Filter circuit of the median type for video signals

Details Filter circuit of the median type for video signals Filter circuit of the median type for video signals

1991-01-11

1992-09-15

Razavi, Michael

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 514, H04N 5208

Patent

active

051482789

ABSTRACT:
For filter video signals a median selector is used to the inputs of which the sample values of a first pixel and other neighboring pixels. These other pixels lie in the line direction (horizontal) and in a direction perpendicular thereto (vertical) next to the first pixel. The filtering is improved if at least one additional pixel is provided in each of those directions, providing a cruciform filter window. A still further improvement is provided if pixels which immediately preceed or follow the first pixel in the time-dimension (i.e. pixel values from a previous or following picture) are also supplied to the median selector. By utilizing interpolated sub-pixels close to the central or first pixel, disturbances, not only from noise or drop-out, but also from chrominance cross-talk, can be mitigated or avoided.

REFERENCES:
patent: 4573070 (1986-02-01), Cooper
patent: 4661853 (1987-04-01), Roeder et al.
patent: 4682230 (1987-07-01), Perlman et al.
patent: 4720745 (1988-01-01), DeForest et al.
patent: 4736439 (1988-04-01), Hay
patent: 4782389 (1988-11-01), Maymeather, III
patent: 4800511 (1989-01-01), Tanaka
patent: 4989090 (1991-01-01), Campbell et al.
IEEE Transactions on Communications, vol. Com-35, No. 6, Jun., 1987, "Adaptive Median Filtering for Impulse Noise Elimination in Real-Time TV Signals", S. Perlman, pp. 646-652.
IEEE Transactions Consumer Electronics, vol. 34, No. 1, Feb., 1988, "A VLSI Median Filter for Impulse Noise Elimination in Composite or Component TV Signals", L. A. Christopher, pp. 262-267.
Signal Processing (1989) 217-224, "A Variable Median Filter for Image Restoration Adaptable to Different Types of Spike Noise", R. Kutka, pp. 217-224.
Digitale Bildverarbeitung, by Peter Haberacker, published by Carl Hanser Verlag in 1989, pp. 139-142.

Affiliated with

Also associated with

Rating

Filter circuit of the median type for video signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Filter circuit of the median type for video signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter circuit of the median type for video signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-740880