. Airborne radar. Airplanes; Guided missiles. 636 DISPLAY SYSTEM DESIGN PROBLEMS two parts, (a) a photosensitive portion called the retina and {b) a control system for positioning the eye. The following discussion will be limited to a consideration of the retina and its characteristics that influence system design. The response of the control system will not be considered in this analysis because its characteristics manifest themselves as part of tracking behavior. The major subdivisions of the retina that can influence design are (1) the periphery and (2) the fovea or center portion. Each por
. Airborne radar. Airplanes; Guided missiles. 636 DISPLAY SYSTEM DESIGN PROBLEMS two parts, (a) a photosensitive portion called the retina and {b) a control system for positioning the eye. The following discussion will be limited to a consideration of the retina and its characteristics that influence system design. The response of the control system will not be considered in this analysis because its characteristics manifest themselves as part of tracking behavior. The major subdivisions of the retina that can influence design are (1) the periphery and (2) the fovea or center portion. Each portion has important characteristics. The center portion or fovea is color sensitive and has high resolution properties. The periphery is sensitive to very small amounts of light when the eye is dark-adapted. The basic characteristics of the eye will be considered in terms of their effect upon the performance of a simple task, the detection and resolu- tion of spots of varying size, color, and brightness under varying conditions of background brightness, exposure time, and eye adaptation time. The basic problem and the sensitive parameters to be considered are shown in Fig. 12-15. Background Brightness Spot Characteristics Size Brightness Color Exposure Time Eye Adaptation. Fig. 12-15 Sensitive Parameters of the Spot Detection and Resolution Problem. Visual acuity ( the ability to resolve small visual angles) depends upon the angular displacement from the fovea as shown in Fig. 12-16. At 10° from the fovea on the nasal side, the visual acuity is 20 per cent of the value that exists when the object falls on the fovea. (That is to say, the minimum. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Povejsil, Donald J. Princeton, N. J. , Van Nostrand
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Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectairplanes
