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 111 for “"edge detection"”.
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Robust Methods for Image Restoration and Edge Detection
In this thesis, three separate but related topics are considered. Each topic deals with the problem of noise in various aspects of image processing and computer vision.
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Investigation of High-Pass Filtering for Edge Detection in Optical Scanning Holography
… has been shown to be a promising method for edge detection in optical scanning holography. By using a circular function as a pupil for the system, the radius of the circle can be varied to block out different ranges of frequencies. Implementing this system in simulation yields an interesting …
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Drought in the Colorado River Basin: Spatiotemporal Analysis using an Edge Detection Filter
… of past climatic conditions. A one-dimensional edge detection filter was applied to standardized ring-width indices to identify years with rapid change in ring-width magnitude that may reflect changes in state. Both standardized indices and edge detection outputs were mapped to analyze how the …
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Detection of Tubes in Radiographs Using Canny Edge Detection and Progressive Hough Transforms
… detecting tubes that first uses a Canny edge detector for the initial identification of edges, followed by a windowed variant of the Hough transform, a common line detection algorithm, which is used to identify potential tube pixels. Our method employs repeated applications of a …
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Towards real-time high-resolution edge detection: A highly efficient FPGA implementation of the Canny algorithm
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-05-01
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Velocity measurement of laser energy induced Rayleigh surface waves on bulk substrates employing the optical beam deflection (knife-edge detection) method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Edge analysis of seasonal variability in chlorophyll maps of the Black Sea
… circulation features automatically through edge detection. In the Black Sea, the use of edge detection to identify fronts can be used to study the effects of river input on circulation patterns and biological and physical interactions. The use of edge detection on remotely sensed chlorophyll …
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Three-dimensional image reconstruction of skeletal tissue from computed tomography
Edge Detection Techniques play a very important role in medical imaging. Pre-operative diagnosis of diseases such as cancer, tumors, bone fractures etc. depend on edge detection techniques to identify the malignant growths. In orthopedics, edge detection techniques are used in the reconstruction of …
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Edges from image
To simulate the edge perception ability of human eyes and detect scene edges from an image, context information and world constraints must be employed in the edge detection process. To accomplish this, two Bayesian decision theoretic frameworks for context dependent edge detection are developed …
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Visually guided flight in birds using the budgerigar (Melopsittacus undulatus) as a model system
Keywords: Edge detection, Optic flow, Obstacle avoidance
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Visually guided flight in birds using the budgerigar (Melopsittacus undulatus) as a model system
Keywords: Edge detection, Optic flow, Obstacle avoidance
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Accumulator-based three dimensional building boundary reconstruction framework for satellite images
Three-Dimensional (3D) building boundary detection and reconstruction from satellite images has various applications in computer vision such as 3D city modelling, radio network planning, urban planning, mapping, and navigation. Traditionally, 3D building models have been produced from multiview …
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Exploring Spin-transfer-torque devices and memristors for logic and memory applications
… of memristive networks to perform image edge detection. First, we proposed a hardware-friendly algorithm for image edge detection based on ant colony. Next, we designed the image edge detection algorithm using memristive networks.</p>
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A study of using backpropagation and a new neural net algorithm for edge detecting in binary images
… processing stages : 1. detecting and extracting edges from the input image, 2. connecting the detected edges to form objects, 3. using information about the objects to construct and understand a scene. Edge detecting is an important processing stage. The intent of this research is to explore the …
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Automatic matching of features in Synthetic Aperture Radar data to digital map data.
… the image prior to matching. Structuring using edge detection and segmentation are investigated. Among operators for detecting edges in SAR an operator based on intensity ratios is identified as the most suitable. Its performance is fully analysed. Segmentation using an iterative edge …
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A unified scheme for image segmentation and object recognition
… recognition via three serial stages: (1) optimal edge detection and region detection; (2) scale, position and orientation invariant object detection; and (3) high-level knowledge-based image segmentation.
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Feature extraction via heat flow analogy
… low-level feature extraction<br/>techniques are edge detection, corner detection, thresholding as a point operation and optical flow estimation. On the other hand, high-level features give shape information, where the popular techniques are active contours, region growing, template matching and …
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3D ENDOSCOPY VIDEO GENERATED USING DEPTH INFERENCE: CONVERTING 2D TO 3D
… in-vivo images of the endoscopy image sequence. Edge detection is used to map these ridge-like structures into concentric ellipses with their common center at the darkest spot. Then, these two observations are used to infer the depth of the endoscopy videos; which then serves to convert them from …
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Event Detection in the Terrain Surface
Event Detection is a process of identifying terrain flatness from which localized events such as potholes in the terrain surface can be found and is an important tool in pavement health monitoring and vehicle performance inspection. Repeated detection of terrain surfaces over an extended period of …
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AUTOMATIC DETECTION OF FACIAL FEATURES FOR 3D MODEL BASED CODING APPLICATIONS
This dissertation 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 …
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