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  本文選題：二維碼　切入點：數(shù)字水印　出處：《中南林業(yè)科技大學(xué)》2015年碩士論文

【摘要】：QR碼具有糾錯能力強、容量大、易于識別等優(yōu)點,是條碼家族優(yōu)秀的一員,且應(yīng)用最為廣泛。但是,由于QR碼也是采用公開的編碼模式,缺少嚴格意義上的防偽方法,使它在保密性方面略顯不足。數(shù)字水印技術(shù)利用了視覺冗余將秘密信息隱藏在數(shù)字媒體中,而使人們無法感知信息嵌入后媒體數(shù)據(jù)的差異。因此,結(jié)合數(shù)字水印技術(shù)和二維條碼技術(shù),能夠很大程度上的提升二維條碼在防偽方面的應(yīng)用。二維條碼和水印結(jié)合主要有兩種方法,根據(jù)結(jié)合方式的不同可以生成條碼水印或水印條碼。條碼水印是將二維條碼作為水印然后嵌入到載體中,其主要利用二維條碼糾錯性能好、譯碼能力強的特點。水印條碼即以文本或者圖像作為水印信息,經(jīng)過處理后嵌入二維碼中。本文針對二維條碼在實際應(yīng)用中存在的安全問題,分析了QR碼的優(yōu)勢以及其在應(yīng)用中存在的問題,深入剖析了QR碼的結(jié)構(gòu)以及編碼解碼流程,設(shè)計了一種變換域QR碼水印。該方法結(jié)合離散小波變換與奇異值分解將水印信息嵌入到QR碼中,并采用混沌加密、信息隱藏等技術(shù)得到水印條碼。實驗結(jié)果表明,本文提出的水印算法在不影響QR碼正確識別的前提下,具有良好的安全性和魯棒性。最后,結(jié)合本文提出的QR碼水印算法,設(shè)計了一套基于QR碼的防偽系統(tǒng),并將其應(yīng)用在物流防偽子系統(tǒng)中。通過需求分析、數(shù)據(jù)庫設(shè)計、環(huán)境搭建,到手機客戶端與后臺服務(wù)器端的設(shè)計,最終實現(xiàn)對物流信息的管理與調(diào)度,保證物流信息的準確性和安全性。
[Abstract]:QR codes have the advantages of strong error-correcting ability, large capacity, easy recognition and so on. QR codes are excellent members of bar code family and are widely used. However, because QR codes are also used in public coding mode, there is a lack of anti-counterfeiting methods in strict sense. Digital watermarking technology makes use of visual redundancy to hide secret information in digital media, which makes people unable to perceive the difference of media data after information is embedded. The combination of digital watermarking technology and two-dimensional bar code technology can greatly enhance the application of two-dimensional bar code in anti-counterfeiting. Barcode watermark or watermark bar code can be generated according to the different combination mode. Bar code watermarking is to use two-dimensional bar code as watermark and then embed it into carrier, which mainly uses two-dimensional bar code to correct errors. The watermark bar code, which takes text or image as watermark information, is embedded into two-dimensional code after processing. This paper aims at the security problems of two-dimensional bar code in practical application. This paper analyzes the advantages of QR code and the problems in its application, and deeply analyzes the structure of QR code and the process of encoding and decoding. In this paper, a transform domain QR code watermark is designed, which combines discrete wavelet transform and singular value decomposition to embed watermark information into QR code. Chaotic encryption and information hiding techniques are used to obtain the watermark bar code. The proposed watermarking algorithm has good security and robustness without affecting the correct recognition of QR code. Finally, a set of anti-counterfeiting system based on QR code is designed by combining the proposed watermarking algorithm of QR code in this paper. Through requirement analysis, database design, environment construction, to the design of mobile phone client and background server, the management and scheduling of logistics information is realized. Ensure the accuracy and safety of logistics information.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TP391.44;TP309.7

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本文編號：1666616