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 12 of 12 for “"radial distortion"”.
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Prediction and control of residual stresses and distortion in HY-130 thick pipe weldments
… scan micrographs. Temperature, strain, and radial distortion are measured at various locations or the HY-130 cylinder and the measured values are compared in tabular and graphic form with those values predicted by use of the heat flow and stress analysis programs. Excellent agreement is …
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Active control of rotating stall in a transonic compressor stage with inlet distortion
… transonic axial flow compressor with inlet distortion using active feedback control. The experiments were conducted at the NASA Lewis Research Center on a single-stage transonic core compressor. An annular array of 12 jet-injectors located upstream of the rotor tip was used for forced …
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Analytical camera pose estimation and inverse modelling of high order radial lens distortion polynomials for close range photogrammetry
… methods proposed to compute inverses of radial distortion coefficients in order to correct radial distortions were found not suitable for high-degree radial distortion polynomials and failed to model the inverse profiles of severe barrel, pincushio n, and moustache distortions inherent to …
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Generic camera calibration for omnifocus imaging, depth estimation and a train monitoring system
… by ideal perspective projection with small distortions due to lens shape (radial distortion) or misaligned lens-sensor configuration (decentering). In the first calibration method, we generalize pupil-centric imaging model to handle arbitrarily rotated lens-sensor configuration, where we …
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Robust Video Object Tracking via Camera Self-calibration
… for joint camera self-calibration and automatic radial distortion correction based on tracking of walking persons is designed to convert multiple object tracking into 3D space. (2) An adaptive model that learns online a relatively long-term appearance change of each target is proposed for robust …
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Real-Time Implementation of Vision Algorithm for Control, Stabilization, and Target Tracking for a Hovering Micro-UAV
… homography, color segmentation, radial distortion correction, and an extended Kalman filter with a standard-deviation outlier rejection technique (SORT). This implementation was designed specifically for use as an on-board vision solution in determining movement of small unmanned …
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3-D flow calculations of a bifurcated 2D supersonic engine inlet at takeoff
… of the study was to obtain the causes of flow distortion at the inlet fan face. The inlet was modeled with the centerbody in the fully collapsed takeoff position. A single block, 14Ox40x40 Polar grid topology of a 1/4 symmetry volume of the inlet was used in the simulation. The calculation …
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Numerical and experimental investigation of VG flow control for a low-boom inlet
… VGs were investigated to reduce boundary layer radial distortion at the AIP. To guide large-scale inlet experiments, Reynolds-Averaged Navier-Stokes (RANS) simulations using three-dimensional, structured, chimera (overset) grids and the WIND-US code were conducted. Flow control cases included …
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Mathematical Methods for Image Based Localization
… cameras to uncalibrated cameras with unknown radial distortion. The fifth paper of the thesis also treats the pose problem, but the method differs from the previous papers. In this paper a method is presented that guarantees a globally optimal solution at the price of computational complexity. …
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Automated tracking of swimmers in the clean swimming phase of a race
… calibration procedure was used to account for radial distortion. The Root Mean Square Error (RMSE) of reconstructed distances for a wide field of view was 16 x 10-3 m. This compared favourably with a three camera system reported in the literature, which had an RMSE of 46 x 10-3 m. In addition, …
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Kamerakalibrierung mit radialer Verzeichnung – die radiale essentielle Matrix
… Arbeit wird gezeigt, dass bei polynomialer radialer Verzeichnung die Parameter der Projektionsabbildung die Verzeichnungsparameter bestimmen. Dieses theoretische Ergebnis fließt in Algorithmen zur Kamerakalibrierung, d.h. zur Bestimmung der Parameter eines Kameramodells, ein. Diese wurden …
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Installation Effects on Variable Pitch Fans
… This thesis aims to study the effects of inlet distortion on variable pitch fan performance in reverse thrust operation, to find the most influential distortion components and to determine the way to operate a variable pitch fan with inlet distortion. Steady RANS and rig measurements are used in …