With the development and wide application of motion capture technology, the captured motion data sets are becoming larger and larger. For this reason, an efficient retrieval method for the motion database is very important. The retrieval method needs an appropriate indexing scheme and an effective similarity measure that can organize the existing motion data well. In this paper, we represent a ...

1. INTRODUCTION. STANDARD TRAMMEL. Figure 1a shows a line segment of fixed length whose ends slide along two perpendicular axes. It can be realized physically as a sliding ladder or as a sliding door moving with its ends on two perpendicular tracks. During the motion, a fixed point on the segment traces an ellipse with one quarter of the ellipse in each quadrant (Figure 1b), so this device is c...

Background Measurement accuracy of joint kinematics is influenced by how closely the trajectories of surface markers represent the motion of underlying bones [1]. For the Oxford Foot Model (OFM) hindfoot segment, the heel (HEE), lateral calcaneus (LCA) and sustentaculum tali (STL) markers are used to track the movement of the calcaneus [2]. This paper investigates the how changes in marker plac...

Background Differences in dynamic foot function between young and older adults have been reported [1], however foot kinematics during walking remain largely unquantified. Our understanding of foot kinematics during walking is largely based on single-segment foot models, which limits the inferences that can be made about foot motion. This study aimed to determine if differences in foot kinematic...

Humans possess the remarkable ability to perceive color, shape, and motion, and to differentiate between light intensities varied by over nine orders of magnitude. Phototransduction--the process in which absorbed photons are converted into electrical responses--is the first stage of visual processing, and occurs in the outer segment, the light-sensing organelle of the photoreceptor cell. Studie...

In this paper, we propose a level set approach to decompose the image plane into segments with consistent apparent motion and recover parametric models that best describe such a motion. The number of motion planes and initial motion parameters are obtained by robust block-wise optical flow estimation, followed by non-parametric clustering in the motion parameter space. Implicit representations ...

Studies investigating walking gait have traditionally either modeled the foot as a single rigid segment, or as a rearfoot segment. While these studies have improved the understanding of foot function during gait, they assume the joints distal to the calcaneus do not contribute significantly to foot function. Recent, in-vitro [1] and invasive in-vivo [2] studies, however, suggest that significan...

This paper presents a layer-model based method to segment moving objects from image sequence with accurate boundaries. The segmentation framework involves three stages: Motion seed detection, Motion layer expansion and Motion boundary refinement. In the first stage, motion seeds, which determine the amount and initial position of motion layers, are detected by corner matching between consecutiv...

BACKGROUND There is uncertainty as to which foot posture measures are the most valid in terms of predicting kinematics of the foot. The aim of this study was to investigate the associations of clinical measures of static foot posture and mobility with foot kinematics during barefoot walking. METHOD Foot posture and mobility were measured in 97 healthy adults (46 males, 51 females; mean age 24...

BACKGROUND Instrumented lumbar arthrodesis has been established as the gold standard in the care of patients with degenerative disc disease. However, spinal fusion results in the elimination of motion of the functional spinal unit and has been implicated in the development of adjacent-level degeneration. Motion-preserving devices such as the dynamic rod allow for stabilization of a pathologic m...