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 49 for “"feature points"”.
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Vision-Aided Navigation for Autonomous Vehicles Using Tracked Feature Points
… and testing of several navigation algorithms and feature extraction algorithms using an inertial measurement unit (IMU) and an image capture device (camera) mounted on a ground robot and a quadrotor UAV. The vision-aided navigation algorithms are implemented on data-collected from sensors on an …
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Development of obstacle detection and avoidance system based on integration of different based-sensor for small-sized unmanned aerial vehicle using cues from expansion of feature points and direction of flow field vectors
… and avoidance system. Cues from expansion of the features points are used to extract the depth information of the environment and classify the region in the predictable obstacle appearance situation. In the unpredictable obstacle appearance situation, the detection of the obstacle is done by …
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AUTOMATIC DETECTION OF FACIAL FEATURES FOR 3D MODEL BASED CODING APPLICATIONS
… presents an automatic detection scheme of facial features for 30 model based coding applications. This system can be used as a pre-requirement of a remote teaching application using 3D model based coding. A selected set of control points of the face is transmitted to the remote terminal instead of …
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Identifying Robust SIFT Features for Improved Image Alignment
… thesis, we will study different ways to improve feature matching by increasing the quality and reducing the number of SIFT features. We created an algorithm to identify robust SIFT features by evaluating how invariant individual feature points are to changes in scale. This allows us to exclude …
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Feature guided pixel matching and segmentation in motion image sequences
The problem of feature correspondences and trajectory finding for a long image sequence has received considerable attention. In this research, a coarse-to-fine algorithm is developed to obtain pixel trajectories through the sequence and to segment them into subsets corresponding to objects moving …
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Small UAV Trajcetory Prediction and Avoidance using Monocular Computer Vision
… A computer vision algorithm locates specific feature points of a threat aircraft in an image and the POSIT algorithm uses these feature points to estimate the pose (position and attitude) of the threat. A sequence of pose estimates is then used to predict the trajectory of the threat aircraft …
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Homography-Based State Estimation for Autonomous Exploration in Unknown Environments
… are based on tracked Speeded-Up Robust Features (SURF) points and the homography relationship that relates the camera motion to the locations of tracked planar feature points in the image plane. An extended Kalman filter implementation is developed to perform sensor fusion using …
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A parking assistant system
… an image sequence involves several steps. First, feature points are extracted in each image using a Curvature Scale Space (CSS) based corner detector. Corresponding feature points are then matched between consecutive frames and tracked through the entire sequence. Using the motion parameters of …
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Registration of Arbitrary 3D Point Cloud Using Statistical Head Model
… seeks to automate the process by using Harr-like features to detect feature points required for the initial alignment.
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An Evaluation of an Omni- Directional (Fisheye) Vision Sensor for Estimating the Pose of an Object,
… event is developed to extract four non-coplanar feature points from remapped images of the target object. The image coordinates of the feature points are passed to a Pose from Orthography and Scaling with Iteration (POSIT) algorithm, to measure the objects pose in relation to the omni-directional …
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A Novel Multistage Image Registration Technique with Graph-based Region Descriptors
… and textural characteristics of invariant feature points. Clusters of invariant feature points are shown to provide more discriminative features than the traditional point descriptors.</p> <p>The multistage method is a hierarchy of registration approaches that takes advantage of feature, …
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Utilising the grid for augmented reality
… using computer vision techniques. Repeatable feature points are extracted from the users view point to build a description of the object or plane that the virtual artifact is aligned with. Then as each frame is updated we use the changing position of the feature points to estimate how the …
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Distortion Correction for Non-Planar Deformable Projection Displays through Homography Shaping and Projected Image Warping
… process involves (i) detecting feature points from the camera images and creating a desired shape of the undistorted view through a 2D homography, (ii) transforming the feature points on the camera images to control points on the projected images, (iii) calculating Radial Basis …
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Shape Analysis Using Spectral Geometry
… we discuss in detail about the salient geometric feature points in the Laplace-Beltrami spectral domain instead of traditional spatial domains. Simultaneously, the local shape descriptor of a feature point is the Laplace-Beltrami spectrum of the spatial region associated to the point, which are …
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Face Recognition and Expression Recognition using Morphable Models
… WELL AS THE DISTANCE BETWEEN CORRESPONDING FACE FEATURES ON DIFFERENT FACES (LOCAL ENERGY). LOCALIZED FACE FEATURE POINTS SUCH AS EYE CENTERS, NOSE-TIP, MOUTH AND ETC ARE DETECTED AND HENCE THE FEATURES CAN BE USED TO CONSTRAIN THE MOVEMENT OF THE SURFACE DURING THE CONSTRUCTION OF THE MORPHABLE …
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Object Detection and Tracking Using Uncalibrated Cameras
… calibrating the camera, detecting the object's feature points over frames, tracking the object over frames and analyzing object's motion and behavior. The approach contains two stages. First, the problem of camera calibration using a calibration object is studied. This approach retrieves the …
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Monocular vision based navigation using image moments of polygonal features
… and mapping algorithm using moments of polygon features. The landmarks we use are polygonal regions instead of a dense set of feature points, which can significantly reduce the computational complexity of data association and produce a map that is geometrically and structurally more meaningful. …
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Human face modeling, analysis and synthesis
… model-based coding system. An automatic facial feature extraction algorithm is discussed in detail in this thesis. Based on template matching, the face area and the key points around each facial feature can be determined accurately on the front and side profile view face images. Then a realistic …
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Appearance based modeling and learning of the human face with application to biometrics
… that model facial appearance holistically, and feature-based approaches, which rely on the localization of facial feature points. In this dissertation we argue that appearance-based approaches are well suited for various face processing tasks. A fully automatic face processing system consists of …
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