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

A payload, video signal technology, applied in speech analysis, image communication, instruments, etc., can solve problems such as inability to decode wrong watermark symbols, and achieve the effect of reducing the number of related calculations and adding robust watermarks

Inactive Publication Date: 2009-08-19
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the decoder or at the receiver side, the received incorrect watermark symbol cannot be decoded, e.g. due to an attack

Method used

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

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Embodiment Construction

[0047] As above, use image 3 A disadvantage of the existing WM frame structure is that it is highly dependent on the detection of sync symbols. For example, in the case where the three sync symbols in the above frame are undetectable, since it is not known which recovery value corresponds to which symbol, all 8 payload symbols would be lost even though they could be recovered.

[0048] Such as Figure 4 As shown in the frame structure of , the present invention does not use any synchronization symbols at all, in Figure 4 In the frame structure of , after each frame or group of 8 payload symbols Pld1 to Pld8 is followed by the next frame or group of 8 payload symbols.

[0049] Each symbol in a frame uses a unique reference sequence to encode its payload. For example, if one bit is sent per symbol, then symbol 1 or payload Pld1 uses sequence 0 to encode the bit value "0" and sequence 1 to encode the bit value "1", symbol 2 or payload Pld2 uses Sequence 2 encodes the bit val...

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Abstract

Watermark information (denoted WM) consists of several symbols which are embedded continuously by reference sequence modulation in an audio or a video signal. At decoder site the WM is regained using correlation of the received signal with a corresponding reference sequence. The symbols form watermark data frames. The invention uses for the bit values 'zero' and 'one' in each payload symbol and for each payload symbol in a watermark data frame different reference sequences, without using synchronisation symbols. A logarithmic search is performed in the WM decoder to reduce the numbers of correlations to be calculated. The invention makes watermarking of critical sound signals much more robust.

Description

technical field [0001] The present invention relates to a method and device for encoding symbols carrying payload data for adding watermarks to audio or video signals, and to a symbol for carrying payload data of watermarked audio or video signals Method and device for decoding. Background technique [0002] Watermark information (denoted WM) consists of symbols which are embedded consecutively in bearer content, such as (encoded) audio or video signals, eg to identify the author of these signals. For example, in the case of using spread spectrum as the basic technique, the WM is recovered at the decoder side by correlating the received signal with a known m-sequence. Most WM techniques send redundant bits for error correction. [0003] In many audio watermarking systems, payload data is organized in frames. A frame begins with one or more sync symbols, followed by one or more payload symbols. The sync symbol signal is just the beginning of the payload bits, and the payl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/018
CPCG10L19/018H04N21/23892H04N21/8358
Inventor 彼得·乔治·鲍姆乌尔里希·施赖伯
Owner THOMSON LICENSING SA
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