image compression final .......................\invZigzag.m .......................\main.asv .......................\main.m .......................\main2.asv .......................\main2.m .......................\my_dct2.asv .......................\my_dct2.m .......................\my_idct2.m .......................\PSNR.m .......................\toZigzag.m