The jnd values allow us to imperceptibly add a larger - amplitude watermark to the transform coefficients , thus the watermark will be more robust . and the watermark is a visually meaningful binary image , which will greatly facilitate the process of convincing the jury of an ownership claim 嵌入的水印是有意义的二值灰度图，这样，不仅可以通过统计来决策待检测图像中的水印有无，还可以通过提取出直观的有意义的水印来加以判断。
For the anticounterfeiting of printings ( such as certificate ) , the existent many ways ( such as rainbow holograms ) are not available as the need for special use : anti - distortion and anti - copy . basing in the double - random - phase transform , this article puts forward a new way that two - dimensional bar code is used as anticounterfeiting label with anti - printing ? scanning and anti - damage properties . the major job are : ( 1 ) . basing in the ascii codes , numerals and alphabets are encoded and subsequently transformed into two - value bar code matrix figure . later , using amplitude - based double - random - phase transform , the enciphered gray scale figure is formed . by computer simulation ( 4f system ) and printing as well as scanning ( 20 times ) , we get the result that the gray scale figure with little miscoding rate ( 0 . 0026 ) by “ matrix expanding way ” 本文主要开展了以下三项研究工作: ( 1 ) .用自定义编码方案,将数字和字母( ascii码)转换成二值条码图;对该图形进行振幅型双随机相位加密变换,得到原信息的加密灰度图;通过4f光学系统计算机模拟和打印-扫描实验,证明本文提出的“矩阵扩展法”灰度图具有较小的误码率,对于20次打印-扫描实验,误码率不大于0 . 0026 。
In this paper , based on the study of vga graphic displaying theory and the theory of synchronizing display between led large - screen display system and crt image , a method , bit plane addressing method which has good effect - . high ratio of performance to price and can be implemented easily in circuits is discussed . and the principle and the implementation of the multi - gray led display system with programmable logic devices cpld and fpga are analyzed in detail 本文在分析vga图象显示原理和led大屏幕与crt视频图像同步显示原理的基础上，论述了一种显示效果较好、性能价格比高、电路上易于实现的方法? ?位平面寻址法实现多灰度图象，并详细分析了应用复杂可编程逻辑器件cpld和在线可编程逻辑器件fpga实现多灰度彩色led大屏幕图像显示的原理及电路实现。
The main work is as follow : the pater makes use of vanguard genetic algorithms in image segmentation , uses vanguard genetic algorithms to get the image threshold . using this method we may get different grey vehicles from the background exactly . used the support vector machine theory to conduct the vehicles automatic sorting simulation research , the simulation result had proven this method could quite be accurate carries on the vehicles type the recognition ; improved based on the background automatic renewal hypothesized examination region algorithm , enhanced timeliness and the accuracy which the vehicles examines ; and to has carried on the specify based on the hypothesized examination region imagery processing algorithm realization ; in the paper also introduced withdraws the algorithm based on the gradation continuous movement vehicles characteristic to carry on the vehicles the characteristic to withdraw as well as to use the localization method which colored filter same gradation chart processing unifies to carry on the realization method which the vehicles license plate locates 本文根据智能交通控制与仿真对于交通流量、车辆到达率、车辆速度等交通信息检测的需求,基于视频图像进行了交通信息处理的算法研究与实现,主要工作包括以下几个方面:将先锋遗传算法应用到图像阈值分割中,利用先锋遗传算法寻求全局最优阈值,可以比较准确的将图像中不同灰度的车辆从背景中分离出来;采用支持向量机理论进行了车辆自动分类的仿真研究,仿真结果证明该方法能够比较准确的将车辆的类型进行识别;改进了基于背景自动更新的虚拟检测区域算法,提高了车辆检测的实时性和准确性;并对基于虚拟检测区域的图像处理算法实现进行了详细说明;论文中还介绍了基于灰度连续性的运动车辆特征提取算法进行车辆的特征提取以及采用彩色过滤器同灰度图处理相结合的定位方法进行车辆牌照定位的实现方法。
In the detection and extraction of license plate region , at first , a color filter is designed according to the background color of lp . if this method failed , then a method based on gray image segmentation is applied . pc simulating results are also given 对车牌区域的检测，本文将基于彩色过滤和基于灰度图纹理的车牌区域检测技术联合起来，设计了车牌区域定位方案，并详细分析了车牌区域粗定位的软件实现，最后对车牌粗定位方案进行了pc仿真，得到了较好的实验结果。
