【摘要】 根据人的视觉系统(HVS)的频率响应特性和JND特性,将二维条形码压缩编码后作为数字水印,利用离散小波变换(DWT)嵌入到被保护的数字图像中,较好地解决了二维条形码信息量大与水印隐蔽性之间的问题,同时使二维条码水印在数字图像中有很好的隐蔽性和鲁棒性;嵌入了二维条形码数字水印的图像,经过低通滤波或高通滤波都能提取很好的水印。更多还原

【Abstract】 Based on the frequency response characteristic and just noticeable distortion of human visual system,2-di-mensional bar code is embedded as digital water marking into the protected image through discrete wavelet transform.The problem between a great deal of information and invisibility of digital water marking is solved.At the same time the digital water marking is also robust,that is,after the image with embedded digital water marking is processed by low-pass filter or high-pass filter,the separated digital water marking is almost as well as the original water marking.更多还原