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Video Restoration Based on Kalman FilteringHung, Shau-Pin 10 July 2001 (has links)
In this paper, we propose a Kalman filtering method to restore signal when both the digital and analog signal are available. The digital video signal is coded by method of MPEG. The error can be introduced in the quantization process of the block DCT transformation. So the quality of the image from the digital video signal needs to be improved. Considering the analog video signal is corrupted by the Gauss White Noise. We can apply the Kalman filter to these two signals at the same time to restore the image for a better quality.
The image structure is defined to be the linear relationship between pixels with their upper and left neighbors. So we can determinate the image structure property by the linear equations of the pixel gray level. Generally, the image segmentation takes the gray values as the property. In our case we take the linear equations as our property function. This property implies an abstract concept and can¡¦t measure directly. We determine the unity of the image structure by measuring the error from merging the pixel into one region. We achieve a recursive formula for computing the error by the sequential least square error method.
In the signal processing, Kalman filter is used for optimal estimation of the signal corrupted by additive noise. We segment the image by its local property. By our segmentation technique every region has its specific image structure. The structures are system parameters of Kalman filter.
We first utilize the method of segmentation on the image recovered from the MPEG signal to find the local parameters. The results of experiments show that we can improve the images quality when the MPEG signal is not very good.
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An HTML Filter on WAP GatewayChuang, Chih-Ching 18 July 2001 (has links)
none
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Full Wave Simulation of the Package of SAW FilterLin, Shin-Hung 07 July 2003 (has links)
Among communication filters, SAW Filters have been largely used in RF and IF filters of mobile phone because of their small size, high reliability, and the capability to be mass produced. But with increasing of working frequency and miniaturization of SAW package, SAW filters are more sensitive to interference introduced by the package and SAW Pattern. Discrepancy in performance between design and measurement can be large if the packaging effects are not considered.
In this thesis, we use the full wave analysis approach that combining full wave simulator HFSS (High Frequency Structure Simulator) with circuit software to simulate the package effects and the electromagnetic effects of SAW pattern. Our approach has been applied to several cases and measurements are also carried out to verify our results. Good agreements are obtained. We also use this method to discuss the electromagnetic effects inside package, such as the change of the bond wire length. With an accurate prediction, we can save factory design time and production cost.
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Electrooptic matched filter controlled by independent voltages applied to multiple sets of electrodesKim, Changdong 12 April 2006 (has links)
Analysis and experimental results on a polarization independent electrooptic
matched filter (EMF) with a center wavelength of 1.53 μm are reported. The EMF
utilizes electrooptic phase-matched TE↔TM conversion in a Ti-diffused waveguide on
a LiNbO3 substrate. The operation of the EMF to select an optical frequency channel is
controlled by applying independent voltages to interdigital electrode sets cascaded
along a single mode waveguide. The device is inherently polarization independent and
has the potential for submicrosecond tuning. The number of selectable channels N is
related to the number of electrode sets P by the formula / 2 1 N P = + . A matrix analysis
is used to determine the TE↔TM conversion efficiency for the case that 8 P = and
5 N = . A driving circuit for the EMF was implemented using a digital-to-analog
converter (DAC) array controlled from a personal computer (PC). Transmittance
spectra of a filter produced in a LiNbO3 substrate are presented. A raised cosine
weighting function applied along the 3.8 cm length of an EMF provides a sidelobe
suppression level better than Â17 dB with a 1.0 nm 3-dB bandwidth.
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Navigation solution for the Texas A&M autonomous ground vehicleOdom, Craig Allen 30 October 2006 (has links)
The need addressed in this thesis is to provide an Autonomous Ground Vehicle (AGV)
with accurate information regarding its position, velocity, and orientation. The system chosen to
meet these needs incorporates (1) a differential Global Positioning System, (2) an Inertial
Measurement Unit consisting of accelerometers and angular-rate sensors, and (3) a Kalman
Filter (KF) to fuse the sensor data. The obstacle avoidance software requires position and
orientation to build a global map of obstacles based on the returns of a scanning laser
rangefinder. The path control software requires position and velocity.
The development of the KF is the major contribution of this thesis. This technology can
either be purchased or developed, and, for educational and financial reasons, it was decided to
develop instead of purchasing the KF software. This thesis analyzes three different cases of
navigation: one-dimensional, two dimensional and three-dimensional (general). Each becomes
more complex, and separating them allows a three step progression to reach the general motion
solution.
Three tests were conducted at the Texas A&M University Riverside campus that
demonstrated the accuracy of the solution. Starting from a designated origin, the AGV traveled
along the runway and then returned to the same origin within 11 cm along the North axis, 19 cm
along the East axis and 8 cm along the Down axis. Also, the vehicle traveled along runway 35R
which runs North-South within 0.1ð, with the yaw solution consistently within 1ð of North or
South. The final test was mapping a box onto the origin of the global map, which requires
accurate linear and angular position estimates and a correct mapping transformation.
