US5038285A
Expired / Lapsed
US
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Method for computer-generating a two-dimensional map of a three-dimensional surface
Assignee: Cornell Research Foundation Inc
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Filing: 1989-10-27
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Granted: 1991-08-06
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Expires: 2009-10-27
Abstract
Abstract A method is described for deriving a planar representation of a three-dimensional surface which includes steps of: deriving a plurality of tomographic slices of the three-dimensional surface; positioning reference points about a perimeter surface of each tomographic slice; creating a straight line representation of each perimeter surface with its reference points, each straight line representation having a length value proportional to the perimeter surface from which it was created; adjusting the straight line representations to be adjacent to each other in the order of their respective tomographic slices, to thereby create a planar map of the three-dimensional surface when the straight line representations are plotted; and reducing distortion between straight line representations by finding the average minimum distance between positionally closest reference points on adjacent slice surface lines; and repositioning the straight line representations in accordance with the findings.
Inventors
- 👤 Marc L. Jouandet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:59
CPC Classifications
G; G06; G06T; G06T17/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A method for deriving a planar representation of a three-dimensional surface, comprising the steps of: a. deriving a plurality of tomographic slices of said three-dimensional surface; b. positioning reference points about a perimeter surface of each said tomographic slice; c. creating a straight line representation of each said surface with its reference points, each said straight line representation having a length value proportional to the perimeter of the surface from which it was created; d. adjusting said straight line representations to be adjacent to each other in the order of their respective tomographic slices, to thereby create a planar map of said three-dimensional surface when said straight line representations are plotted; and e. reducing distortion between said straight line representations by finding the average minimum distance between positionally closest reference points on adjacent slice surface lines, and repositioning said straight line representations in accordance with said findings.
Claim 2
Independent Claim
147 words
A method for deriving a planar representation of a three-dimensional surface, comprising the steps of: a. deriving a plurality of tomographic slices of said three-dimensional surface; b. positioning reference points about a perimeter surface of each said tomographic slice; c. creating a straight line representation of each said surface with its reference points, each said straight line representation having a length value proportional to the perimeter of the surface from which it was created; d. adjusting said straight line representations to be adjacent to each other in the order of their respective tomographic slices, to thereby create a planar map of said three-dimensional surface when said straight line representations are plotted; and e. reducing distortion between said straight line representations by finding the average minimum distance between positionally closest reference points on adjacent slice surface lines, and repositioning said straight line representations in accordance with said findings.
Claim 3
Dependent Claim
55 words
The method of claim 1 wherein said positioning step (b) further comprises the steps of: b1. producing a plurality of nested crest outlines for each tomographic slice; and b2. assigning to each intersection of a perimeter surface of a tomographic slice and said nested crest outlines, reference points having X, Y, and Z dimension values.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein said reducing distortion step (e) further comprises the step of: e1. deriving a connection table which, for each reference point, notes the dimension values of a positionally closest reference point on an adjacent tomographic slice perimeter surface.
Claim 5
Dependent Claim
48 words
The method of claim 3 wherein said connection table includes, for each slice, a list of reference points about the perimeter surface of each slice, each reference point listing comprising three dimensional reference values and an indication of the physically closest reference point on an adjoining perimeter surface.
Claim 6
Dependent Claim
88 words
The method of claim 4, wherein said reducing distortion step (e) further comprises the steps of: e2. repetitively moving a straight line representation with respect to an adjacent straight line representation and determining for each move, the distance between positionally closest reference points on said representations; e3. ceasing said repetitive move step (e2) when a minimum value is determined between positionally closest reference points on one said straight line representation and an adjacent straight line representation; and e4. repeating steps e2 and e3 for all straight line representations.
Claim 7
Independent Claim
170 words
A method for deriving a planar representation of a three dimensional surface, such representation exhibiting a minimum distortion for a selected surface area, the method comprising the steps of: a. deriving a plurality of tomographic slices of said three-dimensional surfaces; b. positioning reference point about a perimeter surface of each said tomographic slice; c. creating a straight line representation of each said surface with its reference points, each said straight line representation having a length value proportional to the length of the perimeter surface from which it was created; d. adjusting said straight line representations so that when plotted as a planar map, they are positioned in order of their respective tomographic slices; e. determining and noting positionally closest reference points on adjacent straight line representations; f. determining a reference point positioned within said selected surface area; and g. rearranging said straight line representations to align said determined reference point and positionally closest reference points on other straight line representations whereby area distortion of said selected surface area is minimized.
Claim 8
Independent Claim
170 words
A method for deriving a planar representation of a three dimensional surface, such representation exhibiting a minimum distortion for a selected surface area, the method comprising the steps of: a. deriving a plurality of tomographic slices of said three-dimensional surfaces; b. positioning reference point about a perimeter surface of each said tomographic slice; c. creating a straight line representation of each said surface with its reference points, each said straight line representation having a length value proportional to the length of the perimeter surface from which it was created; d. adjusting said straight line representations so that when plotted as a planar map, they are positioned in order of their respective tomographic slices; e. determining and noting positionally closest reference points on adjacent straight line representations; f. determining a reference point positioned within said selected surface area; and g. rearranging said straight line representations to align said determined reference point and positionally closest reference points on other straight line representations whereby area distortion of said selected surface area is minimized.
Claim 9
Dependent Claim
55 words
The method of claim 6 wherein said positioning step (b) further comprises the steps of: b1. producing a plurality of nested crest outlines for each tomographic slice; and b2. assigning to each intersection of a perimeter surface of a tomographic slice and said nested crest outlines, reference points having X, Y, and Z dimension values.
Claim 10
Dependent Claim
39 words
The method of claim 6 wherein said reducing distortion step (e) further comprises the step of: e1. deriving a connection table which, for each reference point, notes a positionally closest reference point on an adjacent tomographic slice perimeter surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |