Spatial-temporal signal processing for subsurface thermographic imaging

Steven M. Shepard; James R. Lhota

doi:10.1117/12.497523

1 April 2003 Spatial-temporal signal processing for subsurface thermographic imaging

Steven M. Shepard, James R. Lhota

Proceedings Volume 5073, Thermosense XXV; (2003) https://doi.org/10.1117/12.497523
Event: AeroSense 2003, 2003, Orlando, Florida, United States

Abstract

Analysis and processing of thermographic NDT data has been primarily based on either visual analysis of single images acquired during the cooling sequence, or examination of a contrast curve based on comparison to a defect free reference region. Analysis of the sequence is complicated by the fact that the surface temperature of the sample decreases monotonically over a large dynamic range, yet the temperature differences generated by subsurface features may be small by comparison. A simple linearization operation can be performed on the entire sequence so that the time history of each pixel behaves in a manner similar to that of the contrast curve. The linearized data allows visualization of the entire sequence in a fixed dynamic range that is small enough to allow visualization of weak features, as well as presentation of the data in a line slice manner similar to an ultrasonic b-scan.

Citation Download Citation

Steven M. Shepard and James R. Lhota "Spatial-temporal signal processing for subsurface thermographic imaging", Proc. SPIE 5073, Thermosense XXV, (1 April 2003); https://doi.org/10.1117/12.497523

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available