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Robotic localization of hostile networked radio sources with a directional antennaHu, Qiang 25 April 2007 (has links)
One of the distinguishing characteristics of hostile networked radio sources (e.g.,
enemy sensor network nodes), is that only physical layer information and limited
medium access control (MAC) layer information of the network is observable. We
propose a scheme to localize hostile networked radio sources based on the radio signal
strength and communication protocol pattern analysis using a mobile robot with a
directional antenna. We integrate a Particle Filter algorithm with a new sensing
model which is built on a directional antenna model and Carrier Sense Multiple
Access (CSMA)-based MAC protocol model. we model and analyze the channel
idle probability and busy collision probability as a function of the number of radio
sources in the CSMA protocol modeling. Based on the sensing model, we propose a
particle-filter-based scheme to simultaneously estimate the number and the positions
of networked radio sources. We provide a localization scheme based on the method
of steepest descent for the purpose of performance comparison. Simulation results
demonstrate that our proposed localization scheme has a better success rate than the
scheme based on the steepest descent at different tolerant distances.
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Impedance matching techniques for ethernet communication systemsKamprath, Richard Alan 17 September 2007 (has links)
In modern local area networks, the communication signals sent from one
computer to another across the lines of transmission are degraded because of reflection at
the receiver. This reflection can be characterized through the impedances of the
transmitter and the receiver, and is defined by the Institute of Electrical and Electronic
Engineers (IEEE) as the S11 return loss. The specifications for S11 return loss in Gigabit
Ethernet are given in terms of magnitude only in the IEEE 802.3 guidelines. This does
not fully take into account, however, the effects of frequency dependant impedances
within the bandwidth of interest. With a range of 30% error in the category 5, or CAT5,
transmission line impedance used in this specification and no further requirements for
individual components within the Gigabit Ethernet port, such as the RJ45 magjack or the
physical layer, the system can easily be out of tolerance for return loss error. A simple
impedance matching circuit could match the CAT5 cable to the physical layer such that
the return loss is minimized and the S21 transmission is maximized.
The first part of the project was commissioned by Dell Computer to characterize
the return loss of all of its platforms. This thesis goes further in the creation of a system
that can balance these two impedances so that the IEEE specification failure rate is
reduced with the lowest implementation cost, size, power and complexity. The return
loss data were used in the second phase of the project as the basis for component ranges
needed to balance the impedance seen at the front of the physical layer to the CAT5 transmission line. Using the ladder network theory, an impedance matching circuit was
created that significantly reduced the S11 return loss in the passband of the equivalent
ladder network. To manage this iterative process, a control loop was also designed.
While this system does not produce the accuracy that a programmable finite impulse
response (FIR) filter could, it does improve performance with relatively minimal cost,
power, area and complexity.
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A Log-Domain Filter Based On CMOS Pseudo-Exponential CircuitChang, Hsiu-Cheng 31 July 2008 (has links)
In this thesis, a CMOS tunable second-order log-domain filter using pseudo-exponential approximation is proposed. MOSFETs in the circuit are working in the saturation region. This filter has higher frequency response than that of weak inversion CMOS filter.
The circuit has been fabricated with 0.35um CMOS technology. It operates with a supply voltage 3V, internal capacitance C is 1pF, the biasing current varies from 2uA~10uA. The cutoff frequency can be turned from 2MHz~37.5MHz. The harmonic distortion is 0.93% and the power consumption is 772uW.
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Integrated filters for the on-chip silicon photonics platformFrank, Ian Ward 10 October 2014 (has links)
We investigate the properties of integrated dielectric filters for the purposes of on-chip routing of photons. We started with the use of high quality factor tunable photonic crystal nanobeam cavities and moving on to examine a new class of reflection based reverse designed filters that maintain the footprint of a waveguide while allowing for arbitrary amplitude and phase response. / Engineering and Applied Sciences
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Digital image processing using colour space transformationCook, Anthony John January 2000 (has links)
The purpose of the work is to explore the feasibility of devising a computer system that implements the desirable effects of a photographic filter and provides an environment for colour filter design for image processing. Using conversion from RGB to the CIELUV colour space a new method for the implementation of photographic filter as a digital filter is described. A filter is implemented by converting image pixel rgb values into CIELUV (u', v') and L* values and operates using the visual wavelength values provided by the (u', v') chromaticity diagram. However, the (u', v') diagram cannot provide wavelength values for pixels that correspond to (u', v') points in the `purple line' sector of the diagram. These pixels are allocated wavelengths by means of a new wavelengths scale that makes it possible for the filter to process any pixel in a digital image. Filter transmittance data for visual spectrum wavelengths is obtained from published tables. The transmittance data for purple sector pixels is provided by a colour model of the (u', v') chromaticity diagram. The system is evaluated by means of the Macbeth ColorChecker chart and the use of physical measurements. The extension of the CIELUV diagram with an equivalent wavelength scale provides a new environment for the enhancement and manipulation of digital colour images.
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