Patent US4689677A successfully refreshed from Google Patents.
US4689677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video signal processing circuits
Assignee: Sony Corp
•
Filing: 1985-10-02
•
Granted: 1987-08-25
•
Expires: 2005-10-02
Abstract
Abstract A video signal processing circuit receiving an input sample data relating to sample positions in a video field and in association with the sample data for each sample position associated z data indicating the apparent position of the sample data in a direction perpendicular to a video display of the video field, a first memory for storing the sample data relating to each sample position in the video field, a second memory for storing the z data relating to each sample position in the video field, and a comparator circuit for comparing for each sample position in the video field the value of the input said data with the z data for that sample position stored in the second memory and for supplying a write enable signal only if the value of the input z data represents a sample position in front of that represented by the stored data, the input sample data being written into the first memory and the new z data being written into the second memory under control of a write enable signal.
Inventors
- 👤 David J. Hedley
- 👤 Morgan W. A. David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:25
CPC Classifications
G; G06; G06T; G06T15/00; G06T15/10; G06T15/40; G06T15/405; H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/272
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
219 words
A video signal processing circuit: means for supplying input sample date relating to sample positions in a video field and input z data associated with each sample position which has a value indicating the apparent position of said sample data in a direction perpendicular to a two-dimensional video display of said video field; a first memory means for storing said sample data relating to each sample position in said video field; a field memory means for storing said z data relating to each sample position in said video field; means for comparing, for each said sample position in said video field, the value of input z data with the value of z data for a corresponding sample position stored in said field memory means and for supplying a write enable signal only if said value of said input z data indicates an apparent position in front of that indicated by said stored z data, relative to said direction perpendicular to said display; means to write said input sample data into said first memory means and to over-write said input z data into said field memory means under control of said write enable signal; and means for resetting said z data stored in said second memory to a zero datum value during the vertical blanking interval between successive video fields.
Claim 2
Dependent Claim
219 words
A video signal processing circuit: means for supplying input sample date relating to sample positions in a video field and input z data associated with each sample position which has a value indicating the apparent position of said sample data in a direction perpendicular to a two-dimensional video display of said video field; a first memory means for storing said sample data relating to each sample position in said video field; a field memory means for storing said z data relating to each sample position in said video field; means for comparing, for each said sample position in said video field, the value of input z data with the value of z data for a corresponding sample position stored in said field memory means and for supplying a write enable signal only if said value of said input z data indicates an apparent position in front of that indicated by said stored z data, relative to said direction perpendicular to said display; means to write said input sample data into said first memory means and to over-write said input z data into said field memory means under control of said write enable signal; and means for resetting said z data stored in said second memory to a zero datum value during the vertical blanking interval between successive video fields.
Claim 3
Dependent Claim
31 words
A circuit according to claim 1 wherein said first memory means comprises a pair of memories which are alternately written in and read from in alternate ones of successive video fields.
Claim 4
Dependent Claim
21 words
A circuit according to claim 2 wherein said field memory means is associated with both memories of said pair of memories.
Claim 5
Dependent Claim
46 words
A circuit according to claim 1 wherein said input sample data relating to sample positions in a video field comprises data relating to a video sample at a sample position and x and y data indicating a location of said sample position in said video display.
Claim 6
Dependent Claim
44 words
A circuit according to claim 4 further comprising a first latch circuit for latching said x and y data for supply to said first memory means and a second latch circuit for latching said input z data for supply to said field memory means.
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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |