Shawn Recker

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Osteoporotic fractures (OFs) are a major public health problem. Direct evidence of the importance and, particularly, the magnitude of genetic determination of OF per se is essentially nonexistent. Colles' fractures (CFs) are a common type of OF. In a metropolitan white female population in the midwestern United States, we found significant genetic(More)
This paper presents a novel, interactive visualization tool that allows for the analysis of scene structure uncertainty and its sensitivity to parameters in different multi-view scene reconstruction stages. Given a set of input cameras and feature tracks, the volume rendering-based approach first creates a scalar field from angular error measurements. The(More)
This paper presents a framework for N-view triangula-tion of scene points, which improves processing time and final reprojection error with respect to standard methods, such as linear triangulation. The framework introduces an angular error-based cost function, which is robust to out-liers and inexpensive to compute, and designed such that simple adaptive(More)
—Structure-from-Motion (SfM) applications attempt to reconstruct the three-dimensional (3D) geometry of an underlying scene from a collection of images, taken from various camera viewpoints. Traditional optimization techniques in SfM, which compute and refine camera poses and 3D structure, rely only on feature tracks, or sets of corresponding pixels,(More)
This paper presents a framework for GPU-accelerated N-view triangulation in multi-view reconstruction that improves processing time and final reprojection error with respect to methods in the literature. The framework uses an algorithm based on optimizing an angular error-based L 1 cost function and it is shown how adaptive gradient descent can be applied(More)
The angular error-based triangulation method and the par-allax path method are both high-performance methods for large-scale multi-view sequential reconstruction that can be parallelized on the GPU. We map parallax paths to the GPU and test its performance and accuracy as a triangulation method for the first time. To this end, we compare it with the angular(More)
BACKGROUND Substance P (SP) is a neuropeptide known to enhance the swallow response. It likely acts as a neurotransmitter in the pharyngeal mucosa in response to local stimuli. It has been proposed that dysphagia after stroke may be related to reduced levels of SP, which therefore constitutes a therapeutic target. In the present pilot study, we evaluated(More)