Encoding and decoding a message within an image

The present invention relates to techniques for encoding and decoding messages, and more particularly to techniques for encoding a message in an image in which the message is not decodable by visual inspection. A method for decoding a message embedded in a pattern of pixels. The method includes the...

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Main Author Chang, Kenneth H. P
Format Patent
LanguageEnglish
Published 16.11.2004
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Abstract The present invention relates to techniques for encoding and decoding messages, and more particularly to techniques for encoding a message in an image in which the message is not decodable by visual inspection. A method for decoding a message embedded in a pattern of pixels. The method includes the steps of determining the pixel values for pixels from the pattern of pixels, determining binary values from the pixel values for pixels from the pattern of pixels; and determining the embedded message from the binary values. The pixels have a range of pixel values between a maximum and a minimum. The pixels are divided into cells each having glyph cell and background pixels. The binary value of a glyph pixel is determined by the contrast the glyph pixel has with its background pixels. The method can be used to decode embedded web-site address from an image with a foreground image and the embedded web-site address.
AbstractList The present invention relates to techniques for encoding and decoding messages, and more particularly to techniques for encoding a message in an image in which the message is not decodable by visual inspection. A method for decoding a message embedded in a pattern of pixels. The method includes the steps of determining the pixel values for pixels from the pattern of pixels, determining binary values from the pixel values for pixels from the pattern of pixels; and determining the embedded message from the binary values. The pixels have a range of pixel values between a maximum and a minimum. The pixels are divided into cells each having glyph cell and background pixels. The binary value of a glyph pixel is determined by the contrast the glyph pixel has with its background pixels. The method can be used to decode embedded web-site address from an image with a foreground image and the embedded web-site address.
Author Chang, Kenneth H. P
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Title Encoding and decoding a message within an image
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