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Data processing apparatus and method

A technology of data processing equipment and processors, applied in image data processing, image data processing, instruments, etc., can solve problems such as original image distortion, reduce code word likelihood, etc., and achieve the effect of increasing likelihood

Inactive Publication Date: 2007-11-21
索尼欧洲有限公司
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  • Description
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AI Technical Summary

Problems solved by technology

For example, the original image is distorted due to the angle of the camera making the copy relative to the movie theater screen
If the flagged image is distorted in piracy, it reduces the likelihood of correctly detecting the codeword present in the image

Method used

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  • Data processing apparatus and method
  • Data processing apparatus and method

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Embodiment Construction

[0031] watermark encoder

[0032] In Fig. 1 is shown an encoded data processing apparatus operable to produce a watermarked image by combining a watermark codeword with the image. The encoded data processing apparatus shown in Figure 1 is arranged to combine codewords and images to form a signed copy in the baseband domain of the original image. In FIG. 1 , an image I is generated by a source 1 and supplied to an encoder 2 arranged to combine payload data words P produced by a data word generator 4 so that in encoder 2 At the output of , a marked copy W of the image I is formed. The encoder 2 shown in Fig. 1 comprises a codeword generator 6 which arranges the codeword coefficients into a form corresponding to the transform domain representation of the image. Weighting coefficients are then generated by the perceptual analyzer 8 according to the relative capabilities of the images to carry the codeword coefficients with the greatest strength while minimizing the risk of being...

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Abstract

A data processing apparatus registers an image which has been encoded with a two-dimensional water mark pattern. The water mark comprises for each frame of the image a water mark frame pattern of water mark blocks, the water mark pattern comprising a plurality of regions. Each region of the pattern includes one water mark block selected from a predetermined set of possible water mark blocks in accordance with a key sequence. The key sequence provides a predetermined sequence of selected water mark blocks to form the water mark pattern of each frame to provide a predetermined sequence of water marked frames. The data processing apparatus comprises a block match processor operable to generate block match probabilities comprising for each region of a current frame of the water marked image a probability surface of possible distortion vectors for each possible water mark block of the set of possible water marked blocks which may have been added to that region of the image frame. A water mark block prior probability calculator operable to form block prior probabilities, a distortion probability calculator operable to form a spatial prior probability surface for each region of the current image frame from the block prior probabilities and the block match probabilities, providing a probability distribution of distortion vectors for the region, and a mark of distortion processor operable to form an estimate of a distortion vector for each region from the adapted spatial prior probabilities. Accordingly, distortion in a water marked image can be detected and then removed with out a need to refer to an original copy of the image.

Description

technical field [0001] The present invention relates to a detection data processing apparatus and method for detection payload data generated by combining an image frame with a two-dimensional watermark pattern. The invention also relates to an encoded data processing apparatus and method operable to form a watermarked image by combining payload data with an image copy. Background technique [0002] Generally, techniques for embedding data in material so that the embedded data is perceptible or imperceptible in the material are called watermarking. A codeword is used for a version of a material item in order to identify a version of a material item or to convey the data represented by the codeword. Thus, in some applications, watermarks may facilitate identification of a specific version of material. [0003] The process in which information is embedded in the material to identify a particular version of the material is known as fingerprinting. The codeword identifying th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/005G06T2201/0083G06T2201/0065G06T2201/0051G06T2201/0061
Inventor D·W·塔普森D·L·霍珀
Owner 索尼欧洲有限公司
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