Motion Segmentation Research Papers - Academia.edu (original) (raw)

In this paper, we present a practical vision based Simultane-ous Localization and Mapping (SLAM) system for a highly dynamic environment. We adopt a multibody Structure from Motion (SfM) approach, which is the generalization of classical... more

In this paper, we present a practical vision based Simultane-ous Localization and Mapping (SLAM) system for a highly dynamic environment. We adopt a multibody Structure from Motion (SfM) approach, which is the generalization of classical SfM to dynamic scenes with multiple rigidly mov-ing objects. The proposed framework of multibody visual SLAM allows choosing between full 3D reconstruction or simply tracking of the moving objects, which adds flexibil-ity to the system, for scenes containing non-rigid objects or objects having insufficient features for reconstruction. The solution demands a motion segmentation framework that can segment feature points belonging to different motions and maintain the segmentation with time. We propose a re-altime incremental motion segmentation algorithm for this purpose. The motion segmentation is robust and is capa-ble of segmenting difficult degenerate motions, where the moving objects is followed by a moving camera in the same direction. This robu...

Cervical myelopathy is a varied clinical syndromes resulting from spinal cord dysfunction. Underlying causes are numerous, but spondylosis at one or more levels is the most common etiology. Natural history studies have demonstrated a... more

Cervical myelopathy is a varied clinical syndromes resulting from spinal cord dysfunction. Underlying causes are numerous, but spondylosis at one or more levels is the most common etiology. Natural history studies have demonstrated a variable clinical course with gradual neurologic deterioration in a majority of patients. While prospective clinical comparisons are limited, existing literature suggests that operative management reliably arrests

Sudden deceleration and frontal/rear impact configurations involve rapid movements that can cause spinal injuries. This study aimed to investigate the rotation rate effect on the L2-L3 motion segment load-sharing and to identify which... more

Sudden deceleration and frontal/rear impact configurations involve rapid movements that can cause spinal injuries. This study aimed to investigate the rotation rate effect on the L2-L3 motion segment load-sharing and to identify which spinal structure is at risk of failure and at what rotation velocity the failure may initiate? Five degrees of sagittal rotations at different rates were applied in a detailed finite-element model to analyze the responses of the soft tissues and the bony structures until possible fractures. The structural response was markedly different under the highest velocity that caused high peaks of stresses in the segment compared to the intermediate and low velocities. Under flexion, the stress was concentrated at the upper pedicle region of L2 and fractures were firstly initiated in this region and then in the lower endplate of L2. Under extension, maximum stress was located in the lower pedicle region of L2 and fractures started in the left facet joint, then ...

To find the optimal path by interacting with multiple robots is the main research area in field of robotics. The task is to find the global optimal path with a minimum amount of computation time. Path planning has numerous application... more

To find the optimal path by interacting with multiple robots is the main research area in field of robotics. The task is to find the global optimal path with a minimum amount of computation time. Path planning has numerous application like industrial robotics, to design autonomous system etc. In this paper, we survey on three most recent algorithms namely Bacteria forging Optimization (BFO), Ant Colony Optimization (ACO), Particle Swam Optimization (PSO) that can apply on multiple robots to find the optimal path. The main feature of BFO is the chemotactic movement of a virtual bacterium that is helpful to investigate the all the possible path and finally arrived at optimal solution. In Ant Colony System (ACS) algorithm is integration of heuristic and visibility equation of state transition rules for finding the optimal path. PSO is stochastic optimization technique inspired by social behaviour of bird flocking. The solutions, called particles, fly through the problem space by some set of the rules.

This study investigated the reliability of manual examination procedures and the frequency that each or multiple segments in the upper cervical spine above the C4 vertebra were the dominant source of pain in subjects with cervicogenic... more

This study investigated the reliability of manual examination procedures and the frequency that each or multiple segments in the upper cervical spine above the C4 vertebra were the dominant source of pain in subjects with cervicogenic headache (CGH). Eighty subjects were evaluated, 60 with CGH (39 females, mean age 33 years) and arbitrarily a further 20 asymptomatic subjects (13 females, mean age 34 years) included to reduce examiner bias, but subsequently omitted from data analysis. Two experienced physiotherapists examined on the same day each subject with standard manual examination procedures, independently rating each segment in the upper cervical spine above the C4 vertebra for involvement. Examiners were blind to each other's findings and the subject's clinical status. Standard and adjusted Kappa coefficients were calculated for each segment in symptomatic subjects only. Chi-squared analysis for goodness of fit was used to identify the segment that was most frequently determined the predominant symptomatic segment. Manual examination above the C4 vertebra showed good reliability. The C1/2 segment was most commonly symptomatic, with a positive finding at this segment in 63% of cases. The high frequency of C1/2 involvement in CGH highlights the importance of examination and treatment procedures for this motion segment.

The BGSLibrary has been designed to provides an easy-to-use C++ framework and tools to perform background subtraction. First released in March 2012, currently the library offers 32 background subtraction algorithms. The source code is... more

The BGSLibrary has been designed to provides an easy-to-use C++ framework and tools to perform background subtraction. First released in March 2012, currently the library offers 32 background subtraction algorithms. The source code is available under GNU GPL v3 license and the library is free for non-commercial use, open source and platform independent. Note that the license of the algorithms included in BGSLibrary not necessarily have the same license of the library. Some authors do not allow that their algorithms will be used for a commercial purpose, first is needed to contact them to ask permission. However, by default, we decided to adopt the GPL-v3 license.
The BGSLibrary also provides one Java based GUI (Graphical User Interface) allowing the users to configure the input video-source, region of interest, and the parameters of each BS algorithm. A MFC-based GUI is also provided for a quick access in Windows computers. But, a QT-based GUI is coming for a platform independent usage. To build/run the BGSLibrary, it is necessary to have the OpenCV library installed previously. Everyone is invited to collaborate with the BGSLibrary. In this chapter some efforts has been made for how to make and add your contributions in the library.

Background. Spondylodesis may be performed for patients with spondylolysis and degenerative olisthesis if conservative treatment fails. Spinal fusion may decrease the spine mobility and trunk muscle force by causing muscle atrophy.... more

Background. Spondylodesis may be performed for patients with spondylolysis and degenerative olisthesis if conservative treatment fails. Spinal fusion may decrease the spine mobility and trunk muscle force by causing muscle atrophy. Patients and methods. Thirty eight spondylodesis patients (10 spondylolysis and 28 degenerative olisthesis) were studied. Spine mobility, trunk muscle force and back pain (VAS 0-100mm) in rest or during

We describe the use of atomic force microscopy (AFM) to investigate the nanomechanical properties of annulus fibrosus (AF)-the outer fibrous layer of an intervertebral disc (IVD) encapsulating the inner jelly-like mass known as the... more

We describe the use of atomic force microscopy (AFM) to investigate the nanomechanical properties of annulus fibrosus (AF)-the outer fibrous layer of an intervertebral disc (IVD) encapsulating the inner jelly-like mass known as the nucleus pulposus (NP). Disk disease, degenerated discs, slipped discs, and herniated discs are common terms often linked to back pain and are caused due to degeneration of IVD. Due to the variations in the structure and biochemical composition of the IVD, studies of macromechanical properties in the motion segment or AF may lack all significant nanomechanical responses or behaviors. Existing studies do not report the micro or nano level of mechanics of IVD components and whether the nanomechanics of this tissue mimic its macromechanical behavior is not known. Our studies used AFM to investigate the regional micromechanical properties of the AF that have been otherwise difficult due to small sample size of the tissue. Five different zones including periphe...