Average chrominance value modification for digital video watermarking
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Applicant
LUCENT TECHNOLOGIES INC.
Representative
Christopher Malcolm Kelway Dr. et al Watts
Application number
EP04255616A1
Kind
A1
Document number
1519311
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Average chrominance value modification for digital video watermarking

1519311 - EP04255616A1 - EPO

Application Sep 16, 2004 - Publication Mar 30, 2005

Mohammad Hossein Zarrabizadeh

Abstract

Watermark data is effectively placed in at least one of the bit positions, e.g., of the integer portion, of the average value of at least a selected one of the chrominance portions of up to each block, on up to a frame-by-frame basis. Values of the selected chrominance portion of individual pixels in a block may be adjusted if necessary in order to cause the resulting substitution of the selected bit of the average. The bit position replaced may be a function of the block's busyness. A "margin" value may also be added to the average value in order to better ensure that the bit of watermark data survives any MPEG encoding, while minimizing resulting artifacts. A receiver extracts the bit of watermark data from the selected bit position of the average value of the chrominance portion.

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