CN102682239A - Digital watermark technology based copyright protection method orienting to remote sensing tile data - Google Patents

Digital watermark technology based copyright protection method orienting to remote sensing tile data Download PDF

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CN102682239A
CN102682239A CN 201210139422 CN201210139422A CN102682239A CN 102682239 A CN102682239 A CN 102682239A CN 201210139422 CN201210139422 CN 201210139422 CN 201210139422 A CN201210139422 A CN 201210139422A CN 102682239 A CN102682239 A CN 102682239A
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China
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remote sensing
watermark
image
watermark information
sensing data
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CN 201210139422
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Chinese (zh)
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任娜
崔翰川
朱一姝
朱长青
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常熟南师大发展研究院有限公司
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Publication of CN102682239A publication Critical patent/CN102682239A/en

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Abstract

The invention discloses a digital watermark technology based copyright protection method orienting to remote sensing tile data. According to the method, based on the analysis of the characteristics of the remote sensing tile data and the requirements of the remote sensing tile data for copyright protection, watermark information is not lost in the spliced watermark-containing remote sensing data and is only changed in coordinate positions, and the synchronization relationship between raw data and the watermark information is effectively guaranteed by virtue of an established watermark embedding rule. During watermark detection, image blocks containing the watermark information are rapidly and accurately located by adopting a golden section method search mechanism, and the watermark information is extracted from the image blocks. According to the copyright protection method disclosed by the invention, the characteristics of pixel values of the remote sensing tile data before and after splicing are fully utilized to realize the correct extraction of the watermark information subjected to splicing, so that the robustness of a watermark algorithm is greatly increased, the problem that the tile data cannot resist splicing attacks at present is solved, and the copyright of the tile data is protected effectively.

Description

基于数字水印技术的针对瓦片遥感数据的版权保护方法 Copyright protection method for digital watermarking technology tile remote sensing data

技术领域 FIELD

[0001] 本发明属于地理信息版权保护领域,具体涉及一种针对瓦片遥感影像数据的采用黄金分割法的数字水印方法,以提高遥感影像数字水印算法抗拼接能力,实现瓦片遥感数据的版权保护。 [0001] The present invention pertains to GIS Rights copyright protection, and in particular relates to a method for watermarking a golden section method of remote sensing data against the tile, in order to improve anti remote sensing image watermarking algorithm splicing ability to achieve remote sensing data tile protection.

背景技术 Background technique

[0002] 随着网络技术的发展,地理数据的应用更加广泛,许多网站如百度、谷歌等都提供电子地图服务,特别是以Google Earth为代表的地理数据发布软件的大众化,极大地推动 [0002] With the development of network technology, application of geographic data more widely, many sites such as Baidu, Google and so provide web mapping, especially in the Google Earth geographic data as the representative of popular publishing software, which greatly promoted

了地理信息产业的发展。 The development of geographic information industry. 我国也在大力发展网络地理信息服务,国家测绘地理信息局联合全国各省市开发了“天地图”网站,积极推动了地理信息资源共建共享,在很短时间内,实现了全国多尺度、多类型的资源综合利用和在线服务,开通4天访问人数就高达460多万人次。 China is also to develop a network of geographic information services, National Mapping Geographic Information Bureau of the provinces and municipalities jointly developed the "world map" website, actively promote the sharing of geographic information resources, in a very short period of time to achieve a nationwide multi-scale, multi type of comprehensive utilization of resources and online services, opening up four days the number of visitors more than 460 million people. 目前,网络环境下地理数据服务呈现迅猛发展态势。 Currently, geographic data service network environment showing rapid development momentum.

