scholarly journals Track-Before-Detect Framework-Based Vehicle Monocular Vision Sensors

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 560 ◽  
Author(s):  
Hernan Gonzalez ◽  
Sergio Rodriguez ◽  
Abdelhafid Elouardi
Keyword(s):  
Moving Objects ◽  
Motion Segmentation ◽  
Scene Analysis ◽  
Experimental Conditions ◽  
Vision Sensors ◽  
Dynamic Scene Analysis ◽  
Segmentation Approach ◽  
Tightly Coupled ◽  
Track Before Detect ◽  
Embedded Implementation

This paper proposes a Track-before-Detect framework for a multibody motion segmentation (named TbD-SfM). Our contribution relies on a tightly coupled tracking before detection strategy intended to reduce the complexity of existing Multibody Structure from Motion approaches. Efforts were done towards an algorithm variant closer and aimed to a further embedded implementation for dynamic scene analysis while enhancing processing time performances. This generic motion segmentation approach can be transposed to several transportation sensor systems since no constraints are considered on segmented motions (6-DOF model). The tracking scheme is analyzed and its performance is evaluated under thorough experimental conditions including full-scale driving scenarios from known and available datasets. Results on challenging scenarios including the presence of multiple and simultaneous moving objects observed from a moving camera are reported and discussed.

The Threshold for Sudden Changes in the Velocity of a Seen Object

1950 ◽  
Vol 2 (1) ◽  
pp. 33-41 ◽  
Author(s):  
W. E. Hick
Keyword(s):  
Initial Velocity ◽  
Moving Objects ◽  
Significant Proportion ◽  
Difference Threshold ◽  
Experimental Conditions ◽  
Velocity Change ◽  
The Mean ◽  
The Difference ◽  
Velocity Changes ◽  
Method Of Constant Stimuli

The difference threshold for the velocity of a seen object was measured by the method of constant stimuli, using two categories. An approximate correspondence with Weber's law was found, the divergence from it appearing, in general, as an increase of the threshold at both ends of the range of initial velocities. The Mean Threshold (0·5 probability of perception, corrected for guessing) was, in favourable conditions, about 12 per cent, of the initial velocity. Whether the stimulus was an increase or a decrease of velocity made no marked difference. With two moving objects, which converged, crossed, and then diverged, both suffering the same change of velocity, the threshold was higher. Velocity changes as low as 2 · 5 per cent, elicited a significant proportion of correct responses. Some theoretical points in connection with this are discussed. Responses to blank stimuli showed a strong tendency to guess “slower,” which tendency differed significantly in degree between most of the experimental conditions. Tests with reduced exposure times showed that exposures could be as short as 0 · 5 second (the velocity change occurring in the middle of the exposure) without appreciable detriment.

3D Dynamic Scene Analysis

1992 ◽  
Author(s):  
Zhengyou Zhang ◽  
Olivier Faugeras
Keyword(s):  
Scene Analysis ◽  
Dynamic Scene ◽  
Dynamic Scene Analysis

scholarly journals A versatile multivariate image analysis pipeline reveals features of Xenopus extract spindles

2016 ◽  
Vol 213 (1) ◽  
pp. 127-136 ◽  
Author(s):  
Andrew W. Grenfell ◽  
Magdalena Strzelecka ◽  
Marina E. Crowder ◽  
Kara J. Helmke ◽  
Anne-Lore Schlaitz ◽  
...  
Keyword(s):  
Quantitative Information ◽  
Analysis Pipeline ◽  
Experimental Conditions ◽  
Experimental Systems ◽  
General Utility ◽  
Segmentation Approach ◽  
Assembly Factor ◽  
Minimal Modification ◽  
Insight Into ◽  
Multivariate Image

Imaging datasets are rich in quantitative information. However, few cell biologists possess the tools necessary to analyze them. Here, we present a large dataset of Xenopus extract spindle images together with an analysis pipeline designed to assess spindle morphology across a range of experimental conditions. Our analysis of different spindle types illustrates how kinetochore microtubules amplify spindle microtubule density. Extract mixing experiments reveal that some spindle features titrate, while others undergo switch-like transitions, and multivariate analysis shows the pleiotropic morphological effects of modulating the levels of TPX2, a key spindle assembly factor. We also apply our pipeline to analyze nuclear morphology in human cell culture, showing the general utility of the segmentation approach. Our analyses provide new insight into the diversity of spindle types and suggest areas for future study. The approaches outlined can be applied by other researchers studying spindle morphology and adapted with minimal modification to other experimental systems.

Dynamic scene analysis for a mobile robot in a man-machine environment

1988 ◽  
Vol 19 (2) ◽  
pp. 1-9
Author(s):  
Yasushi Yagi ◽  
Minoru Asada ◽  
Masahiko Yachida ◽  
Saburo Tsuji
Keyword(s):  
Mobile Robot ◽  
Scene Analysis ◽  
Dynamic Scene ◽  
Dynamic Scene Analysis
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