一幅图象经过小波变换后为HH、HL、LH、LL四个子带,在小波变换的其中一个子带即h3嵌入水印,LH3为低高频子带 -an image after wavelet transform for HH, HL, LH, LL 4 subband. the wavelet transform of a subband that h3 embedded watermark, LH3 lower high-frequency band

根据嵌入水印值改变直方图,图象经过小波变换后提取其中一个子带的直方图-under the embedded watermark values change histogram, image after wavelet transform from one of the histogram Subband

采样一幅图．利用小波变根据二进制数（水印）来改变图片，提取其中一个子带的直方图．-a sampling plan. Using wavelet based binary variable (Watermark) to change the picture, which extraction of a subband histogram.