Patent US5329314A successfully refreshed from Google Patents.
US5329314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for video signal interpolation and progressive scan conversion
Assignee: Deutsche Thomson Brandt GmbH
•
Filing: 1993-04-09
•
Granted: 1994-07-12
•
Expires: 2013-04-09
Abstract
Abstract A video input signal is vertically interpolated and applied along with a field delayed and a field advanced video signal to respective inputs of a first median filter the output of which is applied along with a line delayed and a line advanced signal to respective inputs of a second median filter to provide an interpolated video output signal. The resultant double median filtered signal and a field delayed signal are applied via respective time compressors to a multiplex switch to provide an output signal of progressive scan form and in which every other line thereof is interpolated by double median filtering.
Inventors
- 👤 Carlos Correa
- 👤 John Stolte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:19
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/012
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
A method for interpolating a video input signal, comprising the steps of: forming a vertically interpolated signal from said video input signal; applying said vertically interpolated signal, a field delayed signal and a field advanced signal to respective inputs of a first median filter for forming a first median filtered signal; and applying said first median filtered signal, a line delayed signal and a line advanced signal to respective inputs of a second median filter for producing an interpolated video output signal subjected to double median filtering.
Claim 2
Independent Claim
87 words
A method for interpolating a video input signal, comprising the steps of: forming a vertically interpolated signal from said video input signal; applying said vertically interpolated signal, a field delayed signal and a field advanced signal to respective inputs of a first median filter for forming a first median filtered signal; and applying said first median filtered signal, a line delayed signal and a line advanced signal to respective inputs of a second median filter for producing an interpolated video output signal subjected to double median filtering.
Claim 3
Independent Claim
116 words
A method for interpolating a video input signal, comprising: forming interpolated pixel values by subjecting said video input signal to a temporal median filtering and to a vertical median filtering; selecting as inputs for said temporal median filtering input video signal pixels having the same spatial position and which are temporally adjacent to a pixel to be interpolated and a mean value from input pixels that are vertically adjacent to the pixel to be interpolated to provide a first temporal median filtered video output signal; and selecting as inputs for said vertical median filtering said vertically adjacent pixels and said temporally median filtered video signal for forming a video output signal interpolated by double median filtering.
Claim 4
Independent Claim
116 words
A method for interpolating a video input signal, comprising: forming interpolated pixel values by subjecting said video input signal to a temporal median filtering and to a vertical median filtering; selecting as inputs for said temporal median filtering input video signal pixels having the same spatial position and which are temporally adjacent to a pixel to be interpolated and a mean value from input pixels that are vertically adjacent to the pixel to be interpolated to provide a first temporal median filtered video output signal; and selecting as inputs for said vertical median filtering said vertically adjacent pixels and said temporally median filtered video signal for forming a video output signal interpolated by double median filtering.
Claim 5
Dependent Claim
31 words
A method according to claim 2 further comprising the steps of: time compressing said video input and output signals and interleaving the compressed signals to produce a progressive scan output signal.
Claim 6
Dependent Claim
20 words
A method according to claim 2 further comprising the step of selecting a chrominance signal as said video input signal.
Claim 7
Dependent Claim
20 words
A method according to claim 2 further comprising the step of selecting a luminance signal as said video input signal.
Claim 8
Dependent Claim
83 words
A method according to claim 3 wherein said video input signal comprises a luminance signal, said method further comprising the steps of time compressing said input and output signals; interleaving the compressed signals to form a luminance progressive scan output signal; providing a chrominance input signal, vertically interpolating said chrominance signal, time compressing and interleaving said chrominance input signal and said vertically interpolated chrominance signal to form a chrominance progressive scan output signal for display along with said luminance progressive scan output signal.
Claim 9
Dependent Claim
60 words
A method according to claim 3 wherein said video input signal comprises a luminance component of an interlaced video signal having also a chrominance component and further comprising the step of obtaining chrominance pixels for the progressive output signal by averaging of the chrominance pixel values vertically adjacent in the field, in conjunction with a temporal adaptional to the luminance.
Claim 10
Dependent Claim
37 words
A method according to claim 2 characterized in that for progressive scan conversion, the original pixel values of the corresponding interlace pixels are used for the pixel values of the progressive output signal in each second line.
Claim 11
Dependent Claim
132 words
An interpolator, comprising: an input from which interlace pixels are supplied to a first field buffer and to a first median filter, which also receives the output signal of a second field buffer and the output signal of an averaging circuit, the output signal of the first field buffer being supplied to a line buffer, to the first input of the averaging circuit and to a second median filter, and the output signal of the line buffer passing to the input of the second field buffer, to a second input of the averaging circuit and to the second filter which is also fed with the output signal of the first median filter, the values for the pixels of the progressive output signal being taken at the output of the second median filter.
Claim 12
Dependent Claim
132 words
An interpolator, comprising: an input from which interlace pixels are supplied to a first field buffer and to a first median filter, which also receives the output signal of a second field buffer and the output signal of an averaging circuit, the output signal of the first field buffer being supplied to a line buffer, to the first input of the averaging circuit and to a second median filter, and the output signal of the line buffer passing to the input of the second field buffer, to a second input of the averaging circuit and to the second filter which is also fed with the output signal of the first median filter, the values for the pixels of the progressive output signal being taken at the output of the second median filter.
Claim 13
Dependent Claim
73 words
A device according to claim 9, characterized in that chrominance interlace pixels are supplied to a line buffer and to the first input of an averaging circuit in conjunction with a temporal adaptation to the luminance, the output of the line buffer being connected to a second input of the averaging circuit and the values for the chrominance pixels of the progressive output signal being taken at the output of the averaging circuit.
Claim 14
Dependent Claim
89 words
Apparatus for interpolating a video input signal, comprising: first means for forming a vertically interpolated signal from said video input signal; second means for applying said vertically interpolated signal, a field delayed signal and a field advanced signal to respective inputs of a first median filter for forming a first median filtered signal; and third means for applying said first median filtered signal, a line delayed signal and a line advanced signal to respective inputs of a second median filter for producing a double median filtered video output signal.
Claim 15
Dependent Claim
89 words
Apparatus for interpolating a video input signal, comprising: first means for forming a vertically interpolated signal from said video input signal; second means for applying said vertically interpolated signal, a field delayed signal and a field advanced signal to respective inputs of a first median filter for forming a first median filtered signal; and third means for applying said first median filtered signal, a line delayed signal and a line advanced signal to respective inputs of a second median filter for producing a double median filtered video output signal.
Claim 16
Dependent Claim
56 words
Apparatus as recited in claim 11 further comprising: means for field delaying said video input signal; a time compression circuit for time compressing said double median filtered video output signal and for time compressing said field delayed video input signal; and switching means for interleaving said time compressed signals for forming a progressive scan output signal.
References Cited (Backward Citations)
DE3114275A1
Cited
EP0152738A1
Cited
DE3608917A1
Cited
US4896212A
Cited
US5001563A
Cited
US4989090A
Cited
GB2231460A
Cited
US5168358A
Cited
US5081532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |