ELECTRONIC WATERMARKING METHOD, ELECTRONIC WATERMARK DETECTING METHOD, APPARATUS AND PROGRAM

An electronic image into which an electronic watermark is to be embedded is divided into a plurality of image regions spatially, and pixels each having a property of being difficult to visually recognize a variation in a pixel value are extracted as adaptive pixels from each of the plurality of imag...

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Bibliographic Details
Main Authors ITO, HIROSHI, SUZUKI, MITSUYOSHI, OHTAKE, GO, GOSHI, SEIICHI, FUJII, RYOUSUKE, MAGAI, KOUICHI, WADA, MINORU
Format Patent
LanguageEnglish
French
German
Published 11.04.2012
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:An electronic image into which an electronic watermark is to be embedded is divided into a plurality of image regions spatially, and pixels each having a property of being difficult to visually recognize a variation in a pixel value are extracted as adaptive pixels from each of the plurality of image regions. A variation between the pixel values of the adaptive pixels in one of the plurality of image regions and those of the adaptive pixels in an adjacent one of the plurality of image regions is produced, and the pixel values of the adaptive pixels of the plurality of image regions are varied in a time direction according to the value of an embedded bit set of the electronic watermark. An electronic-watermark-embedded image is then generated by making the variation in the pixel values of the adaptive pixels vary step by step at a boundary between the two of the plurality of image regions and/or in the time direction so that the variation makes a slow transition.
Bibliography:Application Number: EP20050710168