JPS57182877A - Detection system for angle change of outline edge - Google Patents
Detection system for angle change of outline edgeInfo
- Publication number
- JPS57182877A JPS57182877A JP56067029A JP6702981A JPS57182877A JP S57182877 A JPS57182877 A JP S57182877A JP 56067029 A JP56067029 A JP 56067029A JP 6702981 A JP6702981 A JP 6702981A JP S57182877 A JPS57182877 A JP S57182877A
- Authority
- JP
- Japan
- Prior art keywords
- code
- quadrant
- angle change
- intra
- memory
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/46—Descriptors for shape, contour or point-related descriptors, e.g. scale invariant feature transform [SIFT] or bags of words [BoW]; Salient regional features
Landscapes
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Analysis (AREA)
Abstract
PURPOSE:To detect accurately the angle change of an outline edge, by obtaining a quadrant code and an intra-quadrant direction code indicating the direction of a unit string from the direction vector of the unit string. CONSTITUTION:A direction code converting circuit 9 converts the coordinate code read out from a coordinate memory 1 to a quadrant code and an intra- quadrant direction code and supplies these codes to a direction memory 2. The direction of a unit string is indicated by the quadrant code and the intra- quadrant direction code, and 360 deg. is divided equally into four in the quadrant code, and one quadrant is divided into (12) in the intra-quadrant direction code. An angle change calculating circuit 10 obtains the angle change of the unit string on a basis of the quadrant code and the intra-quadrant direction code read out from the direction memory 2 and supplies an angle change code to an angle change memory 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56067029A JPS57182877A (en) | 1981-05-06 | 1981-05-06 | Detection system for angle change of outline edge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56067029A JPS57182877A (en) | 1981-05-06 | 1981-05-06 | Detection system for angle change of outline edge |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57182877A true JPS57182877A (en) | 1982-11-10 |
Family
ID=13333041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56067029A Pending JPS57182877A (en) | 1981-05-06 | 1981-05-06 | Detection system for angle change of outline edge |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57182877A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0520458A (en) * | 1991-02-25 | 1993-01-29 | Matsushita Electric Works Ltd | Corner position detection method |
WO1993007580A1 (en) * | 1991-10-02 | 1993-04-15 | Fujitsu Limited | Method of determining direction in local region of profile segment and method of determining lines and angles |
-
1981
- 1981-05-06 JP JP56067029A patent/JPS57182877A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0520458A (en) * | 1991-02-25 | 1993-01-29 | Matsushita Electric Works Ltd | Corner position detection method |
WO1993007580A1 (en) * | 1991-10-02 | 1993-04-15 | Fujitsu Limited | Method of determining direction in local region of profile segment and method of determining lines and angles |
US5586199A (en) * | 1991-10-02 | 1996-12-17 | Fujitsu Limited | Method for determining orientation of contour line segment in local area and for determining straight line and corner |
US5870494A (en) * | 1991-10-02 | 1999-02-09 | Fujitsu Limited | Method for determining orientation of contour line segment in local area and for determining straight line and corner |
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