JP2010109787A5

JP2010109787A5 -

Info

Publication number: JP2010109787A5
Application number: JP2008280704A
Authority: JP
Filing date: 2008-10-31
Publication date: 2011-03-17
Anticipated expiration: 2028-10-31

Claims

The watermark detection device performs signal processing on the watermarked host signal that is embedded in the original host signal to be embedded with information using digital watermark technology and converted to data format 1 An electronic watermark information detection method for detecting embedded information from a watermarked host signal in data format 2,
An encoding A step for converting the host signal into the data format 1;
A step of decoding A for inversely converting the host signal converted into the data format 1;
An encoding B step for converting the inversely converted host signal into the data format 2;
A step of decoding B for inversely converting the host signal converted into the data format 2;
Setting parameters for controlling the encoding A step and the encoding B step;
Based on the set parameters, the original host signal in which the information is not embedded is subjected to the processes of the encoding A step, the decoding A step, the encoding B step, and the decoding B step. Creating a host signal;
Receiving the watermarked host signal of the data format 2 embedded with the information as input, and creating a decoded watermarked host signal decoded by the process of the decoding 2 step;
Creating a differential signal between the degraded host signal and the composite watermarked host signal;
Detecting the embedded information from the difference signal, and detecting the digital watermark information.

The method of detecting digital watermark information according to claim 1,
The step of setting a parameter for controlling the encoding B step includes:
A step of setting the parameter by reading the watermarked host signal converted into the data format 1 and setting to obtain a high-quality output if there is an unknown parameter. Information detection method.

The method of detecting digital watermark information according to claim 1 or 2 ,
A step of preparing a reliability map based on the processing contents of the block compression encoding when the watermarked host signal composed of a plurality of blocks is decoded by the decoding A step and / or the decoding B step. When,
And a step of preferentially decoding a block set with high reliability when detecting the digital watermark according to the reliability map.

The method of detecting digital watermark information according to claim 3,
In the step of preparing the reliability map, the reliability of a block that is compression-encoded using a reversible transform is set high on the reliability map for the blocks constituting the watermarked host signal. A method for detecting digital watermark information, comprising: setting a reliability of a block that is compression-encoded by referring to a prediction or another block to be low.

The digital watermark information detecting method according to claim 3 or 4 ,
The step of preparing the reliability map includes the step of creating the reliability map using the step of decoding A for the watermarked host signal compressed and encoded by the step of encoding A, and
A method for detecting digital watermark information, comprising: outputting the reliability map to an apparatus for generating the watermarked host signal so as to control an embedding position and / or strength of the information.

The method of detecting digital watermark information according to claim 4,
The original host signal is a moving image;
The method of preparing the reliability map includes the step of preparing the degraded host signal with all frames as MPEG I frames as the setting for obtaining the high quality output.

A method for detecting digital watermark information according to any one of claims 1 to 6 , comprising:
In place of the original host signal, a step of creating a degraded watermarked host signal from a watermarked host signal in which information is embedded in the original host signal using digital watermark technology and before being converted to data format 1; Prepared,
The step of setting the parameter comprises the step of estimating the parameter setting contents of the encoding 2 step from the difference between the host signal with the degraded watermark and the host signal with the watermark of the data format 2 Detection method.

A watermarked host signal in which information is embedded in a host signal using a digital watermark is distributed in data format 1, and a watermark in data format 2 in which signal processing is applied to the watermarked host signal distributed in data format 1 An electronic watermark information detecting method for detecting the embedded information from an incoming host signal,
Creating a degraded watermarked host signal by subjecting the watermarked host signal to signal degradation processing;
Creating a difference signal between the watermarked host signal and the degraded watermarked host signal;
Detecting the information from the difference signal, and detecting the digital watermark information.