Patent ID: 9159112
Filing Date: 2015-10-13
Classification: G06T,H04N

Abstract:
1. A method comprising: a) using a processor, transforming luminance values of one or more pixels in image data of an image so that each of the luminance values falls within a predefined range of luminance values; b) using said processor, dividing the image into blocks of pixels of a predefined size; c) for each block, using said processor to select one of a plurality of saturation patterns representing a binary value of one or more bits of digital watermark data corresponding to the block; and d) for each block, using said processor to embed the binary value of the one or more bits of corresponding digital watermark data into the block by adjusting the saturation of pixels within the block in accordance with the selected pattern, wherein the predefined range of luminance values includes a lower limit that is higher than zero and an upper limit that is lower than a full scale luminance value.