matlab ......\cdma_embed.m ......\cdma_recover.m ......\cor_embed.m ......\cor_embed_mod.m ......\cor_recover.m ......\cor_recover_mod.m ......\dct1_embed.m ......\dct1_recover.m ......\dct2_embed.m ......\dct2_embed_mod.m ......\dct2_recover.m ......\dct2_recover_mod.m ......\dwt_embed.m ......\dwt_recover.m ......\lsb_embed.m ......\lsb_recover.m ......\pn_period.m ......\pn_test.m ......\psnr.m