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1. CN111931538 - Positioning method of Micro QR two-dimensional code

Office
China
Application Number 202010643510.6
Application Date 07.07.2020
Publication Number 111931538
Publication Date 13.11.2020
Publication Kind A
IPC
G06K 7/14
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
14using light without selection of wavelength, e.g. sensing reflected white light
G06T 7/13
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
7Image analysis
10Segmentation; Edge detection
13Edge detection
G06T 5/00
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
5Image enhancement or restoration
CPC
G06K 7/1417
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns;
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
14using light without selection of wavelength, e.g. sensing reflected white light
1404Methods for optical code recognition
1408the method being specifically adapted for the type of code
14172D bar codes
G06K 7/1452
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns;
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
14using light without selection of wavelength, e.g. sensing reflected white light
1404Methods for optical code recognition
1439including a method step for retrieval of the optical code
1452detecting bar code edges
G06K 7/1443
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
7Methods or arrangements for sensing record carriers, ; e.g. for reading patterns;
10by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
14using light without selection of wavelength, e.g. sensing reflected white light
1404Methods for optical code recognition
1439including a method step for retrieval of the optical code
1443locating of the code in an image
G06T 7/13
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
7Image analysis
10Segmentation; Edge detection
13Edge detection
G06T 5/002
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
5Image enhancement or restoration
001Image restoration
002Denoising; Smoothing
G06T 2207/20032
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
2207Indexing scheme for image analysis or image enhancement
20Special algorithmic details
20024Filtering details
20032Median filtering
Applicants OPT MACHIINE VISION TECH CO., LTD.
广东奥普特科技股份有限公司
Inventors CHEN YUQUAN
陈余泉
LU SHENGLIN
卢盛林
Agents 天津市北洋有限责任专利代理事务所 12201
天津市北洋有限责任专利代理事务所 12201
Title
(EN) Positioning method of Micro QR two-dimensional code
(ZH) 一种Micro QR二维码的定位方法
Abstract
(EN) The invention belongs to the technical field of two-dimensional codes, and particularly relates to a Micro QR two-dimensional code positioning method, which comprises the steps of 1, performing edge detection on a Micro QR two-dimensional code image, and extracting all contours according to a connected domain after the connected domain is acquired; 2, selecting a rectangular connected domain fromall contours obtained in the step 1, and determining the center of a rectangular positioning block; 3, according to the proportional relation of the two-dimensional code positioning blocks, the accurate coordinates of the centers of the positioning blocks are calculated; and 4, taking the central point of the positioning block as a starting point, respectively obtaining boundary points in the horizontal direction and boundary points in the vertical direction of the code area along the horizontal direction and the vertical direction of the clock area, and determining the code area boundary of the Micro QR two-dimensional code according to the two boundary points and the central point of the positioning block. By means of the method, the problem that the Micro QR two-dimensional code cannotbe positioned or is not accurate enough is effectively solved.
(ZH) 本发明属于二维码技术领域,具体涉及一种Micro QR二维码的定位方法,包括步骤1、对Micro QR二维码图像进行边缘检测,获取连通域后,再根据连通域提取所有轮廓;步骤2、从步骤1中得到的所有轮廓中挑选出矩形连通域,确定矩形定位块中心;步骤3、根据二维码定位块的比例关系,计算出定位块中心的精确坐标;步骤4、以定位块的中心点为起点,分别沿时钟区的水平和垂直方向获取码区的水平方向的边界点和垂直方向的边界点,并根据这两个边界点和定位块的中心点,确定Micro QR二维码的码区边界。通过该方法有效解决了Micro QR二维码无法定位或定位不够准确的问题。
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