| 摘要 |
<p>The present invention provides a method for detecting digital watermark information inserted in original image information from image information in which the digital watermark information is deleted, altered or deformed by executing deforming operation to the original image information. The digital watermark information detecting device 100 comprises: means 2 which calculates a matrix and a transposed matrix about a system matrix from an obtained image information; means 3 which calculates an estimated initial image vector from the image information; means 4 which calculates a residual vector of the image information; means 5 which calculates a square error of the residual vector; means 6 which determines whether or not the residual vector square error value is a minimum value; means 7 which calculates a correcting vector; means 8 which calculates a reverse-rotated image; means 9 which substitutes an output from the reverse-rotated image calculating means with a value calculated by the estimated image vector calculating means; means 10 which obtains an estimated value of the original image information when the minimum value of the residual vector square error is detected; and digital watermark information displaying means 11 which retrieves digital watermark information from the estimated image information of the original image information and which displays the retrieved digital watermark information. <IMAGE></p> |
