公开(公告)号：US07365658B2

公开(公告)日：2008-04-29

申请号：US11447573

申请日：2006-06-06

申请人： Vladimir Todorov Todorov ,  Roumen Kirilov Kountchev ,  Mariofanna Geourgieva Milanova ,  Roumiana Atanassova Kountcheva ,  Charles Wesley Ford, Jr.

发明人： Vladimir Todorov Todorov ,  Roumen Kirilov Kountchev ,  Mariofanna Geourgieva Milanova ,  Roumiana Atanassova Kountcheva ,  Charles Wesley Ford, Jr.

IPC分类号： H03M7/46

CPC分类号： H03M7/46

摘要： An apparatus and method for lossless run-length data encoding is disclosed. In the first stage of the method, an input data sequence is transformed without increasing its volume in order to obtain long sequences of identical digits. In the second stage, every such sequence is replaced with a unique shorter sequence. The compressed data is decoded performing corresponding inverse operations. The method is very efficient for compression of some classes of digital images with long sequences of the same number, such as graphics, texts, signatures, and fingerprints.

摘要翻译： 公开了一种用于无损游程长数据编码的装置和方法。 在该方法的第一阶段中，输入数据序列在不增加其体积的情况下被变换以获得相同数字的长序列。 在第二阶段，每个这样的序列被替换为唯一的较短的序列。 对压缩数据进行解码，执行相应的反向操作。 该方法对于具有相同数目的长序列的某些类别的数字图像的压缩非常有效，例如图形，文本，签名和指纹。

公开(公告)号：US08050446B2

公开(公告)日：2011-11-01

申请号：US11180334

申请日：2005-07-12

申请人： Roumen Kirilov Kountchev ,  Vladimir Todorov Todorov ,  Roumiana Atanassova Kountcheva ,  Mariofanna Geourgieva Milanova ,  Charles Wesley Ford, Jr.

发明人： Roumen Kirilov Kountchev ,  Vladimir Todorov Todorov ,  Roumiana Atanassova Kountcheva ,  Mariofanna Geourgieva Milanova ,  Charles Wesley Ford, Jr.

IPC分类号： G06K9/00

CPC分类号： G06T1/0028 ,  G06T1/0071 ,  G06T2201/0052 ,  G06T2201/0083 ,  G06T2201/0202 ,  H04N1/32176 ,  H04N1/32187 ,  H04N2201/3233 ,  H04N2201/327

摘要： Disclosed is a method and system for digital watermarking of multimedia signals. The input multimedia signal is represented using an inverse difference pyramid decomposition. Spectrum coefficients may be calculated for each level of the pyramid using a new kind of complex Hadamard transform, the matrix of which is distinguished from the known ones by the fact that only one-fourth of its coefficients are complex numbers. The phases of a previously selected part of the low-frequency coefficients are modified with the watermark data, limiting the angles of the phase changes in a gap of several degrees only. After an inverse complex Hadamard Transform, the values of the coefficients from all pyramid levels are summed up and the result is the watermarked signal. The watermark can contain multiple independent levels for each level of the pyramid.

摘要翻译： 公开了一种用于多媒体信号的数字水印技术的方法和系统。 输入多媒体信号使用逆差分金字塔分解来表示。 可以使用新型复杂Hadamard变换来计算每个级别的金字塔的频谱系数，其中该矩阵的矩阵通过仅有四分之一的系数是复数的事实与已知的相似。 先前选择的部分低频系数的相位用水印数据进行修改，仅限于几度的间隙中的相位变化的角度。 在逆复合Hadamard变换之后，将来自所有金字塔级的系数的值相加，并且结果是加水印的信号。 水印可以包含金字塔各级的多个独立级别。