METHOD OF DIGITAL WATERMARK EMBEDDING AND EXTRACTING AND DEVICE THEREOF
A method of digital watermark embedding and extracting and device thereof in the text images of black-and-white binary value are disclosed. The embedding method includes: locating the regions of effective characters in the text image, grouping the regions of effective characters to account the numbe...
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Main Authors | , , |
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Format | Patent |
Language | Chinese English French |
Published |
08.05.2008
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Subjects | |
Online Access | Get full text |
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Summary: | A method of digital watermark embedding and extracting and device thereof in the text images of black-and-white binary value are disclosed. The embedding method includes: locating the regions of effective characters in the text image, grouping the regions of effective characters to account the number of black spots in each region, calculating the first pixel number needed to turn off in each character region according to the relative relationship of the number of black spots in each character region of each group, watermark information bit strings, and the first step length, and overturning the pixels in each region according to the first number. The extracting method includes: locating the regions of effective characters in the text image, grouping the regions of effective characters to account the number of black spots in each character region, extracting the embedded watermark information bit strings according to the relative relationship of the number of black spots in the character regions of each group |
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Bibliography: | Application Number: WO2007CN03035 |