共查询到20条相似文献，搜索用时 15 毫秒
1.
GU Zheng-tian XU Yan-ping CHEN Jia-bi 《光电子快报》2006,2(1):27-30
Because of its high sensitivity to external refractiveindex,the long-period fiber grating(LPFG) has beenused as chemical sensor1-3.Now the multi-clad LPFGwiththe fil ms coated on cladding area of the fiber grat-ing has drawn much attention[4].It cani mpro… 相似文献
2.
MA Yi ZHANG Jie CUI Ting-wei 《光电子快报》2006,2(1):58-62
Redtide is an abnormal ecology phenomenon causedby excessive reproduction or congregation of plankton.Usually,its biomass data is derived fromin-situ watersample analysisin a redtide area,andthe plankton con-centration is judged by the Japanese scholar Ad… 相似文献
3.
WANG Bing-jian LIU Shang-qian CHENG Yu-bao 《光电子快报》2006,2(3):225-228
Infraredfocal plane array(IRFPA) is a kind of infra-red detector array whichis sensitive toinfraredradiationandintegrated with signal processing circuits .The IRF-PAi maging systemhas advantages of si mple configura-tion,high reliability,high sensitivity … 相似文献
4.
Neural networks provide massive parallelism,robust-ness ,and approxi mate reasoning,which are i mportantfor dealing with uncertain,inexact ,and ambiguous data,withill-defined problems and sparse data sets[1].It hasbeen proved that a neural network system … 相似文献
5.
ZHANG Hao HUANG Zhan-hua YU Dao-ying 《光电子快报》2005,1(1):69-71
Registrationoffeaturepointsisacommonproblemof imageregistration[1,2].Theproblemaddressedinthispaperistosearchfortheoptimaltransformationthat makesthebestalignmentoftwofeaturepointsetswith outcorrespondences.Theregistrationofpointsetscanbeformulatedintermsofglobaloptimizationwhicha voidsbothlocalentrapmentandexhaustivesearch.In theframeworkofoptimization,theobjectivefunctiontobeminimizedisusuallymappedtothesimilaritybe tweenthepointsets,whilethefunctionalvariablesare thetransformationparamet… 相似文献
6.
LI Jun-chang PENG Zu-jie CHEN Jin-bo 《光电子快报》2006,2(5):379-382
With the development of computer and CCD tech-niques ,a technique of capturing the complex amplitudeof object light accordingto anintensity holographrecor-ded by a CCD detector array has been becoming an in-teresting area[1-4].In reference [5] the frequen… 相似文献
7.
ZHOU Hong QIAO Xue-guang SHAO-Jun WANG Hong-liang FENG De-quan 《光电子快报》2006,2(5):329-333
Based on super-molecule self-assembly and entropy-driven self-assembly mechanisms,the coupling agent was evolved into colloid spheres with average diameter of 2-2.3 μm on the fiber Bragg grating （FBG） with silicon substrate, and the coupling mechanism among polymer, coupling agent and FBG was analyzed. The polymer coated FBG pressure sensors was capsulated by uniform coupling mode and self-assembly coupling mode of the coupling agent respectively, and their performance parameters were tested. It was shown, adopting the self-assembly coating of coupling agent and with the same other capsulated technologies,that the measuring range of the sensor expanded from 0.6 MPa to 1.6 MPa,the repeated times for coupling failure increased from 54 to 125 times and the pressure sensitivity coefficient enhanced from 1.09 to 2.98. By controlling the diameter of the spheres and the line density,the measuring range and the sensitivity of the FBG pressure sensors can be obviously improved. 相似文献
8.
YU Rui-xing LI Yan-jun ZHANG Ke 《光电子快报》2006,2(1):72-74
Edge detectionis ani mportant step for i mage analy-sis . Although most edge detection algorithms can per-form well for clear i mages ,they often produce missingedges andextra edgesin noisyi mages caused bythe dis-continuitiesin graylevel due to noises .H… 相似文献
9.
WANG Jian ZHANG Quan TANG Chao-jing 《光电子快报》2006,2(3):209-212
Quantum cryptography combines quantum theorywithclassical cryptography,which provides uncondition-ally secure information exchange by using quantumeffects .Many advances have been made in quantumcryptography in recent years ,including quantum keydistribut… 相似文献
10.
MA Yan LI Shun-bao 《光电子快报》2006,2(5):383-385
Recently,a few researchers coupled the eigenfacemethod[1]with wavelet transform or other methods toovercome the li mitations of eigenface method[2-5].All ofthe above methods are based on performing wavelettransformof thei mage database before the training… 相似文献
11.
