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 6 of 6 for “"inverse filter"”.
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Interferometric light microscopy for wafer defect inspection and three-dimensional object reconstruction
… light modulator (SLM) to make a dark-field filter to selectively filter the image, such that we maintain the defect signal and suppress the wafer’s underlying structure. Therefore, after increasing the power of the incident light, the CCD (charge-coupled device) camera’s full dynamic range …
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Improving ultrasonic imaging using novel coded excitation techniques
… First, it was hypothesized that a Wiener filter could adversely affect the compression performance of coded excitation because it had the potential to boost the harmonics due to nonlinear distortion. When the Wiener filter operated near an inverse filter the harmonics were boosted, …
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Enhancing and Reconstructing Digitized Handwriting
… in the first part of this thesis. Then nonlinear filters, structural techniques, and enhancement techniques are applied to obtain substantial improvements in image quality.
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Development of a Virtual Acoustic Showroom for Simulating Listening Environments and Audio Speakers
… method, and simulating speaker responses using inverse filtering. The image source method is used to simulate realistic living environments by filtering the environment impulse response by frequency-dependant absorption coefficients of typical building materials. Psychoacoustic tests show that …
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Deep structure ultrasound imaging using fundamental and third harmonic coded excitation techniques
… the signal-to-noise ratio (SNR) before Wiener filtering the REC chirp. The improved SNR forced the Wiener filter to act more like an inverse filter during compression and resulted in improved axial resolution. To test improvement, four experiments were conducted using conventional pulsing, 1, 3 …
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Bilinear inverse problems with sparsity: Optimal identifiability conditions and efficient recovery
Bilinear inverse problems (BIPs), the resolution of two vectors given their image under a bilinear mapping, arise in many applications. Without further constraints, BIPs are usually ill-posed. In practice, parsimonious structures of natural signals (e.g., subspace or sparsity) are exploited. …