Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"high-pass filtering"”.
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Investigation of High-Pass Filtering for Edge Detection in Optical Scanning Holography
High-pass filtering has been shown to be a promising method for edge detection in optical scanning holography. By using a circular function as a pupil for the system, the radius of the circle can be varied to block out different ranges of frequencies. Implementing this system in simulation yields …
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Digital pulse interval modulation for indoor optical wireless communication systems
… interference from a fluorescent lamp driven by a high-frequency electronic ballast, which is potentially the most degrading source of ambient light. It is found that such interference results in an average optical power requirement that is almost independent of the bit rate. The analysis then goes …
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CMOS Readout Interfaces for MEMS Capacitive Microphones
… and 460uA of total current consumption; thus, highlighting the feasibility of low-power integrated MCM readout interface. This ASIC is also acoustically characterized with a MCM, bonded together in a single package, demonstrating a reasonable agreement with the expected performance. The second …
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A monitoring method for after-earthquake damage evaluation of buildings
… residual displacements and to cancel the need of high-pass filtering acceleration signals, I proposed a sensing bar prototype instrumented with accelerometers and inclinometers.
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Transition to turbulence and relaminarization of pulsatile pipe flows
… setup by using a continuous wave laser and a high-frame-rate digital camera. The position of the piston was continuously recorded by a laser proximity sensor. Different experiments were carried out with Reynolds numbers in the range of 535 4825 and Womersley numbers from 6.3 to 23.82. The …
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An experimental determination of the effects of image quality on eye movements and search for static and dynamic targets
… of the image presented was varied by either passing, low-pass filtering, or attenuating the video signal and by adding electrical white noise to the video signal. The results of this experiment indicate that (1) at the highest level of electrical noise added, the percent of correct target …
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Robust Statistical Radio Interferometric Methods for the Detection of the Epoch of Reionization
In 21 cm cosmology, we are seeking to detect the highly redshifted spin-flip line of HI to constrain the properties of the Epoch of Reionization and to better understand the astrophysical and cosmological processes of the early Universe. The sensitivity requirements for such a detection are …
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Diffraction phase microscopy for applications in materials science
… we have shown that such artifacts are due to a high-pass filtering phenomenon caused by a lack of spatial coherence. This realization allowed us to quantitatively model the phase reductions and halo effect, and remove them using a variety of techniques. The final DPM/wDPM system is capable of …