摘要
通过对现有图像压缩和水印技术的研究,考虑图像压缩率和图像恢复的容错能力,提出了一种基于分形图像压缩编码的整数小波图像水印技术。水印嵌入时,用分形压缩编码技术对灰度水印图像进行高效压缩,再把压缩编码嵌入到载体图像的整数小波系数里,实现了在数字图像整数小波变换域中水印的大容量无损嵌入。根据提取算法,盲提取水印图像的分形编码,分形解压缩获得水印图像。经过实验验证,本水印技术具有较好的数据压缩和隐蔽性能,达到预期的设计目的。
Considering the image compressibility and the error allowance of decompressing image, an image watermarkmg tectmique based on fractal compression in the integer wavelet transform domain is presented. In the watermarking embedding process a kind of fractal compression technique is used to encode the gray watermarking image and the fractal codes are embedded into the integer wavelet coefficients of the gray host image. When the watermark extracted, according to the computing algorithm, the fractal codes may be entirely gotten back in the integer wavelet domain of the watermarked image without the original images and decoded into the watermarking image, so that a high-capacity lossless image watermarking technique comes true. Through the validation of the experiments, this watermarking technique has good performance of data compression and invisibility.
出处
《计算机工程与设计》
CSCD
北大核心
2007年第12期2880-2882,共3页
Computer Engineering and Design
关键词
数字水印
分形
图像压缩
整数小波变换
digital watermark
fractal
image compression
integer wavelet transform
