EP 1559270 A1 20050803 - ADAPTIVE AND PROGRESSIVE VIDEO STREAM SCRAMBLING
Title (en)
ADAPTIVE AND PROGRESSIVE VIDEO STREAM SCRAMBLING
Title (de)
PROGRESSIVE UND ADAPTIVE VERSCHLÜSSELUNG FÜR VIEDEOSTRÖME
Title (fr)
EMBROUILLAGE ADAPTATIF ET PROGRESSIF DE FLUX VIDEO
Publication
Application
Priority
- FR 0302914 W 20031003
- FR 0212269 A 20021003
Abstract (en)
[origin: WO2004032510A1] The invention relates to a method of distributing digital video sequences according to a nominal stream format, said sequences consisting of a series of frames. Each of the aforementioned frames comprises at least one block containing numerous coefficients that correspond to simple digitally-encoded visual elements. The inventive method comprises a modification step, whereby at least one block of the original stream is modified. The invention is characterised in that, during the aforementioned modification step, the original stream is modified in an adaptive manner according to at least one part of the characteristics representative of the structure, contents and parameters of the original video stream, the profile of the recipient and external events. In one particular embodiment, the modification step consists in replacing one part of said coefficients in order to produce (i) a main video stream with the nominal format and (ii) complementary modification information which enables the original stream to be reconstructed by a decoder belonging to the recipient equipment. The range of said modifications is variable and determined by the above-mentioned representative characteristics. The invention also relates to a system which is used to implement the inventive method.
IPC 1-7
IPC 8 full level
H04N 5/00 (2011.01); H04N 7/167 (2011.01); H04N 7/24 (2011.01); H04N 7/26 (2006.01); H04N 7/50 (2006.01)
CPC (source: EP)
H04N 7/1675 (2013.01); H04N 19/102 (2014.11); H04N 19/139 (2014.11); H04N 19/159 (2014.11); H04N 19/18 (2014.11); H04N 19/48 (2014.11); H04N 19/61 (2014.11); H04N 19/88 (2014.11); H04N 21/2347 (2013.01); H04N 21/2541 (2013.01); H04N 21/25875 (2013.01); H04N 21/26613 (2013.01); H04N 21/2662 (2013.01); H04N 21/4405 (2013.01); H04N 21/4622 (2013.01); H04N 21/4627 (2013.01); H04N 21/4667 (2013.01); H04N 21/835 (2013.01)
Citation (search report)
See references of WO 2004032510A1
Citation (examination)
- EP 0949815 A2 19991013 - NEC CORP [JP]
- EP 0920209 A1 19990602 - THOMSON MULTIMEDIA SA [FR]
- TANG L ED - ASSOCIATION FOR COMPUTING MACHINERY (ACM): "METHODS FOR ENCRYPTING AND DECRYPTING MPEG VIDEO DATA EFFICIENTLY", PROCEEDINGS OF ACM MULTIMEDIA 96. BOSTON, NOV. 18 - 22, 1996; [PROCEEDINGS OF ACM MULTIMEDIA], NEW YORK, ACM, US, 18 November 1996 (1996-11-18), pages 219 - 229, XP000734722, ISBN: 978-0-89791-871-8, DOI: 10.1145/244130.244209
- YAMAMOTO H: "ON SECRET SHARING COMMUNICATION SYSTEMS WITH TWO OR THREE CHANNELS", IEEE TRANSACTIONS ON INFORMATION THEORY, IEEE PRESS, USA, vol. IT-32, no. 3, 1 May 1986 (1986-05-01), pages 387 - 393, XP000764636, ISSN: 0018-9448, DOI: 10.1109/TIT.1986.1057177
- GRIWODZ C ET AL: "PROTECTING VOD THE EASIER WAY", PROC. 6TH. ACM INT. MULTIMEDIA CONF; [ACM INTERNATIONAL MULTIMEDIA CONFERENCE], BRISTOL, UK, vol. CONF. 6, 12 September 1998 (1998-09-12), pages 21 - 28, XP000977484, ISBN: 978-1-58113-036-2, DOI: 10.1145/290747.290751
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004032510 A1 20040415; AU 2003299174 A1 20040423; EP 1559270 A1 20050803; FR 2845556 A1 20040409; FR 2845556 B1 20050211
DOCDB simple family (application)
FR 0302914 W 20031003; AU 2003299174 A 20031003; EP 03798956 A 20031003; FR 0212269 A 20021003