Browse Prior Art Database

Multiple Area DataHiding Method Disclosure Number: IPCOM000013463D
Original Publication Date: 2001-Oct-22
Included in the Prior Art Database: 2003-Jun-18
Document File: 4 page(s) / 218K

Publishing Venue



Disclosed is the technique of the Watermarking technology that allows users to embedded/retrieved multiple information

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Multiple Area DataHiding Method

Disclosed is the technique of the Watermarking technology that allows users to embedded/retrieved multiple information
to/from a single piece of digital contents. The technique consists of two parts. (1) Embedding multiple watermarks, that are not interfere to each other, into a single digital content and (2) Retrieving any but only one watermark data from the specified region in the digital content, which shows the strongest watermark signal in that specified region. The technical feasibility of this technique is confirmed by using IBM DataHiding technology for still images, but it is also applicable to audio

files as well as motion pictures. DataHiding Technology This technique uses "Invisible and robust" watermarking technology, that is robust against image editing such as Trimming, Compression, Rotation, etc&Thorn;. Watermark information is in embedding image area itself, thus, it can retrieve watermark information from editing embedding image, not need additional area information file such as frame information.

DataHiding key

The detection and embedding watermark keys are designed to be symmetric, the watermark detector equipped with either detection key would only be able to detect the watermark information that is embedded using the same watermark key, and ignore the rest. Therefore, only the designated watermark information will be retrieved from the image.

In addition, the watermarks with different watermark keys are orthogonal to each other, and not to interfere each other. Thus watermark regions that are embedded with different watermark keys, can be overlapped. In order to detect multiple layers of watermarks, the detector will conduct simultaneous detection using multiple detection keys to seek watermark which matches the detection key. In addition, we added an interface for the user to specify location in the digital content, where the user has the most interest. The detector will conduct detection operation centered at the user-specified location, thus will retrieve the embedded watermark that is associated to that specific location.

In Fig.1 example, two different watermark information, Ai and Bi, are embedded into the same host digital image using different watermark keys Ak and Bk.


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Watermarked area A is embedded watermark information(Ai) with Watermark key(Ak). Watermarked area B is embedded watermark information(Bi) with Watermark key(Bk). Out of Watermarked area A and B is not-embedded area,...