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Method and apparatus for encoding and decoding symbols carrying payload data for watermarking an audio or video signal

一种符号、编码的技术，应用在图像数据处理、图像数据处理、电视系统的零部件等方向，能够解决增加WM帧、不能够恢复WM、净比特率低等问题，达到水印鲁棒的效果

Inactive Publication Date: 2006-09-20
THOMSON LICENSING SA
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Problems solved by technology

But if the error correction capability is exceeded, the WM cannot be restored
[0004] Second, the additional redundant bits increase the length of the WM frame, leading to a higher probability that the frame is longer than the length of the signal in which the WM frame can be sent
Third, error correction is usually not relevant to the signal to be watermarked, thus resulting in a signal with a lower net bitrate than necessary for a "good" signal and insufficient error correction for a "bad" signal due to the necessary parity bits

Method used

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  • Method and apparatus for encoding and decoding symbols carrying payload data for watermarking an audio or video signal
  • Method and apparatus for encoding and decoding symbols carrying payload data for watermarking an audio or video signal
  • Method and apparatus for encoding and decoding symbols carrying payload data for watermarking an audio or video signal

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Embodiment Construction

[0049] The smallest self-contained unit of a watermark is called a frame. image 3 shows three consecutive frames FR n-1 、FR n and FR n+1 . A frame consists of a number of synchronization blocks SYNBL (at least one synchronization block) required to detect the start of the frame at the decoder side and a number of payload blocks PLBL (at least one valid payload block or symbol) carrying the actual information. Frames are inserted into the audio stream either synchronously or asynchronously, depending on the technology. Insertion of payload blocks is done consecutively, ie synchronously after the SYNBL block. Each payload block holds one or more bits of information. Payload blocks are therefore also called symbols. The payload symbols include information to be inserted into the WM, and optionally contain redundant information for error correction. For example, a typical setup is 5 sync blocks and 36 payload blocks / frame, each payload block carries 2 bits, so 24 of these ...

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Abstract

Watermark information (denoted "WM") consists of a number of symbols that are embedded consecutively in an audio or video signal. At the decoder, WM is retrieved by using the correlation of the received signal with the m-sequence if spreading is used. In some watermarking techniques, the watermark information is sent asynchronously, ie it is continuously tested whether it is possible to imperceptibly embed WM in the audio or video signal. Only send WM frames if this test is true. However, a WM frame consists of dozens of symbols, each carrying one or more bits transmitted synchronously. That is, if the period in which WM can be embedded is shorter than the frame length, some symbols cannot be restored on the receiver side. According to the invention, each WM symbol carries an ID term in addition to its normal payload, and it has been tested in the encoder whether the signal is "good enough" so that the embedded symbols can be recovered at the decoder side.

Description

technical field [0001] The present invention relates to a method and apparatus for encoding symbols carrying payload data for watermarking an audio or video signal and to a method and apparatus for decoding symbols carrying payload data for watermarking an audio or video signal Sign of the payload data. Background technique [0002] Watermark information (denoted "WM") consists of symbols which are embedded consecutively in the carrier content, for example in a (coded) audio or video signal, in order to identify the author of the signal. At the decoder, the WM is retrieved by using the correlation of the received signal with the known m-sequence, eg if spread spectrum is used as the underlying technique. In some watermarking techniques, the watermark information is sent asynchronously, ie it is continuously tested whether it is possible to imperceptibly embed WM in the (encoded) audio or video signal. Only send WM frames if this test is true. However, a WM frame consists ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26G06T1/00G10L19/018
CPCG06T1/005G06T1/0028G06T2201/0065G06T2201/0202H04N5/913
Inventor 彼得·乔治·鲍姆沃尔特·弗斯辛
Owner THOMSON LICENSING SA
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