Method and apparatus for hiding data for halftone images

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United States of America Patent

PATENT NO 8170274
APP PUB NO 20110013803A1
SERIAL NO

12889220

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Abstract

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We propose methods for generating a halftone image, in which each pixel takes one of two tone values. The generated image contains hidden data, which is present at data storage pixels chosen using a pseudo-random number generator. In a first case, the data is hidden within an existing halftone image by reversing the tone value at certain of the data storage pixels, and at pixels neighbouring the data storage pixels. In a second case, the halftone image is generated from a grey-scale image, and data is hidden during this conversion process.

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Patent Owner(s)

  • THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Au, Oscar Chi-Lim Hong Kong, CN 83 990
Fu, Ming Sun Hong Kong, CN 7 63

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