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浏览/检索结果: 共7条，第1-7条 帮助

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Precise motion compensation based on weighted sub-pixel image matching (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Liang H. G.
收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25
This paper proposed a sub-pixel image correlation algorithm that can get more Precise result  its principle is apply the distribute of relativity peak to get weighted multi-pixel comprehensive of location. Image correlation be as to calculates the greyscale relativity of image template and matching image  the relativity of correspond location where match best with template will be most high  and in its neighbour range  the relativity will be still keep high too. We used these pixel in this local area of calculated match point to get sub-pixel accuracy  the relativity of every pixel be used as its weight for participate the sub-pixel calculation. The sub-pixel location is more accuracy than the integer one  we applied this method to perform background compensation in processing the target detecting for video image sequence. At the end of this paper  some experiment data be proposed  it proved this sub-pixel image correlation can obtain better result. 2011 SPIE.  
Design and analysis of power system of micro-electromechanical actuator (EI CONFERENCE) 会议论文  OAI收割
2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China
作者:  Zhang J.;  Zhang J.;  Zhang J.
收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25
In order to apply the electromechanical actuator to tactical mini-missiles  maximum rotational speed of output shafts is greater than 250/s. Test results basically correspond to the requirement of technical indexes. It is proved that this analysis and design method is congruent with the design of micro-electromechanical actuators  this paper researches on the key technology such as load-bearing ability  the system bandwidth can reach 25.3Hz on the condition of no load and 23.4Hz on the condition of load  thus the method is feasible. 2010 IEEE.  rapidity and miniaturization of the micro-electromechanical actuator power system based on the ball screw. First  according to specific technical indexes  the power  electromechanical time constant and the size of the motors are screened originally through theoretical analysis. Finally  based on the characteristics of ball screw transmission  load locus of the micro-electromechanical actuator dynamic system is theoretically analyzed and the optimum speed ratio is determined through parameter optimization. The results of the double closed loop controlled test on the principle prototype show: the system can operate normally with 2.5N.m hinge moment  
Color image quality assessment based on quaternion singular value decomposition (EI CONFERENCE) 会议论文  OAI收割
1st International Congress on Image and Signal Processing, CISP 2008, May 27, 2008 - May 30, 2008, Sanya, Hainan, China
作者:  Liu W.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.
收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25
An effective assessment method for color image is proposed. It is based on the quaternion description for the structural information of color image. The local variance of the luminance layer of color image is taken as the real part of a quaternion  then the three RGB channels of the color image are encoded into the three imaginary parts of the quaternion. The angle between the singular value feature vectors of the quaternion matrices correspond to the reference image and the distorted image is used to measure the structural similarity of the two images. Results from experiments show that the proposed method is better consistent with the human visual characteristics than MSE  PSNR and SSIM. The images whose size is different from that of the reference image can also be assessed by this method. 2008 IEEE.  
Adaptive Image Segmentation based on Fast Thresholding and Image Merging (EI CONFERENCE) 会议论文  OAI收割
16th International Conference on Artificial Reality and Telexistence - Workshops, ICAT 2006, November 29, 2006 - December 1, 2006, Hangzhou, China
作者:  
收藏  |  浏览/下载：14/0  |  提交时间：2013/03/25
Image segmentation is the first essential and important step of low level vision. This paper proposes a novel algorithm for adaptive image segmentation  it can be applied in many conditions  based on thresholding technique and segments merging according to their characteristics combine with spatial position. Our earlier work of getting the entire information of the histogram could help choose the multiple thresholds. However  including complex target segmented. We describe the algorithm in detail and perform simulation experiments. The computation based on pixels can fully parallel processing to save time. 2006 IEEE.  not all the peaks of the histogram correspond to obvious structural unit in the image. Spatial information must be involved. This paper also suggests subjoining segments matching for video image tracking. They will give great help to image segmentation. The proposed algorithm can meet the real-time requirement and lead to higher segmentation accuracy  some types of texture can also be segmented well  
黄土丘陵沟壑区多尺度土地利用变化特征及其演变驱动力研究 学位论文  OAI收割
博士, 北京: 中国科学院研究生院, 2004
张秋菊
收藏  |  浏览/下载：101/0  |  提交时间：2011/08/24
ON DETECTION OF NEUTRINOS IN THE UNIVERSE AND NEUTRINO STAR 期刊论文  OAI收割
A Monthly Journal of Science, 1982, 期号: 4, 页码: 389-392
作者:  Qing CR(庆承瑞);  Wu YS(吴詠时);  He ZX(何祚庥);  Zhang ZX(张肇西);  Zou ZL(邹振隆)
收藏  |  浏览/下载：20/0  |  提交时间：2015/12/07
ON YANG'S SPHERICALLY SYMMETRIC;STATIC GRAVITATIONAL FIELD 期刊论文  OAI收割
Science in China;Ser.A, 1976, 期号: 2, 页码: 199-206
作者:  Chen S(陈时);  He ZX(何祚庥)
收藏  |  浏览/下载：12/0  |  提交时间：2015/12/07