But , though considerable process has been made in the last ten years , digital watermarking is still in its infancy , and much interesting work remains to be done this thesis addresses some problems in the gray - scale image digital watermarking that are summarized below : 1 ) whereas the basic theory of digital watermarking is still very poor , a digital watermarking mathematic model based on imperceptibility and robustness is presented by analysising the characteristic of digital watermarking ; 2 ) based on the model constructed above , by defining the measures of capacity and robustness of digital watermarking , an objective method for evaluating the digital watermarking is introduced and used to analysis some algorithms ; 3 ) whereas geometric distortion always influences the restoration of watermark , we advocate to enhance the robustness against geometric distortion by restoring the image which has been distorted by geometric transformation , and a method is designed for estimating the parameters of geometric transformation ; 4 ) based on the conclusion discussed above , and combined with the masking effects of hvs , a novel public meaningful gray - scale image digital watermarking is designed by analysising the characteristics of image gray - scale interpolation and haar wavelet transformation . the experimental results show that the method is indeed powerful ; 5 ) whereas many image digital watermarking schemes , which embed watermark by modifying the values of pixels in spatial domain and transformed domain , are confronted with the conflict between the imperceptibility and robustness , we advocated to use some stable digital characteristics of host image as watermark and a algorithm based on hermite matrix is designed 本文重点对灰度图象数字水印技术进行研究，主要工作如下： 1 )鉴于目前数字水印的理论研究比较薄弱的现状，本文通过分析数字水印的特点，建立了一个数字水印的数学模型，为进一步研究数字水印打下了基础； 2 )根据以上建立的模型，通过引入容量和稳健度的概念为数字水印提供了一个客观评价方法，并对一些数字水印算法进行了分析； 3 )为增强数字水印抵抗几何攻击的能力，研究了受几何攻击的图象的复原问题，并给出了一个计算图象几何变换参数的方法； 4 )通过分析图象灰度插值算法和haar小波变换的特点，结合hvs的掩蔽效应，设计了一个公开的有意义数字水印算法，实验结果表明本算法具有较强的稳健性； 5 )目前许多水印算法都是通过在空域或频域修改象素值的方法嵌入水印的，这种方法面临着透明性和稳健性的矛盾，为解决这个矛盾，本文提出以图象的某些稳定的数字特征为水印的观点，并结合hermite矩阵的特点设计了相应的水印算法，实验结果表明该算法具有较好的稳健性。
In this dissertation , we study the technologies and application of multimedia information security in the area of digital watermarking . the main contributions of this dissertation are : a newly watermarking algorithm with gray - level image based on dwt and svd is proposed : now , most of the watermarking algorithms hide the random signal or two - value image into the image ; only a few watermarking algorithms hide the gray - level image into the image . in my dissertation , we study the algorithm that hides the gray - level image into the image and gain some result 提出了一种基于dct和svd的一种灰度水印嵌入算法：现在大部分的数字水印技术所嵌入的水印一般是随机信号或者是二值图象，那么用有意义的灰度图象作为水印信号的嵌入技术很少见，本人所提出的这种算法对这方面的技术进行了尝试，提出了一种基于dct和svd的灰度水印嵌入算法，这种算法的先进之处就是嵌入的水印信息是信息量很大的灰度图象。
In the skeleton extraction , an novel approach for extracting the skeletons directly from the gray images is developed by simulating the procedure of water eroding the topography surface . the resultant skeletons are single - pixel width and connected . it also lies in the middle line of the object and keeps the topological properties of the original image unchanged 在骨架提取方面，论文提出了一种通过模拟水流冲刷地形表面的过程来直接从灰度图象中提取目标的骨架的高效算法，它可以得到连通的、保持目标的拓扑属性的、处在目标的中线上的、近似单象素宽度的骨架。
Second , the pretreatment of digital watermarking data is discussed one by one , and their shortcomings and excellence are also pointed out . third , many kinds of embedding technology of digital watermarking data is analyzed carefully , and their powers to resist some kinds of attacks arc introduced . then , two new embedding technologies about gray digital watermarking are suggested , based on dwt and dct separately 在介绍数字水印的相关概念、特点和应用领域的基础上，对水印信号的数据预处理进行了系统的论述，并指出各种常用方法的优缺点；其次对水印信号的嵌入技术进行了翔实分析，并分析了各类嵌入方法的抗攻击能力；随后提出了两种分别基于dwt和dct变换的嵌入灰度图水印的新方法，加以实现并对实验结果和算法性能进行初步分析讨论。
After processing original data , characteristics were extracted using four kinds of methods . these characteristics include tabulated data extracting from pattern , statistics , fractal parameter using gridding methods and moment features . bp artificial network is used to classify different kinds of discharge 本文采用四种方法对实验获取的局部放电样本提取了局部放电的特征量，主要提取了局部放电的三维谱图表列数据、统计特征、分形特征和局部放电灰度图象的矩特征这四种特征量。
