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F.17. CODE LISTINGS FOR CHAPTER 17
739
/***********************************
*
*
Find out if the jth bit is
*
a 1 or 0. If it is non-zero,
*
set the LSB of the message image’s
*
pixel. Else, clear that LSB.
*
***********************************/
new_message = cover_image[i][cie+c_counter];
result
= sample & mask1[j];
if(result != 0x00){ /* set lsb */
if(lsb)
new_message = new_message | mask1[0];
else
new_message = new_message | mask1[EIGHT];
} /* ends if set lsb */
else{ /* clear lsb */
if(lsb)
new_message = new_message & mask2[0];
else
new_message = new_message & mask2[EIGHT];
} /* ends if clear lsb */
cover_image[i][cie+c_counter] = new_message;
c_counter++;
} /* ends loop over j */
} /* ends loop over i */
} /* ends hide_pixels */
/*********************************************
*
*
uncover_image(...
*
*
This routine pulls the message image out
*
of the cover image (the opposite of
*
the cover_image routine).
*
*********************************************/
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740
APPENDIX F. SOURCE CODE LISTINGS
int uncover_image(cover_image,
message_image,
mlength,
mwidth,
clength,
cwidth,
lsb,
n)
int
lsb, n;
long clength, cwidth, mlength, mwidth;
short **cover_image,
**message_image;
{
int h_counter;
for(h_counter=0; h_counter<mwidth; h_counter++){
uncover_pixels(cover_image,
message_image,
h_counter,
h_counter*n,
lsb,
n,
mlength);
} /* ends loop over h_counter */
} /* ends uncover_image */
/*********************************************
*
*
uncover_pixels(...
*
*
This routine pulls the eight bits that
*
make up a pixel in the message image
*
out of the LSB of eight pixels in the
*
cover image. It is the opposite of the
*
cover_pixels routine.
*
*********************************************/
int uncover_pixels(cover_image,
message_image,
mie,
cie,
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F.17. CODE LISTINGS FOR CHAPTER 17
741
lsb,
n,
mlength)
int
cie, lsb, mie, n;
long mlength;
short **cover_image,
**message_image;
{
char result,
new_message,
sample;
char mask1[EIGHT] =
{0x80, /* 1000 0000 */
0x40, /* 0100 0000 */
0x20, /* 0010 0000 */
0x10, /* 0001 0000 */
0x08, /* 0000 1000 */
0x04, /* 0000 0100 */
0x02, /* 0000 0010 */
0x01}; /* 0000 0001 */
char mask2[EIGHT] =
{0x7F, /* 0111 1111 */
0xBF, /* 1011 1111 */
0xDF, /* 1101 1111 */
0xEF, /* 1110 1111 */
0xF7, /* 1111 0111 */
0xFB, /* 1111 1011 */
0xFD, /* 1111 1101 */
0xFE}; /* 1111 1110 */
int c, c_counter, i, j;
printf("\nUP> mie=%d
cie=%d
lsb=%d",
mie, cie, lsb);
/*************************************
*
* If a pixel in the cover image is
* odd, its lsb has been set, so
* the corresponding bit in the
* message image should be set.
*
*************************************/
for(i=0; i<mlength; i++){
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742
APPENDIX F. SOURCE CODE LISTINGS
c = n-1;
new_message = 0x00;
for(j=0; j<n; j++){
if(is_odd(cover_image[i][cie+j])){
/* set bit c */
if(lsb)
new_message = new_message | mask1[j];
else
new_message = new_message | mask1[c];
} /* ends if is_odd */
c--;
} /* ends loop over j */
message_image[i][mie] = new_message;
} /* ends loop over i */
} /* ends uncover_pixels */
/*********************************************
*
*
is_odd(...
*
*
This routine determines if a short is
*
an odd number. If it is, this routine
*
returns a 1, else it returns a 0.
*
*********************************************/
int is_odd(number)
short number;
{
int result = 0;
result
= number % 2;
return(result);
} /* ends is_odd */
stega_show_usage()
{
printf("\n\nNot enough parameters:");
printf("\n");
printf("
"
"\nstega -h cover-image-name message-image-name n"
"\n
to hide the message image in the cover image"
"\n
or"
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F.18. CODE LISTINGS FOR CHAPTER 18
743
"\nstega -u cover-image-name message-image-name n"
"\n
to uncover the cover image from "
"the message image");
}
Listing 17.2 - Source Code to Hide \Unhide" a Message Image in a Cover
Image
F.18 Code Listings for Chapter 18
echo off
rem
erode.bat
rem
Dwayne Phillips
rem
5-30-97
rem
This .bat program calls the erosion program
rem
for the input file and erodes it three times.
rem
The command is:
rem
erode input-file output-file working-dir
rem
Example:
rem
erode a.tif b.tif c:
rem
will run erosion three times on
rem
a.tif and create the file b.tif. It will create
rem
and then delete several temporary files in
rem
the c: directory.
rem
Check for the right number of parameters
if "%3" == "" goto usage
rem
Run erosion three times
rem
and delete the temporary files.
mainsk %1 %3tmp1.tif mer 200 4
mainsk %3tmp1.tif %3tmp2.tif mer 200 4
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744
APPENDIX F. SOURCE CODE LISTINGS
mainsk %3tmp2.tif %2 mer 200 4
del
%3tmp1.tif
del
%3tmp2.tif
goto end
:usage
echo .
echo usage:
erode input-file output-file working-dir
echo .
