Two-dimensional bar code identification method and system based on connected domain
A two-dimensional barcode and recognition method technology, applied in the field of barcode recognition, can solve problems such as uneven illumination, influence on recognition rate, and existence of inclination, and achieve the effects of reducing uneven illumination, improving recognition rate, and improving detection speed
Active Publication Date: 2016-08-17
广州市意芯微电子有限公司
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[0003] The QR code pictures obtained from the terminal generally have uneven lighting, additional background, and tilt. If these pictures are still processed according to the traditional recognition process, the recognition rate will be greatly affected.
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[0104] Aiming at the problems of low recognition rate and poor real-time performance in the prior art, the present invention proposes a two-dimensional barcode recognition method based on a connected domain. The main implementation process of this method includes the following steps:
[0105] (1) Grayscale and binarize the color image containing the two-dimensional code obtained from the terminal to obtain a binary image.
[0106] After the QR code image is acquired from the terminal, the acquired color image needs to be converted into a grayscale image first. The grayscale image may be affected by factors such as uneven illumination, background, and inclination. Therefore, in order to ensure the quality of the image, the present invention also needs to use the Otsu method to perform binarization processing on the image.
[0107] (2) Negate the binary image and divide the connected area, and then mark the divided connected area.
[0108] In the binary image, black is the tar...
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The invention discloses a two-dimensional bar code identification method and system based on a connected domain. The method comprises the following steps: performing gray processing and binary processing on a color image including a two-dimensional code, obtained from a terminal to obtain a binary image; performing inversion and connected region division on the binary image, and then marking a divided connected region; according to the value and the length of the connected region, searching for a QR-code finding pattern, and then according to coordinates of the QR-code finding pattern, determining a minimum area comprising the finding pattern; and in the minimum area comprising the finding pattern, by use of an improved KMP algorithm, searching for a center coordinate point of the QR-code finding pattern, and according to the searched center coordinate point, performing image correction and two-dimensional bar code identification. According to the invention, through the method of performing the binary processing and performing image correction according to the searched center coordinate point, the identification rate is improved; and at the same time, by use of the improved KMP algorithm, the pattern detection speed is high, and the real-time performance is good. The method and system provided by the invention can be widely applied to the field of bar code identification.
Description
technical field [0001] The invention relates to the field of barcode identification, in particular to a two-dimensional barcode identification method and system based on a connected domain. Background technique [0002] Two-dimensional barcode identification technology belongs to graphic identification technology, which has a wide range of applications in logistics, bills, mobile payment and other fields. Two-dimensional code is different from one-dimensional code. It stores information in both horizontal and vertical directions, with a large amount of information storage, a variety of storage types, high storage density, and good security, and its content can be obtained without going online. Therefore, the current graphic identification technology mainly uses two-dimensional codes. QR Code, the English full name of Quick Response Code (that is, the quick response matrix code), is one of the most representative two-dimensional barcodes at present. It was developed by Denso...
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IPC IPC(8): G06K9/00G06K9/36G06K7/10
CPCG06K7/10G06V10/20G06F18/00
Inventor 胡建国李仕仁林格白大伟吴江旭洪佳欣
Owner 广州市意芯微电子有限公司