US5016103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatial scan converter with vertical detail enhancement
Assignee: Zenith Electronics LLC
•
Filing: 1989-08-17
•
Granted: 1991-05-14
•
Expires: 2009-08-17
Abstract
Abstract A scan arrangement supplies real line video pixel information to an input demultiplexer that samples the pixels at a frequency of 4fc (fc=color subcarrier) and sequentially writes the sampled information in a series of line memories at an H (horizontal frequency) rate. A plurality of output multiplexers read information from the line memories at a 2H rate and supply it to a video interpolator where interpolated lines are produced based upon immediately adjacent real lines. The video output is at a 2H rate and consists of alternate real and interpolated lines in two successive fields. A vertical detail enhancement circuit combines pixel data from each set of three successive lines (upper (u), lower (l) and middle (m) lines) in accordance with the formula 2m-(u+1), to develop a vertical detail component.
Inventors
- 👤 Khosro M. Rabii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N7/00; H04N7/01; H04N7/0117; H04N7/012; H04N9/00; H04N9/64; H04N9/646; Y; Y10; Y10S; Y10S348/00; Y10S348/91
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
123 words
A method of operating an interlaced video scanning system comprising the steps of: writing successive lines of real video information into memory at a line frequency rate 1 H; reading stored video information from said memory at a line frequency rate 2 H; developing interpolated lines of video information based upon real video information from immediately adjacent lines; processing successive ones of said lines of real video information with a vertical detail component developed according to the relationship K[2m-(u+l)], where m, u and l are successive video upper, middle and lower lines and K is a constant, to enhance vertical detail; and making the enhanced real video lines and the interpolated video lines available for display at a line frequency rate 2 H.
Claim 2
Independent Claim
123 words
A method of operating an interlaced video scanning system comprising the steps of: writing successive lines of real video information into memory at a line frequency rate 1 H; reading stored video information from said memory at a line frequency rate 2 H; developing interpolated lines of video information based upon real video information from immediately adjacent lines; processing successive ones of said lines of real video information with a vertical detail component developed according to the relationship K[2m-(u+l)], where m, u and l are successive video upper, middle and lower lines and K is a constant, to enhance vertical detail; and making the enhanced real video lines and the interpolated video lines available for display at a line frequency rate 2 H.
Claim 3
Dependent Claim
123 words
A scanning system having two interlaced fields of horizontal lines comprising: first multiplexer means; memory means; means for writing successive lines of real video pixel information to said memory means at an H rate under sampling control of said first multiplexer means; second multiplexer means for reading out said real video pixel information from said memory means at a 2 H rate; interpolation means for combining said real video pixel information from said memory means to produce interpolated lines of video pixel information intermediate said real lines; means for vertically enhancing transients occurring among successive lines of said real video pixel information; and means for producing video data for display in a format of alternating lines of real and interpolated video pixel information.
Claim 4
Dependent Claim
123 words
A scanning system having two interlaced fields of horizontal lines comprising: first multiplexer means; memory means; means for writing successive lines of real video pixel information to said memory means at an H rate under sampling control of said first multiplexer means; second multiplexer means for reading out said real video pixel information from said memory means at a 2 H rate; interpolation means for combining said real video pixel information from said memory means to produce interpolated lines of video pixel information intermediate said real lines; means for vertically enhancing transients occurring among successive lines of said real video pixel information; and means for producing video data for display in a format of alternating lines of real and interpolated video pixel information.
Claim 5
Dependent Claim
23 words
The system of claim 2 wherein said interpolation means comprises means for averaging corresponding pixels in successive lines of real video pixel information.
Claim 6
Dependent Claim
43 words
The system of claim 3 wherein said means for vertically enhancing operates to develop a vertical detail signal according to the relationship K[2m-(u+l)], where m, u and l are successive real video pixel upper, middle and lower lines and K is a constant.
Claim 7
Dependent Claim
151 words
In combination: first multiplexer means for receiving video information in the form of a series of pixels at a 1 H line frequency; line memory means coupled to said first multiplexer means for storing successive lines of real video pixel information; second multiplexer means coupled to said line memory means for reading out real video pixel information therefrom at a 2 H line frequency; interpolation means coupled to said second multiplexer means for developing lines of interpolated video pixels at a 2 H line frequency by combining immediately adjacent lines of real video pixel information; and vertical detail enhancement means for processing successive groups of lines of real video pixel information to enhance transitions therebetween, said vertical detail enhancement means developing a vertical detail component VD based upon the relationship K[2m-(u+l)], where m, u and l are successive real video pixel upper, middle and lower lines and K is a constant.
Claim 8
Dependent Claim
151 words
In combination: first multiplexer means for receiving video information in the form of a series of pixels at a 1 H line frequency; line memory means coupled to said first multiplexer means for storing successive lines of real video pixel information; second multiplexer means coupled to said line memory means for reading out real video pixel information therefrom at a 2 H line frequency; interpolation means coupled to said second multiplexer means for developing lines of interpolated video pixels at a 2 H line frequency by combining immediately adjacent lines of real video pixel information; and vertical detail enhancement means for processing successive groups of lines of real video pixel information to enhance transitions therebetween, said vertical detail enhancement means developing a vertical detail component VD based upon the relationship K[2m-(u+l)], where m, u and l are successive real video pixel upper, middle and lower lines and K is a constant.
Claim 9
Dependent Claim
35 words
The combination of claim 5 wherein said first multiplexer means samples said pixels at a first rate and said second multiplexer means reads out pixel information from said memory means at twice said first rate.
Claim 10
Dependent Claim
26 words
The combination of claim 6 in a color television receiver having a color subcarrier frequency fc and wherein said first rate is equal to 4 fc.
Claim 11
Independent Claim
137 words
A method of operating an interlaced video scanning system comprising the steps of: writing successive lines of real video information into memory at a line frequency rate 1 H; reading stored video information from said memory at a line frequency rate 2 H; developing interpolated lines of video information based upon real video information from immediately adjacent lines; processing successive ones of said lines of real video information only to enhance vertical detail therein by developing a detail component according to the relationship K[2m-(u+l)], where m, u and l are successive real video upper, middle and lower lines and K is a constant and using the detail component to enhance said real video lines; and making both said enhanced real video lines and said interpolated video lines available for display at a line frequency rate 2 H.
Claim 12
Independent Claim
137 words
A method of operating an interlaced video scanning system comprising the steps of: writing successive lines of real video information into memory at a line frequency rate 1 H; reading stored video information from said memory at a line frequency rate 2 H; developing interpolated lines of video information based upon real video information from immediately adjacent lines; processing successive ones of said lines of real video information only to enhance vertical detail therein by developing a detail component according to the relationship K[2m-(u+l)], where m, u and l are successive real video upper, middle and lower lines and K is a constant and using the detail component to enhance said real video lines; and making both said enhanced real video lines and said interpolated video lines available for display at a line frequency rate 2 H.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |