用于实现图像的离散2维小波变换，图像可用于实现隐藏-Used to image two-dimensional discrete wavelet transform, the image can be used to achieve hidden

小波去噪,以及小波的db4和db7小波变换对图像的变换研究。-Wavelet de-noising and wavelet transform the db4 and db7 wavelet transform research on image.

二维离散小波变换 只能处理长宽一样的方形图像，灰度和彩色图像都可，要用其他图像只需把Lena.bmp改为其他图像，但图像要保存在m文件所在路径下。-Can only deal with the same length and width of the square image, grayscale and color images can be used to use other images only need to change Lena.bmp other images, but th