Abstract: A computer implemented method and system for preparing a description of an electromagnetic scattering net approximating an actual scattering net for analyzing effect on sensor imagery is comprised of: (1) inputting a basic tent configuration comprising a number of tent poles, spacing of tent poles, a covering net, an amount of net sag, and plurality of locations of ground anchor points, representing the design variables selected by an operator from which a net can be modeled; (2) dividing the overall net shape into a plurality of large facets that describe the overall shape conforming to the basic net configuration; (3) subdividing each large facet into a plurality of small facets in accordance with the input number of small facets per large facets chosen so that the small facets correspond in wavelength to the scattering of an actual scattering net; (5) rotating each small facet to achieve an approximation of the signature reduction of an actual scattering net; and (6) outputting a description of rotated sma

Abstract: A system for simulating the display of visual images by a matrix of liquid crystal cells or other matrix elements and providing flexibility in selecting display characteristics such as element size, active area ratio, and signal noise content. The display preferably employs a cathode ray tube and uses software signal processing.

Abstract: An optical system limiting resolution determination arrangement employing sinusoidal intensity modulated bar pattern input stimuli including two sequences for determining the modulation transfer function (MTF) component of limiting resolution; one of these and the disclosed aerial image modulation (AIM) curve determination are based on sinusoidal intensity modulated bar patterns, while the other MTF determination uses a Heaviside edge function stimulus and a sinusoidally determined AIM curve. The disclosed limiting resolution is especially useful in the consideration of aerial image devices such as cameras.

Abstract: Digital apparatus for generating moving grates of stimulus modulated bar patterns is disclosed. The bar patterns are modulated according to sinusoidal or other mathematical relations and can be alternately displayed as color and/or intensity variations on the display screen. Multiple display images, operator control of grate movement, and the use of image processing apparatus are also incorporated.

Abstract: An image processing apparatus for aiding analysis of images through the introduction of additonal physically displaced image elements in complementary color which are generated by digital processing of original image elements. The added elements and original image are viewed stereoscopically on an electronic reconstructed image display.

Abstract: Flying spot scanner technology is combined with stereo photography in motion to produce two channels of video imagery which can be optically combined to produce the perception of dynamic stereoscopic detail. The scanner generates alternate lines with lateral offset corresponding to the physical separation between stereo photographic pairs to provide two rasters.

Abstract: The mapping provides a capability for quantifying an external scene in a manner equivalent to the allocation at perceptual bandwidth in the human retina. The device samples the scene, either photographically or by video; records a digital version of the scene, processes the digital version so that the effects of the distribution rods in the retina provides the weighting for allocating signal processing bandwidth differentially across the scene in accordance with human physiological data, and produces a recording of the processed digital image.The processing uses a selected acuity factor as a parameter, a neighborhood is assigned to each pixel, with a radius r equal to (1.0+(acuity factor.times.R))/2.0, where R is the distance from the center of the image. The digital values of all pixels in the neighborhood are summed and the sum is divided by the number of pixels in the neighborhood to obtain an average value. This value is then assigned to the pixel in forming a processed image frame.

Abstract: An apparatus and method for recording and reproducing extended periods of video information on a longitudinal tape recorder without losing synchronism or image quality. The composite video signal, and synchronization signals extracted therefrom, are recorded in spatial registry on separate channels of a longitudinal tape recorder/reproducer. Vertical synchronization quality is maintained by recording on a channel capable of low frequency processing. Upon reproduction all synchronization, including mixing with supplemental video sources, is synchronized to the recorded master video synchronization and blanking signals. Video display at other than normal speeds is temporally synchronized from the slower tape speed. An X-Y monitor driven by vertical and horizontal sweep signals synchronized to the corresponding recorded synchronization signals generates a video presentation without repeated or omitted frames.

Abstract: A color moving target simulation apparatus combines an enlarged color aerial photograph with a miniature moving target to achieve an accurate simulation of a real world observation from an altitude above the moving target. The color photograph is mounted on a stationary substrate and the target is attached to an endless wire which is moved across the photograph. The wire extends between parts of a motorized pulley assembly mounted on opposite ends of a arm which may be rotatably adjusted to various positions in a plane parallel to the substrate and photograph.

Abstract: An apparatus for creating images of nonperiodic patterns, which patterns are variable in contrast with respect to a uniform and constant level of background luminance. Two beams of uniform luminance are projected through individual, orthogonally oriented linear polarizers, and then into a common cube beam splitter to be divided and interlaced. One combined output beam from the splitter is projected through a rotatable linear polarizer onto the image sensing optical detector undergoing test. The second beam is projected toward a detection system. The patterned region of the second beam passes through a second rotatable linear polarizer, synchronized to the first rotatable polarizer, and onto a CCD array detector system. Contrast between the pattern and the background is represented by the two electrical voltage levels in the array output, irrespective of the spatial frequencies in the pattern.