This directory contains the C-based portable digital watermarking algorithm code. The code has a demonstration Of meaning, and there is a certain degree of robustness. NetPGM need to install the package (to access the pgm format images), and then to compile in linux below. NetPGM is the image file input/output package. Can search by. We have already 256 gray level, 512 × 512 size images were tested. Procedure call format, compiled as follows (in encode an example): wm_cox_e-s cox.sig-o wm_image.pgm image.pgm Which,-s that you want to add the watermark signal, cox.sig is the signal file. -O said output image file name wm_image.pgm, image.pgm for the input file name. Several auxiliary programs: cmp_pgm calculate the difference image, PSNR, etc. cmp_dct full frame DCT domain calculation of difference image cmp_dct8x8 calculate the size of 8 × 8 DCT domain differential image For example, in order to produce two PGM images and calculate their differ

signature\cmp_cox_sig.c
.........\cmp_dct.c
.........\cmp_dct8x8.c
.........\dct.c
.........\dct.h
.........\gen_cox_sig.c
.........\gray.c
.........\gray.h
.........\readme.txt
.........\signature.c
.........\signature.h
.........\sort.c
.........\sort.h
.........\wm.c
.........\wm.h
.........\wm_cox_d.c
.........\wm_cox_e.c
signature

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