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US6535614B1 Expired / Lapsed US ⏱️ 0.0 years remaining

Method and apparatus for recording and reproducing electronic watermark information, and recording medium

Assignee: Hitachi Consumer Electronics Co Ltd

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Filing: 1998-08-24

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Granted: 2003-03-18

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Expires: 2018-08-24

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Abstract

Abstract At recording of a video signal, with electronic watermark information being embedded therein, on a recording medium, a reference signal which is formed differently from the watermark information is inserted to the video signal. At reproduction of the video signal, the luminance of the watermark information is modified based on the reference signal.

Inventors

👤 Hiroyuki Kimura
👤 Takao Arai
👤 Toshifumi Takeuchi
👤 Hiroshi Yoshiura

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-11-09 18:12

CPC Classifications

G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; G06T1/0085; G11B20/00086; G11B20/00884; G11B27/00; G11B27/10; H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G06T2201/00; G06T2201/005; G06T2201/0065; H04N2005/91307; H04N2005/91335

Claims Analysis

Total Claims: 4

Claim 1

Independent Claim 147 words

A method of reproducing electronic watermark information comprising the steps of: detecting a reference signal for detecting electronic watermark information from a recording medium having recorded thereon a video signal, the electronic watermark information being embedded in the video signal by alteration of a luminous value of a luminance signal included in the video signal, and the reference signal being inserted in the video signal at a position different from a position of embedment of the electronic watermark information; and modifying a luminous value of the electronic watermark information based on the reference signal;. wherein the modifying step includes the step of calculating a drop of a gain of the reference signal; and wherein the detecting step includes the steps of generating an electronic watermark information position detection signal based on a sync signal, and generating a reference signal position detection signal based on a sync signal.

Claim 2

Independent Claim 147 words

Claim 3

Independent Claim 130 words

An apparatus for reproducing electronic watermark information comprising: an electronic watermark information detecting circuit which detects electronic watermark information from a video signal; a reference signal detecting circuit which detects a reference signal; and a modification circuit which modifies an amplitude of the electronic watermark information based on an amplitude of the reference signal; wherein the modification circuit includes a gain drift calculating circuit which calculates a drop of a gain of the reference signal; wherein the electronic watermark information detecting circuit includes an electronic watermark position generating circuit which generates an electronic watermark information position detection signal based on a sync signal; and wherein the reference signal detecting circuit includes a reference signal position generating circuit which generates a reference signal position detection signal based on a sync signal.

Claim 4

Independent Claim 130 words

References Cited (Backward Citations)

US3569619A Cited

US4944036A Cited

US4238849A Cited

US4230990A Cited

US4230990C1 Cited

US4380027A Cited

US4367488A Cited

US4425642A Cited

US4908873A Cited

US4888798A Cited

US4750173A Cited

US5053956A Cited

US4739377A Cited

US4977594A Cited

US4807031A Cited

US4879747A Cited

US5213337A Cited

US4947028B1 Cited

US4947028A Cited

US5146457A Cited

US5023907A Cited

US5095196A Cited

US4972476A Cited

US5181786A Cited

US5521722A Cited

US5817205A Cited

US5790697A Cited

US5905810A Cited

US5790693A Cited

EP0441702A1 Cited

US5719939A Cited

US5103459B1 Cited

US5103459A Cited

US5027401A Cited

US5113445A Cited

US5905248A Cited

US5963916A Cited

US5374976A Cited

US5315098A Cited

US5200822A Cited

US5288976A Cited

US5280537A Cited

US6166750A Cited

US5838458A Cited

US5495581A Cited

US5295203A Cited

US5259025A Cited

US5721788A Cited

US5502576A Cited

US5735547A Cited

US5659164A Cited

US5469222A Cited

US5809317A Cited

US5379345A Cited

US5740244A Cited

US5428731A Cited

US5857038A Cited

US5496071A Cited

US5416307A Cited

US5652626A Cited

US6266430B1 Cited

US5841978A Cited

US5862260A Cited

US5768426A Cited

US5745604A Cited

US5905251A Cited

US5463209A Cited

US5428607A Cited

US5872589A Cited

US5932863A Cited

US5893101A Cited

US5493677A Cited

US5617119A Cited

US5871615A Cited

US5469506A Cited

US5594226A Cited

US5825871A Cited

US5640193A Cited

US5869819A Cited

US5568550A Cited

US5646999A Cited

US5638443A Cited

US5530852A Cited

US5848413A Cited

US5671282A Cited

US5530759A Cited

US6181802B1 Cited

US5598526A Cited

US6005501A Cited

US5974141A Cited

US5636292A Cited

US5636292C1 Cited

US5727092A Cited

US5778102A Cited

US5710636A Cited

US5687236A Cited

US5613004A Cited

US5818441A Cited

US5978773A Cited

US5742845A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2006-03-17	2006-09-16	2007-03-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2010-03-17	2010-09-16	2011-03-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2014-03-17	2014-09-16	2015-03-18	$7700.00	Window Closed / Lapsed

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