Improved delta-T and size metrics for thermally structured targets

Alexander Akerman III; Ronald Patton; Charles E. Lucius

doi:10.1117/12.21798

1 September 1990 Improved delta-T and size metrics for thermally structured targets

Alexander Akerman III, Ronald Patton, Charles E. Lucius

Proceedings Volume 1310, Signal and Image Processing Systems Performance Evaluation; (1990) https://doi.org/10.1117/12.21798
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

The PRISM model produces inherent temperatures of a target's external facets. Conventional predictions of target detection/recognition simpiy sum these temperatures on an area weighted basis to determine the average target temperature. In turn, that temperature is subtracted from background to determine the delta-T value for entering the MRT curve. We have jroduced a more accurate and representative methodology for computing delta-T. First, the PRISM faceted target model is represented in our VALUE software, which accounts for mutual surface blockage. A grey scale image of the PRISM- generated facet temperatures is produced. The image is convolved with an eye-equivalent MTF, and thence delta-T computed based upon absolute values of differences between background and the target's (unobscured) facets. These results are further normalized with respect to uniform (single temperature) targets. A synergistic calculation determines a more representative measure ofthe target's minimum angular size, which is also needed for predicting probability of detection/recognition. We compute the target's orientation from its image silhouette moments, rotate the target around its silhouette center of mass, encapsulate it with a rectangle, and then count the target extent across each scanline. These counts are averaged into an equivalent angular size.

Citation Download Citation

Alexander Akerman III, Ronald Patton, and Charles E. Lucius "Improved delta-T and size metrics for thermally structured targets", Proc. SPIE 1310, Signal and Image Processing Systems Performance Evaluation, (1 September 1990); https://doi.org/10.1117/12.21798

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