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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Format | Patent |
Language | English |
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. |
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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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References | Zheng et al. (5515447) 19960500 Rentsch (5541396) 19960700 Longacre, Jr. et al. (5591956) 19970100 Hecht et al. (5521372) 19960500 Rhoads (5748783) 19980500 Rhoads (5850481) 19981200 Bloomberg et al. (6076738) 20000600 Zhang (5245165) 19930900 Zhang (5771245) 19980600 Priddy et al. (4939354) 19900700 Dvorkis et al. (5633489) 19970500 Bloomberg (5761686) 19980600 Priddy et al. (5329107) 19940700 Barton (5646997) 19970700 Shu (5596660) 19970100 Shamir (5369261) 19941100 Stearns et al. (5128525) 19920700 Tomioka et al. (5507527) 19960400 (0777197) 19970600 Kanungo et al. (5966637) 19991000 Thomas (4263504) 19810400 Yoshida (5343031) 19940800 Kopec et al. (5956419) 19990900 Petrie (5572010) 19961100 Batterman et al. (5189292) 19930200 Hecht (5576532) 19961100 Powell (5721788) 19980200 Appel (5278400) 19940100 (WO 97/32262) 19970900 Russell et al. (5905248) 19990500 Bloomberg (5765176) 19980600 Rhoads (5841978) 19981100 |
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