The accessibility verification of the assembly/disassembly plays an important role in the process of product design. In the last decade, the sampling based motion planners have been successfully applied to solve the accessibility verification. However, the narrow passage which is a common problem in the assembly tasks is still a bottleneck. Meanwhile, the requirement of perception and emotion a...

We study the problem of segmenting moving objects in unconstrained videos. Given a video, the task is to segment all the objects that exhibit independent motion in at least one frame. We formulate this as a learning problem and design our framework with three cues: (i) independent object motion between a pair of frames, which complements object recognition, (ii) object appearance, which helps t...

We propose a method for the computation of dense optical flow fields between two images of a video sequence. In a preprocessing step, the algorithm segments the reference frame into regions of homogenous colour. The flow vectors inside such regions are supposed to vary smoothly, while motion boundaries are assumed to coincide with boundaries of those regions. Given an initial affine motion mode...

STUDY DESIGN Measurement of the kinematics of the lumbar spine after insertion of an interspinous spacer in vitro. OBJECTIVES To understand the kinematics of the instrumented and adjacent levels due to the insertion of this interspinous implant. SUMMARY OF BACKGROUND DATA An interspinous spacer (X Stop, SFMT, Concord, California) has been developed to treat neurogenic intermittent claudicat...

OBJECTIVE The purpose of this study was to figure out the radiologic findings and risk factors related to adjacent segment degeneration (ASD) after anterior cervical discectomy and fusion (ACDF) using 3-year follow-up radiography, computed tomography (CT), and magnetic resonance image (MRI). METHODS A retrospective matched comparative study was performed for 64 patients who underwent single-l...

We present a general approach to determine 3D motion and structure of multiple objects undergoing arbitrary motions. We segment the scene based on 3D motion parameters. First, the general motion model is tted to each single trajectory. For this nonlin-ear tting, initial estimtes are obtained by a linear multiple motion SFM algorithm using the rst two frames. Next, trajectories are clustered int...

A new method for active visual attention is briefly introduced in this paper. The method extracts motion and shape features from indefinite image sequences, and integrates these features to segment the input scene. The aim of this paper is to highlight the importance of the accumulative computation method for motion features extraction in the active selective visual attention model proposed. We...