Technique for ground/image truthing using a digital map to reduce the number of required measurements

Sandor Z. Der; G. John Dome; Gerald A. Rusche

doi:10.1117/12.45739

1 July 1991 Technique for ground/image truthing using a digital map to reduce the number of required measurements

Sandor Z. Der, G. John Dome, Gerald A. Rusche

Proceedings Volume 1483, Signal and Image Processing Systems Performance Evaluation, Simulation, and Modeling; (1991) https://doi.org/10.1117/12.45739
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

The U.S. Army CECOM Center for Night Vision and Electro-Optics (C2NVEO) maintains a terrain board for the purpose of testing and evaluating Automatic Target Recognizers (ATRs). A combination ground truth and image truth procedure has been devised which minimizes the number of location measurements made, thus reducing set-up time. Reference points are ground truthed using lasers mounted on optical benches on the north and east edges of the terrain board. The program uses the measured ground and image location of two targets (reference points), combined with a digital map of the region in question, to calculate the camera azimuth, elevation, and roll angles. Thereafter the program calculates the ground location of any target given the image location using a simple ray trace procedure. Since the ground truthing of a target is much more time intensive than the image truthing, a great deal of time is saved if there are more than two targets. An elegant user interface allows the operator to display the current image, mark the image location of each target with a mouse, and have the program display the ranges to each target. This procedure has dramatically reduced the personnel required to conduct a test. The ray tracing procedure can also be applied to field testing with some modifications. In order to increase the maximum range at which targets can be viewed within the confines of the terrain room, a mirror has recently been added. The ground truthing procedure for the mirror is discussed.

Citation Download Citation

Sandor Z. Der, G. John Dome, and Gerald A. Rusche "Technique for ground/image truthing using a digital map to reduce the number of required measurements", Proc. SPIE 1483, Signal and Image Processing Systems Performance Evaluation, Simulation, and Modeling, (1 July 1991); https://doi.org/10.1117/12.45739

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KEYWORDS

Cameras

Ray tracing

Mirrors

Automatic target recognition

Digital imaging

Target recognition

Device simulation

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