[0003] 网络环境下地理数据通常是以切片的形式存放于服务端,切片大小是256X256的像素。 [0003] geographic data network environment usually in the form of slices stored in the server, the size of a slice of 256X256 pixels. 瓦片金字塔是一种多分辨率数据模型,其核心是分层和分块,将原始数据按照不同分辨率重采样产生新的图层,同一图层按指定的网格大小进行均匀剖分即得瓦片。 Is a multi-resolution pyramid tile data model, and the core is a layered block, according to the raw data of different resolutions generated resampling new layer, the same layer uniformly split the specified grid size i.e. have tiles. 首先是将原始的影像数据建立影像金字塔,然后将每个级别影像金字塔按照固定的大小生成瓦片遥感数据,以图片文件的形式存储在服务器的硬盘目录下。 The first is the original image data to establish the image of the pyramid, then each level of the pyramid image generation tile remote sensing data in accordance with a fixed size, in the form of image files stored in the hard disk directory server. 系统根据用户选择范围加载瓦片遥感数据,比传统的实时渲染方式响应速度更快,更加方便快捷,是目前网络环境中常用方法。 The system loads the user the choice of tile remote sensing data than traditional real-time rendering to respond faster, more convenient, is the method commonly used in the network environment. 瓦片遥感数据还具有数据量巨大、更新快特点,例如“天地图”网站,主节点与分节点的总瓦片数高达百亿片。 Tile remote sensing data also has a huge amount of data, fast update features, such as the total number of tiles "world map" website, the master node with sub-nodes up to ten billion. 但是,这种瓦片储存方式的数据存在一个致命弱点,即是十分易于下载,以致目前地理数据非法下载、非法使用、非法谋利等安全问题日益严重和突出,严重危害了数据拥有者的权益,扰乱了地理信息产业的正常发展。 However, the data stored in this way the tiles there is a fatal weakness, that is very easy to download, so that the current geographic data illegal downloading, illegal use, illegal profit and other security issues become increasingly prominent and serious, serious harm to the interests of the data owner disrupt the normal development of geographic information industry. 采用有效的技术手段保护网络环境下瓦片遥感数据的版权是目前迫切需要解决的问题。 Effective use of technical means to protect the tile under the network environment remote sensing data of copyright is an urgent need to address the problem.

[0004] 数字水印技术是信息安全的前沿技术,它将水印信息与载体数据紧密结合并隐藏其中,成为载体数据不可分离的一部分,由此来确定版权拥有者、跟踪侵权行为、认证数字内容真实性、提供关于数字内容的其他附加信息等。 [0004] Digital watermarking technology is cutting-edge information security technology, which it closely and hide watermark information and data carrier, as part of the data carrier can not be separated, thereby to determine the copyright owner of tracking violations, certified true digital content , providing any additional information about the digital content and so on.

[0005] 数字水印技术发展于上世纪90年代中期,目前在图像、视频、音频等领域的安全保护方面发展得较为成熟,并取得了许多成功应用。 [0005] Digital watermarking technology developed in the mid-1990s, the current security protection in images, video, audio, and other areas of development in a more mature, and has made many successful applications. 近年来,在地理数据安全保护方面,数字水印得到了高度的关注,也取得了许多重要成果,为地理数据安全保护做出了重要贡献。 In recent years, in terms of geographic data security, digital watermarking has been a high degree of concern, but also made many important achievements, has made important contributions to geographic data security. 然而,从目前的研究来看,针对瓦片遥感数据特点的数字水印技术研究还很缺乏。 However, from the current study, the research of digital watermarking technology for tile characteristics of remote sensing data is still lacking.

[0006] 在网络环境中实施有效的瓦片遥感数据的版权保护和信息安全手段成为测绘数字化应用领域的一个新问题,具有十分重要的理论意义和应用价值。 [0006] implement effective tile remote sensing data in a network environment copyright protection and information security has become a means of digital mapping applications of a new problem, theoretical significance and application value is very important.

发明内容 SUMMARY

[0007] 本发明的目的在于:针对目前瓦片遥感数据水印技术无法解决水印信息同步、难以抵抗拼接攻击,无法有效保护瓦片遥感数据版权问题,提出一种基于黄金分割法的抗拼接水印算法,使得水印算法在保持抗几何攻击基础上,能有效抵抗瓦片数据的拼接攻击,从而提高了算法的鲁棒性。 [0007] The present invention is: data watermarking technology can not solve the watermark information synchronization of remote sensing for the current tile, mosaic difficult to resist attack, remote sensing data can not effectively protect tiles copyright problem, a watermarking algorithm based on the Golden Section of the anti-stitching so in keeping watermarking algorithm against geometric attacks based on the attack can effectively resist the mosaic tile data, thereby improving the robustness of the algorithm.

