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公开时间: 2009-03-25      申请时间: 2008-10-17
申请人: TELECOMM

CN101393590A
patent for invention


标题(英语)

Method for making four corner number digital watermarking


摘要(英语)

The invention discloses a method for digital watermarking of four-corner numbers, which has small information content and no influence on host data basically, achieves secondary encryption virtually, and effectively improves the invisibility and the safety of information. In the method, character information to be used as watermark is converted into a series of data flow which consists of the numbers from 0 to 9 by a four-corner encoding demander or a four-corner encoding dictionary, a section of zone bits are added in front of the data flow and are used as the start signal of watermark recognition, and then the data flow is added into the host data directly by a wavelet transformation method. The method comprises the following specific steps: firstly, converting watermark information into a group of data flow four numbers of which represent a Chinese character by the four-corner encoding demander; secondly, adding four 1s in front of the data flow as the zone bits; thirdly, dividing the host data to be added with the watermark into a plurality of layers by a one-dimensional discrete wavelet transformation method, and adding the group of the data flow to a certain layer of the host data directly; and fourthly, performing wavelet reconstruction to obtain the needed digital watermarking signal.


申请人详细信息

序号 名称 数据格式
1 TELECOMM docdb

发明人详细信息

序号 名称 数据格式
1 XIEFENG CHENG docdb
2 SHAOBAI ZHANG docdb

法律状态

序号 日期 法律代码 详细信息
1 20090325 C06 PUBLICATION
2 20090520 C10 ENTRY INTO SUBSTANTIVE EXAMINATION
3 20101124 C02 DEEMED WITHDRAWAL OF PATENT APPLICATION AFTER PUBLICATION (PATENT LAW 2001)

文档历史

公开时间: 2009-03-25
CN101393590A
申请时间: 2008-10-17
CN200810155335

CPC分类


IPC分类

G06F21/10

专利家族

40493880

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