CAJ | 학술논문

部分数字水印算法中水印直接添加到图像小波系数,造成在最大灰度值附近的像素值产生越界,引起水印提取不准确.提出基于混合的小波系数分类教字水印算法,算法在边界值处采用混合嵌入方法,保证了嵌入水印后的像素值不会超出图像灰度范围;其余非边界系数采用叠加水印方法.实验结果表明,该算法避免了水印提取时边界附近产生的误差,水印的相似度也明显提高,嵌入水印后的图像具有较高峰值信噪比.
부분수자수인산법중수인직접첨가도도상소파계수,조성재최대회도치부근적상소치산생월계,인기수인제취불준학.제출기우혼합적소파계수분류교자수인산법,산법재변계치처채용혼합감입방법,보증료감입수인후적상소치불회초출도상회도범위;기여비변계계수채용첩가수인방법.실험결과표명,해산법피면료수인제취시변계부근산생적오차,수인적상사도야명현제고,감입수인후적도상구유교고봉치신조비.
In view of watermark is added into wavelet coefficients in some watermark method,which causes the pixel value over the maximize of the gray image and not extracting the watermark correcfly.A watermarking classified DWT coefficients algorithm based on blending is presented in this papers.The algorithm using different embedding methods on the base of classifying wavelet coefficients which can limit the pixel value within gray image.The other coefficient is added into watermark directly.The experi-mental results show that the algorithm can reduce boundary error while extracting watermark,the watermarking image is of the higher PSNR,and can enhance watermark similarity.