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F.12. CODE LISTINGS FOR CHAPTER 12
619
***********************************************/
less_overlay(the_image, out_image,
rows, cols)
short **the_image,
**out_image;
long cols, rows;
{
int
i, j;
for(i=0; i<rows; i++){
if ( (i%10) == 0) printf(" %d", i);
for(j=0; j<cols; j++){
if(the_image[i][j] < out_image[i][j])
out_image[i][j] = the_image[i][j];
} /* ends loop over j */
} /* ends loop over i */
} /* ends less_overlay */
/**********************************************
*
*
average_overlay(...
*
*
This function mixes in1 and in2
*
and writes the result to the output image.
*
It writes the average of in1 and in2 to the
*
output image.
*
***********************************************/
average_overlay(the_image, out_image,
rows, cols)
short **the_image,
**out_image;
long cols, rows;
{
int
i, j;
for(i=0; i<rows; i++){
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620
APPENDIX F. SOURCE CODE LISTINGS
if ( (i%10) == 0) printf(" %d", i);
for(j=0; j<cols; j++){
out_image[i][j] =
(the_image[i][j] + out_image[i][j])/2;
} /* ends loop over j */
} /* ends loop over i */
} /* ends average_overlay */
Listing 12.4 - The Overlay Subroutines
/*********************************************
*
*
file mainover.c
*
*
Functions: This file contains
*
main
*
*
Purpose:
*
This file contains the main calling
*
routine that calls the overlay functions.
*
*
External Calls:
*
imageio.c - create_image_file
*
read_image_array
*
write_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
overlay.c - non_zero_overlay
*
zero_overlay
*
greater_overlay
*
less_overlay
*
average_overlay
*
*
Modifications:
*
6 March 1993 - created
*
22 August 1998 - modified to work on
*
entire images at once.
*
19 September 1998 - modified to work with
*
all I O routines in imageio.c.
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F.12. CODE LISTINGS FOR CHAPTER 12
621
*
********************************************/
#include "cips.h"
short **the_image;
short **out_image;
main(argc, argv)
int argc;
char *argv[];
{
char
name1[80], name2[80], name3[80], type[80];
int
count, i, j;
long
length, width;
/*********************************************
*
*
Interpret the command line parameters.
*
**********************************************/
if(argc < 5){
printf(
"\n\nNot enough parameters:"
"\n"
"\n usage: mainover in-file1 in-file2 out-file "
"type"
"\n"
"\n recall type: nonzero zero greater less"
" average"
"\n the input images must be the same size"
"\n"
"\n");
exit(0);
}
strcpy(name1, argv[1]);
strcpy(name2, argv[2]);
strcpy(name3, argv[3]);
strcpy(type, argv[4]);
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622
APPENDIX F. SOURCE CODE LISTINGS
if(does_not_exist(name1)){
printf("\nERROR input file %s does not exist",
name1);
exit(0);
}
if(does_not_exist(name2)){
printf("\nERROR input file %s does not exist",
name2);
exit(0);
}
/*********************************************
*
*
Read the input image headers.
*
Ensure the input image are the same size.
*
Allocate the image arrays and read
*
the image data.
*
**********************************************/
if(are_not_same_size(name1, name2)){
printf(
"\n Images %s and %s are not the same size",
name1, name2);
exit(1);
} /* ends if sizes not the same */
get_image_size(name1, &length, &width);
the_image = allocate_image_array(length, width);
out_image = allocate_image_array(length, width);
create_image_file(name1, name3);
read_image_array(name1, the_image);
read_image_array(name2, out_image);
/*********************************************
*
*
Apply the desired overlay function.
*
**********************************************/
/* non-zero */
if(strncmp("non", type, 3) == 0){
non_zero_overlay(the_image, out_image,
length,
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F.13. CODE LISTINGS FOR CHAPTER 13
623
width);
} /* ends non_zero operation */
/* zero */
if(strcmp("zero", type) == 0){
zero_overlay(the_image, out_image,
length,
width);
} /* ends zero operation */
/* greater */
if(strncmp("gre", type, 3) == 0){
greater_overlay(the_image, out_image,
length,
width);
} /* ends greater operation */
/* less */
if(strncmp("les", type, 3) == 0){
less_overlay(the_image, out_image,
length,
width);
} /* ends less operation */
/* average */
if(strncmp("ave", type, 3) == 0){
average_overlay(the_image, out_image,
length,
width);
} /* ends average operation */
write_image_array(name3, out_image);
free_image_array(out_image, length);
free_image_array(the_image, length);
} /* ends main */
Listing 12.5 - The mainover Program
F.13 Code Listings for Chapter 13
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624
APPENDIX F. SOURCE CODE LISTINGS
/********************************************
*
*
file geosubs.c
*
*
Functions: This file contains
*
geometry
*
arotate
*
bilinear_interpolate
*
*
Purpose:
*
These functions performs different
*
geometric operations.
