| 摘要 |
<p>A method of digital watermarking in which a digital watermark is embodded into a first image and it is subsequently attempted to identify the digital watermark in a second digital image. The method including the following steps. Measuring intensity gradients at a number of selected points in the first image. Measuring intensity gradients at multiple points in the second image. Comparing the measured intensity gradients in the first and second images and identifying a point in the second image corresponding to each selected point in the first image based on the composition. Calculating the changes between the first and second images from the differences between the locations of the selected points in the first image and the corresponding points in the second image, and correcting for the calculated changes between the first and second images when attemting to identify the watermark in the second image.</p> |
