Methods and apparatus for hiding data in halftone images

Details Methods and apparatus for hiding data in halftone images Methods and apparatus for hiding data in halftone images

2006-06-06

2006-06-06

Johns, Andrew W. (Department: 2621)

Image analysis

Applications

C382S140000, C382S237000, C358S003060, C358S003280, C358S534000, C380S051000

Reexamination Certificate

active

07058199

ABSTRACT:
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 neighboring 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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