在图像的DCT系数上嵌入信息，图像为常见的512*512大小的灰度图（实验所用图像为LENA.BMP）。嵌入的信息为一二进制Logo图（实验所用logo图为LOGO.bmp），该图大小为64*64，共4096个Bit。

1.　　使用STDM方法在LENA图中嵌入水印，输出嵌入后的水印图像。

2.　　对水印图像解码，输出解码后得到的logo图，并统计错误率。

3.　　在相同的量化步长下，观察不同强度的噪声攻击下系统性能的变化

4.　　在相同的量化步长下，观察不同强度的JPEG压缩下系统性能的变化

-Information embedded in the DCT coefficients of the image, the image of the common 512* 512 size gray-scale (experimental image LENA.BMP).Information embedded as a binary Logo Figure (experiment with the logo picture shows the LOGO.bmp), the plot size is 64* 64, a total of 4096 Bit.

(1) the use of the STDM method watermarked LENA Figure, output embedded watermark image.

(2) logo watermark image decoding, the output decoded Figure statistical error rate.

The same quantization step, the observed changes in the system performance under different intensity of noise attack

The same quantization step, the observed changes in the strength of JPEG compression system performance under