Title:
INTERSECTION DETECTION DEVICE, CAMERA CALIBRATION SYSTEM, INTERSECTION DETECTION METHOD, CAMERA CALIBRATION METHOD, PROGRAM AND RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP2018088228
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an intersection detection device capable of improving detection accuracy of an intersection of a checker pattern.SOLUTION: An intersection detection device 101 includes a memory 103, and an intersection detection section 106 which reads out an image of at least a part of photographic images as a rectangular image from the memory 103, and detects an intersection of two boarder lines in a checker pattern displayed on the rectangular image. The intersection detection section 106 determines a plurality of parameters of a function model for optimizing an evaluation value based on a difference between each pixel value expressed by a functional model with a two-dimensional image coordinate as a variable and each pixel value of the rectangular image, and calculates a position of an intersection between two straight lines expressed by the plurality of determined parameters to detect the intersection with sub-pixel accuracy. The functional model represents a pixel value at each position on the two-dimensional coordinate system in a boundary between a black region and a white region with a curve that is differentiable at least once.SELECTED DRAWING: Figure 1
Inventors:
WAKAI NOBUHIKO
AZUMA TAKEO
NOBORI KAZUO
SATO SATOSHI
MARUYAMA AYAKO
AZUMA TAKEO
NOBORI KAZUO
SATO SATOSHI
MARUYAMA AYAKO
Application Number:
JP2017126841A
Publication Date:
June 07, 2018
Filing Date:
June 29, 2017
Export Citation:
Assignee:
PANASONIC IP MAN CORP
International Classes:
G06T7/80; G01B11/00; G06T5/00; H04N5/232
Domestic Patent References:
| JP2004200819A | 2004-07-15 | |||
| JP2014230215A | 2014-12-08 | |||
| JP2000350191A | 2000-12-15 |
Other References:
LUCA LUCCHESE: "Using saddle points for subpixel feature detection in camera calibration targets", CIRCUITS AND SYSTEMS, 2002.APCCAS '02.2002 ASIA-PACIFIC CONFERENCE, JPN6021011257, 28 October 2002 (2002-10-28), US, pages 191 - 195, XP010620808, ISSN: 0004476118
RADU ORGHIDAN: "Camera calibration using two or three vanishing points", PROCEEDINGS OF THE FEDERATED CONFERENCE ON COMPUTER SCIENCE AND INFORMATION SYSTEMS, JPN6021011258, 20 November 2012 (2012-11-20), US, pages 123 - 130, ISSN: 0004476119
RADU ORGHIDAN: "Camera calibration using two or three vanishing points", PROCEEDINGS OF THE FEDERATED CONFERENCE ON COMPUTER SCIENCE AND INFORMATION SYSTEMS, JPN6021011258, 20 November 2012 (2012-11-20), US, pages 123 - 130, ISSN: 0004476119
Attorney, Agent or Firm:
Hiromori Arai
Eisaku Teratani
Shinichi Michisaka
Eisaku Teratani
Shinichi Michisaka