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5. Dual Focal Length Split Scan Camera
A detailed design has been completed for a dual focal length
panoramic camera which can be configured into a wide variety of air-
craft installation constraints on compartment size, shape, and
window location. The use of continuous film motion and the incorporation
of a modular building block concept permits the major components to be
rearranged to fit into any reasonable aircraft compartment. The cur-
rent design uses 70 mm film with focal lengths of 38 mm and 127 mm
and provides essentially emulsion limited image quality at a relative
aperture of f/2.8. An important feature is the dual-focal length lens,
based on a novel concept which can broadly be described as the reciprocal
imaging of an object, which in this case, is the virtual image of the
ground. The lens is close to telecentric providing excellent illumi-
nation characteristics, while the distortion has still been held to a
negligible amount.
6. Extreme telephoto lens
A 61 cm focal length f/4.5 lens has been developed and produced
by Fairchild Space and Defense Systems which provides, in an extreme
telephoto form, image quality comparable to the more traditional designs
of similar complexity. The lens has been mounted for use in a split
scan camera with a two mirror fold. The first mirror splits the front
positive group and the second mirror is behind the negative group re-
flecting the image on the slit. The overall length of the folded lens
is approximately 40 cm. The lens covers a 12-degree field with no
vignetting. The distortion is less than 0.05 percent and the chromatic
correction is suitable for color film.
INTERPRETATION SYSTEMS INCORPORATED
Jerry D. Lent
The VP-8 Image Analyzer is widely used to provide density slice
and isometric views of terrain data. In early 1974, ISI completed the
design of a second stage configuration, designated SYSTEM 150, to
provide real-time interactive multiple image analysis capabilities.
The approach necessitated the development of a sophisticated analog
storage system.
In August of 1975, ISI announced a new digital product line designed
to suit a wide variety of applications in computer graphics. The line
currently includes the Video/DMA Interface Unit (VDI), a unique, low-
cost, highly interactive computer graphics peripheral which produces
dynamic color, monochrome, and pseudo 3-D images from random access
memory. The VDI is available as a peripheral for several popular
minicomputers. It can utilize either CPU main memory and/or its own
self-contained memory for image storage. Two VDI-based systems have
been announced: the System for Analysis and Display (SAND), a powerful
image processing system, and the Spatial Interactive Graphics Terminal
(SIGHT), an intelligent terminal suited for a large class of display
requirements. SAND systems include a minicomputer, conventional
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