Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1982-07-14
1985-01-22
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, 351200, 382 52, A61B 314
Patent
active
044948387
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.
REFERENCES:
Otto H. Schade, Sr., "Optical and Photoelectric Analog of the Eye", Journal of the Optical Society of America, pp. 721, 738 & 739.
Tom N. Cornsweet, "Visual Perception," Academic Press: New York, 1970.
Clarence H. Graham, "Vision and Visual Perception", cover sheet & p. 49.
Kuperman Gilbert G.
Wallquist Donald L.
Bovernick Rodney B.
Dzierzynski Paul
Franz Bernard E.
Singer Donald J.
The United States of America as represented by the Secretary of
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