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 20 of 20 for “"scanning systems"”.
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Reconstructing the Atomic Number of Cargo X-ray Images using Dual Energy Radiography
… the risk of nuclear smuggling, the U.S. deploys scanning systems at ports of entry. Radiation portal monitors are capable of identifying unshielded nuclear or radiological threats by detecting radiation that is passively being emitted from a container. Radiography systems offer complementary …
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A Usability Study of Nomon: A Flexible Interface for Single-Switch Users
… These switches are commonly used as input to scanning systems that allow selection from a 2D grid of options. Nomon is an alternative interface that provides a more flexible layout, not confined to a grid. Previous work suggests that, even when options appear in a grid, Nomon may be faster and …
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A high speed scanning system for vision based navigation/control of mobile robots.
… of creating smart integrated information systems. These systems may include different type of sensors. Usually a CeD vision system is a necessary part for these systems. This thesis considers the design of a fast mechanical scanning system for a CCD vision system and the synthesis of the …
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Multimodal Imaging Documentation in Dental Medicine // Мултимодално образно документиране в денталната медицина
… and have evolved significantly from the first systems to the ones available today. However, there is still a need for studies regarding their accuracy and reliability in different clinical situations despite the encouraging results and advantages of our work with them. Technological progress …
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Three-Dimensional Ultrasound Imaging For Blood Flow Assessment In First Carpometacarpal Osteoarthritis
… increased temperature, which informed future scanning with the 3D US system. Eighteen CMC1 OA patients had 3D US scans with blood flow detection and visualization of the thumb repeated twice to assess test-retest reliability. 3D joint blood flow volumes were determined from the 3D US images. …
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Multiple reflector scanning antennas
Narrow beamwidth antenna systems are important to remote sensing applications and point-to-point communication systems. In many applications the main beam of the antenna radiation pattern must be scannable over a region of space. Scanning by mechanically skewing the entire antenna assembly is …
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Development of high-speed two-photon microscopy for biological and medical applications
… is HSTPM based on polygonal mirror scanner. The scanning speed reaches 13 frames/s for typical tissues using a polygonal mirror scanner. This system is based on single-focus scanning and single-pixel signal collection. The usage of higher input power is required to compensate for the signal …
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Multisensor modeling underwater with uncertain information
… stochastic models for intelligent systems exploring an underwater environment. The important characteristics shared by such applications are: real-time constraints: unstructured, three-dimensional terrain; high-bandwidth sensors providing redundant, overlapping coverage; lack of …
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Extended Depth-of-focus in a Laser Scanning System Employing a Synthesized Difference-of-Gaussians Pupil
Traditional laser scanning systems, such as those used for microscopy, typically image objects of finite thickness. If the depth-of-focus of such systems is low, as is the case when a simple clear pupil is used, the object must be very thin or the image will be distorted. Several methods have been …
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Quantifying Coordinate Uncertainty Fields in Coupled Spatial Measurement systems
Spatial coordinate measurement systems play an important role in manufacturing and certification processes. There are many types of coordinate measurement systems including electronic theodolite networks, total station systems, video photogrammetry systems, laser tracking systems, laser scanning …
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ADVANCED CMOS SINGLE-PHOTON IMAGER ARCHITECTURES FOR QUANTUM AND SCIENTIFIC IMAGING APPLICATIONS
… times by over 10× compared to traditional scanning systems. Second, a hardware-friendly on-chip compression scheme is developed for high-speed imaging. Leveraging temporal and spatial redundancies through a shot-noise-based Differential Pulse Code Modulation (DPCM) technique and …
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Automated ultrasonic inspection of heat exchanger tubesheets welds
… of this research was to design an automated scanning and signal interpretation system for ensuring the integrity of the welds in a specific heat exchanger presently used in industry. The First Effect Steam Chest is a shell and tube, one pass type of heat exchanger used in the production of …
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Voice Authenticationa Study Of Polynomial Representation Of Speech Signals
… and processing time than do fingerprint or iris scanning systems. Also, voice authentication research has yet to provide an authentication system as reliable as the other biometric measures. Most voice recognition systems use Hidden Markov Models (HMMs) as their basic probabilistic framework. …
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A precision laser scanning system for experimental modal analysis: its test and calibration
… and experimental modal analysis. A laser scanning system that provides position accuracy, speed, and flexibility plays a key role in this technique. This thesis gives an overview of various laser scanning techniques and the requirements of a laser scanning system for the LDV and modal …
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Feature extraction for range image interpretation using local topology statistics
… extraction have advanced greatly, for example, systems such as Scale Invariant Feature Transform (SIFT) can detect and describe the local features in the 2D images effectively. With the aid of rapidly advancing three-dimensional (3D) imaging technology, in particular, the advent of commercially …
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Adaptive Processing of Laser Scanning Data and Texturing of the Segmentation Outcome
Over the past few years, laser scanning systems (airborne, static terrestrial, and mobile terrestrial systems) have been acknowledged as the leading tools for the collection of high density 3D point clouds over physical surfaces for many different applications (3D city modelling, transportation …
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Effective and Efficient Non-Destructive Testing of Large and Complex Shaped Aircraft Structures
… and has developed methods for assessing NDT systems capabilities by noise analysis, excitation performance and error contributions attributed to the positioning of sensors. The work has resulted in 1. The demonstration that positional accuracy when ultrasonic testing has a significant effect …
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Multi-wavelength, multi-beam, photonic based sensor for object discrimination and positioning
… towards the development of advanced laser scanning systems for discrimination in perimeter security, defence, agriculture, transportation, surveying and geosciences. Military forces, in particular, have already started employing laser scanning technologies for projectile guidance, …