中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共5条，第1-5条

帮助

条数/页：排序方式：
	Distribution of the tropical Pacific surface zonal wind anomaly and its relation with two types of El Nio CNKI期刊论文 OAI收割 2013 作者: Wang Y(汪洋); Chen JN(陈锦年); Wang HN(王宏娜) \| 收藏 \| 浏览/下载：3/0 \| 提交时间：2024/12/18 surface zonal wind anomaly CP(central Pacific) El Ni o rotated empirical orthogonal function rotated singular value decomposition zonal convergence physical process
	Distribution of the tropical Pacific surface zonal wind anomaly and its relation with two types of El Nino 期刊论文 OAI收割 CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY, 2013, 卷号: 31, 期号: 5, 页码: 1137-1152 作者: Wang Yang; Chen Jinnian; Wang Hongna 收藏 \| 浏览/下载：25/0 \| 提交时间：2014/07/17 surface zonal wind anomaly CP (central Pacific) El Nino rotated empirical orthogonal function rotated singular value decomposition zonal convergence physical process
	Image quality assessment based on gradient complex matrix (EI CONFERENCE) 会议论文 OAI收割 2012 International Conference on Systems and Informatics, ICSAI 2012, May 19, 2012 - May 20, 2012, Yantai, China 作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Wang Y. 收藏 \| 浏览/下载：26/0 \| 提交时间：2013/03/25 An image quality assessment model based on gradient complex matrix is proposed. The vertical and horizontal gradient information of grayscale image is calculated. Complex number is used to construct the measuring matrix. Singular value decomposition is performed in order to obtain the main structure information of the image. The singular value feature vectors of the image gradient complex matrices corresponding to the reference image and the distorted image are used to measure the structural similarity of the two images. PSNR is taken as a tool to evaluate the gradient distribution similarity. Their properties are analyzed by using LIVE database and nonlinearity regression function. 2012 IEEE.
	Research on infrared dim-point target detection and tracking under sea-sky-line complex background (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China 作者: Dong Y.-X.; Zhang H.-B.; Li Y.; Li Y.; Li Y. 收藏 \| 浏览/下载：116/0 \| 提交时间：2013/03/25 Target detection and tracking technology in infrared image is an important part of modern military defense system. Infrared dim-point targets detection and recognition under complex background is a difficulty and important strategic value and challenging research topic. The main objects that carrier-borne infrared vigilance system detected are sea-skimming aircrafts and missiles. Due to the characteristics of wide field of view of vigilance system the target is usually under the sea clutter. Detection and recognition of the target will be taken great difficulties.There are some traditional point target detection algorithms such as adaptive background prediction detecting method. When background has dispersion-decreasing structure the traditional target detection algorithms would be more useful. But when the background has large gray gradient such as sea-sky-line sea waves etc.The bigger false-alarm rate will be taken in these local area.It could not obtain satisfactory results. Because dim-point target itself does not have obvious geometry or texture feature in our opinion from the perspective of mathematics the detection of dim-point targets in image is about singular function analysis.And from the perspective image processing analysis the judgment of isolated singularity in the image is key problem. The foregoing points for dim-point targets detection its essence is a separation of target and background of different singularity characteristics.The image from infrared sensor usually accompanied by different kinds of noise. These external noises could be caused by the complicated background or from the sensor itself. The noise might affect target detection and tracking. Therefore the purpose of the image preprocessing is to reduce the effects from noise also to raise the SNR of image and to increase the contrast of target and background. According to the low sea-skimming infrared flying small target characteristics the median filter is used to eliminate noise improve signal-to-noise ratio then the multi-point multi-storey vertical Sobel algorithm will be used to detect the sea-sky-line so that we can segment sea and sky in the image. Finally using centroid tracking method to capture and trace target. This method has been successfully used to trace target under the sea-sky complex background. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
	Hausdorff dimension of generalized statistically self-affine fractals 期刊论文 OAI收割 ACTA MATHEMATICA SCIENTIA, 2004, 卷号: 24, 期号: 3, 页码: 421-433 作者: Yu, JG; Ding, LX 收藏 \| 浏览/下载：29/0 \| 提交时间：2015/07/15 self-affine contraction map statistically recursive set statistically self-affine set Hausdorff measure Hausdorff dimension singular value function