Efficient median filter and method therefor

Details Efficient median filter and method therefor Efficient median filter and method therefor

1995-03-03

1998-01-13

Ngo, Chuong Dinh

Boots, shoes, and leggings

G06F 700

Patent

active

057085951

ABSTRACT:
An efficient method and apparatus of median filtering includes a memory circuit (305) for holding a list of N data samples (109). A grading circuit (309, 321, 313, 311) identifies a first data sample of the N data samples that has a first metric with a magnitude less than or equal to (N-1)/2, and a second metric with a magnitude greater than or equal to (N-1)/2. The first metric is indicative of a quantity of data samples, exclusive of the first data sample, that have a magnitude less than a magnitude of the first data sample. The second metric is indicative of a quantity of data samples, exclusive of the first data sample, that have a magnitude less than or equal to the magnitude of the first data sample.

REFERENCES:
patent: 5044194 (1991-09-01), James et al.
patent: 5138567 (1992-08-01), Mehrgardt
patent: 5144568 (1992-09-01), Glover
patent: 5426785 (1995-06-01), Coffield
IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-28, No. 4, Aug. 1980 (A Fast Method for Real-Time Median Filtering) by E. Ataman, Member, IEEE, V. K. Aatre, Senior Member, IEEE, and K. M. Wong.
IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-28, No. 4, Aug. 1980 (Windowless Techniques for LPC Analysis) by Thomas P. Barnwell, III.
IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-32, No. 6, Dec. 1984 (Median Filtering by Threshold Decomposition) by J. Patrick Fitch, Edward J. Coyle, and Neal C. Gallagher, Jr., Member, IEEE.
VLSI Implementation of a Fast Rank Order Filtering Algorithm by R. G. Harber, S. C. Bass, G. W. Neudeck, Mar. 26, 1985.

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