关键词: 数字水印 图像水印 奇异值分解 水印容量

Abstract:

As a new type of information-concealing technology, digital watermarking has become a focus of research of the industry. This thesis puts forward an icharacteristics, firstly, when watermarking data are be ing embedded, it exercises singular value decomposition by handling block as a unit,and embeds watermarks in the singular value directly; and secondly,  when watermarking data are being extracted, no original image data or original watermarking data are needed, so the improved algorithm is much easier and faster. Experiments show that, compared with the DCT algorithm, the method put forward in this thesis works well in dealing with various kinds of regular data processing and attacks, such as the Gaussian noise, JPEG-eompression, filtering, and cropping.

Key words: digital watermarking, image watermarking, singular value deeomposition, watermarking capacity