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Digital watermark embedding and extracting method for digital image error concealment

A digital image and digital watermarking technology, applied in the field of multimedia information transmission and security, can solve the problems of inappropriate automatic retransmission request, inability to guarantee data, unreliability, etc.

Inactive Publication Date: 2013-07-10
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-efficiency digital image compression coding also means that a large amount of redundant information (spatial and temporal correlation) in digital images will be removed, making the coded output bit stream very sensitive to errors that occur during transmission
Once an error occurs during transmission such as packet loss, it is difficult to recover the lost packet from the received data
At present, the physical channels used to transmit digital image signals, such as wireless channels and the Internet, are error channels or unreliable channels, and there is no guarantee that data can be transmitted without errors.
[0004] Automatic repeat request is a commonly used error correction technology in error handling methods, but in the occasions of digital image transmission with high real-time requirements, such as battlefield situation monitoring, video communication, etc., due to the criticality of time or the sensitivity to delay , it is almost impossible to resend the erroneous data
In addition, automatic retransmission requests are generally applied to broadband communication networks without congestion, but if data packets are lost during transmission due to network congestion caused by limited bandwidth resources, retransmitting erroneous data can only make the channel congested. The situation is even worse, there will be more packets lost, and the quality of the reconstructed digital image at the receiving end will become worse
Therefore, in network communication services with high bandwidth requirements, automatic resend requests are also inappropriate.

Method used

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  • Digital watermark embedding and extracting method for digital image error concealment

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Embodiment 1

[0048] A kind of digital watermark embedding method for digital image error concealment that this embodiment proposes, it specifically comprises the following steps:

[0049]①-1. At the digital image sending end, assume that the original digital image to be transmitted is an 8-bit grayscale image, denoted as F, F={f|0≤f(i,j)≤255,1≤i≤I,1 ≤j≤J}, record the pixel value of the pixel at the coordinate position (i,j) in F as f(i,j), where 0≤f(i,j)≤255, 1≤i≤I , 1≤j≤J, I represents the width of F, J represents the height of F, without loss of generality, it is assumed that I=J here.

[0050] ①-2. Preprocess F to obtain the preprocessed digital image, which is denoted as F', and the pixel value of the pixel whose coordinate position is (i, j) in F' is denoted as f'(i, j) , where, 0≤f'(i,j)≤255; then F' is normalized to obtain a normalized digital image, denoted as F'', and the coordinate position in F'' is ( The pixel value of the pixel point of i,j) is recorded as f''(i,j), f''(i,j)...

Embodiment 2

[0072] A digital watermark extraction method for digital image error concealment proposed in this embodiment specifically includes the following steps:

[0073] ②-1. At the digital image receiving end, assume that the received digital image is an 8-bit grayscale image, denoted as TF, TF={tf|0≤tf(i',j')≤255,1≤i' ≤I',1≤j'≤J'}, record the pixel value of the pixel whose coordinate position is (i',j') in TF as tf(i',j'), where 0≤tf(i ', j')≤255, 1≤i'≤I', 1≤j'≤J', I' represents the width of TF, J' represents the height of TF, without loss of generality, here it is assumed that I'=J ', and the resolution of the TF is the same as that of the original digital image at the digital image sending end.

[0074] ②-2. Perform normalization processing on TF to obtain a normalized digital image, denoted as TF', and denote the pixel value of the pixel point whose coordinate position is (i', j') in TF' as tf '(i',j'), tf'(i',j')=tf(i',j') / 255, where 0≤tf'(i',j')≤1.

[0075] ②-3. Perform L-lev...

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Abstract

The invention discloses a digital watermark embedding and extracting method for digital image error concealment. According to the digital watermark embedding method, the digital watermarking technology is introduced into an image transmitting process, main information of image works is extracted as digital watermarks, the digital watermarks are embedded into the image works selves at a digital image sending end and then block transmission is carried out. Due to the fact that an information source and a channel coding scheme of an existing sending end do not need to be changed, any transmission code rate can not be increased and extra transmission bandwidth can not be occupied. According to the digital watermarking extracting method, the embedded digital watermarks, namely the main information of the images, can be extracted at a digital image receiving end, and image data blocks lost in the transmitting process can be restored in real time, so that any transmission delay can not be increased, and visual error feels caused by data packet dropout in the transmitting process of the images can be effectively reduced.

Description

technical field [0001] The invention relates to a multimedia information transmission and security technology, in particular to a digital watermark embedding and extraction method for digital image error concealment. Background technique [0002] With the rapid development of multimedia technology, computer technology and network communication technology, various types of digital multimedia information are being continuously produced, transmitted and widely used. Among them, digital image, as a kind of multimedia information with rich content, intuitive expression and vivid image, is the most important and widely used digital media in the multimedia information base. According to statistics, about 70% of the information received by humans comes from visual images, which determines that digital image transmission will be one of the most frequent and important means of communication in human social activities. Therefore, how to quickly realize digital image transmission while...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 周亚训郑世超殷丹丹彭胜喜齐亚伟徐星辰
Owner NINGBO UNIV
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