[0008] 为了实现上述发明目的,本发明所采取的技术方案为:一种基于数字水印技术的针对瓦片遥感数据的版权保护方法,其特征在于包括以下步骤: [0008] In order to achieve the above object, the present invention is adopted technical solutions: a copyright protection method of remote sensing data against the tile-based digital watermarking technology, comprising the steps of:

(1)水印信息生成:读取有意义的文字;按照编码方式将读取的文字信息转换成二进制序列W = {0,1},转换得到的序列长度为Length ;将生成的二进制序列进行扩频为长度为 (1) The watermark information generation: reading a meaningful text; convert text messages according to the read encoding binary sequence W = {0,1}, the sequence length of the Length converted; binary sequence generated is expanded frequency of length

况,其中i财;对扩频的二值序列置乱,得到水印信息巧; Conditions, where i Choi; binary scrambling sequence spread spectrum, Qiao watermark information obtained;

(2)水印嵌入:确定水印信息的嵌入位置;建立水印信息位与瓦片遥感数据之间的多对一映射函数,即确定函数}T = 其中,IT表示水印嵌入位,分别表示遥感数据灰度值及其窗口均值参数;建立嵌入规则,水印信息的嵌入方式可以表示为:x©fT[/tir,兄)],根据建立的映射函数确立在像素值,T处嵌入水印信息*表示水印的嵌入 (2) The watermark embedding: determining watermark information embedded position; establishing one mapping function between the bits of the watermark tile remote sensing data, i.e. determination function} T = One, IT represents a watermark embedding bits, respectively, of remote sensing data gray mean value of its window; embedding rule established, embeds the watermark information may be expressed as: x © fT [/ tir, brother)], established in accordance with the established mapping function pixel values, T * represents the watermark embedding watermark information embedded

规则;保存嵌入水印信息后的影像数据; Rules; save the video data watermark information is embedded;

(3)水印检测过程:读取含水印信息的遥感影像数据,获取影像的大小;对影像的水平方向进行黄金分割,分别计算分割后两部分的相关系数,比较两部分的相关系数大小,保留相关系数大的那一部分影像;对保留下的影像块进行垂直方向的黄金分割,分别计算分割后两部分影像的相关系数,比较两部分的相关系数大小,保留相关系数大的那一部分影像;重复以上水平和竖直方向的分割比较过程;当相关系数大的部分影像的相关系数值大于预先设定的阈值,或者是分割后的影像块大小小于等于预先设定的最小分块大小时停止,并输出检测结果。 (3) The watermark detection process: remote sensing data read-containing watermark information, the size of the acquired image; an image in the horizontal direction is golden, two correlation coefficients were calculated dividing the rear portion, two correlation coefficients of the comparison portion, retention large correlation coefficient of that portion of the image; the video blocks in the reserve the vertical golden, correlation coefficients two parts of the image after the division are calculated, the correlation coefficient magnitude comparison of two parts, to retain a large correlation coefficient of that portion of the image; repeat above horizontal and vertical direction during splitting comparison; stopped when the correlation coefficient value correlation coefficient partial image larger than the threshold value set in advance, or the image block size of the divided smaller than the minimum block size is equal to a preset time, and outputs the detection result.

[0009] 编码方式为可逆编码方式。 [0009] encoding is a reversible coding. 嵌入规则为量化的嵌入规则。 To quantify the embedding rule embedding rule. 影像设定的最小分块大小为256 X 256,阈值为0. 5。 The minimum block size is set to the image 256 X 256, the threshold value is 0.5.

[0010] 本发明基于映射函数将瓦片遥感数据与水印信息建立了多对一的函数关系,解决了水印信息不同步的问题,为瓦片数据抗拼接攻击提供了前提,基于黄金分割法的搜索机制能够快速、准确的定位到含水印影像块,在原有水印算法基础上,有效提高了水印算法的抗攻击能力,解决了瓦片遥感数据版权保护问题。 [0010] The present invention is based on a mapping function tile remote sensing data and watermark information to establish a many-to-function relationships, solve the problem of the watermark information is not synchronized, the data provide a prerequisite for the anti-tile mosaic attack, based on the golden section Search mechanism to quickly and accurately locate the watermarked image block, based on the original watermarking algorithm, effectively improve the anti-attack capability watermarking algorithm to solve the problem of copyright protection tile remote sensing data. 该方法鲁棒性强,适用于瓦片遥感数据版权保护中。 The robust method for remote sensing data tile copyright protection.

附图说明 BRIEF DESCRIPTION

[0011] 图I是本发明一种基于数字水印技术的针对瓦片遥感数据的版权保护方法的水印嵌入与检测流程图。 [0011] Figure I is a present invention provide a watermark embedding and detecting a flowchart of a method of copyright protection tiles remote sensing data based on digital watermarking technology for.

