Marker processing method, marker processing device, marker, object having a marker, and marker processing program

• US 8,971,569 B2
• Filed: 04/29/2014
• Issued: 03/03/2015
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Inazumi, Mitsuhiro
• Primary Examiner(s): Allison, Andrae S
• Application Number:
  US14/264,203
• Publication Number:
  US 20140231521A1
• Time in Patent Office: 308 Days
• Field of Search: None
• US Class Current: 382/100
• CPC Class Codes: G06K 19/06037 multi-dimensional coding
• CPC Class Codes: G06K 7/1443 locating of the code in an image
• CPC Class Codes: G06V 10/44 Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components

Abstract

A marker processing method includes: (a) binarizing a shot image; (b) labeling one or more constituents of the image detected based on the image binarized in step (a); (c) obtaining a region centroid of each of the constituents corresponding to the respective labels processed in step (b); (d) obtaining a degree of overlap of the region centroids of the constituents corresponding respectively to the labels, obtained in step (c); and (e) detecting a marker based on the degree of overlap of the region centroids obtained in step (d).

Claims

1. A marker processing method comprising:

obtaining a region centroid of each of one or more constituents extracted from an image;

obtaining a degree of overlap of the obtained region centroids; and

determining that a marker is included in the image when the degree is equal to or more than 3.

2. A marker processing device comprising:

a region centroid obtaining unit that obtains a region centroid of each of one or more constituents extracted from an image;

a region centroid multiplicity obtaining unit that obtains a degree of overlap of the obtained region centroids; and

a marker determination unit that determines that a marker is included in the image when the degree is equal to or more than 3.