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Watermark detection

A technology of watermarking and detector, applied in the direction of TV, color TV parts, electrical components, etc., can solve the problem that the data rate is not enough to deal with

Inactive Publication Date: 2005-08-24
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this rate is greater than the typical data rate of a real-time video signal, it is still far from sufficient to handle the current situation where the video signal is read from (and recorded on) a CD or DVD drive at speeds exceeding 500 Mbit / s via the IDE / ATAPI interface. The data rate that occurs in a personal computer of

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Embodiment Construction

[0012] Preferred embodiments of the watermark detection method and apparatus according to the present invention will now be described with reference to a personal computer (PC) equipped with a digital versatile disk (DVD) drive. figure 1 In , reference numeral 1 denotes a DVD drive, and reference numeral 2 denotes a PC (the rest). The DVD drive and PC are interconnected in a conventional manner via a bidirectional IDE / ATAPI communication bus 3 . The DVD drive 1 includes conventional electronic drive circuitry 11 for controlling the transfer of data to and from the DVD disc 13 under the control of a microprocessor 12 . The DVD drive also includes a watermark detector 10 connected to the IDE / ATAPI bus 3 to monitor the transfer of multimedia content and control signals between the DVD drive and the PC without interfering with this data transfer. The watermark detector 10 is also connected via a data communication bus 14 (such as the known I 2 C bus) is connected to the micropro...

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Abstract

Disclosed is a solution for connecting an existing MPEG2-compliant watermark detector ( 20 ), that accepts MPEG2 video data up to a certain data rate, to a PC-DVD drive. Problem is that the data rate of the standard IDE / ATAPI bus ( 3 ) is much higher than the watermark detector can handle. The solution is to store MPEG slices in a data buffer ( 214 ), and throw away ( 212 ) slices that do not completely fit in the buffer. Non-slice data is never removed. This results in an MPEG2-compliant stream at a lower rate which the detector ( 20 ) can handle.

Description

technical field [0001] The invention relates to a method and a device for detecting a watermark in an information signal, such as an MPEG compressed video signal. The invention also relates to an interface circuit for interfacing a watermark detector to a communication bus via which a possibly watermarked information signal is transferred from one device to another, for example the IDE / ATAPI bus connecting a DVD drive to a PC. Background technique [0002] Watermarking is a technique for proving ownership of (digital) information content. By hiding the watermark in the content without being noticed, it is possible to prevent piracy and illegal use of the content. Typical applications include copy protection for digital audio and video. [0003] An example of a prior art watermarking system is disclosed in International Patent Application WO-A-99 / 45707. Prior art methods involve watermarking motion video signals. Watermarks (secret pseudo-random noise sequences) are added...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/91G11B20/10H04N7/26
CPCH04N19/00557H04N21/8358H04N19/467
Inventor H·A·G·范武格特
Owner KONINK PHILIPS ELECTRONICS NV