公开(公告)号：US08275168B2

公开(公告)日：2012-09-25

申请号：US12549842

申请日：2009-08-28

Applicant: Chunyu Gao ,  Jing Xiao

Inventor： Chunyu Gao ,  Jing Xiao

IPC: G06K9/00

CPC classification number: H04N1/32208 ,  G06T1/0021 ,  G06T1/005 ,  G06T2201/0051 ,  G06T2201/0062 ,  G06T2201/0065 ,  H04N1/32144 ,  H04N1/32229

Abstract: Bit data is encoded into characters in an input image by providing different darkness levels for pixels in either half of a text character. To determine if the input image is of a right-side up document, or an upside-down document, multiple scans of the input image at 90° rotations between scans may be made. Each scan result is searched for occurrences of a indicator prefix bit-sequence. The scan that contains the indicator prefix bit-sequence is elected as the right-side up orientation for the input image. If multiple scans show occurrences of the indicator prefix bit-sequence, then the scan that has the highest number of occurrences is elected as the correct orientation. Alternatively, the number of data bits between repeated occurrences of the indicator prefix bit-sequence is compared with a predefined message bit size, and the scan that matches most closely is elected as the correct orientation.

Abstract translation: 通过为文本字符的一半中的像素提供不同的黑度级别，将位数据编码为输入图像中的字符。 为了确定输入图像是右侧向上文档还是倒置文档，可以在扫描之间以90°旋转进行输入图像的多次扫描。 搜索每个扫描结果的指示符前缀比特序列的出现。 包含指示符前缀位序列的扫描被选为输入图像的右侧向上方向。 如果多个扫描显示指示符前缀位序列的出现，则选择具有最高出现次数的扫描被选为正确的方向。 或者，将指示符前缀比特序列的重复出现之间的数据比特数与预定义的消息比特大小进行比较，并且最匹配的扫描被选为正确的取向。

公开(公告)号：US08059906B2

公开(公告)日：2011-11-15

申请号：US12173532

申请日：2008-07-15

Applicant: Yasuhiko Iwamoto

Inventor： Yasuhiko Iwamoto

IPC: G06K9/42

CPC classification number: G06T1/0064 ,  G06T2201/0051 ,  G06T2201/0062 ,  G06T2201/0083 ,  H04N1/32208 ,  H04N1/32219 ,  H04N1/32229 ,  H04N1/32251 ,  H04N1/32261 ,  H04N1/32309

Abstract: An image processing apparatus includes an extraction unit, a counting unit and an information embedding unit. The extraction unit extracts a circumscribed figure of a pixel block in an image. The counting unit counts contact portions between the circumscribed figure extracted by the extraction unit and the pixel block. The information embedding unit embeds information to be embedded by adjusting a number of the contact portions between the pixel block and the circumscribed figure extracted by the extraction unit based on the number of contact portions counted by the counting unit and the information to be embedded.

Abstract translation: 图像处理装置包括提取单元，计数单元和信息嵌入单元。 提取单元提取图像中的像素块的外接图形。 计数单元计数由提取单元提取的外接图像和像素块之间的接触部分。 信息嵌入单元通过基于由计数单元计数的接触部分的数量和要嵌入的信息调整由提取单元提取的像素块和外接图像之间的接触部分的数量来嵌入待嵌入的信息。

公开(公告)号：US20090136149A1

公开(公告)日：2009-05-28

申请号：US12173532

申请日：2008-07-15

Applicant: Yasuhiko IWAMOTO

Inventor： Yasuhiko IWAMOTO

IPC: G06K9/36

CPC classification number: G06T1/0064 ,  G06T2201/0051 ,  G06T2201/0062 ,  G06T2201/0083 ,  H04N1/32208 ,  H04N1/32219 ,  H04N1/32229 ,  H04N1/32251 ,  H04N1/32261 ,  H04N1/32309

Abstract: An image processing apparatus includes an extraction unit, a counting unit and an information embedding unit. The extraction unit extracts a circumscribed figure of a pixel block in an image. The counting unit counts contact portions between the circumscribed figure extracted by the extraction unit and the pixel block. The information embedding unit embeds information to be embedded by adjusting a number of the contact portions between the pixel block and the circumscribed figure extracted by the extraction unit based on the number of contact portions counted by the counting unit and the information to be embedded.