GAO Chao JIANG Da-qin Guo Yong-cai 《光电子快报》2006,2(5):386-388
Iris i mage recognition is a biometric feature recogni-tiontechnology developedin 1990s .Compared with oth-er biometric feature recognition,iris recognition hasmany advantages suchas uniqueness ,highstability,non-invasive,high peculiarity,anti-false and l… 相似文献
12.
YIN Hong CHEN Zeng-qiang YUAN Zhu-zhi 《光电子快报》2006,2(5):369-372
Many digital watermarking methods have been pro-posedin the last fewyears[1 ,3].It is a tradeoff problemsince whenthe robustness of a watermarkincreases ,theperceptual quality of the contents will be degraded.Hence,the main goal of i mproving a watermarki… 相似文献
13.
LIU Xuan JIA Hui-bo CHENG Ming 《光电子快报》2006,2(6):459-462
In our previous work[1-3],we established a new ap-proach which has mass disk buffer in optical jukeboxand can be accessed directly from network in a massstorage system,and namedthis systemas network atta-ched optical jukebox (NAOJ) .In order to i mprove i… 相似文献
14.
LI Bao-sheng LIU Yong ZHAI Yu-feng WANG An 《光电子快报》2006,2(1):75-77
The precise determination of the ZOPDfor the whitelight interferometryis essential toits applicationsinthefield of measurements of surface profile,height ,anddepth,and quality control[1-5].The ZOPDis a positionininterferogram with the highest envelope pea… 相似文献
15.
ZHANG Feng ZHONG Jin-gang 《光电子快报》2006,2(1):31-33
A double-prism adaptive optical design in surface plasma resonance （SPR） sensor is proposed,which consists of two identical isosceles right-triangular prisms. One prism is used as a component of Kretschmann configuration, and the other is for regulation of the optical path. When double-prism structure is angle-scanned by an immovable incident ray, the output ray will be always parallel with the incident ray and just has a small displacement with the shift of output point. The output ray can be focused on a fixed photodetector by a convex lens. Thus it can be avoided that a prism and a photodetector rotate by 8 and 28 respectively in conventional angular scanning SPR sensor. This new design reduces the number of the movable components, makes the structure simple and compact, and makes the manipulation convenient. 相似文献
16.
SUN Zheng YU Dao-yin 《光电子快报》2006,2(1):68-71
Since actual cardiac and arterial motion is non-rigidand non-uniformbothin space andinti me[1],the quan-tification of dynamic 3-Dcurves with 2-D projections isinaccurate and sensitive to view angles . Ruan[2]andPuentes[3]reconstructed 3-D arterial centerl… 相似文献
17.
LIAN Jing WANG Ke 《光电子快报》2006,2(5):376-378
Recent years ,wavelet transformhas been widely usedin i mage compression because of its outstanding ti me-frequency localization ability and de-correlation ability.Among all the i mage compression algorithms ,EZW[1]and SPIHT[2]are two of the most influent… 相似文献
18.
FENG Peng PAN Ying-jun WEI Biao JIN Wei MI De-ling 《光电子快报》2006,2(3):229-232
Recently,there has been a growing awareness to theobservation that wavelets may not be the best choiceforrepresenting natural i mages .This observation is due tothe fact that wavelets are blindtothe smoothness alongthe edges commonly found in i mages .In … 相似文献
19.
SONG Yi-zhong ZHANG Bin FU Lin HE An-zhi 《光电子快报》2006,2(1):63-67
A new algorithm for iterative reconstruction is suggested. It is named simple self-correlative algebraic reconstruction technique （SSART）. With numerical simulation experiments, SSART was applied in reconstructing a non-ideal-bordered field in order to test its reconstructive effect, For contrast, three current representative algebraic reconstruction（ARTs） including basic ART, simultaneous ART （SART） and modified SART （MSART） were simulated simultaneously. The calculated results and reconstructive accuracy are discussed with three kinds of error indexes, namely mean-square error （MSE）, absolute value error （AVE） and peak error （PE）. As the results, the indexes of reconstructive accuracy are much improved by the proposed SSART. The MSE and PE have been decreased by 63.6% on the order of magnitude 10-4 and 88.9% on the order of magnitude 0-2,respectively,compared to that of ART. It is concluded that SSART is one of the most super iterative reconstructing techniques. 相似文献
20.
YANG Pei XU Bin-shi WU Lin 《光电子快报》2006,2(3):175-178
Withthe development of electronics ,i mage processingand computer techniques ,structured light 3D vision in-spection has gained wide acceptance.It is due tofast ac-quisition,very si mple optical arrangement ,low cost ,large field of viewandits robust natu… 相似文献