处理图像lena.bmp,并画出各图像的灰度层次的分布图，并对256位和16位信源数据进行霍夫曼编码-lena.bmp image processing and paint images of the gray level of distribution map as well as 256-bit and 16-bit data source coding Hoffman

python t_wave_53.py reads ../lena_256.png to generate m then reads lena256.hex writes test1_256_fwt.png and test1_256_iwt.png