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 43 for “"Motion compensation"”.
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Motion Compensation of Interferometric Synthetic Aperture Radar
… is an investigation into the improvement of the motion compensation algorithm created for the BYU inteferometric synthetic aperture radar, YINSAR. The existing BYU SAR processing algorithm produces improved radar imagery but does not fully account for variations in attitude (roll, pitch, yaw) and …
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Construction and control of motion compensation system
… This project concerns the construction of a motion compensation device to augment the video capabilities of casual hardware. It combines facial recognition and tracking, control algorithms, and linear actuation to enable a screen or other object to adapt real-time to the user's head motion. …
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Contour motion compensation for image sequence coding
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Multiparametric cardiac magnetic resonance imaging with motion compensation
… challenging because of cardiac and respiratory motion. In this thesis, a multiparametric magnetic resonance imaging technique was developed to increase the efficiency of data acquisition. Using this approach, accurate T1 maps and functional images were obtained simultaneously without …
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Approaches for respiratory motion compensation in positron emission tomography imaging
Respiratory patient motion often causes image blur and inaccurate quantitation results in positron emission tomography (PET) imaging. Traditional gated acquisition approach corrects motion artifacts by generating a snapshot sequence. Each snapshot, however, is of poor image quality due to …
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Motion compensation from limited data for reference-constrained image reconstruction
… different contrast and can be used with various motion models. It also makes use of all the available data to estimate the motion parameters. We propose practical algorithms to solve the optimization problems associated with motion parameter estimation. We also analyze the characteristics and …
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Event-Driven Motion Compensation in Positron Emission Tomography: Development of a Clinically Applicable Method
… patient over a certain time. Therefore, patient motion increasingly limits the possible spatial resolution of PET. In addition, patient immobilisations are only of limited benefit in this context. Thus, patient motion leads to a relevant resolution degradation and incorrect quantification of …
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Analysis of one-dimensional transforms in coding motion compensation prediction residuals for video applications
In video coding, motion compensation prediction provides significant increases in overall compression efficiency. The prediction residuals are typically treated as images and compressed by applying two-dimensional transforms such as the two-dimensional discrete cosine transform (2D-DCT). Previous …
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Translation and rotational motion compensation techniques for Inverse Synthetic Aperture Radar (ISAR) Imaging of sea vessels
This dissertation covers range alignment, autofocus, and time window length optimisation for ISAR imaging of sea vessels. The rationale behind the study was to review the range alignment, autofocus, and time window length optimisation techniques found in the literature and to assess the strengths …
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An examination of block motion compensation algorithms for MPEG-2 and prediction of bit rates from video sequence measurements
… the following two problems: • Finding a block motion compensation algorithm which is optimum in performance and speed. • Predicting the performance, for complex sequences, of an MPEG-2 encoder. An optimum motion compensation algorithm can lead to optimum temporal compression. For fixed bit-rate …
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High Resolution ISAR Imaging using a low-cost ultrasonic radar
… is a challenging task that requires advanced motion compensation algorithms to eliminate the blurring induced by the target's motion. However, the high cost of investigating different ISAR algorithms using real-life radars presents a significant challenge. To overcome this challenge, low-cost …
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Algorithms, architectures and circuits for low power HEVC codecs
… codecs. Our work focused on two specific areas: Motion Compensation Bandwidth and Intra Estimation. HEVC uses larger filters for motion compensation leading to a significant increase in decoder bandwidth. We present a novel motion compensation cache that reduces external memory bandwidth by 67% …
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Target localization in MRI-guided prostate biopsy
… often inaccurate due to intra-operative prostate motion and the lack of motion compensation techniques. As a result, malignant tumors can be missed, which in turn will lead to an increased number of repeated biopsies and delaying of treatment. To increase the needle targeting accuracy, …
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Antenna boresight calibration using optimal estimation techniques
… has been developing a Synthetic Aperture Radar Motion Compensation System (SARMCS). The SARMCS processes accelerometer and gyro measurements from an inertial measurement unit (IMU) to estimate and compensate for radar antenna motion. Uncompensated azimuth misalignment of the antenna boresight …
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Improved 2D Camera-Based Multi-Object Tracking for Autonomous Vehicles
… like cameras are not static, which can cause motion blur in the frames and make tracking inefficient. 2) Traditional methods for motion compensation, such as those used in Kalman Filter-based Multi-Object Tracking, require extensive parameter tuning to match features between consecutive frames …
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A low power video compression chip for portable applications
… The above results do not include the use of motion compensation, however, hooks are implemented at the algorithmic and architectural levels to add motion compensation at the cost of power dissipation a few times higher. These results are obtained by the careful coordination of design in a …
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Uncertainty analysis of acoustic flow measuring instruments for characterization of high energetic river flow
… to recorded data. A MATLAB code is developed for motion compensation and data filtering. The methodology adopted is to perform acoustic measurements in a controlled laboratory setting and in an energetic river test site at Reynolds number from 0.05x10^7 to 3x10^7. As the performance of …
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Real-time Temperature Imaging Using Ultrasonic Change in Backscattered Energy
… in real time, which is limited by time for motion compensation (MC).</p> <p>To achieve real-time TI, we implemented a two-computer architecture. Our Terason 3000 ultrasonic imaging system collected and sent raw images over a jtcp connection to a TI computer with a GeForce GTX 770 GPU card. …
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A Framework for Temperature Imaging using the Change in Backscattered Ultrasonic Signals
… accuracy. Non-thermal effects of noise and motion confound the use of CBE. Assuming additive white Gaussian noise, we applied signal averaging and thresholding to reduce noise effects. Our motion compensation algorithms were also applied to images with known motion to evaluate factors …
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Range-doppler synthetic aperture radar processing at VHF frequencies
… operation in the range-Doppler domain. Airborne motion compensation strategies for flight path reconstruction are discussed. In addition, an ERIM-developed approach for efficiently including an azimuth dependence for wide beam motion compensation is discussed in the context of the SASAR system. …
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