Patent ID: 7797542
Filing Date: 2010-09-14
Classification: G06T,H04N

Abstract:
1. A watermark generating apparatus for generating watermarks to be embedded as a digital watermark in real-time contents, comprising: input means for inputting the real-time contents; generation means for generating, from the real-time contents, watermarks to be outputted corresponding to predicted intensities of the real-time contents wherein the watermarks are generated by adding predicted values of the watermarks to the real-time contents; an output buffer for storing the generated watermarks to be outputted, wherein the generation means includes: prediction means for predicting intensities of the watermarks from prediction of perceptual stimulation values of the real-time contents after a predetermined lapse of time, wherein the predicting means predicts the intensities of the watermarks using an energy value of a frequency component of the watermarks; means for generating a value to be embedded for controlling a value of the output watermarks using a message to be embedded as a digital watermark in the real-time contents; means for controlling the watermarks to be outputted according to the value to be embedded, and for generating watermarks to be outputted using the intensity prediction from the prediction means if the value to be embedded is positive and not generating any watermarks to be outputted if the value to be embedded is negative; and means for controlling the watermarks to be outputted by generating a difference in intensities between the real-time contents and a predicted value of the real-time contents after a time needed to embed the generated watermarks has passed, and for stopping the output of the watermarks to be outputted to the output buffer if the difference in intensities is greater than a pre-set threshold value.