Patent ID: 7092545
Filing Date: 2006-08-15
Classification: G06T

Abstract:
1. An apparatus for embedding digital watermarks into an image based on a wavelet, the apparatus comprising: a watermark embedding region extraction unit for extracting an image region to contain watermarks from a wavelet transformed entire image; a watermark generation unit for generating a watermark data row to be embedded in accordance with a user's private key; a quantization unit for quantizing each image data value of a watermark embedding region at a predetermined quantization level, wherein the watermark data value is added to the image data value; a normalization operation unit for normalizing the quantized data value into a normalized data value; an inverse quantization for inversely quantizing and outputting the normalized data value; and a watermark embedment unit for embedding a watermark-embedded data value as a corresponding pixel data value into the watermark embedding region of the original image, wherein the watermark-embedded data value is obtained by subtracting the watermark data value added prior to the quantization from the inversely quantized data value.