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Digital image recovering method based on digital water mark technology

A digital image and digital watermarking technology, applied in image coding, image enhancement, image data processing, etc., can solve the problems of poor reconstructed image quality, difficult to restore image content, lack of prior knowledge of reconstructed objects, etc. The effect of quality improvement

Inactive Publication Date: 2004-04-28
刘彤
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Problems solved by technology

Obviously, due to the lack of prior knowledge of the reconstructed object when the data is reconstructed, it is difficult to recover the image expressed by the lost data block with this method when the amount of data lost in the image is large (such as after a large-area clipping operation) content, so the quality of the reconstructed image is poor

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  • Digital image recovering method based on digital water mark technology
  • Digital image recovering method based on digital water mark technology

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Embodiment Construction

[0020] The implementation steps of the digital image restoration method based on digital watermark technology are illustrated below in conjunction with the accompanying drawings:

[0021] figure 1 : It shows that before the digital image enters the transmission channel, the wavelet multi-resolution decomposition is first performed on the digital image, and then the approximate sub-image at the lowest resolution of the image is encoded as the feature information of the image, that is, the feature information of the real number nature is transformed through the encoding process into a {0, 1} signal suitable for watermark embedding, and repeatedly embed the watermark in the detail sub-images of different resolutions and directions in the image through the watermark embedding algorithm, and then obtain the embedded feature information through the wavelet multi-resolution synthesis operation The digital image is sent to the transmission channel after the usual data encoding process...

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Abstract

The digital image recovering method based on digital water mark technology processes digital image through quantizing the image characteristic obtained via wavelet multi-resolution disintegration operation into water mark signal through a quantizing and coding process, embedding the water mark into the image itself through water mark embedding algorithm and obtaining digital image with embedded characteristic information through wavelet multi-resolution synthesis. When the digital image via the said processing has some data loss during transmission or owing to the attack of hacker, the digital image may be restored through extracting water mark from the image, restoring the characteristic information of the image via decoding process and image fusion. The present invention can visual quality of digital image transmitted under harsh condition and may be used in protect digital image.

Description

Technical field: [0001] The invention relates to the field of multimedia information processing. Specifically, the features of the digital image are extracted before the digital image is transmitted, and it is encoded and hidden in the image itself as a watermark. If the image is lost during transmission, the feature information can be extracted from the image containing the watermark. The data provide prior knowledge, and use the image fusion method to fuse the feature information and the damaged image to restore the lost image content. The image restoration method can improve the image visual quality of digital images under harsh transmission conditions, and can also be used to protect the integrity of digital image content. This technology is suitable for networks and communications in government, business, media industry, public security, military and other departments. field. Background technique: [0002] If network congestion occurs during the transmission of multim...

Claims

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Application Information

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IPC IPC(8): G06F12/16G06T5/50G06T9/00
Inventor 刘彤
Owner 刘彤
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