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

Coefficient modifying of video watermark

A technology of coefficients and coefficient sets, applied in the field of embedding and detecting watermarks

Inactive Publication Date: 2008-09-03
THOMSON LICENSING SA
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In their spread-spectrum approach, the technique is apparently robust and safe, but the detector must synchronize the test video with the original video before detection

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
  • Coefficient modifying of video watermark
  • Coefficient modifying of video watermark
  • Coefficient modifying of video watermark

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Several applications require real-time watermark embedding, such as session-based watermark embedding for set-top boxes and for digital cinema servers (or called media blocks) or projectors. Although fairly obvious, it is worth mentioning that this renderer has difficulty applying the watermarking method, ie using frames arriving later in time at a given time. Preferably, offline precomputation (eg of watermark position or strength) should be avoided. There are several reasons, but two are most important: potential security breach (if an attacker knows the full details of the embedding algorithm, current algorithms for generating watermarks are generally less secure) and impracticality.

[0034] In most applications, a unit of digitally watermarked content usually undergoes some modification between embedding and detection. These modifications are called 'attacks' because they usually degrade the watermark and make detection more difficult. An attack is considered 'un...

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

A method and system for watermarking video images including generating a payload, selecting sets of coefficients, modifying coefficients and embedding said watermark by enforcing relationships between property values of selected sets of coefficients with a volume of video are described. The modified coefficients replace the selected sets of coefficients.

Description

technical field [0001] The present invention relates to watermarking video content, and more particularly to embedding and detecting watermarks in digital cinema applications. Background technique [0002] Videos contain spatial and temporal axes. Images (and like video frames) can be represented in the spatial domain or in the transform domain. In the spatial domain (also known as the 'baseband' domain), an image is represented as a raster of pixel values. A transform domain representation of a pixelated (ie discretized) image can be computed from a mathematical transformation of the spatial domain image. In general, the transformation is preferably reversible, or at least reversible without significant loss of information. There are multiple transform domains, the most familiar being FFT (Fast Fourier Transform), DCT (Discrete Cosine Transform) used in the JPEG compression algorithm and DWT (Discrete Wavelet Transform) used in the JPEG2000 compression algorithm. One ad...

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
IPC IPC(8): G06T1/00
Inventor 贾斯廷·皮卡尔赵键
Owner THOMSON LICENSING SA