Dual band progressive scan television system with noise reduction

Assignee: Technicolor USA Inc

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Filing: 1992-01-24

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Granted: —

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Expires: 2012-01-24

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Abstract

Abstract A non-interlaced video input signal (Y2) provided by a source (510) is applied to a first processor (20, 30, 40) for producing a first video output signal (Y10) having a high frequency component (Y11) subjected to coring and having a first low frequency component (Y12) subjected to frame recursive filtering. The first processor also provides a plurality of further low frequency frame recursively filtered output signals (Y18, Y20) having differing delays (1-H, 263-H) relative to said first low frequency component. A second processor (50), responsive to the frame recursively filtered low frequency components, provides a video difference signal (Y26) representative of a difference between a low frequency component (Y9) derived from a current line of the video input signal and a second low frequency component (Y24) derived from at least one previous line of the video input signal. An output circuit (60) selectively combines the video difference signal (Y26) and the first video signal (Y10) to provide a noise reduced progressive scan (non-interlaced) video output signal (Y15) in which high frequency components thereof are noise reduced by coring and low frequency components thereof are noise reduced by frame recursive filtering.

Inventors

👤 J. Christopher Todd

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-09 18:48

CPC Classifications

H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/012; H04N5/00; H04N5/14; H04N5/21

Claims Analysis

Total Claims: 4

Claim 1

Independent Claim 215 words

A progressive scan converter, comprising a source (510) for providing a non-interlaced video input signal (Y2) and means for forming a noise reduced progressive scan output signal, characterized by: a first processor (20, 30, 40) responsive to said non-interlaced video input signal (Y2) for producing a first video output signal (Y10) having a high frequency component (Y11) subjected to coring and having a first low frequency component (Y12) subjected to frame recursive filtering, said first processor also providing a plurality of further low frequency frame recursively filtered output signals (Y18, Y20) having differing delays (1-H, 263-H) relative to said first low frequency component; a second processor (50), responsive to the frame recursively filtered low frequency components for providing video difference signal (Y26) representative of a difference between a low frequency component (Y9) derived from a current line of the video input signal and a second low frequency component (Y24) derived from at least one previous line of the video input signal; and an output circuit (60) for selectively combining the video difference signal (Y26) and the first video signal (Y10) to provide a noise reduced progressive scan (non-interlaced) video output signal (Y15) in which high frequency components thereof are noise reduced by coring and low frequency components thereof are noise reduced by frame recursive filtering.

Claim 2

Dependent Claim 138 words

A progressive scan processor as recited in Claim 1 characterized in that said first processor (20, 30, 40) comprises: a filter (20) for splitting said input signal (Y2) into a low frequency component (Y4) and a high frequency component (Y3); a frame recursive filter 30 responsive to said low frequency component (Y4) for providing a plurality of frame recursively filtered output signals having respective delays of zero lines (Y9), one line (Y18), one field (Y20) and one frame (Y6); and a coring and low frequency signal substitution circuit (40) comprising a coring circuit responsive to said high frequency component (Y3) for providing a cored high frequency component (Y11) and an adder (46) for adding said frame recursively filtered undelayed low frequency component (Y9) to said cored high frequency component (11) for providing said first video output signal (Y10).

Claim 3

Dependent Claim 166 words

A progressive scan processor as recited in Claims 1 or 2 characterized in that said second processor (50) comprises: a motion detector (53) responsive to said non-delayed and said frame delayed frame recursively filtered low frequency signals (Y9 and Y6) for providing a motion indicating signal (M); a line averageing circuit (51) for averaging the non-delayed and one line delayed lines (Y9 and Y18) of said plurality of frame recursively filtered signals to provide an averaged frame recursively filtered signal (Y20); a soft switch (52) responsive to said motion indicating signal (M or K) for selectively blending said line averaged and said field delayed signals (Y22 and Y20) to provide a motion compensated, recursively filtered, low frequency output signal (Y24); and a subtractor (55) for subtracting said non-delayed frame recursively filtered low freqnecy component from said motion compensated component (Y24) to provide a frame recursively filtered low frequency video difference signal (Y26) corresponding to said second low frequency component (Y26) provided by said second processor. .

Claim 4

Dependent Claim 91 words

A progressive scan processor as recited in any of Claims 1-3 characterized in that said output circuit (60) comprises: a pair of speed-up circuits (61, 62) for doubline the line rates of said first video output signal (Y10) and said video difference signal (Y26); an adder (64) having a first input coupled to receive said double line rate first video output signal and a second input coupled via a switch (65) for receiving said video difference signal, and having an output for providing said noise reduced progressive scan output signal (Y15).

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