Method and system for determining edge line in QR code binary image

Patent metadata

Field	Value
Publication number	US-9087253-B2
Application number	US-201314101947-A
Country	US
Kind code	B2
Filing date	Dec 10, 2013
Priority date	Sep 29, 2013
Publication date	Jul 21, 2015
Grant date	Jul 21, 2015

Abstract

Method and system for determining QR code binary image is provided. Locating lines on which edges of the QR code locate are determined according to location information of locating points within the QR code image and distances between the locating points to edges of the QR code. Distances may be used to obtain locating lines on which edges of the QR code locate, with relatively smaller errors. When a QR code image is distorted, it generally bulges outward. The position of a determined locating line is within the interior of the QR code image, and an actual edge of the QR code partly overlaps with the locating line and partly locate on external side of locating line. Edge points on external side of a locating line are detected along the direction of the locating line and then are connected to form an edge line of QR code.

First claim

What is claimed is:

1. A method for determining edge lines of a QR code binary image comprising:
obtaining location information of locating points within the QR code image;
determining locating lines, on which edges of the QR code locate according to the location information and to distances from the locating points to edges of the QR code;
detecting pixels adjacent to at least one of the locating lines;
obtaining a detection line for each one of the detected pixels, the det…

Assignees

• Univ Peking Founder Group Co
• Founder Mobile Media Technology Beijing Co Ltd

Inventors

• Zhang Ling
• Guan Chao
• Liu Zhenhua
• Liu Gezhang
• Che Wanyi

Classifications

• G06K7/1452 Primary

  Physics · mapped topic

• G06K7/1417

  Physics · mapped topic