Digital scan converter with programmable transfer function

Details Digital scan converter with programmable transfer function Digital scan converter with programmable transfer function

1978-03-07

1980-07-08

Smith, Jerry

Boots, shoes, and leggings

358112, 358166, 358167, G06F 1520, H04N 514

Patent

active

042120721

ABSTRACT:
A digital scan converter is provided with a programmable transfer function for video display of picture elements (pixels) using a main random access memory for storing a pixel array to be read out periodically for display, and to be selectively read out while scanning for updating with a value derived from an auxiliary random access memory addressed by the composite of an old pixel value to be updated and the new pixel value. Each memory location of the auxiliary memory stores a value derived from a table defining the transfer function desired for the entire range of new and old pixel values. An alternate transfer function is stored in a second block of the memory and selectively called out by a prefix set to a 1 or 0 in the most significant bit position of the composite address word.

REFERENCES:
patent: 3800078 (1974-03-01), Cochran et al.
patent: 3920889 (1975-11-01), Connor
patent: 3961133 (1976-06-01), Bennett
patent: 4058001 (1977-11-01), Waxman
patent: 4058836 (1977-11-01), Drewery et al.
patent: 4099179 (1978-07-01), Hofstein

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