Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for protecting H.264 video data by using robust watermarks

A video data and robust watermarking technology, applied in image data processing, image data processing, digital video signal modification, etc., can solve problems such as high algorithm complexity, easy change of motion vector parity, poor watermark robustness, etc., to achieve robust effect

Inactive Publication Date: 2009-11-18
SUN YAT SEN UNIV
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing digital watermarking technology analyzes the motion vector by grade, divides the N*N motion vector grade, and distributes the watermark to the lower grade vector through a cycle search calculation, so the algorithm complexity is high
[0004] Another digital watermarking technology embeds the watermark by modifying the parity of the motion vector components, that is, changing the length of the MV in the x-direction or y-direction. The algorithm is simple to implement, but the parity of the motion vector is easy to change, so the obtained watermark poor robustness

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for protecting H.264 video data by using robust watermarks
  • Method for protecting H.264 video data by using robust watermarks
  • Method for protecting H.264 video data by using robust watermarks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] The method of the invention is divided into two processes of video watermark embedding and watermark detection. The specific steps of watermark embedding are as follows:

[0046] (a) At the H.264 encoding end, such as figure 1 As shown, the optimal motion vector of the inter-frame block uses the principle of the 1 / 4 pixel full search method, uses the absolute difference (SAD, the Sum of Absolute Difference) standard as the matching criterion, and is calculated by the following steps:

[0047] In H.264, the cost function (cost function) still uses the SAD function:

[0048] F(p)=∑|L(p)-L(c)| where p represents the integer pixel or sub-image point in the previously reconstructed image; c represents the pixel in the current image; L(·) represents the brightness of the pixel value.

[0049] Firstly, the best integer pixel is se...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for protecting H.264 video data by using robust watermarks, which comprises a watermark embedding process, wherein the watermark embedding process comprises the following steps: (1) determining the optimal motion vectors for inter-frame blocks at an encoding end; (2) quantizing the optimal motion vectors to obtain an entire pixel point, and using the entire pixel point as a center pixel point and peripheral nearest half-pixel points as the periphery to obtain a square area; (3) dividing the pixel points in the area into a first pixel group and a second pixel group by a bit of the embedded watermarks corresponding to the inter-frame blocks according to a set grouping method, and modifying the direction of the motion vectors; and (4) writing motion vector values after the modification into video data code streams according to an encoding process.

Description

technical field [0001] The invention relates to a method for video watermarking based on compressed domain, more specifically a method for protecting video data by digital watermarking. Background technique [0002] With the rapid development of digital technology and network technology, some multimedia products (audio, image, video) can be easily obtained from the network. The copyright of these digital products is an urgent problem to be solved, and digital watermarking technology is an effective means to protect multimedia copyright. [0003] The existing digital watermarking technology analyzes the motion vector by grade, divides the N*N motion vector grade, and distributes the watermark to the lower grade vector through a cycle search calculation, so the algorithm complexity is high. [0004] Another digital watermarking technology embeds the watermark by modifying the parity of the motion vector components, that is, changing the length of the MV in the x-direction or ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/64G06T1/00H04N19/124H04N19/176H04N19/467H04N19/51H04N19/89
Inventor 郭耀松李伟刘红梅黄继武方艳梅
Owner SUN YAT SEN UNIV