公开(公告)号：US07983441B2

公开(公告)日：2011-07-19

申请号：US11874839

申请日：2007-10-18

Applicant: Steven Erik Vestergaard ,  Che-Wai Tsui

Inventor： Steven Erik Vestergaard ,  Che-Wai Tsui

IPC: G06K9/00

CPC classification number: G10L19/018 ,  G06T1/005 ,  G06T1/0085 ,  G06T2201/0051 ,  G06T2201/0052 ,  G06T2201/0053 ,  H04N1/32203 ,  H04N1/32208 ,  H04N1/32229 ,  H04N2201/3233 ,  H04N2201/327 ,  H04N2201/3284

Abstract: Methods are provided for encoding watermark information into media data containing a series of digital samples in a sample domain. The method involves: dividing the series of digital samples into a plurality of sections in the sample domain, each section comprising a corresponding plurality of samples; processing the corresponding plurality of samples in each section to obtain a single energy value associated with each section; grouping the sections into groups, each group containing three or more sections; assigning a nominal bit value to each group according to a bit assignment rule, the bit assignment rule based on the energy values of the sections in the group; and assigning a watermark bit value to each group. The methods also involve, for each group, comparing the watermark bit value to the nominal bit value and, if the nominal bit value and the watermark bit value of the watermark information bit do not match, modifying one or more energy values of one or more corresponding sections in the group such that re-application of the bit assignment rule would assign the watermark bit value to the group. The bit assignment rule may comprise: a categorization rule for categorizing each group into one of a plurality of categories; and for each category, a unique category bit assignment rule for assigning a nominal zero bit value or a nominal one bit value to each group.

Abstract translation: 提供了用于将水印信息编码到包含样本域中的一系列数字样本的媒体数据的方法。 该方法包括：将一系列数字样本分成样本域中的多个部分，每个部分包括相应的多个样本; 处理每个部分中相应的多个样本以获得与每个部分相关联的单个能量值; 将部分分组成组，每组包含三个或多个部分; 根据比特分配规则向每个组分配标称比特值，该比特分配规则基于组中各个部分的能量值; 并向每个组分配水印比特值。 所述方法还涉及对于每个组，将水印比特值与标称比特值进行比较，并且如果水印信息比特的标称比特值和水印比特值不匹配，则修改一个或多个 组中的相应部分，使得位分配规则的重新应用将向该组分配水印位值。 位分配规则可以包括：用于将每个组分类成多个类别中的一个的分类规则; 并且对于每个类别，用于向每个组分配标称零比特值或标称一比特值的唯一类别比特分配规则。