Abstract translation: 图像处理装置包括提取单元，计数单元和信息嵌入单元。 提取单元提取图像中的像素块的外接图形。 计数单元计算由提取单元提取的外接图像和像素块之间的接触部分。 信息嵌入单元通过基于由计数单元计数的接触部分的数量和要嵌入的信息调整由提取单元提取的像素块和外接图像之间的接触部分的数量来嵌入待嵌入的信息。

公开(公告)号：US20080205699A1

公开(公告)日：2008-08-28

申请号：US12109914

申请日：2008-04-25

Applicant: Kensuke Kuraki ,  Taizo Anan

Inventor： Kensuke Kuraki ,  Taizo Anan

IPC: G06K9/00

CPC classification number: G06T1/005 ,  G06T2201/0051 ,  G06T2201/0062 ,  G06T2201/0083

Abstract: Provided is a digital watermarking technology for embedding digital watermark information in text data thereby to generate a digitally watermarked image. The technology includes a digital watermarking program, a digital watermarking device and a digital watermarking method, in which digital watermark information can be embedded in document in such a way as not to be easily detected visually and be stably detected even after being printed out, copied or scanned by detecting the features of a character as data to be digitally watermarked, such as the direction and thickness of a line composing the character as the features thereof and embedding the digital watermark information in the character on the basis of the detected features.

Abstract translation: 提供了一种用于将数字水印信息嵌入文本数据中的数字水印技术，从而生成数字水印图像。 该技术包括数字水印程序，数字水印设备和数字水印方法，其中数字水印信息可以嵌入到文档中，使得不能在视觉上容易地检测，并且甚至在被打印出来之后被稳定地检测 或通过将字符的特征作为数字水印的数据进行扫描，例如构成字符的线的方向和厚度作为其特征，并且基于检测到的特征将数字水印信息嵌入字符中。

公开(公告)号：US20050039021A1

公开(公告)日：2005-02-17

申请号：US10871349

申请日：2004-06-17

Applicant: Adnan Alattar ,  Osama Alattar

Inventor： Adnan Alattar ,  Osama Alattar

IPC: G06F17/22 ,  G06F17/24 ,  G06T1/00 ,  H04L9/00 ,  H04N1/32

CPC classification number: G06F17/2294 ,  G06F17/241 ,  G06T1/005 ,  G06T2201/0051 ,  G06T2201/0062 ,  G06T2201/0065 ,  H04N1/32203 ,  H04N1/32219 ,  H04N2201/3233 ,  H04N2201/327 ,  H04N2201/328 ,  H04N2201/3284

Abstract: A text watermarking method embeds an auxiliary message in an original electronic text document to form a watermarked text document. The method applies a spreading function to message symbols to spread the symbols over a carrier, which forms a modulated carrier. It maps elements of the modulated carrier to corresponding inter-word spaces in the electronic text document, and applies an embedding function to modify the corresponding inter-word spaces according to elements of the modulated carrier signal such that the modified inter-word spaces hide the modulated carrier signal in the watermarked text document. The message symbols are automatically decodable from the watermarked document without the original electronic text document. A compatible decoder extracts the auxiliary message from a printed or electronic watermarked text document. The decoder automatically measures inter-word spaces in the watermarked text document. It estimates elements of a modulated carrier signal embedded in the inter-word spaces to form an estimated modulated carrier signal, and applies a de-spreading function to the estimated modulated carrier signal to extract message symbols.