*
*
External Calls:
*
none
*
*
Modifications:
*
20 October 1993- created
*
27 August 1998 - modified to work on
*
entire images at once.
*
********************************************/
#include "cips.h"
#define FILL 150
/*******************************************
*
*
geometry(..
*
*
This routine performs geometric
*
transformations on the pixels in an
*
image array. It performs basic
*
displacement, stretching, and rotation.
*
*
The basic equations are:
*
*
new x = x.cos(a) + y.sin(a) + x_displace
*
+ x.x_stretch +x.y.x_cross
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F.13. CODE LISTINGS FOR CHAPTER 13
625
*
*
new y = y.cos(a) - x.sin(a) + y_displace
*
+ y.y_stretch +x.y.y_cross
*
*******************************************/
geometry(the_image, out_image,
x_angle,
x_stretch, y_stretch,
x_displace, y_displace,
x_cross, y_cross,
bilinear,
rows,
cols)
float x_angle, x_stretch, y_stretch,
x_cross, y_cross;
int
bilinear;
long
cols, rows;
short **the_image,
**out_image,
x_displace, y_displace;
{
double cosa, sina, radian_angle, tmpx, tmpy;
float fi, fj, x_div, y_div, x_num, y_num;
int
i, j, new_i, new_j;
/******************************
*
*
Load the terms array with
*
the correct parameters.
*
*******************************/
/* the following magic number is from
180 degrees divided by pi */
radian_angle = x_angle/57.29577951;
cosa = cos(radian_angle);
sina = sin(radian_angle);
/************************************
*
*
NOTE: You divide by the
*
stretching factors. Therefore, if
626
APPENDIX F. SOURCE CODE LISTINGS
*
they are zero, you divide by 1.
*
You do this with the x_div y_div
*
variables. You also need a
*
numerator term to create a zero
*
product. You do this with the
*
x_num and y_num variables.
*
*************************************/
if(x_stretch < 0.00001){
x_div = 1.0;
x_num = 0.0;
}
else{
x_div = x_stretch;
x_num = 1.0;
}
if(y_stretch < 0.00001){
y_div = 1.0;
y_num = 0.0;
}
else{
y_div = y_stretch;
y_num = 1.0;
}
/**************************
*
*
Loop over image array
*
**************************/
printf("\n");
for(i=0; i<rows; i++){
if( (i%10) == 0) printf("%d ", i);
for(j=0; j<cols; j++){
fi = i;
fj = j;
tmpx = (double)(j)*cosa
+
(double)(i)*sina
+
(double)(x_displace)
+
(double)(x_num*fj/x_div) +
F.13. CODE LISTINGS FOR CHAPTER 13
627
(double)(x_cross*i*j);
tmpy = (double)(i)*cosa
-
(double)(j)*sina
+
(double)(y_displace)
+
(double)(y_num*fi/y_div) +
(double)(y_cross*i*j);
if(x_stretch != 0.0)
tmpx = tmpx - (double)(fj*cosa + fi*sina);
if(y_stretch != 0.0)
tmpy = tmpy - (double)(fi*cosa - fj*sina);
new_j = tmpx;
new_i = tmpy;
if(bilinear == 0){
if(new_j < 0
||
new_j >= cols
||
new_i < 0
||
new_i >= rows)
out_image[i][j] = FILL;
else
out_image[i][j] =
the_image[new_i][new_j];
} /* ends if bilinear */
else{
out_image[i][j] =
bilinear_interpolate(the_image,
tmpx, tmpy,
rows, cols);
} /* ends bilinear if */
} /* ends loop over j */
} /* ends loop over i */
} /* ends geometry */
/*******************************************
*
*
arotate(..
*
628
APPENDIX F. SOURCE CODE LISTINGS
*
This routine performs rotation about
*
any point m,n.
*
*
The basic equations are:
*
*
new x = x.cos(a) - y.sin(a)
*
-m.cos(a) + m + n.sin(a)
*
*
new y = y.cos(a) + x.sin(a)
*
-m.sin(a) - n.cos(a) + n
*
*******************************************/
arotate(the_image, out_image,
angle,
m, n, bilinear,
rows, cols)
float angle;
int
bilinear;
long
cols, rows;
short **the_image,
**out_image,
m, n;
{
double cosa, sina, radian_angle, tmpx, tmpy;
int
i, j, new_i, new_j;
/* the following magic number is from
180 degrees divided by pi */
radian_angle = angle/57.29577951;
cosa = cos(radian_angle);
sina = sin(radian_angle);
/**************************
*
*
Loop over image array
*
**************************/
printf("\n");
for(i=0; i<rows; i++){
if( (i%10) == 0) printf("%d ", i);
for(j=0; j<cols; j++){
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