A Distance Transform Method for History Matching of Discrete Geologic Facies Models

2017 ◽  
Author(s):  
Siavash Hakim Elahi ◽  
Behnam Jafarpour
Keyword(s):  
History Matching ◽  
Distance Transform ◽  
Transform Method ◽  
Facies Models

scholarly journals Indoor Mapping Guidance Algorithm of Rotary-Wing UAV Including Dead-End Situations

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4854
Author(s):  
Jongho Park ◽  
Jaehyun Yoo
Keyword(s):  
Velocity Vector ◽  
Distance Transform ◽  
Indoor Environments ◽  
Safe Distance ◽  
Transform Method ◽  
Dead End ◽  
Data Points ◽  
Guidance Algorithm ◽  
Limited Sensing ◽  
Rotary Wing

A mapping guidance algorithm of a quadrotor for unknown indoor environments is proposed. A sensor with limited sensing range is assumed to be mounted on the quadrotor to obtain object data points. With obtained data, the quadrotor computes velocity vector and yaw commands to move around the object while maintaining a safe distance. The magnitude of the velocity vector is also controlled to prevent a collision. The distance transform method is applied to establish dead-end situation logic as well as exploration completion logic. When a dead-end situation occurs, the guidance algorithm of the quadrotor is switched to a particular maneuver. The proposed maneuver enables the quadrotor not only to escape from the dead-end situation, but also to find undiscovered area to continue mapping. Various numerical simulations are performed to verify the performance of the proposed mapping guidance algorithm.

scholarly journals Characterizing Fiber Diameter Variability in Nonwovens

1999 ◽  
Vol os-8 (1) ◽  
pp. 1558925099OS-80
Author(s):  
B. Pourdeyhemi
Keyword(s):  
Image Analysis ◽  
Fiber Orientation ◽  
Fiber Diameter ◽  
Field Analysis ◽  
Distance Transform ◽  
Simulation Methods ◽  
Direct Measure ◽  
Transform Method ◽  
Tracking Method ◽  
Flow Field Analysis

This paper reports on the application of the image analysis methods for characterizing fiber orientation in nonwovens. In our earlier work in this area, we reported on simulation methods as well as three methods (chord tracking, Fourier transform and Flow Field Analysis) for the measurement of fiber orientation. The chord tracking was found to be the method of choice when a direct measure of orientation was desired. This paper outlines the steps necessary to apply the chord tracking method to real fabrics. In order to deal with real webs, it was found necessary to develop a lighting scheme that resulted in images with sufficient contrast suitable for processing as well as to develop an appropriate thresholding method to obtain data suitable for analysis. Further, it is demonstrated that fiber diameter variation can be determined easily by using a “distance transform” method.

History matching and uncertainty quantification of facies models with multiple geological interpretations

2013 ◽  
Vol 17 (4) ◽  
pp. 609-621 ◽  
Author(s):  
Hyucksoo Park ◽  
Céline Scheidt ◽  
Darryl Fenwick ◽  
Alexandre Boucher ◽  
Jef Caers
Keyword(s):  
Uncertainty Quantification ◽  
History Matching ◽  
Facies Models
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