Patent US5077681A successfully refreshed from Google Patents.
US5077681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for source image transformation
Assignee: International Business Machines Corp
•
Filing: 1989-03-13
•
Granted: 1991-12-31
•
Expires: 2009-03-13
Abstract
Abstract Image processing apparatus for performing transformation from a source image to a target image along a number of consecutive lines parallel to a coordinate axis of the source image of said target image. The apparatus includes a point generator that sequentially determines target image points near a desired hyperbola, and outputs a number of lattice points as an approximation of the hyperbola. The apparatus maps between coordinates of pixels of the source image and coordinates of pixels of the target image based on the output of the points generator; and determines pixel values of the target image based on results of the mapping and the values of source image pixels.
Inventors
- 👤 Atsushi Miyazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:14
CPC Classifications
G; G06; G06T; G06T3/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
Image processing apparatus for performing transformation from a source image to a target image along a plurality of consecutive lines parallel to one of the coordinate axes of said source image or said target image, comprising: a point generator that sequentially determines points near a desired hyperbola and distributed along said hyperbola, and outputs a plurality of determined lattice points as an approximate curve of said hyperbola; mapping means for determining a mapping between coordinates of pixels of said source image and coordinates of pixels of said target image based on the output of said point generator; and means for determining values of each of said pixels of said target image based on said mapping and values of one of said pixels of said source image mapped to said target image.
Claim 2
Dependent Claim
131 words
Image processing apparatus for performing transformation from a source image to a target image along a plurality of consecutive lines parallel to one of the coordinate axes of said source image or said target image, comprising: a point generator that sequentially determines points near a desired hyperbola and distributed along said hyperbola, and outputs a plurality of determined lattice points as an approximate curve of said hyperbola; mapping means for determining a mapping between coordinates of pixels of said source image and coordinates of pixels of said target image based on the output of said point generator; and means for determining values of each of said pixels of said target image based on said mapping and values of one of said pixels of said source image mapped to said target image.
Claim 3
Dependent Claim
122 words
Image processing apparatus according to claim 1 wherein said desired hyperbola lies in a plane defined by said coordinate axes, said plane being divided into eight equal octants, and wherein, when sequentially determining each point constituting a part of said approximate curve, said point generator generates a plurality of candidate adjacent points in each of a plurality of directions according to the octant to which a just determined point belongs, said candidates representing a part of said approximate curve following said just determined point; and wherein said point generator determines one of said candidate points to be a part of said approximate curve following said just determined point based on the distance between each of said candidate points and said desired hyperbola.
Claim 4
Dependent Claim
27 words
Image processing apparatus according to claim 2, wherein said point generator performs said determination of said selected point based on the distance by using a recurrence formula.
References Cited (Backward Citations)
US4005258A
Cited
US4343037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |