Robustnesstochangesinilluminationconditionsaswellas viewing perspectives is an important requirement formany computer vision applications. One of the key fac-ors in enhancing the robustness of dynamic scene analy-sis that of accurate and reliable means for shadow de-ection. Shadowdetectioniscriticalforcorrectobjectde-ection in image sequences. Many algorithms have beenproposed in the literature that deal with shadows. How-ever,acomparativeevaluationoftheexistingapproachesisstill lacking. In this paper, the full range of problems un-derlyingtheshadowdetectionareidenti?edanddiscussed.Weclassifytheproposedsolutionstothisproblemusingaaxonomyoffourmainclasses, calleddeterministicmodeland non-model based and statistical parametric and non-parametric. Novelquantitative(detectionanddiscrimina-ionaccuracy)andqualitativemetrics(sceneandobjectin-dependence,?exibilitytoshadowsituationsandrobustnesso noise) are proposed to evaluate these classes of algo-rithms on a benchmark suite of indoor and outdoor videosequences.
In this letter, the error performance of an ultra-wideband (UWB) system with a hybrid pulse amplitude and position modulation (PAPM) scheme over indoor lognormal fading channels is analyzed. In the PAPM UWB system, input data is modulated onto both the pulse amplitudes and pulse positions.
This paper presents a visual based localization
mechanism for a legged robot. Our proposal, fundamented
on a probabilistic approach, uses a precompiled topological
map where natural landmarks like doors or ceiling lights
are recognized by the robot using its on-board camera.
Experiments have been conducted using the AIBO Sony
robotic dog showing that it is able to deal with noisy sensors
like vision and to approximate world models representing
indoor ofce environments. The two major contributions of
this work are the use of this technique in legged robots, and
the use of an active camera as the main sensor
Wireless Fidelity (Wi-Fi) networks have become mainstream over the last few years. What
started out as cable replacement for static desktops in indoor networks has been extended
to fully mobile broadband applications involving moving vehicles, high-speed trains, and
even airplanes.
In cellular networks, it is estimated that
2
3
of calls and over 90% of data services occur
indoors. However, some surveys show that many households and businesses experience
a poor indoor coverage problem. It has been identified that poor coverage is the main
reason for churn, which is very costly for operators in saturated markets. How to provide
good indoor coverage cost effectively is thus a demanding challenge for operators.
Since the principle of multi-carrier code division multiple access (MC-CDMA) was
simultaneously proposed by Khaled Fazel et al. and Nathan Yee et al. at the IEEE
International Symposium on Personal, indoor and Mobile Radio Communications
(PIMRC) in the year 1993, multi-carrier spread spectrum (MC-SS) has rapidly become
one of the most wide spread independent research topics on the field of mobile radio
communications. Therefore, the International Workshop on Multi-Carrier Spread
Spectrum (MC-SS) was initiated in the year 1997. Multi-carrier and spread spectrum
systems with their generic air interface and adaptive technologies are considered as
potential candidates to fulfill the requirements of next generation mobile communications
systems.
The use of optical free-space emissions to provide indoor wireless commu-
nications has been studied extensively since the pioneering work of Gfeller
and Bapst in 1979 [1]. These studies have been invariably interdisciplinary in-
volving such far flung areas such as optics design? indoor propagation studies?
electronics design? communications systems design among others. The focus
of this text is on the design of communications systems for indoor wireless
optical channels. Signalling techniques developed for wired fibre optic net-
works are seldom efficient since they do not consider the bandwidth restricted
nature of the wireless optical channel.
文章提出了一種基于AT89S51單片機(jī)的智能家居系統(tǒng)的設(shè)計(jì),該系統(tǒng)具有室內(nèi)煤氣以及煙霧的檢測(cè)、家庭室內(nèi)防盜等功能。文章詳細(xì)分析了系統(tǒng)的總體設(shè)計(jì),詳盡分析并設(shè)計(jì)了煤氣傳感器模塊、煙霧傳感器模塊、人體紅外感應(yīng)傳感器模塊、報(bào)警模塊等各硬件部分,并利用PROTUES軟件進(jìn)行了系統(tǒng)仿真。仿真結(jié)果證明:系統(tǒng)具有成本低、效率高、操作方便等優(yōu)點(diǎn),達(dá)到了預(yù)期設(shè)計(jì)的效果。This paper presents the design of an intelligent home system based on AT89S51 microcontroller.The system has the functions of detecting indoor gas and smoke,guarding against theft in the home,and so on.The overall design of the system is analyzed in detail.The gas sensor module,smoke sensor module,human infrared sensor module,alarm module and other hardware parts are analyzed and designed in detail,and the system simulation is carried out using PROTUES software.The simulation results show that the system has the advantages of low cost,high efficiency,convenient operation and so on,and achieves the expected design effect.
如果在調(diào)諧器或電視機(jī)附近使用本機(jī)或任何其他使用微處理器的電子設(shè)備，則可能會(huì)產(chǎn)生圖像的噪聲或干擾。如果發(fā)生這種情況，請(qǐng)采取以下步驟將本機(jī)安裝在盡可能遠(yuǎn)離調(diào)諧器或T的地方。遠(yuǎn)離調(diào)諧器或T，遠(yuǎn)離本機(jī)的電源線和輸入/輸出連接電纜。尤其在使用室內(nèi)天線或300歐姆饋線。我們建議使用室外天線和75 Q / ohm同軸電纜Noise or disturbance of the picture may be generated if this unit or any other electronic equipment using microprocessors is used near a tuner or TV If this happens, take the following stepsInstall this unit as far away as possible from the tuner or T Run the antenna wires from the tuner or T away from this unit ' s power supply cord and input/output connection cables. Noise or disturbance tends to occur particularly when using indoor antennas or300 ohm feeder wires. We recommend using outdoor antennas and 75 Q/ohm coaxial cables
