用小波变换和LGB编码的方法压缩黑白图片。对图像进行小波变换后，仅对细节系数进行压缩，而且不同小波变换层的细节系数的压缩程度不一样。-Using wavelet transform and coding method LGB compress black and white picture. After the wavelet transform of the image, only the details of the coefficient is compressed, and differ