Method and device for concealing information as well as method and device for extracting concealed information

A technology of hiding information and information embedding, which is applied in the field of hiding information and extracting hidden information, and can solve the problems of small Intra frame ratio and limited information embedding capacity, etc.

Inactive Publication Date: 2011-04-20
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some applications, the proportion of Intra frames is very small, which greatly limits the information embedding capacity

Method used

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  • Method and device for concealing information as well as method and device for extracting concealed information
  • Method and device for concealing information as well as method and device for extracting concealed information
  • Method and device for concealing information as well as method and device for extracting concealed information

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Embodiment Construction

[0054] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0055] see figure 1 , propose an embodiment of a method for hiding information of the present invention, which includes:

[0056] Step S101, judging whether the P frame macroblock is an IPCM macroblock;

[0057] Step S102, when the P-frame macroblock is an IPCM macroblock, determine the information embedding strength of the IPCM macroblock according to the motion vector information of the P-frame macroblock of the encoded non-IPCM macroblock within the set range;

[0058] Step S103, perform information embedding on the IPCM macroblock according to the information embedding strength.

[0059] Further, the specific process of determining the information embedding strength of the IPCM macroblock according to the motion vector information of the P frame macroblock of the coded non-IPCM macroblock within the set range is...

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Abstract

The invention discloses a method and device for concealing information as well as a method and device for extracting concealed information. The method for concealing information comprises the following steps: judging whether a P-frame macroblock is an IPCM (intra-frame pulse code modulation) macroblock or not; when the P-frame macroblock is the IPCM macroblock, determining the information embedment strength of the IPCM macroblock according to the motion vector information of the P-frame macroblock of a coded non-IPCM macroblock within a set range; and according to the information embedment strength, embedding information to the IPCM macroblock. The method and device provided by the invention take the IPCM macroblock as an information embedment carrier; the information embedment strength is determined according to the motion vector information of the P-frame macroblock of the non-IPCM macroblock within the set range; and according to the information embedment strength, the IPCM macroblock is subjected to information embedment to improve the information embedment amount of the embedment carrier. The method and device for extracting concealed information can extract the concealed information from the IPCM macroblock according to the information embedment strength so as to effectively prevent the information quality of the embedded carrier from declining.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for hiding information, and a method and device for extracting hidden information. Background technique [0002] Information hiding technology based on digital video has developed rapidly in recent years, such as digital watermarking, covert communication and other technologies. This information hiding technology uses video data as the carrier of embedded information. Under the premise of ensuring the quality of video images, it needs to meet the requirements of information embedding capacity, real-time performance, robustness and imperceptibility. Uncompressed video requires a lot of bandwidth and storage space, and video compression technology is very important in the field of video communication. [0003] In order to meet the above requirements, the prior art provides an information hiding technology of the latest video compression standard ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/176H04N19/467
Inventor 罗准刘帅陈军
Owner ZTE CORP
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