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Description: 随着微加工技术的发展和日益成熟 ,微型化光谱仪的研究得以快速发展。和传统的
微型光谱仪相比 ,基于调制原理的光谱仪具有高光通量、 高分辨率的性能优势 ,可广泛应用于生物、化学、 医学等许多领域中对微弱辐射信号的探测。介绍了几种类型的调制光谱仪的结构特点和关键技术 ,分析了设计与制作微型调制光谱仪过程中存在的一些关键问题与难点 ,并总结了该领域的研究进展和发展趋势。- The mat uration of the optical micro2elect ro mechanical systems technology has
imp ul sed t he development of t he micro spect rometer . Compared to the t raditional micro
spect rometer , t he spect rometer based on modulation can be used in biological , chemical and
medical fields to detect t he faint signal s due to it s inherent advantages. An overview of t he
development s of t he micro spect rometer based on modulation is presented. The key p roblems in
designing and fabricating t he Fourier t ransform spect rometer ( F TS) are discussed , and t he
progresses made worldwide in t his field are al so presented.
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Size: 467968 |
Author: drawsalt |
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Description: 极点、 极线是射影几何中一个极其重要的概念。建立在极点、 极线基础之上的立体视觉技
术又是计算机视觉中非常活跃的一个研究领域。利用图像坐标计算极点、 极线 ,当图像坐标很大
时 ,就会引起计算精度的下降 利用齐次坐标来计算极点、 极线 ,相应地增加计算量。本文从实际计
算的角度出发,使用 N矢量来表示视平面上的点和直线,由二次曲线极点、 极线的定义给出了极点、
极线的 N矢量计算公式。 在此基础上,给出了正交准则的 N矢量判定公式。通过举例分析和实验验
证 ,该算法实用、 可靠。-Poles and polar lines are the most i mportant concep ts in p r ojective geometry . The computati on by using
i mage coordinateswill cause deteri orati on of accuracy when they become t oo large, and the computati on by using
homogeneous coordinates will increase computati on . N2 vect or computati onal for mulas of poles and polar lines de2
rived fr om conic definiti on are p roposed fr om the pers pective of computati onal p rocesses if all points and lines on the
i mage p lane are rep resented in terms ofN2 vect ors . The computati onalmethods of orthogonality criteri on are p resen2
ted on the basis of the abvoe for mulas . The results of examp les show that the algorithms in this paper are more p rac2
tical and reliable than traditi onal algorithms .
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Size: 312320 |
Author: xiaofang |
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Description: 例4：在sinc(t)信号中叠加噪声，分析对应频谱
fs=100 采样频率,必须大于两倍基带信号最高频率
ts=1/fs 采样时间间隔
T=2 时间窗大小
-
x=x+0.1*randn(1,N)
x=awgn(x,-10, measured )
figure
plot(t,x)
title( 时域信号图 )
xlabel( t /s )
y=fft(x,N)
figure
if mod(N,2)~=0
N=N-1
end
f=linspace(0,fs/2,N/2)
plot(f,abs(y(1:N/2))*2/N)
title( 叠加噪声的sinc(t)信号频谱 )
xlabel( f /Hz )
figure
y0=y(1:N/2)
P=y0.*conj(y0)/N
P=10*log10(P)
plot(f,P)
title( 功率谱 )
xlabel( f /Hz )
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Size: 1024 |
Author: 张红 |
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Description: tError Con trol Approach of Random L inear Network Coding.A im ing at random linear netwo rk coding, th is paper p ropo ses an er ro r cont ro l method w h ich combines po int2 po int
check ing er ro r and end2 end ret ransm ission . By vir tue of the robustness of random linear netwo rk coding, th is method adop ts
th ree dimensional par ity check ing code to imp lement po int2 po int check ing er ro r, and let er roneous packets no t take par t in cod2
ing . W hen a sink node can no t decode the info rmat ion com ing f rom source node, it t ransm its feedback info rmat ion to source
node to request ret ransm ission . Theo ret ical analysis and simulat ion results show that, by using larger Galo is f ield and larger
packet, the p ropo sed method has h igh p robability to elim inate t ransm ission er ro r including global netwo rk coding ver texes er2
ro r, and make sink nodes integrally receive info rmat ion f rom source node at low er ret ransm ission rate .
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Size: 201728 |
Author: sunwei |
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Description: 通过引入特征点和改进最近点迭代法, 提出了一种
在三维扫描系统中对三维点云数据进行配准的方法。该方法
通过对特征点的提取, 首先得到一组匹配点对, 然后运用
SVD 矩阵分解算法求出转换参数R 和T, 进而以此作为最
近点迭代法的初始值, 并对最近点的求法和迭代截止条件作
了改进, 得到了很好的配准效果。该文论述了该方法的基本
原理, 并通过不同视觉下物体三维测量点云数据配准的应用
实例证明了该方法的有效性。-A 3-D meas uring dat a r egis trat ion method for 3-D
scann ing syst em was developed based on feature point s an d it erat ive
closet point ( ICP) algorithm. T he feature p oin ts are firs t ident ified
an d mat ched. T hen, the rot at ion mat rix R an d the t rans lat ion vector
T are fou nd usin g the s ingul ar value decomposit ion algorithm.