[0012] 图2是本发明实施例中原始瓦片遥感数据。 [0012] FIG. 2 is a diagram of the remote sensing data of the original tile embodiment of the present invention.

[0013] 图3是本发明实施例中嵌入的水印信息。 [0013] FIG. 3 is an embodiment of the present invention, the embedded watermark information embodiments.

[0014] 图4是本发明实施例中拼接后的瓦片遥感数据。 [0014] FIG. 4 is a remote sensing data tile embodiment splice embodiment of the present invention.

[0015] 图5是本发明实施例中提取的水印信息。 [0015] FIG. 5 is an embodiment of the present invention, the watermark information extracted embodiment.

[0016] 图6是本发明实施例中拼接后提取的水印信息。 [0016] FIG. 6 is a post-splicing watermark information extracted embodiment of the present invention.

具体实施例 Specific Example

[0017] 下面结合附图和实施例对本发明作进一步详细描述。 Drawings and embodiments of the present invention will be further described in detail [0017] below in conjunction. [0018] 本实施例选择单波段的瓦片遥感数据为实验数据,针对数据的读取、预处理、水印信息生成、水印嵌入、含水印数据保存、搜索影像块、水印检测、检测结果输出的整个过程,给出本发明的一个实施例,进一步详细说明本发明。 [0018] The tile of remote sensing data present embodiment selects a single band of experimental data, for reading data, preprocessing, generating watermark information, watermark embedding, the watermark-containing data storage, searching the image block, the watermark detection, the detection result output the whole process, a given embodiment of the present invention, the present invention is described in further detail.

[0019] 如图2,本实施例选择一幅瓦片遥感数据作为实验数据,数据大小为256x256,数据格式为tif。 [0019] As shown in FIG 2, the present embodiment selects a tile remote sensing data as the experimental data, the data size of 256x256, the data format is tif.

[0020] I.水印信息生成: [0020] I. watermark generating:

步骤一:输入待嵌入的文字信息,本实施例的水印信息为:吉印水印,如图3所示。 Step a: input character information to be embedded, watermark information in this embodiment is: Ji watermarking, as shown in FIG.

[0021] 步骤二:将输入的文字信息采用编码机制进行编码,生成二进制序列。 [0021] Step Two: an input character information using a coding scheme for coding, generating a binary sequence.

[0022] 步骤三:扩频生成的二进制序列,采用I扩频所有的数据,长度为1000位。 [0022] Step Three: generating a binary sequence spreading using spreading all I data length of 1000 bits.

·[0023] 步骤四:采用置乱方法,将1000位二进制序列进行加密,得到水印信息,用于水印嵌入操作。 * [0023] Step Four: A method of scrambling the encrypted binary sequence 1000, to obtain the watermark information, the watermark for embedding.

[0024] 2.水印嵌入: [0024] 2. The watermark embedder:

步骤一:读取实验的瓦片遥感数据,数据的大小为256x256。 Step a: Experimental tile remote sensing data read, data size is 256x256.

[0025] 步骤二:获取遥感影像中心像元值和邻域窗口均值,窗口大小设置为7x7。 [0025] Step 2: Get and remote sensing image center pixel value and the mean neighborhood window, the window size is set to 7x7. 设中心 Design center

像元值为映射函数的自变量 .、,邻域窗口均值为另一个自变量7 = 艰i) Pixel mapping function value of the argument. ,, neighborhood window of another independent variable with mean = 7 difficulties i)

IiKj) kxk IiKj) kxk

O O

[0026] 步骤三:建立水印位,Q与遥感数据(U)的映射函数,W0 = 该映射函数应该尽可能的在上[0,W-1]满映射。 [0026] Step Three: establishing watermark bits, Q and remote sensing data (U) of the mapping function, W0 = the mapping function should be as in [0, W-1] full map.

[0027] 步骤四:采用量化的方式进行水印嵌入,遍历整个瓦片数据进行水印嵌入。 [0027] Step Four: A quantization watermark embedding manner, to traverse the entire tile data embedding.

[0028] 步骤五:保存嵌入水印后的瓦片数据。 [0028] Step Five: Save the watermarked data tile.

[0029] 3.基于黄金分割法搜索机制的遥感数据水印检测规则: [0029] 3. The golden section method based search mechanism of remote sensing data watermark detection rules:

步骤一:读取待检测遥感数据,并获取待检测数据的大小AfxiV。 Step a: remote sensing data read to be detected, and acquires the data size AfxiV be detected.

