Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1990-10-22
1991-11-12
Blum, Theodore M.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
H01J 2970, H01J 2976
Patent
active
050650769
ABSTRACT:
In a digital convergence circuit within a video display system, an interpolation circuit for multiplying first and second predetermined correction values corresponding to a pair of sample points by a plurality of respective first and second weighting coefficient values corresponding to successive additional sample points (i) intermediate the first and second sample points. Circuitry is provided for detecting the number (N) of successive additional sample points (i) and in response generating a first address signal representative thereof. Further circuitry is provided for generating successive count address signals corresponding to the successive additional sample points (i). A memory is included for receiving the first and successive count address signals and in response generating respective ones of the first weighting coefficient values .alpha. in accordance with the relation .alpha.=i/N. Additional circuitry is provided for receiving and inverting the respective ones of the first weighting coefficient values .alpha. and in response generating respective ones of the second weighting coefficient values in accordance with the relation 1-.alpha.=1-i/N.
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Blum Theodore M.
Electrohome Limited
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