T hus, init ialized b y the former resul t , the ICP algorithm then leads
to a perfect regis t rat ion aft er improving on fin ding clos et d ist an ce
an d d ecid ing wh en to terminat e th e iterations . T he basic principle of
this method is discuss ed, and a regist rat ion applicat ion example of
3-D meas uring data taken from differen t viewpoint s is carried out to
sh ow the perfect feasibil ity of this approach
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Size: 155648 |
Author: jack |
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Description: UMTS Networks and Beyond
This a book onMobi le Communi cation Netw orks, in p articular the Univers al Mobi le
Teleco mmunica tion Sy stem (UMTS) and its successor technol ogies. UM TS is the
successor of GSM, and is expected to b ecome one of the world’s mos t com mon mobi le
telec ommunicat ion techn ologies.-UMTS Networks and Beyond
This is a book onMobi le Communi cation Netw orks, in p articular the Univers al Mobi le
Teleco mmunica tion Sy stem (UMTS) and its successor technol ogies. UM TS is the
successor of GSM, and is expected to b ecome one of the world’s mos t com mon mobi le
telec ommunicat ion techn ologies.
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Size: 3158016 |
Author: Sherra |
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Description: CREATE YOUR WEBSITE IN 30MIN!!!
This a book onMobi le Communi cation Netw orks, in p articular the Univers al Mobi le
Teleco mmunica tion Sy stem (UMTS) and its successor technol ogies. UM TS is the
successor of GSM, and is expected to b ecome one of the world’s mos t com mon mobi le
telec ommunicat ion techn ologies.-CREATE YOUR WEBSITE IN 30MIN!!!
This is a book onMobi le Communi cation Netw orks, in p articular the Univers al Mobi le
Teleco mmunica tion Sy stem (UMTS) and its successor technol ogies. UM TS is the
successor of GSM, and is expected to b ecome one of the world’s mos t com mon mobi le
telec ommunicat ion techn ologies.
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Size: 3052544 |
Author: Sherra |
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Description: 应用多权值神经网络方法对静态手势进行识别, 对手势字母图像采用傅里叶描述子提取特征信息, 取低频信息成分构建成犯维特征向量, 并应用多权值神经网络的算法, 构建各类的神经元网络-W ith th e develo Pm en t of hu m an eom p uter intera etion te ehn olo盯, th e
h as been
b ased on
an im P o rt a n t tas k fo r
U r o n s
diseu ssion . Th is Pap er pro Posed a new m eth o d fo r
re searc h of un ders tan ding fo r hu m an 5 gestu re
re eogn izing of han d al Ph ab et gesture s, w hieh
m ulti 一we ig hted ne
al 即rith m of m ulti一w eigh ted n e U r o n S
Th e
5 fo r
m eth od ap plied Fo uri er一d eseri Ptors fo r fe atu re extra etion an d eolb ined wi th the elassifi eation
re eognizin g , th e re sul ts sh ow ed th at th e m eth od p erfo rm ed w el .
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Size: 576512 |
Author: 流星 |
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Description: tsfriend tool run on linux
About
this is a linux version of tsfriend. for edit SI/PSI and other ts information.
windows version: http://code.google.com/p/tsfriend/
difference with windows version:
without multi thread feature.
without mpeg2 video decode feature.
without UI extend tree feature.
use xml file format to replace private file format for format file and content file.
use expat to parse xml file.
how to use:
download the source code by SVN.
make install.
try tsf command.
when you want to parse and edit your private format, or you think my parse is not correct.
add your own format
edit your own format file refer to format file in /main/format/ .
place it to /main/format .
edit /main/format/format to include your own format file.
make install.
Note,
integrate expat-2.0.1 from http://sourceforge.net/projects/expat
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Size: 344064 |
Author: soup |
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Description: 为了能有效解决H ough 变换的计算量大的问题，文中提出了一种基于直线局部结构特征的H ough 变换改进的直
线检测算法。该算法根据F reem an 准则分析了直线上基元的特征信息，通过图像上邻近的同类基元的倾斜角约束基元上
像素点的极角范围，减少每个点的计算次数，在保持精度的同时，提高直线检测的速度，在有噪声的情况下，该算法相对标
准H ough 变换算法可以提高到6 到7 倍。
-In o rder to effectively solve the pro blem of decreasing com putation in the process of using H ough T ransform (w r ) to extract
str aigh t line ．an im p ro v ed H T algo ri th m m etho d is p res en ted b ased O n-th e loc al ch aracteri stics o f the straig h t lin e ．A cc ord ing to F ree m a n
C ri te ria ，th e im p rov ed m eth o d an a lyzes e lem en tary line seg m e n ts s tru ctu re o f th e stra ig h t lin e ，an d d efine s th e sco p e of t3o lar an g le o f th e
points on elem entary line segm ents by com putin g the tilt ang le of the straight line d eterm ined by the tw o adjacent an d cong eneri c elem en —
tary sin e seg m en ts ，an d th en d ec rea se s th e c om p uting tim es o f ev ery po in t ．P o in ting to th e im a g e co n tain ing n o ise ，th e tes ting da ta sh o w s
th a t v elo c ity o f th e im p ro v ed a lg o rithm is 6- 7 tim es as fas t aS th e stan d ~ d o n e ，w h ile th e prec ision is k e p t．
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Size: 16848896 |
Author: zheng mingzhi |
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