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F.13. CODE LISTINGS FOR CHAPTER 13
639
float
x_stretch, y_stretch;
int
bilinear;
long
tmp_length, tmp_width;
long
length, width;
struct bmpfileheader
bmp_file_header;
struct bitmapheader
bmheader;
struct bitmapheader
bmheader2;
struct tiff_header_struct tiff_file_header;
struct tiff_header_struct tiff_file_header2;
/******************************************
*
* Interpret the command line parameters.
*
*******************************************/
if(argc < 6 || argc > 6){
printf(
"\n"
"\n usage: stretch in-file out-file x-stretch "
"y-stretch bilinear (1 or 0)"
"\n");
exit(0);
}
strcpy(in_name, argv[1]);
strcpy(out_name, argv[2]);
x_stretch = atof(argv[3]);
y_stretch = atof(argv[4]);
bilinear = atoi(argv[5]);
if(does_not_exist(in_name)){
printf("\nERROR input file %s does not exist",
in_name);
exit(0);
}
/********************************************
*
*
Create an output file different in size
*
from the input file.
*
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640
APPENDIX F. SOURCE CODE LISTINGS
********************************************/
get_image_size(in_name, &length, &width);
tmp_length = ((float)(length)*y_stretch);
tmp_width = ((float)(width)*x_stretch);
create_resized_image_file(in_name, out_name,
tmp_length, tmp_width);
the_image = allocate_image_array(length, width);
out_image = allocate_image_array(tmp_length, tmp_width);
read_image_array(in_name, the_image);
stretch(the_image, out_image,
x_stretch, y_stretch,
bilinear,
tmp_length,
tmp_width,
length,
width);
write_image_array(out_name, out_image);
free_image_array(out_image, tmp_length);
free_image_array(the_image, length);
} /* ends main */
/*******************************************
*
*
stretch(..
*
*
This routine performs the image
*
stretching. If bilinear == 0, it uses
*
the roundoff approach for enlarging
*
an area. If bilinear == 1, it calls the
*
bilinear_interpolate routine to get
*
the value of a pixel that lies
*
between pixels.
*
********************************************/
stretch(the_image, out_image,
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F.13. CODE LISTINGS FOR CHAPTER 13
641
x_stretch, y_stretch,
bilinear,
out_rows, out_cols,
in_rows, in_cols)
float x_stretch, y_stretch;
int
bilinear;
short **the_image,
**out_image;
long
out_cols, out_rows;
long
in_cols, in_rows;
{
double tmpx, tmpy;
float fi, fj;
int
i, j, new_i, new_j;
/**************************
*
*
Loop over image array
*
**************************/
printf("\n");
for(i=0; i<out_rows; i++){
if( (i%10) == 0) printf("%d ", i);
for(j=0; j<out_cols; j++){
fi = i;
fj = j;
tmpx = fj/x_stretch;
tmpy = fi/y_stretch;
new_i = tmpy;
new_j = tmpx;
if(bilinear == 0){
if(new_j < 0
||
new_j >= in_cols
||
new_i < 0
||
new_i >= in_rows)
out_image[i][j] = FILL;
else
out_image[i][j] =
the_image[new_i][new_j];
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642
APPENDIX F. SOURCE CODE LISTINGS
} /* ends if bilinear */
else{
out_image[i][j] =
bilinear_interpolate(the_image,
tmpx, tmpy,
in_rows, in_cols);
} /* ends bilinear if */
} /* ends loop over j */
} /* ends loop over i */
} /* ends stretch */
Listing 13.3 - The stretch Program
F.14 Code Listings for Chapter 14
/***********************************************
*
*
file warpsubs.c
*
*
Functions: This file contains
*
warp
*
warp_loop
*
bi_warp_loop
*
object_warp
*
full_warp_loop
*
bi_full_warp_loop
*
get_warp_options
*
*
Purpose:
*
These functions performs different
*
geometric operations.
*
*
External Calls:
*
geosubs.c - bilinear_interpolate
*
*
Modifications:
*
20 October 1993- created
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F.14. CODE LISTINGS FOR CHAPTER 14
643
*
27 August 1998 - modified to work on
*
entire images at once.
*
*************************************************/
#include "cips.h"
#define FILL 150
/*******************************************
*
*
warp(..
*
*
This routine warps a rowsxcols section
*
of an image. The il, ie parameters
*
specify which rowsxcols section of
*
the image to warp. The x_control and
*
y_control parameters are the control
*
points inside that section. Therefore,
*
x_control and y_control will always be
*
less the cols and rows.
