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 15 of 15 for “"fiducial marker"”.
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An Implantable Mosfet Dosimeter Modified to Act As A Fiducial Marker
… the patient, it could serve a dual function as a fiducial marker for image guided radiation therapy (IGRT) treatment if it could be modified to be visible on x-rays. In this study, modifications to the MOSFET dosimeter were made to increase its visibility for IGRT treatment. To test whether the …
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Mapping and Localization Using LiDAR Fiducial Markers
… are essential for autonomous systems, yet LiDAR fiducial markers (LFMs) lag behind visual fiducial markers (VFMs) in adoption and utility. Bridging this gap is vital for robotics and computer vision but challenging due to the sparse, unstructured nature of 3D LiDAR data and 2D-focused fiducial …
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Motion Detection in Dynamic Cardiac Positron Emission Tomography Images
… images.First, we determined if positron-emitting fiducial markers can be used as surrogate markers for heart motion in dynamic PET images. Second, algorithms were developed to track fiducial marker motion. Lastly, we tested the idea that principle component analysis may be able to detect heart …
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Detection of dynamic obstacles out of the line of sight for autonomous vehicles to increase safety based on shadows
… a visual odometry method (i.e. DSO) with a fiducial marker system (i.e. AprilTags). The mean classification accuracy on simulated data is around 80% and on real-world corners approximately for both image registration methods 70%. Additionally, we integrate our detection system on a …
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Computer vision based navigation for spacecraft proximity operations
… based relative spacecraft navigation that uses a fiducial marker with the minimum number of known point correspondences. An experimental evaluation of this algorithm is presented that determines an upper bound on the accuracy and precision of this system. The third step towards vision based …
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Development of an augmented reality guided computer assisted orthopaedic surgery system
… camera tool-mounted trackingsystem based upon fiducial planar markers was implemented. The use ofvisible-spectrum cameras, as opposed to the infra-red cameras typically used bysurgical tracking systems, allowed the captured image to be streamed to a display inan intelligible fashion. The …
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A markerless augmented reality system using one-shot structured light
… and tracking can be done using a black and white fiducial marker (i.e., marker-based AR) or some known parameters about the scene (i.e., markerless AR) in order to triangulate corresponding points. To meet users’ needs and demand, range-finding, registration and tracking must follow certain …
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High-throughput characterisation and device integration of nanomaterials
… is introduced using a lithography-optimised fiducial marker system LithoTag, which is used for the identification of individual InAs nanowires and for automatically designing >200 devices with high alignment accuracy. The presented method provides the foundation for subsequent research …
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Scalable Full Posterior Inference for Uncertainty-Aware Robot Perception
… scenes. By employing this framework, we optimize fiducial marker placements in 3D environments, boosting localization rates by 20%.
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Visualisation and manipulation of 3D patient-specific bone geometry using augmented reality
… alignment to identified anatomical landmarks, fiducial marker tracking, and markerless tracking. For user calibration with anatomical landmarks, the MRTK was manipulated to allow alignment of the virtual object. For fiducial registration, the Vuforia Software Development Kit (SDK) was added to …
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Automated High-quality Image Acquisition for UAV-enabled Bridge Visual Inspection
… Stereo Visual Inertia Odometry (SVIO) and fiducial marker-based measurements. By periodically registering the local pose estimation into a global frame and correcting accumulated error by the SVIO, this method can provide robust global location estimation during long-distance flights under …
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Toward reliable localization: exploring infrared fiducial markers and multi-imu fusion as alternative sensor modalities
… two alternative sensor modalities: infrared fiducial markers and multi-IMU integration, as means to enhance localization robustness in GNSS- and vision-degraded settings. Vision-based navigation systems, which commonly rely on visible-spectrum cameras and fiducial markers (e.g., AprilTags or …
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Towards vision based robots for monitoring built environments
… with few distinct features. We introduce a new fiducial marker that can be added to these scenes to increase the number of distinct features and a new detection algorithm that detects the marker with negligible computational overhead. Adding markers prior to data collection does not guarantee …
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Adaptive Radiation Therapy Of Prostate Cancer
… labor involved. </p> <p>DIR was validated using fiducial marker position, visual comparison and UE. The mean and standard deviation of markers after rigid registration in L-R direction was 0 and 1 mm. But the mean was 2-4 mm in the A-P and S-I direction and standard deviation was about 2 mm. …
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Vision-based robust structural dynamic monitoring and modal identification using stationary and drone-based imaging systems.
… spatiotemporal information, utilizing fiducial markers as inexpensive virtual sensors to recover three-dimensional structural vibrations and to estimate modal parameters for full-field vision analysis without deploying stereo camera systems. To address accessibility challenges …