Towards Intelligent Crowd Behavior Understanding Through the STFD Descriptor Exploration
AbstractRealizing the automated and online detection of crowd anomalies from surveillance CCTVs is a research-intensive and application-demanding task. This research proposes a novel technique for detecting crowd abnormalities through analyzing the spatial and temporal features of input video signals. This integrated solution defines an image descriptor (named spatio-temporal feature descriptor —STFD) that reflects the global motion pattern of crowds over time. A designed convolutional neural network (CNN) has then been adopted to classify dominant or large-scale crowd abnormal behaviors. The work reported has focused on...
Source: Sensing and Imaging - April 25, 2018 Category: Biomedical Engineering Source Type: research
Comparison Study of Regularizations in Spectral Computed Tomography Reconstruction
AbstractThe energy-resolving photon-counting detectors in spectral computed tomography (CT) can acquire projections of an object in different energy channels. In other words, they are able to reliably distinguish the received photon energies. These detectors lead to the emerging spectral CT, which is also called multi-energy CT, energy-selective CT, color CT, etc. Spectral CT can provide additional information in comparison with the conventional CT in which energy integrating detectors are used to acquire polychromatic projections of an object being investigated. The measurements obtained by X-ray CT detectors are noisy in...
Source: Sensing and Imaging - March 27, 2018 Category: Biomedical Engineering Source Type: research
Palmprint Region of Interest Cropping Based on Moore-Neighbor Tracing Algorithm
AbstractIn recent years, several algorithms have been proposed to extract the region of the interest (ROI) from the palmprint, by implementing morphological operations (e.g., erosion and dilation), gradient information, or edge detection algorithms to trace the boundary of the palm; which have their shortcomings in the accuracy of tracing the boundary. In the proposed method, the Moore-Neighbor tracing algorithm is implemented to trace the boundary of the palm which shows stability in extracting the boundary of the palm. The PolyU palmprint database II was used to verify the effectiveness of the proposed method. The result...
Source: Sensing and Imaging - March 26, 2018 Category: Biomedical Engineering Source Type: research
Reduction of Angularly-Varying-Data Truncation in C-Arm CBCT Imaging
AbstractC-arm cone-beam computed tomography (CBCT) has been used increasingly as an imaging tool for yielding 3D anatomical information about the subjects in surgical and interventional procedures. In the clinical applications, the limited field-of-view (FOV) of C-arm CBCT can lead to significant data truncation, resulting in image artifacts that can obscure low contrast tumor embedded within soft-tissue background, thus limiting the utility of C-arm CBCT. The truncation issue can become serious as most of the surgical and interventional procedures would involve devices and tubes that are placed outside the FOV of C-arm CB...
Source: Sensing and Imaging - March 23, 2018 Category: Biomedical Engineering Source Type: research
