Method for marking a compressed digital video signal
AssigneeEcole Polytechnique Federale de Lausanne
InventorsMartin Kutter, Frédéric Jordan, Touradj Ebrahimi
Life of this patent
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Abstract
A method for marking a compressed digital video signal by embedding a digital signature in the compressed video signal, the signal representing a series of at least two video images, each image being divided into a plurality of regions, the signal including movement vectors representing the movement of the regions between the first and the second image, characterised in that it consists in modifying at least one of the coefficients X or Y of at least one of the movement vectors.
Claims21
Method for marking a compressed digital video signal including a bitstream part encoding a P-type or B-type frame by incorporating a digital signature embedded in the compressed video signal, without computing motion estimation and without computing motion compensation, the said signal representing a series of at least two video images, each of the images being divided into a plurality of regions, the said signal comprising motion vectors representing the movement of the regions between the first and second image, the method comprising the steps of:
- Selection Selecting from the signal of the bitstream part encoding a P-type or B-type frame;
- Entropy decoding of the bitstream;
- Extracting the motion vectors;
- Selecting a set of the motion vectors according to visual criterion;
- Selecting a subset of said selected set of motion vectors according to a key;
- Modifying at least one of the coefficient X or Y on at least one of the motion vectors of said selected set of motion vectors;
- Inserting the modified motion vectors in the bitstream;
- Entropy encoding of the bitstream;
- and
- Inserting the bitstream in the video signal.
Dependencies are inferred from the claim text.