[0030] 步骤二:初始化检测的水印信息,将1000位的水印信息全部设置为0,即Wt 二{0}。 [0030] Step Two: initializing the detected watermark information, the watermark information 1000 are all set to 0, i.e., Wt-bis {0}.

[0031] 步骤三:判断iVxF与256x256之间的大小关系。 [0031] Step Three: determine a difference between the iVxF and 256x256. 如果大于,则进行步骤四,否贝U,直接检测水印,输出结果。 If so, proceeds to step four, no shellfish U, direct detection of the watermark, the output.

[0032] 步骤四:进行水平和垂直方向的交替水印检测,在两个方向上都是保留相关系数大的那一部分影像。 [0032] Step Four: the horizontal and vertical directions are alternately watermark detection, in both directions of retention portion of the image that the correlation coefficient.

[0033] 步骤五:输出检测结果。 [0033] Step 5: To a detection result.

[0034] 本发明所提出的方法是专门针对瓦片遥感数据的版权保护方法,在进行水印检测时,采用黄金分割法搜索机制进行搜索含有水印的影像块,有效剔除了不含有水印信息影像块的影响,也能快速、准确的搜索到含有水印的影像块。 [0034] The method proposed by the present invention is designed for copyright protection method of remote sensing data of the tile, during watermark detection, using the golden section search mechanism to search an image block containing watermark, effectively removed the block does not contain a watermark image effects, can quickly and accurately search the image block contains the watermark. 可以看出,采用黄金分割法进行搜索含水印影像块的方法可以有效抵抗拼接攻击,水印算法的鲁棒性也得到了较大的提闻。 As can be seen, a method of searching for an image block containing watermark golden section method can effectively resist attack splice, robust watermarking algorithm has been greatly mention smell.

[0035] 4.测试与分析 [0035] 4. Measurement and Analysis

本发明所提出的方法是专门针对瓦片遥感数据的水印方法,采用该方法可以开发并实现基于数字水印技术的瓦片遥感数据版权保护系统。 The proposed method of the present invention is designed for remote sensing data tile watermarking method, this method can be developed and implemented tile remote sensing data copyright protection system based on digital watermarking technology. [0036] (I)瓦片遥感数据提取水印 [0036] (I) remote sensing data extracting watermark tile

对嵌入水印后的瓦片遥感数据进行水印信息提取,如果瓦片遥感数据大小为256x256则直接进行水印信息提取。 Sensing data of the tile after watermark embedding watermark information extraction, remote sensing data if the tile size is 256x256 watermark information is directly extracted. 实验结果表明,该方法可以准确的提取水印信息,且提取率都为 Experimental results show that this method can accurately extract the watermark information, and the extraction rates are

100% o 100% o

[0037] (2)格式转换攻击 [0037] (2) format converting attack

将保存的tif•含水印影像另存为.bmp或.png格式的数据,数据的容量大小、头文件都会发生改变,但是这些攻击并未改变影像的像元值,因而可以有效提取出水印信息。 Saved tif • watermarked image data saved as .bmp or .png format, the capacity of the size of the data, header files will change, but these attacks did not change cell values ​​image, which can effectively extract the watermark information. 实验结果表明,该方法可以有效抵抗格式转换攻击,且提取率都为100%。 Experimental results show that the method can effectively resist attack format conversion, and the extraction rate is 100%.

[0038] (3)拼接攻击 [0038] (3) splicing attack

瓦片遥感数据在使用过程中,往往需要进行拼接处理,拼接后遥感影像的大小和相对位置都发生了改变,此时的水印信息并未消失,然而如何准确定位水印信息的嵌入位置成为解决的关键。 Tile remote sensing data in the course, often require splicing process, the size and relative position of the remote sensing images of the mosaic have changed, this time the watermark information has not disappeared, but how to accurately locate the watermark information embedded position to be solved The essential. 本方法基于黄金分割法进行水印嵌入位置的搜索,可以快速准确的定位嵌入水印的位置,从而有效提取出水印信息。 The present method is based on the golden section search method watermark embedding position can be quickly and accurately locating the position of the embedded watermark, so as to effectively extract the watermark information. 将四幅含水印的瓦片遥感数据进行拼接,其中一幅数据不含有水印信息,拼接的效果如图4所示。 The four remote sensing data tile watermarked spliced, wherein the data does not contain a watermark, as shown in FIG mosaic effect. 实验结果表明,拼接后水印信息仍然可以正确提取出,实验中水印的提取率为100%。 Experimental results show that the watermark can still correct splicing extract out the experiments watermark extraction rate of 100%. ,

