piezoelectric ceramics the LCD panel is removed about the one half of the pixel size of the LCD panel for four times from the original place at the same time imaging system is exposed four times at the printing paper. The software is used to control the time synchronization the exposure time and motion range of the LCD panel. The system has advantages such as shorter response time than 0.1seconds lesser motion error than 0.01 microns high stability and repeatability. Experimental results show that the proposed micro-motion exposure method improve the picture brightness and enlarge output size at the meantime reducing the cost of the system. 2009 SPIE.

Autofocusing technique based on image processing for remote-sensing camera (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2007 - Image Processing, September 9, 2007 - September 12, 2007, Beijing, China
作者: Wang X.; Xu S.-Y.; Wang X.; Wang X.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

The key to the auto-focusing technique based on image processing is the selection of focus measure reflecting image definition. Usually the measures derived are on the premise of the images acquired with the same scene. As for the remote-sensing camera working in linear CCD push-broom imaging mode the premise doesn't exist because the scenes shot are different at any moment which brings about difficulties to the selection of the focus measure. To evaluate the image definition the focus measure based on blur estimation for rough adjustment is proposed to estimate the focused position by only two different lens positions which greatly saves the auto-focusing time. Another evaluation function based on edge sharpness is developed to find best imaging position in the narrow range. Simulations show that the combination of the two measures has the advantages of rapid reaction and high accuracy.

Displacement estimation by the phase-shiftings of fourier transform in present white noise (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wu Y.-H.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

Displacement estimation is a fundamental problem in Real-time video image processing. It can be typically approached by theories based on features in spatial domain. This paper presents an algorithm which improves the theory for estimating the moving object's displacement in spatial domain by its Fourier transform frequency spectrum. Because of the characters of Fourier transform the result is based on all the features in the image. Utilizing shift theorem of Fourier transform and auto-registration the algorithm employs the phase spectrum difference in polar coordinate of two frame images sequence with the moving target1 2. The method needn't transform frequency spectrum to spatial domain after calculation comparing with the traditional algorithm which has to search Direc peak and it reduces processing time. Since the technique proposed uses all the image information including all the white noise in the image especially and it's hard to overcome the aliasing from noises but the technique can be an effective way to analyze the result in little white noise by the different characters between high and low frequency bands. It can give the displacement of moving target within 1 pixel of accuracy. Experimental evidence of this performance is presented and the mathematical reasons behind these characteristics are explained in depth. It is proved that the algorithm is fast and simple and can be used in image tracking and video image processing.