• The KIPS Transactions:PartB
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• v.15B no.4
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• pp.259-268
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• 2008

In an effort to increase the data capacity of one-dimensional symbology, 2D barcodes have been proposed a decade ago. In this paper, we present an effective 2D barcode detection algorithm from gray-level images, especially for the handheld 2D barcode recognition system. To locate the symbol inside the image, a criteria based on the block contrast is adopted, and a gray-scale projection with sub-pixel operation is utilized to segment the symbol precisely from the region of interest(ROI). Finally, the segmented ROI is normalized using the inverse perspective transformation for the following decoding processes. We also introduce the post-processing steps for decoding the QR-code. The proposed method ensures high performances under various lighting/printing conditions and strong perspective deformations. Experiments shows that our method is very robust and efficient in detecting the code area for the various types of 2D barcodes in real time.

• Journal of the Korea Society of Computer and Information
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• v.10 no.5 s.37
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• pp.103-108
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• 2005

In this Paper, we proposed a novel robust watermarking technique using PIM and 2D barcode for the copyright of the digital images. Because human is impervious to the change in the complex area, the embedding watermark to the selected coefficients using PIM enhances invisibility. A 2D barcode image is used for watermark in this research. The 2D barcode contains more information than conventional ID barcode and includes the error correction algorithm. Therefore the watermarking algorithm using 2D barcode enhances the robustness of watermark. From the experimental results , the proposed algorithm shows better invisibility and robustness performance in a general signal Processing such as JPEG and SPIHT lossy compression.

• Journal of the Korean Society for Library and Information Science
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• v.44 no.2
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• pp.309-331
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• 2010

In this study, the characteristics and types of 1D, 2D barcodes were examined. It is necessary to provide mobile services by making full use of the advantages of the technologies, such as 1D, 2D barcodes, and RFID, and by complementing the disadvantages of them mutually in Korea. Especially, in a mobile environment where the spread of smart phones and mobile networks are expanding, barcodes and RFID (Radio-Frequency Identification) were analyzed as a very useful information media which is able to connect offline analogue media and online digital media. In addition, library automation systems and the cases of mobile student ID services using barcodes and RFID in Korean libraries were analyzed. The cases of mobile services using barcodes in foreign countries were also analyzed. With these cases, we propose a method to empower mobile services using barcodes in Korean libraries.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.183-186
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• 2003

The system realization of 2D barcode electrothermal printer for the adapted scanner recognition is presented. The 2D barcode leads the horizontal and vertical definition to recognize the scanner being an important part in system. The high definition electrothermal printer of 300dpi resolution used power historic control technique to vertical and horizontal coordinate is realized. The result of experiment is that the system enhances the quality of print image to require recognizing 20 barcode.

• Journal for History of Mathematics
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• v.21 no.2
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• pp.103-118
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• 2008

Barcode technology is becoming an essential tool for every companies, and this makes help us to gain time, analysis of goods, an inventory control, a prevention of burglar and so on. In this paper, we have treated about the history of barcode, its error correcting using the check digit, and the present and future of barcode. We wish roles of mathematician on new barcode system which it bring on an economical efficiency and stability.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.1001-1002
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• 2017

2차원 바코드는 1차원 바코드의 데이터 용량의 한계를 극복하여 최근 많이 사용되고 있다. 복잡한 환경에서 바코드의 인식을 위해서는 바코드 영역 검출이 중요한 단계이다. 본 논문에서는 딥러닝 기법을 이용하여 QR코드 검출 시스템을 구현한다. 실험은 실생활에서 카메라로 촬영한 바코드 영상을 이용한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.2C
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• pp.167-172
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• 2008

Since a 2-dimensional (2D) bar code can retrieve data and information quickly, it is widely used and recognized as a useful tool for many industrial applications. However, the information capacity of the 2D bar code is still limited. Recently the analog-digital code (AD code), which has the largest storage capacity yet contained in a code, has been developed, thereby expanding the bar code's application range because it overcomes the limitation of data capacity. In this paper, we present the AD code and implement an effective embedded system which can transform text information into voice using the 2D AD code and Text To Speech (TTS). This voice information can also be transmitted to blind people as well as the old by capturing the AD code on paper or in books.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2001.06a
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• pp.351-355
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• 2001

2차원 바코드는 2차원인 점자식 코드로서 낮은 공간점유, 높은 정보, 다양한 정보처리 기능이 가능한 차세대 라벨링 기법이다. 즉, 2차원(2D) 심볼로지는 양축(X 방향, Y 방향)으로 데이터를 배열시켜 평면화 시킨것으로서 기존의 일차원(1D) 바코드 심볼로지가 가지는 문제점인 데이터 표현의 제한성, 즉 선적용 패키지와 같은 로트 번호, 구매 주문 번호, 수취자, 수랑 기타 정보 등의 다양한 내용을 바코드로 표현하여 대상물에 부착하거나 동반시킴으로써 1750년대 중반에 등장하게 되었고, 현재 많은 부분에서 사용하고 있다. 본 논문에서는 현재 많이 쓰이는 2 차원 바코드 중 하나인 Data Matrix 의 구성과 디코딩 알고리즘을 제안한다. Data Matrix는 데이터를 효율적으로 나타내기 위하며 각 정보의 교환에 따라 다른 인코딩 방식을 사용하고 있다. 디코딩 알고리즘은 그에 따라서 구현되었다.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.6
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• pp.825-830
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• 2010

Generally, the copy protection mark and 2D bar-code techniques are widely used for forgery protection in printed public documents. But, it is hard to discriminate truth from the copy documents by using exisiting methods, because of that existing 2D-barcode is separated from the copy protection mark and it can be only recognized by specified optical barcord scanner. Therefor, in this paper, we proposed the forgery protection tehchnique for discriminating truth from the copy document by using watermark inserted 2D-barcord, which can be accurately distinguished not only by naked eye, but also by scanner. The copy protection mark consists of deformed patterns that are caused by the lowpass filter characteristic of digital I/O device. From these, we verified the performance of the proposed techniques by applying the histogram analysis based on the original, copy, and scanned copy image of the printed documents. Also, we suggested 2D-barcord confirmation system which can be accessed through the online server by using certification key data which is detected by web-camera, cell phone camera.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.3
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• pp.276-281
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• 2019

Food printers must use food ink cartridges approved by the Ministry of Food and Drug Safety (MFDS). A 2D bar code is used to read whether the ink cartridge is authentic. However, since the dye is diverged by heat pressure and printed, the barcode is contaminated. In this paper, we propose a pre-processing algorithm to solve the problem of barcode contamination by food coloring dust in a latte art printer. The algorithm is based on various morphological operations. We apply this algorithm before reading contaminated barcode images with a general QR code reader. It has been confirmed that, as compared with the existing QR code reader, the contamination rate that can be perceived is increased from 25% to 40% and even at a contamination rate of 45%, the recognition rate reaches 50%.