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.

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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

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KEYWORDS

Prisms

Target detection

Image enhancement

Sensors

Systems modeling

Thermal modeling

Eye models

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