US 10,123,031 B2Granted

MPEG-2 video watermarking technique

AssigneeCisco Technology, Inc.

InventorsHarel Cain, Yaron Sella, Michal Devir

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Abstract

In one embodiment, a method, system and apparatus for watermarking MPEG-2 compressed video is described, the method, system and apparatus including detecting a pair of neighboring blocks in a MPEG-2 encoded I-frame, determining if the pair of neighboring blocks have dct_dc_differential fields with different values that are within a given threshold value of each other, and embedding a watermark payload bit in the neighboring blocks as a positive result of the determining, the embedding including ordering dct_dc_differential fields of the neighboring blocks such that ordering the dct_dc_differential fields in a first manner encodes a one bit and ordering the dct_dc_differential fields in a second manner encodes a zero bit. Related embodiments of methods, systems, and apparatuses are also described.

Claims17

Dependent claims

A method comprising:

detecting a pair of consecutive blocks in a MPEG-2 encoded I-frame, the consecutive blocks having dct_dc_differential fields with different values that are within a given threshold value of each other, and
embedding one of a first watermark payload bit or a second watermark payload bit in the consecutive blocks by ordering dct_dc_differential fields of the consecutive blocks such that ordering the dct_dc_differential fields in an ascending order encodes the first payload bit and ordering the dct_dc_differential fields in a descending order encodes the second payload bit, the embedding comprising swapping the dct_size and one of the dct_dc_differential_l or dct_dc_differential_c fields between the pair of consecutive blocks when, as a result of embedding the one of a first watermark payload bit or a second watermark payload bit the dct_dc_differential fields are ordered to maintain syntax which conforms with MPEG-2 encoded video and to encode one of the first payload bit or the second payload bit.

A method comprising:

(a) receiving a sequence of MPEG-2 encoded video frames;
(b) detecting a pair of consecutive blocks in a macroblock in one of the MPEG-2 encoded video frames;
(c) in response to determining that the pair of consecutive blocks have dct_dc_differential fields having different values that are within a given threshold value of each other,
identifying in at least one of a luma plane or a chroma plane a pair of consecutive blocks where an absolute value of a difference between a dct_dc_differential value of the identified consecutive blocks is within a threshold which was configured in a watermark embedding device used to embed a watermark in a compressed MPEG-2 video stream corresponding to the received sequence of MPEG-2 encoded video frames;
(d) determining that the identified consecutive blocks have an embedded first payload bit of two possible payload bits when a value of the dct_dc_differential field of a first block of the identified consecutive blocks is smaller than a value of the dct_dc_differential field of the second block;
(e) determining that the identified consecutive blocks have an embedded second payload bit of two possible payload bits, when a value of the dct_dc_differential field of the second block of the identified consecutive blocks is smaller than a value of the dct_dc_differential field of the first block;
and
(f) extracting embedded watermark data as either one of the embedded first payload bit or the embedded second payload bit.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/790,028Filed 2 Jul 2015
Published: US 2017/0006301 A15 Jan 2017
Granted: 6 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04N 19/467
Embedding additional information in the video signal during the compression process: characterised by the embedded information being invisible,…
H04N 19/174
The unit being an image region, e.g. an object: the region being a slice, e.g. a line of blocks or a group of blocks
H04N 19/176
The unit being an image region, e.g. an object: the region being a block, e.g. a macroblock
H04N 19/177
Characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the…: the…

Family

US 2017/0006301 A1Pre-grant publication · published 5 Jan 2017
US 10,123,031 B2This patent

From the US filing history. Foreign family members aren’t listed.

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