Method for removing visual watermark of block local encrypted digital image

A partial encryption and digital image technology, applied in the computer field, can solve problems such as damage, unrecoverable carrier images, and watermark images that cannot be removed, and achieve the effects of easy operation, good anti-piracy protection, and easy decryption

Inactive Publication Date: 2007-04-11
DANDONG DONGFANG MEASUREMENT&CONTROL TECHCO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the methods described in the above literature can embed visible watermarks, they cannot completely remove the watermarked image from the watermarked image, which causes irreversible damage to the carrier image.

Method used

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  • Method for removing visual watermark of block local encrypted digital image
  • Method for removing visual watermark of block local encrypted digital image
  • Method for removing visual watermark of block local encrypted digital image

Examples

Experimental program
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Embodiment Construction

[0020] An example of using the present invention to add and remove visible watermarks will be described below in conjunction with the accompanying drawings.

[0021] The carrier grayscale image is shown in Figure 1, with a size of 512×512; the binary watermark image is shown in Figure 2, with a size of 128×128. The implementation steps are as follows:

[0022] a) The embedding party firstly corresponds each pixel of the binary watermark image to the 4×4 pixel block in the carrier grayscale image according to the positional relationship; for example, the watermark image pixel (1, 1) corresponds to the carrier Image pixel blocks (1~4, 1~4), watermark image pixels (1, 2) correspond to carrier image pixel blocks (1~4, 5~8), watermark image pixels (2, 1) correspond to For the pixel block (5~8, 1~4) of the carrier image, if the length or width of the carrier image is greater than 4 times the length or width of the watermark image, then the watermark image will be periodically exten...

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Abstract

The invention is a method that the digital image can be encrypted in block parts and eliminated the visible watermarks. Every pixels of 2-value watermark image will be corresponded to the pixels nub of 4 * 4 size in the vector gray image, and encryption is made to a part of pixels in the block corresponding to black pixels to get the image with translucent watermark. The embedding and the resuming sides possess the same key or key generator. The sender embeds the 2-value digital watermark image into the vector translucently on the base of key, which can be the image of scenery taken by digital camera, CT or magnetic resonance, satellite remote sensing and et al, and discloses the image with digital watermark. When getting it, the resuming side can remove the 2-value digital watermark image to renew the former one by the same key.

Description

technical field [0001] The invention relates to a computer technology method for digital image processing. Background technique [0002] Translucent visible watermarks in digital images can be used to identify the copyright ownership of carrier images. At present, most of the visible watermarking algorithms adjust the gray value of the carrier image according to the gray value of the watermark image. Please refer to the following papers: [0003] 1. B. Huang, and S. Tang, A Contrast-Sensitive Visible Watermarking Scheme, IEEE trans. Multimedia, 13(2), pp.60-66, 2006. [0004] 2.A.Lumini, and D.Maio, Adaptive positioning of a visible watermarkin a digital image, IEEE International Conference on Multimedia and Expo, ICME 2004, vol.2, pp.967-970, 2004. [0005] 3. Y.Hu, and S.Kwong, Wavelet domain adaptive visible watermarking, Electronics Letters, 37(20), pp.1219-220, 2001. [0006] Although the methods described in the above documents can embed visible watermarks, they can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 张伟龚亚林尚庆敏刘辉尹德有尹毅强周洪军
Owner DANDONG DONGFANG MEASUREMENT&CONTROL TECHCO
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