Claims (4)

1. 一种基于数字水印技术的针对瓦片遥感数据的版权保护方法,其特征在于包括以下步骤: (1)水印信息生成: 读取有意义的文字; 按照编码方式将读取的文字信息转换成二进制序列,={0.1},转换得到的序列长度为Lmgth ; 将生成的二进制序列进行扩频为长度为况,其中SV ; 对扩频的二值序列置乱,得到水印信息螂; (2)水印嵌入: 确定水印信息的嵌入位置; 建立水印信息位与瓦片遥感数据之间的多对一映射函数,即确定函数JT =,其中,JT表示水印嵌入位,k凡)分别表示遥感数据灰度值及其窗口均值参数; 建立嵌入规则,水印信息的嵌入方式可以表示为根据建立的映射函数确立在像素值;r处嵌入水印信息,©表示水印的嵌入规则; 保存嵌入水印信息后的影像数据; (3)水印检测过程: 读取含水印信息的遥感影像数据,获取影像的大小; 对影像的水平方向进 A copyright protection method for remote sensing data tiles based on digital watermarking technology, comprising the steps of: (1) generating watermark information: reading a meaningful text; character information according to the read coding mode conversion into a binary sequence, {0.1} = sequence length is converted Lmgth; will generate a binary sequence having a length of spreading condition wherein SV; the spread binary scrambling sequence to obtain the watermark information beetle; (2 ) embedding: determining watermark information embedded position; establishing one mapping function between the bits of the watermark tile remote sensing data, i.e. determination function JT =, where, JT represents a watermark embedding bits, k where) represent remote sensing data its mean gray value window parameter; embedding rule established, embeds watermark information may be represented as the pixel value established according to the established mapping function; R & lt embedding the watermark information, the watermark embedding rule indicates ©; watermarked information stored image data; (3) the watermark detection process: remote sensing data read-containing watermark information, the size of the acquired image; an image into the horizontal direction 黄金分割,分别计算分割后两部分的相关系数,比较两部分的相关系数大小,保留相关系数大的那一部分影像; 对保留下的影像块进行垂直方向的黄金分割,分别计算分割后两部分影像的相关系数,比较两部分的相关系数大小,保留相关系数大的那一部分影像; 重复以上水平和竖直方向的分割比较过程; 当相关系数大的部分影像的相关系数值大于预先设定的阈值,或者是分割后的影像块大小小于等于预先设定的最小分块大小时停止,并输出检测结果。 Golden, correlation coefficients of two parts after the division are calculated, the correlation coefficient magnitude comparison of two parts, to retain a large correlation coefficient of that portion of the image; reservations in the image block in the vertical direction of the golden section, the two parts after the divided image calculated separately correlation coefficient, the correlation coefficient magnitude comparison of two parts, that the correlation coefficient of retention portion of the image; and a horizontal split comparator repeat the process in the vertical direction; correlation coefficient when the correlation coefficient larger portion of the image is larger than a preset threshold value stopped, or the image size of the divided blocks less a predetermined minimum block size, and outputs a detection result.
2.根据权利要求I所述的基于数字水印技术的针对瓦片遥感数据的版权保护方法,其特征在于:所述编码方式为可逆编码方式。 The copyright protection method of claim I tile for remote sensing data based on digital watermarking technology, as claimed in claim wherein: the encoding is a reversible encoding method.
3.根据权利要求I所述的基于数字水印技术的针对瓦片遥感数据的版权保护方法,其特征在于:所述嵌入规则为量化的嵌入规则。 The digital watermarking technique based on copyright protection method of remote sensing data against the tile as claimed in claim I, wherein: said embedding rule embedded quantization rules.
4.根据权利要求I所述的基于数字水印技术的针对瓦片遥感数据的版权保护方法,其特征在于:所述影像设定的最小分块大小为256X256,阈值为0. 5。 The digital watermarking technique based on copyright protection method of remote sensing data against the tile as claimed in claim I, wherein: said minimum block size is set to 256X256 image, the threshold value is 0.5.
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