Real-time ordinal-value filter utilizing reference-function comp

Details Real-time ordinal-value filter utilizing reference-function comp Real-time ordinal-value filter utilizing reference-function comp

1984-01-30

1985-12-24

Chin, Gary

Communications: electrical

Digital comparator systems

364900, 382 36, G06F 706, G06K 900

Patent

active

045609748

ABSTRACT:
Operating at real-time data rates, the disclosed hardware network generates a signal which closely approximates the Mth-largest of a set of R input data signals. The operational basis of this network is a comparison (121-127) between the input data (101-107) and a monotonically-scanning reference function (110). At that point (140, 150, 160) when the lower (R-M+1) of the inputs have been equaled by an increasing reference, the reference has become the same as the Mth-largest and is used (119b, 165, 170, 175) as the filter output. Analogous operation is achieved with a decreasing reference.
When the number R of inputs is odd and M is made equal to ((R+1)/2), the network becomes a real-time median filter.

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patent: 3931612 (1976-01-01), Stevens et al.
patent: 4101968 (1978-07-01), Florence
patent: 4110837 (1978-08-01), Chen

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