*
*
The point coordinates are for the four
*
corners of a four side figure.
*
x1,y1
x2,y2
*
*
x4,y4
x3,y3
*
*******************************************/
warp(the_image, out_image,
x_control, y_control,
bilinear,
rows, cols)
int
bilinear, x_control, y_control;
long
cols, rows;
short **the_image,
**out_image;
{
int
cols_div_2, extra_x, extra_y, i, j,
rows_div_2, x1, x2, x3, x4, y1, y2, y3, y4;
cols_div_2 = cols/2;
rows_div_2 = rows/2;
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644
APPENDIX F. SOURCE CODE LISTINGS
/***********************************
*
*
1 - upper left quarter
*
***********************************/
x1 = 0;
x2 = cols_div_2;
x3 = x_control;
x4 = 0;
y1 = 0;
y2 = 0;
y3 = y_control;
y4 = rows_div_2;
extra_x = 0;
extra_y = 0;
if(bilinear)
bi_warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
else
warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
/***********************************
*
*
2 - upper right quarter
*
***********************************/
x1 = cols_div_2;
x2 = cols-1;
x3 = cols-1;
x4 = x_control;
y1 = 0;
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F.14. CODE LISTINGS FOR CHAPTER 14
645
y2 = 0;
y3 = rows_div_2;
y4 = y_control;
extra_x = cols_div_2;
extra_y = 0;
if(bilinear)
bi_warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
else
warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
/***********************************
*
*
3 - lower right quarter
*
***********************************/
x1 = x_control;
x2 = cols-1;
x3 = cols-1;
x4 = cols_div_2;
y1 = y_control;
y2 = rows_div_2;
y3 = rows-1;
y4 = rows-1;
extra_x = cols_div_2;
extra_y = rows_div_2;
if(bilinear)
bi_warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
646
APPENDIX F. SOURCE CODE LISTINGS
rows, cols);
else
warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
/***********************************
*
*
4 - lower left quarter
*
***********************************/
x1 = 0;
x2 = x_control;
x3 = cols_div_2;
x4 = 0;
y1 = rows_div_2;
y2 = y_control;
y3 = rows-1;
y4 = rows-1;
extra_x = 0;
extra_y = rows_div_2;
if(bilinear)
bi_warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
else
warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
} /* ends warp */
F.14. CODE LISTINGS FOR CHAPTER 14
647
/*******************************************
*
*
warp_loop(..
*
*
This routine sets up the coefficients
*
and loops through a quarter of the
*
rowsxcols section of the image that
*
is being warped.
*
*******************************************/
warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols)
int
extra_x, extra_y,
x1, x2, x3, x4,
y1, y2, y3, y4;
long
cols, rows;
short **the_image,
**out_image;
{
int
cols_div_2, denom, i, j, rows_div_2,
xa, xb, xab, x_out, ya, yb, yab, y_out;
cols_div_2 = cols/2;
rows_div_2 = rows/2;
denom
= cols_div_2 * rows_div_2;
/***********************************
*
*
Set up the terms for the
*
spatial transformation.
*
***********************************/
xa = x2 - x1;
xb = x4 - x1;
xab = x1 - x2 + x3 - x4;
ya = y2 - y1;
yb = y4 - y1;
yab = y1 - y2 + y3 - y4;
648
APPENDIX F. SOURCE CODE LISTINGS
/***********************************
*
*
Loop through a quadrant and
*
perform the spatial
*
transformation.
*
***********************************/
/* NOTE a=j b=i */
printf("\n");
for(i=0; i<rows_div_2; i++){
if( (i%10) == 0) printf("%d ", i);
for(j=0; j<cols_div_2; j++){
x_out = x1 + (xa*j)/cols_div_2 +
(xb*i)/rows_div_2 + (xab*i*j)/(denom);
y_out = y1 + (ya*j)/cols_div_2 +
(yb*i)/rows_div_2 + (yab*i*j)/(denom);
if(x_out < 0
||
x_out >= cols
||
y_out < 0
||
y_out >= rows)
out_image[i+extra_y][j+extra_x] = FILL;
else
out_image[i+extra_y][j+extra_x] =
the_image[y_out][x_out];
} /* ends loop over j */
} /* ends loop over i */
}
/* ends warp_loop */
/*******************************************
*
*
bi_warp_loop(..
*
*
This routine sets up the coefficients
*
and loops through a quarter of the
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