Abstract translation: 文本水印方法在原始电子文本文档中嵌入辅助消息以形成水印文本文档。 该方法将扩展函数应用于消息符号，以便在形成调制载波的载波上扩展符号。 它将调制载波的元素映射到电子文本文档中的对应的字间空间，并且根据调制的载波信号的元素应用嵌入功能来修改对应的字间空间，使得修改的字间空间隐藏 在水印文本文档中调制载波信号。 消息符号可以从没有原始电子文本文档的水印文档中自动解码。 兼容解码器从打印或电子水印的文本文档中提取辅助消息。 解码器自动测量水印文本文档中的字间空格。 它估计嵌入在字间空间中的调制载波信号的元素以形成估计的调制载波信号，并且对估计的调制载波信号应用去扩展功能以提取消息符号。

公开(公告)号：US06769061B1

公开(公告)日：2004-07-27

申请号：US09487150

申请日：2000-01-19

Applicant: Keith Thomas Ahern

Inventor： Keith Thomas Ahern

IPC: G06F124

CPC classification number: G06F17/2294 ,  G06F17/2205 ,  G06T1/0021 ,  G06T2201/0062 ,  H04N1/32128 ,  H04N1/32203

Abstract: Meta-information, such as a digital watermark, that is associated with a document is encoded by using characters, or sequences of characters, that are “invisible” when rendered. Characters such as spaces, tabs, carriage returns, backspaces, line feeds, and so on are used to encode the watermark. The encoded “invisible” meta-information item is preferably appended to the document. A receiving device that is compatible with this encoding is able to decode and process the meta-information, for example, to verify the contents and/or the originator of the document. A receiving device that is not compatible with this encoding will merely display or print additional “white space” corresponding to the “invisible” meta-information. By appending this invisible encoding to the document, this additional white space will occur after the display or printing of the document, in a visually unobtrusive form.

Abstract translation: 与文档相关联的元信息（例如数字水印）通过使用被呈现为“不可见”的字符或字符序列进行编码。 诸如空格，制表符，回车符，后退空格，换行符等字符用于对水印进行编码。 编码的“不可见”元信息项优选地附加到文档。 与该编码兼容的接收设备能够对元信息进行解码和处理，例如验证文档的内容和/或发起者。 与该编码不兼容的接收设备将仅显示或打印与“不可见”元信息相对应的附加“空格”。 通过将这个不可见的编码附加到文档中，这个额外的空格将在文档的显示或打印之后以视觉上不显眼的形式出现。

公开(公告)号：US20040071364A1

公开(公告)日：2004-04-15

申请号：US10617193

申请日：2003-07-11

Inventor： Yukiko Yamazaki ,  Takahiro Yagishita

IPC: G06K009/36

CPC classification number: G06T1/0021 ,  G06T2201/0062

Abstract: An image processing apparatus for embedding an electronic watermark into an original image including a background process device and a watermark embedding device. The background process device processes the background of the original image. The watermark embedding device embeds electronic watermark information into the original image after processing by the background process device.

Abstract translation: 一种用于将电子水印嵌入到包括背景处理装置和水印嵌入装置的原始图像中的图像处理装置。 后台处理设备处理原始图像的背景。 水印嵌入装置在后处理装置处理之后将电子水印信息嵌入到原始图像中。

公开(公告)号：US20040022411A1

公开(公告)日：2004-02-05

申请号：US10385852

申请日：2003-03-12

Applicant: Canon Kabushiki Kaisha

Inventor： Jun Tamaru ,  Keiichi Iwamura

IPC: G06K009/00 ,  G06K009/36

CPC classification number: G06T1/005 ,  G06T2201/0051 ,  G06T2201/0062 ,  G06T2201/0065 ,  G06T2201/0083

Abstract: The invention is to precisely extract a digital watermark from image data which are subjected to embedding of the digital watermark in a state of a binary image and are then converted into a multi-value image (gray scale image). For attaining the foregoing object, a digital watermark extracting apparatus for extracting a digital watermark for example in an original includes an acquiring unit for acquiring multi-value image data obtained by reading the original with a predetermined reading unit, a pre-processing unit for selecting one of plural threshold values and binarizing the multi-value image data with the selected threshold value, and an extracting unit for extracting the digital watermark from image data binarized in the pre-processing unit, wherein selection of the threshold value, binarization an extraction of the digital watermark are repeated to obtain an optimum extraction result of the digital watermark.

