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 74 for “"high dynamic range"”.
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High Dynamic Range and Omnifocus Imaging
This thesis also develops a new imaging model, which is more accurate than the conventional models (pinhole, thin-lens and Gaussian thick-lens). Our investigation of the standard models shows that the models make two implicit assumptions: first, that the aperture is coincident with the first …
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A high dynamic range capacitive displacement sensor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Development of High Speed High Dynamic Range Videography
High speed video has been a significant tool for unraveling the quantitative and qualitative assessment of phenomena that is too fast to readily observe. It was first used in 1852 by William Henry Fox Talbot to settle a dispute with reference to the synchronous position of a horse's hooves while …
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Companding techniques for high dynamic range audio CODEC receiver path
… the signal to noise ratio and improve the dynamic range of the audio CODEC Rx path by up to 18 dB. Further, two compensation techniques are analyzed in attempt to reduce the companding transients. The results show that transients in the output are reduced on average by 60% when using either …
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High dynamic range video merging, tone mapping, and real-time implementation
Although High Dynamic Range (High Dynamic Range (HDR)) imaging has been the subject of significant research over the past fifteen years, the goal of cinemaquality HDR video has not yet been achieved. This work references an optical method patented by Contrast Optical which is used to capture …
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Assessing High Dynamic Range Imagery Performance for Object Detection in Maritime Environments
… vessels. This study proposes the introduction of high dynamic range cameras on autonomous surface vessels because these cameras capture images at different levels of exposure revealing more detail than fixed exposure cameras. To see if this introduction will be beneficial for autonomous vessels …
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A Unified Framework for High-Frame-Rate High-Dynamic-Range Video Synthesis
Creating high-dynamic-range (HDR) video at high-frame rates is a technically demanding and application-critical problem, particularly in domains such as cinematography and autonomous perception. The challenge arises from the limitations of conventional image sensors in capturing both temporal and …
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Real-time Realistic Rendering And High Dynamic Range Image Display And Compression
… simulation is, by its very nature, an image of high dynamic range (HDR). This leads to the issues of the display of such images on conventional low dynamic range devices and the development of data compression algorithms to store and recover the corresponding large amounts of detail found in HDR …
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A High Dynamic Range CMOS Image Sensor with Adaptive Integration Time Control
… of the local integration time allows imaging of high dynamic range scenes without loss of information due to over- or underexposure. Depending on the size of the integrated memory, the proposed concept allows the specification of a freely movable image region within which the integration time is …
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Improving Photometric Camera Accuracy and Image Quality in High Dynamic Range Imaging
… with the challenge of capturing the vast range of light intensities present in the real world and reproducing them on a medium with much lower dynamic range. This challenge persisted from the era of print photography and continued with the adoption of standard dynamic range (SDR) displays, …
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Phase-locking terahertz quantum cascade lasers for high dynamic range heterodyne imaging
… of efficient terahertz detectors and convenient, high-powered terahertz sources. These factors combined with the strong atmospheric absorption of terahertz radiation necessitate the development of an imaging system capable of extracting small terahertz signals from the background noise. This can …
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Fixing it in the present - the decisive moment in high dynamic range landscape photography.
… landscapes can be challenging given the wide range of tonal values present in the scene that can extend beyond the range of what most digital cameras can record. Moving elements in the landscape such as clouds, foliage, water, and, changing light pose a challenge, as well as creative …
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Design of a High Dynamic Range CMOS Variable Gain Amplifier for Wireless Sensor Networks
… layout and testing results for a dB-linear, high dynamic gain range CMOS variable gain amplifier (VGA). The design adopts a new approximated exponential equation called the pseudo exponential equation to implement the dB-linear function. The proposed VGA is designed to have an extremely wide …
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Exploring the visualisation of the cervicothoracic junction in lateral spine radiography using high dynamic range techniques
… of a shoulder girdle phantom were subjected to high dynamic range (HDR) processing and tone mapping. A shoulder girdle phantom was constructed using Perspex, shoulder girdle and vertebral bones and water to reproduce the attenuation caused by soft tissue. The design allowed for the removal of …
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A bio-inspired, asynchronous, time-domain, multispectral imaging system for high dynamic range near-infrared fluorescence image-guided surgery
DSpace SAF Submission Ingestion Package generated from Vireo submission #13250 on 2019-02-08 at 11:41:37
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Investigation into the use of high-efficiency switched-mode class E power amplifiers for high-dynamic range pulse-mode applications
… to meet system sensitivity requirements. In high-dynamic range systems, the power amplifier pulse must turn off at a rate compatible with the system noise floor at the receive time. Some high-dynamic range systems are sensitive to signals greater than 120 dB below the transmit power level, …
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A Parallel Architecture for Analog-to-Digital Conversion with Improved Dynamic Range
… (ADCs) is developed to increase the system dynamic range. The proposed architecture is a critical component for a Continuous Wave Stepped Frequency (CWSF) radar system. Existing Commercial Off-The-Shelf (COTS) components are inadequate to meet the demands of a high sample rate and a high …
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A robust patch-based synthesis framework for combining inconsistent images
… come from far view points, or capture dynamic scenes with motions. In this thesis, we propose a patch-based synthesis algorithm to plausibly combine different images that have color, texture, structural, and geometric inconsistencies. For some applications such as cloning and stitching …
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Image enhancement methods and applications in computational photography
… data. Good examples of these innovations include high dynamic range imaging, focus stacking, super-resolution, motion deblurring and so on. Although extensive work has been done to explore image enhancement techniques in each subfield of computational photography, attention has seldom been given …
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