JPS57182877A - Detection system for angle change of outline edge - Google Patents

Detection system for angle change of outline edge

Info

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
Application number
JP56067029A
Other languages
Japanese (ja)
Inventor
Hiromi Nanba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56067029A priority Critical patent/JPS57182877A/en
Publication of JPS57182877A publication Critical patent/JPS57182877A/en
Pending legal-status Critical Current

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.
JP56067029A 1981-05-06 1981-05-06 Detection system for angle change of outline edge Pending JPS57182877A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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