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Dive into the research topics where Zaffir A. Chaudhry is active.

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Featured researches published by Zaffir A. Chaudhry.


machine vision applications | 2016

A context-driven approach to image-based crack detection

Hongcheng Wang; Ziyou Xiong; Alan Matthew Finn; Zaffir A. Chaudhry

We present a novel context-driven approach to image-based crack detection for automated inspection of aircraft surface and subsurface defects. In contrast to existing image-based crack detection methods, which rely mostly on low-level image processing and data-driven methods, our method explicitly incorporates multiple high-level context into low-level processing. We present two classes of context: geometric/structural context and physical context. We formulate mathematically a sparse decomposition problem to incorporate the context and apply robust principal component analysis to decompose typical repetitive rivet regions into a normal component and a sparse component. Cracks are detected in the sparse component. By applying the proposed context-driven approach to coated and uncoated test specimens, we achieve significant reduction in false detections compared to the approach without exploiting context.


Archive | 2006

SELF-LUBRICATED ACTUATOR FOR ON-BLADE ROTOR CONTROL

Andrew John Collins; Zaffir A. Chaudhry; Ulf J. Jonsson; Fanping Sun; Brian E. Wake; Michael G. O'Callaghan; Jimmy Lin-Min Yeh


Archive | 2007

On-blade actuator for helicopter rotor blade control flaps

Jimmy Lih-Min Yeh; Fanping Sun; Zaffir A. Chaudhry; Robert H. Dold; Ulf J. Jonsson; Brian E. Wake; Michael G. O'Callaghan


Archive | 2007

Hybrid actuator for helicopter rotor blade control flaps

Fanping Sun; Zaffir A. Chaudhry; Jimmy Lih-Min Yeh; Michael G. O'Callaghan; Ulf J. Jonsson; Brian E. Wake; Robert H. Dold


Archive | 2006

Rotorcraft control system and method of using

Zaffir A. Chaudhry; Ming Cao; Brian E. Wake


Archive | 2008

Method and apparatus for monitoring structural health

Anindya Ghoshal; Roxana Zangor; Zaffir A. Chaudhry; Jimmy Lih-Min Yeh; Jeffery R. Schaff; Mark W. Davis


Archive | 2013

Elevator cord health monitoring

Fanping Sun; John P. Wesson; Xiaodong Luo; Huan Zhang; Zaffir A. Chaudhry; Daniel A. Mosher; Yan Chen; Mark S. Thompson


Archive | 2006

Brushless direct current motor (bldc) based actuator for helicopter rotor control

Zaffir A. Chaudhry; Brian Wake; Sun Fanping; Richard Jeremy Bedwell; Lee A. Hoffman; Jimmy Lih-Min Yeh


Archive | 2005

Brushless direct current (bldc) motor based linear or rotary actuator for helicopter rotor control

Zaffir A. Chaudhry; Brian E. Wake; Fanping Sun; Richard Jeremy Bedwell; Jimmy Lin-Min Yeh; Lee A. Hoffman


Archive | 2009

LOW ENERGY CLUTCH FOR ELECTRONIC DOOR LOCK

John M. Milton-Benoit; Ulf J. Jonsson; Robert H. Dold; Fanping Sun; Zaffir A. Chaudhry

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