The Air Force Research Laboratory Information Directorate (AFRL/IF), under sponsorship of the Department of Justice's (DOJ), National Institute of Justice (NIJ) Office of Science and Technology (OS&T), is currently developing and evaluating advanced Through the Wall Surveillance (TWS) technologies. These technologies are partitioned into two categories: inexpensive, handheld systems for locating an individual(s) behind a wall or door; and portable, personal computer (PC) based standoff systems to enable the determination of events during critical incident situations. The technologies utilized are primarily focused on active radars operating in the UHF, L, S (ultra wideband (UWB)), X, and Ku Bands. The data displayed by these systems is indicative of range (1 Dimension), or range and azimuth (2 Dimensions) to the moving individual(s). This paper will highlight the technologies employed in five (5) prototype TWS systems delivered to NIJ and AFRL/IF for test and evaluation. It will discuss the systems backgrounds, applications, current states of evolution, and future plans for enhanced assessment.
In this paper we describe an acoustic weapons detection concept that is based on ultrasonics and nonlinear acoustics. An ultrasonic projector is used to create an acoustic field at the site of inspection. The field is composed of multiple ultrasonic waves interacting at the interrogation site. The ultrasonic field creates acoustic interactions at that site which are used as the primary probe. The acoustic field is tailored to excite the target in an optimum fashion for weapons detection. In this presentation, we present aspects of this approach highlighting its ability to confine the interrogation field, create a narrow-band probing field, and the ability to scan that acoustic field to image objects. Ultrasonic propagation parameters that influence the field will be presented as will data of field characteristics. An image obtained with this system will be shown, demonstrating its capability to achieve high resolution. Effects of cloth over a weapon are shown to alter the image, yet not hide the weapon. Luna will report on its most recent findings as to the nature of this detection technology and its ability to generate information important to CWD.
Polarization vision has recently been shown to simplify some important image understanding tasks that can be very difficult to perform with intensity vision. This, together with the more general capabilities of polarization vision for image understanding, motivates the building of camera sensors that automatically sense and process polarization information. Described in this paper is a design for a liquid crystal polarization camera sensor that has been built to automatically sense partially linearly polarized light and computationally process this sensed polarization information at pixel resolution to produce a visualization of reflected polarization from a scene and/or a visualization of physical information in a scene directly related to sensed polarization. As the sensory input to polarization camera sensors subsumes that of standard intensity cameras, they can significantly expand the application potential of computer vision for object detection. A number of images taken with polarization cameras are presented showing potential applications to image understanding, object recognition, circuit board inspection, and marine biology.
Conference Committee Involvement (2)
Image and Information Systems: Applications and Opportunities
12 October 1994 | Washington, DC, United States
23 Annual AIPR Workshop: Image and Information Systems: Applications and Opportunities