图像压缩编码，dct变换，量化， Z字形扫描 行程编码-Image compression, dct transform, quantization, Z-shaped scan length encoding

数字图像处理中，DCT变换，Z字形扫描，具有较好的效果，代码易懂-Digital image processing, DCT transformation, Z-shaped scanning, with good results, code understandable

图像压缩，将各种格式的图片进行压缩，可以保证不失真，从bmp，jpg，png...转到jpg，可以调压缩比例-Picure compress, convert other format picture intojpeg and compress it, ensure the quality, bmp,jog,png etc. to jpg, and can adjust the compress rate