:end
Listing 18.1 - A .bat File to Repeat Erosion Three Times
echo off
rem
dilate.bat
rem
Dwayne Phillips
rem
5-30-97
rem
This .bat program calls the dilation program
rem
for the input file and dilates it three times.
rem
The command is:
rem
dilate input-file output-file working-dir
rem
Example:
rem
dilate a.tif b.tif c:
rem
will run dilation three times on
rem
a.tif and create the file b.tif. It will create
rem
and then delete several temporary files in
rem
the c: directory.
rem
Check for the right number of parameters
if "%3" == "" goto usage
F.18. CODE LISTINGS FOR CHAPTER 18
745
rem
Run dilation three times
rem
and delete the temporary files.
mainsk %1 %3tmp1.tif mdi 200 4
mainsk %3tmp1.tif %3tmp2.tif mdi 200 4
mainsk %3tmp2.tif %2 mdi 200 4
del
%3tmp1.tif
del
%3tmp2.tif
goto end
:usage
echo .
echo usage:
dilate input-file output-file working-dir
echo .
:end
Listing 18.2 - A .bat File to Repeat Dilation Three Times
echo off
rem
median.bat
rem
Dwayne Phillips
rem
5-30-97
rem
This .bat program calls the median filter
rem
for the input file and performs either a 3x3,
rem
5x5, and 7x7 median filter three times.
rem
The command is:
rem
median input-file output-file size working-dir
rem
Example:
rem
median a.tif b.tif 5 c:
rem
will run a 5x5 median filter three times on
rem
a.tif and create the file b.tif. It will create
rem
and then delete several temporary files in
746
APPENDIX F. SOURCE CODE LISTINGS
rem
the c: directory.
rem
Check for the right number of parameters
if "%4" == "" goto usage
rem
Run the median filter three times
rem
and delete the temporary files.
mainfilt %1 %4tmp1.tif %3 m
mainfilt %4tmp1.tif %4tmp2.tif %3 m
mainfilt %4tmp2.tif %2 %3 m
del %4tmp1.tif
del %4tmp2.tif
goto end
:usage
echo .
echo usage:
median input-file output-file size working-dir
echo .
:end
Listing 18.3 - A .bat File to Repeat a Median Filter Three Times
echo off
rem
bedge.bat
rem
Dwayne Phillips
rem
5-30-97
rem
This .bat program calls all the edge detectors
rem
for the input file.
rem
The command is:
rem
bedge input-file output-dir output-file-prefix
rem
Example:
F.18. CODE LISTINGS FOR CHAPTER 18
747
rem
bedge a.tif c: aa
rem
will create the files:
rem
c:aa1.tif c:aa2.tif c:aa3.tif c:aa4.tif
rem
c:aa5.tif c:aa6.tif c:aa7.tif c:aa8.tif
rem
c:aa9.tif c:aa10.tif c:aa11.tif
rem
Check for the right number of parameters
if "%3" == "" goto usage
rem
Run the edge detector 10 times
medge Q %1 %2%31.tif
1 2
medge B %1 %2%32.tif
1 2 1
medge B %1 %2%33.tif
1 2 2
medge B %1 %2%34.tif
1 2 3
medge H %1 %2%35.tif
1 2
medge D %1 %2%36.tif
1 2
medge C %1 %2%37.tif
1 2
medge R %1 %2%38.tif
1 2 3
medge V %1 %2%39.tif
1 2
medge G %1 %2%310.tif 1 2 3
goto end
:usage
echo .
echo usage:
bedge input-file output-dir output-file-prefix
echo .
:end
Listing 18.4 - A .bat File to Run all the Edge Detectors for Comparison
echo off
rem
lowfilt.bat
rem
Dwayne Phillips
rem
5-30-97
748
APPENDIX F. SOURCE CODE LISTINGS
rem
This .bat program calls all the low pass filters
rem
for the input file.
rem
The command is:
rem
lowfilt input-file output-dir output-file-prefix
rem
Example:
rem
lowfilt a.tif c: aa
rem
will create the files
rem
c:aa6.tif c:aa9.tif c:aa10.tif c:aa16.tif c:aa32.tif
rem
Check for the right number of parameters
if "%3" == "" goto usage
rem
Run the five low pass filters
mfilter %1 %2%36.tif g L 6
mfilter %1 %2%39.tif g L 9
mfilter %1 %2%310.tif g L 10
mfilter %1 %2%316.tif g L 16
mfilter %1 %2%332.tif g L 32
goto end
:usage
echo .
echo usage: lowfilt input-file output-dir output-file-prefix
echo .
:end
Listing 18.5 - A .bat File to Run Five Low-Pass Filters for Comparison
echo off
rem
med357.bat
rem
Dwayne Phillips
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