發(fā)布時間：2018-10-21 09:05

【摘要】：隨著我國經(jīng)濟和科技的飛速發(fā)展，人們的生活水平也在不斷的提高，日常生活中現(xiàn)金流通也越來越頻繁。與此同時，制、販假幣的現(xiàn)象也越來越多，且呈上升趨勢。盡管驗鈔機的功能在不斷的升級，可是隨著高科技的發(fā)展，假幣的制作技術(shù)也在逐步提高，造假的仿真程度讓人防不勝防。現(xiàn)在所有的基于工藝型的紙幣防偽技術(shù)很難滿足實際需求。因此，紙幣防偽技術(shù)的改進勢在必行。 目前，現(xiàn)有市場生產(chǎn)的自動的驗鈔機，只能驗鈔和識別真?zhèn)危隍炩n過程中，所產(chǎn)生的帶菌灰塵，沒有處理，既使設(shè)有除塵引風(fēng)機和存灰盒，但是，帶菌灰塵很容易擴散傳播，危害工作人員的身體健康。在網(wǎng)上查詢和實地考察，目前市場未發(fā)現(xiàn)帶有除塵消毒裝置的驗鈔機。為了人們的身體健康，帶有除塵消毒裝置驗鈔機的制造、推廣、應(yīng)用非常必要。 紙幣的防偽是世界各國金融系統(tǒng)都面臨的十分重要又棘手的問題，本文在保留了紙幣原有防偽功能的基礎(chǔ)上，提出了一種將數(shù)字化的QR Code二維碼與數(shù)字水印技術(shù)相結(jié)合的新型的數(shù)字化防偽技術(shù)。利用RSA加密算法對紙幣代碼進行加密，，并生成二維碼。最后利用DWT域水印算法嵌入和提取水印圖像。仿真實驗結(jié)果證明了該技術(shù)的有效性。 數(shù)字化水印技術(shù)應(yīng)用到紙幣防偽中,是將QR Code二維碼圖形作為數(shù)字水印，經(jīng)Arnold變換置亂后嵌入到紙幣中。依據(jù)人類視覺的差異，應(yīng)該選擇小波系數(shù)變化比較大的位置嵌入QR Code二維碼圖形，嵌入該圖形的強度應(yīng)按照小波系數(shù)的大小，自適應(yīng)的嵌入到低頻域當(dāng)中，并且采用基于ARM11的嵌入式系統(tǒng)作為數(shù)字化水印的檢測裝置以提取QR Code二維碼圖形。實驗表明該算法在確保紙幣水印不可見性的同時，具有較強的抗噪聲能力，對紙幣的污損、剪切、噪聲等操作具有較好的魯棒性。 二維條碼應(yīng)用到紙幣防偽中,是將紙幣號碼先進行加密，將加密碼再編碼生成碼字序列及糾錯碼，最終形成二維碼圖形，掩碼之后再用數(shù)字化水印技術(shù)嵌入到紙幣中。提取的時候，就是嵌入的逆過程，先提取出水印圖形，再進行二維碼譯碼，最后辨別真?zhèn)巍?最后本文在以上技術(shù)的基礎(chǔ)上應(yīng)用了紫外殺菌技術(shù)，將具有寬紫外波段的LED燈加到該系統(tǒng)中，實現(xiàn)了數(shù)字化水印、二維碼防偽和殺菌為一體的驗鈔技術(shù)。
[Abstract]:With the rapid development of economy and science and technology in our country, people's living standard is improving constantly, and cash circulation is becoming more and more frequent in daily life. At the same time, the system, the phenomenon of counterfeit money also more and more, and an upward trend. Although the function of the detector is constantly upgrading, but with the development of high technology, the production technology of counterfeit coins is also gradually improved, the simulation degree of counterfeiting is difficult to prevent. Now all the technology-based paper money security technology is very difficult to meet the actual needs. Therefore, the improvement of paper currency security technology is imperative. At present, the automatic cash detector produced in the existing market can only check and identify the authenticity and authenticity of the banknote. During the process of checking the banknote, the bacteria dust produced has not been dealt with, even though there are dust traps and ash storage boxes, but the dust with bacteria spreads easily. Endanger the health of the staff. On-line inquiry and field inspection, the market has not found a dusting and disinfection device with a cash detector. For the sake of people's health, it is necessary to manufacture and popularize the cash detector with dust-removing and sterilizing device. The security of banknotes is a very important and difficult problem that the financial systems of all countries in the world are facing. This paper retains the original anti-counterfeiting function of banknotes. This paper presents a new digital anti-counterfeiting technology which combines digital QR Code two-dimension code with digital watermarking technology. RSA encryption algorithm is used to encrypt the banknote code and generate the two-dimensional code. Finally, the watermark image is embedded and extracted using DWT domain watermarking algorithm. Simulation results show the effectiveness of this technique. The digital watermarking technology is applied to the paper currency security. The QR Code two-dimensional code graph is used as the digital watermark, which is embedded in the paper currency by Arnold transform scrambling. According to the difference of human vision, we should choose the position in which the wavelet coefficients change greatly and embed the QR Code two-dimensional code figure. The intensity of embedding the image should be adaptively embedded into the low frequency domain according to the size of the wavelet coefficient. And the embedded system based on ARM11 is used as the detection device of digital watermark to extract QR Code two-dimensional code graphics. Experiments show that the proposed algorithm not only ensures the invisibility of banknote watermark, but also has a strong anti-noise ability, and is robust to the operation of paper currency such as filth, shear and noise. In the application of two-dimensional bar code to banknote security, the paper currency number is encrypted first, and the code sequence and error-correcting code are generated by adding the cipher code to generate the code sequence and error correction code. Finally, the two-dimensional code graph is formed, and then the mask is embedded into the banknote by digital watermarking technology. When extracting, it is the inverse process of embedding. Firstly, the watermark is extracted, then decoded by two-dimensional code, and finally the true and false are identified. Finally, based on the above technology, the ultraviolet sterilization technology is applied, and the LED lamp with wide ultraviolet band is added to the system, which realizes the digital watermark, the anti-counterfeiting of two-dimensional code and the sterilizing technology.
【學(xué)位授予單位】：大連工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH693.5

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