Abstract translation: 本发明是从二进制图像的状态中嵌入数字水印的图像数据精确地提取数字水印，然后转换为多值图像（灰度图像）。 为了实现上述目的，例如在原件中提取数字水印的数字水印提取装置包括：获取单元，用于获取通过以预定读取单元读取原稿而获得的多值图像数据;预处理单元，用于选择 多个阈值中的一个，并且利用所选择的阈值对多值图像数据进行二值化;以及提取单元，用于从在预处理单元中二值化的图像数据中提取数字水印，其中阈值的选择，二值化提取 重复数字水印以获得数字水印的最佳提取结果。

公开(公告)号：US20040001606A1

公开(公告)日：2004-01-01

申请号：US10187252

申请日：2002-06-28

Inventor： Kenneth L. Levy

IPC: G06K009/00

CPC classification number: G06T1/0021 ,  G06K15/1831 ,  G06T2201/0051 ,  G06T2201/0062

Abstract: A method of embedding and detecting a digital watermark in a rendered document, such as printed or displayed document, by using a watermark font. The watermark font has multiple representations of each character, wherein each character representation is visibly similar but the difference can be detected in the rendered version of the font by a computer. This watermarking system can efficiently be used to identify and forensically track all rendered, especially printed, documents. In fact, if each character is represented twice, the system can use standard ANSI characters between character codes 0 and 127, and a slightly modified version of each of these characters represented with character codes 128 to 255, such that each version of a character carries a bit. For this example, the watermark embedding process is as simple as whether or not to add 128 to the standard ANSI code. Furthermore, if the character codes are modified before the file is saved, the character codes carry the watermark within the electronic file, as well as the rendered characters carry the watermark in the rendered version.

Abstract translation: 通过使用水印字体在被渲染的文档（例如打印或显示的文档）中嵌入和检测数字水印的方法。 水印字体具有每个字符的多个表示，其中每个字符表示可见地相似，但是可以通过计算机在字体的呈现版本中检测到差异。 该水印系统可以有效地用于识别和法医跟踪所有呈现的，特别印刷的文档。 事实上，如果每个字符被表示两次，则系统可以使用字符代码0和127之间的标准ANSI字符，以及用字符代码128至255表示的每个字符的稍微修改的版本，使得每个字符的版本携带 一点点。 对于该示例，水印嵌入过程与是否向标准ANSI代码添加128一样简单。 此外，如果在保存文件之前修改字符代码，则字符代码在电子文件内携带水印，以及渲染的字符在渲染版本中携带水印。

公开(公告)号：US12014440B1

公开(公告)日：2024-06-18

申请号：US18424760

申请日：2024-01-27

Applicant: Nanjing Normal University

Inventor： Na Ren ,  Xuchao Lv ,  Changqing Zhu ,  Qianwen Zhou ,  Heyan Wang

IPC: G06T1/00 ,  G01C21/00

CPC classification number: G06T1/005 ,  G01C21/38 ,  G06T2201/0062 ,  G06T2201/0063 ,  G06T2201/0065 ,  G06T2201/0202

Abstract: A watermarking method for a high-definition map based on invisible characters includes: firstly, establishing mapping relations between invisible characters and bit characters, a space character, and decimal digits; and combining watermark characters with corresponding positions thereof, adding Hamming code into a watermark character sequence, and converting the watermark character sequence into invisible characters to construct a composite watermark character sequence. Before watermark detection, a sequence of elements in map data is scrambled according to logistic chaotic mapping, and then the composite watermark character sequence is embedded according to the scrambled sequence. During watermark detection, the data are preprocessed, a sequence during watermark embedding is obtained, and then watermark information is extracted, errors are corrected, and an error correcting code is removed after correction to obtain final watermark information. According to the watermarking method, watermark embedding and watermark detection can be realized not changing data availability and high-accuracy characteristic.