公开(公告)号：US06275599B1

公开(公告)日：2001-08-14

申请号：US09143354

申请日：1998-08-28

申请人： Roy L. Adler ,  Bruce P. Kitchens ,  Charles P. Tresser ,  Chai W. Wu

发明人： Roy L. Adler ,  Bruce P. Kitchens ,  Charles P. Tresser ,  Chai W. Wu

IPC分类号： G06K900

CPC分类号： G06T1/0042 ,  G06T2201/0052 ,  G06T2201/0053

摘要： A watermarking method involves mostly invisible artifacts and is sensitive to any modification of the picture at the level of precision rendered by the compressed version of the image. The image is compressed according to a known compression standard, such as the JPEG standard, and with a fixed quality setting. Using the JPEG standard, the original image is cut into blocks to which the Discrete Cosine Transform (DCT) is applied and the DCT coefficients quantized. The watermark according to the invention is applied to the quantized DCT coefficients. This is done using an encryption function, such as a secret key/public key algorithm. The JPEG compression is then completed using a lossless compression scheme, such as Huffman coding, to produce the compressed and watermarked image. Authentication of the compressed and watermarked image begins with a lossless decompression scheme to obtain the set of quantized DCT coefficients. The coefficients are authenticated, and the DCT output of each block is dequantized. If necessary, an inverse DCT is applied to each block to output the decompressed watermarked image.

摘要翻译： 水印方法主要涉及不可见的伪像，并且对图像的压缩版本呈现的精度水平对图像的任何修改都敏感。 图像根据已知的压缩标准（例如JPEG标准）被压缩，并且具有固定的质量设置。 使用JPEG标准，原始图像被切割成应用了离散余弦变换（DCT）并且DCT系数被量化的块。 根据本发明的水印被应用于量化的DCT系数。 这是使用加密功能完成的，例如秘密密钥/公钥算法。 然后使用诸如霍夫曼编码的无损压缩方案完成JPEG压缩，以产生压缩和加水印的图像。 压缩和加水印图像的认证以无损解压缩方案开始，以获得量化的DCT系数集合。 系数被认证，并且每个块的DCT输出被去量化。 如果需要，对每个块应用逆DCT以输出解压缩的水印图像。

公开(公告)号：US06957337B1

公开(公告)日：2005-10-18

申请号：US09372170

申请日：1999-08-11

申请人： Timothy Joseph Chainer ,  Bruce P. Kitchens ,  Stephane Herman Maes ,  Marco Martens ,  Joseph Dela Rutledge ,  Charles Philippe Tresser

发明人： Timothy Joseph Chainer ,  Bruce P. Kitchens ,  Stephane Herman Maes ,  Marco Martens ,  Joseph Dela Rutledge ,  Charles Philippe Tresser

IPC分类号： G06F21/00 ,  H04L9/32

CPC分类号： G07F7/1008 ,  G06F21/31 ,  G06F21/32 ,  G06F21/34 ,  G06F21/6245 ,  G06Q20/341 ,  G06Q20/40145 ,  H04L9/3231 ,  H04L2209/805

摘要： A method and apparatus for authenticating (or identifying) a subject, includes using one or a plurality of biometric measurements for authentication (or identification) without any sharing of the subject's biometric data with a party requesting authentication.

摘要翻译： 用于认证（或识别）对象的方法和装置包括使用一个或多个生物测量来进行认证（或识别），而不需要与请求认证的一方共享对象的生物特征数据。

公开(公告)号：US4675650A

公开(公告)日：1987-06-23

申请号：US725954

申请日：1985-04-22

申请人： Don Coppersmith ,  Bruce P. Kitchens

发明人： Don Coppersmith ,  Bruce P. Kitchens

IPC分类号： H03M7/14 ,  H03M5/14 ,  H03M7/42

CPC分类号： H03M5/145

摘要： Code modification circuitry alters the end portion of each block in a sequence of code blocks, and also inserts additional bits at the junction between contiguous blocks. The codes to be processed are run-length limited (RLL) codes having a DC component which is to be removed for certain applications such as magnetic recording. The modification circuitry retains the RLL format. Charge (or the integral of the waveform) accumulated by the sequence of bits of one block is compensated by selecting the sense of charge accumulation in next block to be of opposite sense. This is accomplished by the code modification circuitry using a relatively small set of possible combinations of digital words at the junctions of the blocks.

摘要翻译： 代码修改电路以一系列代码块改变每个块的结尾部分，并且在相邻块之间的连接处插入附加位。 要处理的代码是具有DC分量的游程长度限制（RLL）代码，其将针对某些应用例如磁记录被去除。 修改电路保留RLL格式。 通过在下一个块中选择具有相反意义的电荷累积感来补偿由一个块的位序列积累的电荷（或波形的积分）。 这通过代码修改电路使用在块的结点处的数字字的可能组合的相对较小的集合来实现。