Dynamic Medial Axes of Planar Shapes

2006 ◽  
pp. 460-468 ◽  
Author(s):  
Kai Tang ◽  
Yongjin Liu
Keyword(s):  
Planar Shapes

Similarity-invariant signatures for partially occluded planar shapes

1992 ◽  
Vol 7 (3) ◽  
pp. 271-285 ◽  
Author(s):  
Alfred M. Bruckstein ◽  
Nir Katzir ◽  
Michael Lindenbaum ◽  
Moshe Porat
Keyword(s):  
Invariant Signatures ◽  
Planar Shapes ◽  
Similarity Invariant ◽  
Partially Occluded

scholarly journals Comparing Model-based Versus K-means Clustering for the Planar Shapes

2020 ◽  
Vol 15 (1) ◽  
pp. 99-109
Author(s):  
M. Golalizadeh ◽  
H. Jafari ◽  
◽  
Keyword(s):  
Model Based ◽  
Planar Shapes

MANIPULATING PLANAR SHAPES WITH A LIGHT-SENSITIVE EXCITABLE MEDIUM: COMPUTATIONAL STUDIES OF CLOSED-LOOP SYSTEMS

2006 ◽  
Vol 16 (08) ◽  
pp. 2333-2349 ◽  
Author(s):  
SERGEY SKACHEK ◽  
ANDREW ADAMATZKY ◽  
CHRIS MELHUISH
Keyword(s):  
Closed Loop ◽  
Space Time ◽  
Excitable Medium ◽  
Computational Studies ◽  
Wave Fronts ◽  
Nonlinear Media ◽  
Time Dynamics ◽  
Distributed Manipulation ◽  
Closed Loop Systems ◽  
Planar Shapes

We study how to employ space-time dynamics in nonlinear media to achieve distributed manipulation of objects — positioning, orienting and transporting objects by wave-fronts and patterns in excitable medium. We present the results of computational experiments of a massive parallel actuator controlled by a cellular-automaton model of an excitable medium. The model incorporates closed-loop actuation where sites of the medium can be excited not only by their closest neighbors but also by the edges of the manipulated object. We analyze motion of basic planar shapes (either initially aligned along axes or randomly oriented) induced by an actuator controlled by excitable lattice with various excitation rules. We demonstrate that space-time excitation dynamics in discrete nonlinear media bears a huge potential in terms of sensible nontrivial manipulation of planar shapes.

Manufactured Cracks in Pipe Used to Evaluate ILI Measurement Performance

2020 ◽  
Author(s):  
Jason Skow ◽  
Joseph W. Krynicki ◽  
Lujian Peng
Keyword(s):  
Field Conditions ◽  
Valuable Data ◽  
Naturally Occurring ◽  
Transmission Pipeline ◽  
Planar Shapes ◽  
Small Cracks

Abstract Recently, transmission pipeline operators have started designing pipe spools with manufactured cracks of very precise size and orientation for the purpose of qualifying measurement technologies. The manufactured cracks are very similar to naturally occurring cracks and can be made to have varied profiles and off-planar shapes (like hook cracks). The manufactured spools are installed on a transmission pipeline at either the pipe launcher, the receiver or in-line such that an in-line inpsection (ILI) tool passes through it during a transmission pipeline ILI field run. This produces highly valuable data to evaluate measurement performance because the crack sizes are precisely known, crack morphologies are similar to realistic cracks and the ILI tool is tested in field conditions. This paper describes the effect on the estimated ILI tool measurement performance for various combinations of manufactured cracks in a pipe spool. The cases described vary the number of manufactured cracks in the spool to estimate the value of each additional crack and vary the distribution of cracks sizes to compare the value of large versus small cracks.

scholarly journals A new area-based convexity measure with distance weighted area integration for planar shapes

2019 ◽  
Vol 71 ◽  
pp. 176-189 ◽  
Author(s):  
Rui Li ◽  
Xiayan Shi ◽  
Yun Sheng ◽  
Guixu Zhang
Keyword(s):  
Distance Weighted ◽  
Planar Shapes ◽  
Convexity Measure
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