Method and Apparatus for inserting and detecting watermarks in images derived from a source image

摘要

The present invention provides an image watermarking technique that is the watermark is inserted into the adjusted digital image source to be limited by a particular boundary rectangle. (If small) source image is larger than the square face, his size is reduced by a common factor (zoom in) until it is fully adjusted largest image that fits within the rectangle. Walker mark is inserted into the scaled image is greater than or calculating at least one derived image of a small size. Then, the water, no matter the size of the image derived from the marking scaled image, the image makes it very easy to re-enter the detection of a watermark embedded by fit to zoom in or out in the square. The size of the bounding rectangle is specified or each source image, contrast, and the common boundary rectangles can be used for a group of source image. ; Watermark insertion, detection, bounding rectangle