Interlaced-to-progressive scanning converter with a double-smoot

Details Interlaced-to-progressive scanning converter with a double-smoot Interlaced-to-progressive scanning converter with a double-smoot

1994-06-03

1996-01-30

Kostak, Victor R.

Television

Format conversion

Line doublers type

348607, H04N 701

Patent

active

054884217

ABSTRACT:
An interlaced-to-progressive scanning converting apparatus for double-smoothing which prevents picture deterioration wherein the scanning method for a television signal is converted from an interlaced scanning method into a progressive scanning method, and a method therefor. The apparatus includes a double-smoothing circuit including a median-filter for median-filtering an interlaced scanning signal, a censoring circuit for censoring the median-filtered signal according to predetermined bias values, an order statistics filter (OSF) for setting a predetermined weighing coefficient according to the censored signal. The apparatus further includes an interlaced-to-progressive converter for converting the double-smoothed interlaced scanning signal into a progressive scanning signal. The apparatus and corresponding method, thus, prevent picture deterioration phenomena such as inter-line flickering, line crawling or stepped-shaped edges.

REFERENCES:
patent: 4682230 (1987-07-01), Perlman et al.
patent: 5049993 (1991-09-01), LeGall et al.
patent: 5175619 (1992-12-01), Willis
"Interlaced to Progressive Conversion by Median Filtering", Capodiferro, Third International Workshop on HDTV, vol. III, Aug. 30-Sep. 1, 1989, Torino, Italy.
"A Generalization of Median Filtering Using Linear Combinations of Order Statistics", Bovik et al., IEEE Transactions on Acoustics, Speech, & Signal Processing, vol. ASSP-31, No. 6, Dec. 1983, pp. 1342-1349.
"Applications of Nonlinear Smoothing Algorithm to Speech Processing", Rabiner et al., IEEE Transactions on Acoustics, Speech, & Signal Processing, vol. ASSP-23, No. 6, Dec. 1975, pp. 552-557.

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