Title:
EDGE ORIENTATION FOR SECOND DERIVATIVE EDGE DETECTION METHODS
Document Type and Number:
WIPO Patent Application WO/2011/115867
Kind Code:
A3
Abstract:
An improved algorithm for edge detection is provided that utilizes the second order derivative of the intensity distribution function of an image to provide edge orientation information for the detected edges. An exemplary embodiment of the improved algorithm includes determining the second order derivative of the intensity distribution function, identifying zero-crossings in the horizontal and vertical directions, assigning angle information to the identified zero-crossings in the horizontal and vertical directions; and identifying an edge orientation based the assigned angle information for the horizontal and vertical zero-crossing of the edge and adjacent edges.
Inventors:
KARANAM GOPAL (IN)
KUSSTATSCHER BENNO (DE)
KUSSTATSCHER BENNO (DE)
Application Number:
PCT/US2011/028275
Publication Date:
December 29, 2011
Filing Date:
March 14, 2011
Export Citation:
Assignee:
ANALOG DEVICES INC (US)
KARANAM GOPAL (IN)
KUSSTATSCHER BENNO (DE)
KARANAM GOPAL (IN)
KUSSTATSCHER BENNO (DE)
International Classes:
G06T7/00
Other References:
HUERTAS A ET AL: "DETECTION OF INTENSITY CHANGES WITH SUBPIXEL ACCURACY USING LAPLACIAN-GAUSSIAN MASKS", IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE, IEEE SERVICE CENTER, LOS ALAMITOS, CA, US, vol. PAMI-08, no. 5, 1 September 1986 (1986-09-01), pages 651 - 664, XP000857582, ISSN: 0162-8828, DOI: DOI:10.1109/TPAMI.1986.4767838
LONGIN JAN LATECKI: "Sliding Window Filters and Edge Detection (Passage)", 2004, pages 30 - 31, XP002642647, Retrieved from the Internet [retrieved on 20110615]
SZELISKI R: "Computer Vision: Algorithms and Applications (Passage)", 18 August 2009, pages: 261 - 262, XP002643238
LONGIN JAN LATECKI: "Sliding Window Filters and Edge Detection (Passage)", 2004, pages 30 - 31, XP002642647, Retrieved from the Internet
SZELISKI R: "Computer Vision: Algorithms and Applications (Passage)", 18 August 2009, pages: 261 - 262, XP002643238
Attorney, Agent or Firm:
RUSSELL, Steven, J. et al. (2020 K Street N, Washington DC, US)
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