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.
Results
Showing 1 to 14 of 14 for “"Range Image"”.
-
Feature extraction for range image interpretation using local topology statistics
This thesis presents an approach for interpreting range images of known subject matter, such as the human face, based on the extraction and matching of local features from the images. In recent years, approaches to interpret two-dimensional (2D) images based on local feature extraction have …
-
Extraction of 3D Object Representations from a Single Range Image
… computer model of 3D solid objects from a single range image. This research has many real world applications, including robotic environments and the inspection of industry parts. The most common methods for 3D-object extraction are based on stereo reconstruction and structured light analysis. The …
-
Real-time Realistic Rendering And High Dynamic Range Image Display And Compression
… light transport computation. Unfortunately, the images resulting from Monte Carlo approaches generally suffer from visually unacceptable noise artifacts. The result of any light transport simulation is, by its very nature, an image of high dynamic range (HDR). This leads to the issues of the …
-
Towards an Improved Hardware Implementation of a Tone Mapping Algorithm for Wide Dynamic Range Image Display
… algorithms are utilized to adapt wide dynamic range (WDR) images to limited dynamic range (LDR) displays while maintaining the images’ details. This thesis presents an analog current mode implementation that will realize an exponent-based tone mapping algorithm, including both global and local …
-
On the use of prior knowledge in deep learning algorithms
… on average. Secondly, we investigate the case of image-enhancement. We take advantage of the composite nature of the task of transform a low-resolution low-dynamic range image, into a higher resolution, higher dynamic range image. We also investigate the application of mixed losses in this …
-
Robust recovery of piled box-like objects in range images
… moving the robotic hand along the pallet, and a range image is acquired. Secondly, the image is analyzed and the graspable objects in the pile are localized. Thirdly, the robot grasps the recovered objects from their exposed surfaces and places them at a user defined position. This procedure is …
-
Development of High Speed High Dynamic Range Videography
… the high speed video community is the dynamic range of the sensors. The dynamic range of the sensor is constrained to the bit depth of the analog to digital converter, the deep well capacity of the sensor site, and baseline noise. A typical high speed camera can span a 60 dB dynamic range, …
-
Intelligent laser scanning for computer aided manufacture.
… techniques. This is important within a wide range of commercial and scientific fields where CAD models may be unavailable for parts that must be duplicated or modified, or where a physical model is used as a prototype. The three-dimensional digitisation of objects is an essential first step …
-
Toward the detection of landscape features : clustering 3D points using spatial and thematic characteristics
… discipline of Computer Vision, and adapted a 3D range image segmentation accuracy assessment technique. I also contributed new techniques for segmentation quality assessment including two area under the curve indices and the development of new segmentation surface plots. Experimental evaluations …
-
Automated Detection of Surface Defects on Barked Hardwood Logs and Stems Using 3-D Laser Scanned Data
… knowledge base. Three-dimensional laser-scanned range data capture the external log shapes and portray bark pattern, defective knobs, and depressions. The log data are extremely noisy, have missing data, and include severe outliers induced by loose bark that dangles from the log trunk. Because …
-
Image-based Material Editing
Photo editing software allows digital images to be blurred, warped or re-colored at the touch of a button. However, it is not currently possible to change the material appearance of an object except by painstakingly painting over the appropriate pixels. Here we present a set of methods for …
-
Modeling Forest Canopy Distribution from Ground-Based Laser Scanner Data
… scale. The raw data consist of a series of range measurements to visible surfaces taken at known angles relative to the scanner. Data were translated into three dimensional (3D) point clouds with points corresponding to surfaces visible from the scanner vantage point. A 20 m x 40 m permanent …
-
Characterization of The Count Rate Performance and Evaluation of The Effects of High Count Rates On Modern Gamma Cameras
… linearly with total activity used across a large range. Image uniformity, spatial resolution, and energy resolution degraded linearly with count rate and image distorting effects were observed. Guidelines for CRP testing and a possible method for the correction of count rate losses for clinical …
-
Visibility metrics and their applications in visually lossless image compression
Visibility metrics are image metrics that predict the probability that a human observer can detect differences between a pair of images. These metrics can provide localized information in the form of visibility maps, in which each value represents a probability of detection. An important …