Single clock cycle two-dimensional median filter

Details Single clock cycle two-dimensional median filter Single clock cycle two-dimensional median filter

1995-08-14

1998-03-03

Cosimano, Edward R.

Boots, shoes, and leggings

36472401, G06F 1700

Patent

active

057242690

ABSTRACT:
A median circuit operates over a single-clock-cycle to determine the median of the group. Each value is compared with a plurality of other values. One of those other values become the eventual median. The possible median which is closest to all of the elements being compared is taken as the overall closest value and established as the median. Most specifically, this is done by applying the higher voltage of the pair to one end of a capacitor at the same time as a precharge. After the precharge is complete, the lower voltage of the pair is applied to the capacitor. The capacitor acts as a charge pump, lowering its other end by an amount proportional to the distance between the higher voltage of the pair and the lower voltage of the pair. A plurality of the capacitors are connected together, so that the output from the group of cells represents the average capacitors among all elements. The highest group represents the eventual median.

REFERENCES:
patent: 4672567 (1987-06-01), Kelly et al.
patent: 4713786 (1987-12-01), Roskind
patent: 4928258 (1990-05-01), May
patent: 4951242 (1990-08-01), Hobson
patent: 5138567 (1992-08-01), Mehrgardt
patent: 5414663 (1995-05-01), Komarek et al.

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