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Method and device for embedding and recovering prime image from image with visible watermark

A watermark embedding, original image technology, applied in image communication, image data processing, image data processing and other directions, can solve the problems of inaccurate restoration and compression, avoid visual impact, fast operation, avoid block effect and boundary effect. Effect

Active Publication Date: 2009-07-01
PEKING UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Embodiments of the present invention provide a method and device for embedding a visible watermark in an image and restoring the original image, so as to solve the visual impact caused by block effect and boundary effect and inaccurate restoration and compression in the prior art

Method used

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  • Method and device for embedding and recovering prime image from image with visible watermark
  • Method and device for embedding and recovering prime image from image with visible watermark
  • Method and device for embedding and recovering prime image from image with visible watermark

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Embodiment Construction

[0048] In the embodiment of the present invention, the original image is a data block that records the pixel values ​​of pixels. When the visible watermark is embedded in the original image, the visible watermark is first embedded according to the size of each visible watermark and the corresponding initial position of each visible watermark. Expand the basic area of ​​each visible watermark to obtain the final area embedded in each visible watermark, construct an additional data block, and store information such as the position of the final area, the valid data of the original image corresponding to the final area, and the watermark mask table in the additional data block , connect the constructed additional data block to the tail of the image embedded with the visible watermark; when restoring the original image, restore the original image according to the information stored in the additional data block.

[0049]Among them, the effective data of the original image correspondi...

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Abstract

The invention discloses a method and a device for embedding a visible watermark into an image. The method comprises the following steps: after a fundamental region into which each visible watermark is to be embedded is determined in an original image data block, a final region into which each visible watermark is to be embedded is obtained by enlarging the fundamental region; an image data block, into which the visible watermarks are imbedded, is obtained by embedding the visible watermarks into the fundamental region; an additional data block is built according to information about the visible watermarks and information about the final region; and after the additional data block is connected to the image data block into which the visible watermarks are embedded, the embedding of the visible watermarks is completed. Meanwhile, the invention further discloses a method and a device for recovering an original image. By enlarging the fundamental region and building the additional data block, the invention recovers precisely the original image, avoids blocking effect and boundary effect, and avoids visual impact caused by compression. Moreover, the whole method is self-closed, recovers the original image without requesting extra data, and realizes rapid operation.

Description

technical field [0001] The invention relates to the technical field of digital watermarking, in particular to a method and a device for embedding a visible watermark in an image and restoring an original image. Background technique [0002] It can be seen that digital watermarking is widely used. For example, the background image in e-books, in some chapters for readers to "trial read", the background is often added with semi-transparent watermark patterns such as the publisher's mark, clearly reminding readers that the work is in "trial reading". In the "read" state, this visible watermark will not completely cover the text, and generally adopts a "semi-transparent" form where it overlaps with the text, so that both can be seen at the same time. After the reader purchases the book, the visible watermark will be removed through a certain algorithm, and the original image covered by the watermark will be restored, such as Figure 1A and Figure 1B shown. [0003] The method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24G06T1/00H04N21/8358
Inventor 康凯吴於茜
Owner PEKING UNIV
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