發(fā)布時(shí)間：2018-04-19 06:05

  本文選題：包裝印刷防偽 + 全息半色調(diào)水印�。� 參考：《湖南工業(yè)大學(xué)》2014年碩士論文

【摘要】：本文將全息數(shù)字水印、多媒體認(rèn)證等數(shù)字領(lǐng)域的防偽技術(shù)引入到包裝印刷品防偽領(lǐng)域，并結(jié)合包裝印刷防偽的實(shí)際需要，對(duì)包裝印刷全息水印防偽中全息水印算法、圖像幾何失真校正和圖像識(shí)別驗(yàn)證等問題進(jìn)行了研究。 適用于彩色印刷圖像的全息水印算法是實(shí)現(xiàn)包裝印刷制品全息水印防偽認(rèn)證的基礎(chǔ)和前提。本文針對(duì)印刷工藝特點(diǎn)，將誤差擴(kuò)散半色調(diào)、傅里葉全息和離散Haar小波變換引入數(shù)字水印防偽系統(tǒng)中，設(shè)計(jì)了用于彩色印刷品的全息半色調(diào)水印算法。通過打印/印刷—掃描實(shí)驗(yàn)，采用NC、PSNR和印刷品色差值等圖像質(zhì)量評(píng)價(jià)手段，得出：對(duì)于彩色印刷圖像（CMYK印刷色彩模式），在宿主圖像顏色分量較多的通道內(nèi)嵌入傅里葉全息半色調(diào)水印，水印嵌入強(qiáng)度在1~1.5時(shí)，可獲得質(zhì)量可靠的全息水印印刷防偽圖像。 對(duì)防偽印刷圖像進(jìn)行幾何失真校正是獲得良好水印圖像的必要手段。本文利用Hough變換、傾斜角計(jì)算、透視變換公式等方法對(duì)防偽圖像進(jìn)行幾何校正，然后采用數(shù)學(xué)形態(tài)學(xué)方法對(duì)校正后的圖像進(jìn)行修正，取得了很好的校正效果，保證了水印信息的順利提取和水印圖像的質(zhì)量。 圖像識(shí)別驗(yàn)證是全息水印防偽信息認(rèn)證的核心。對(duì)從防偽印刷圖像中提取出的水印圖像進(jìn)行必要的預(yù)處理，，并按類別進(jìn)行了研究，分別采用相關(guān)系數(shù)、圖像區(qū)域特征方法重點(diǎn)對(duì)字母數(shù)字類、幾何圖形類水印進(jìn)行了識(shí)別驗(yàn)證。結(jié)果表明，上述方法能實(shí)現(xiàn)對(duì)印刷圖像全息半色調(diào)水印的識(shí)別驗(yàn)證，同時(shí)也驗(yàn)證了本文所提出的傅里葉半色調(diào)水印防偽方案可用于包裝印刷品防偽認(rèn)證。 最后，運(yùn)用全息半色調(diào)水印算法設(shè)計(jì)防偽包裝盒并進(jìn)行印刷實(shí)驗(yàn)。采用本文提出的幾何校正及圖像識(shí)別驗(yàn)證方法對(duì)包裝盒進(jìn)行防偽認(rèn)證，進(jìn)一步驗(yàn)證了本文所述方法用于印刷包裝制品防偽的可行性和可靠性，為包裝印刷品全息水印防偽認(rèn)證平臺(tái)的建立和實(shí)用化打下了良好的基礎(chǔ)。
[Abstract]:In this paper, the anti-counterfeiting technology in digital field such as holographic digital watermark and multimedia authentication is introduced into the field of packaging printing anti-counterfeiting, and the holographic watermarking algorithm in packaging printing holographic watermark is combined with the actual need of packaging printing anti-counterfeiting.Image geometric distortion correction and image recognition verification are studied.The holographic watermarking algorithm suitable for color printing image is the foundation and prerequisite for the authentication of packaging printing product holographic watermark.According to the characteristics of printing technology, this paper introduces error diffusion halftone, Fourier holography and discrete Haar wavelet transform into digital watermarking anti-counterfeiting system, and designs a holographic halftone watermarking algorithm for color printing.Through printing / printing scanning experiment, the image quality evaluation methods such as NCP-PSNR and printing color difference were used.It is concluded that for color printing image CMYK color mode, Fourier holographic halftone watermark can be embedded in the channel with more color components of host image. When the embedding intensity of watermark is between 1 and 1.5, the quality and reliability of holographic watermark printing and anti-counterfeiting image can be obtained.Geometric distortion correction of anti-counterfeiting printed image is necessary to obtain good watermark image.In this paper, Hough transform, tilt angle calculation and perspective transformation formula are used for geometric correction of anti-false image, and then mathematical morphology method is used to correct the corrected image, and good correction effect is obtained.It ensures the smooth extraction of watermark information and the quality of watermark image.Image recognition and verification is the core of holographic watermark authentication.The watermark image extracted from the anti-counterfeiting printing image is preprocessed and studied according to the category. The correlation coefficient and the image region feature method are used to identify the watermark of alphanumeric and geometric images respectively.The results show that the above method can recognize and verify the holographic halftone watermark of printed image, and it also verifies that the proposed Fourier halftone watermarking scheme can be used for packaging anti-counterfeiting authentication of printed materials.Finally, the holographic halftone watermarking algorithm is used to design the anti-counterfeiting packaging box and carry out printing experiment.The method of geometric correction and image recognition is used to authenticate the box, and the feasibility and reliability of the method for anti-counterfeiting of printed packaging products are further verified.It lays a good foundation for the establishment and practicability of packaging print holographic watermark authentication platform.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB481

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 童立靖;張艷;舒巍;占國亮;錢W

本文編號(hào)：1771887