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F.14. CODE LISTINGS FOR CHAPTER 14
649
*
rowsxcols section of the image that
*
is being warped.
*
*
This version of the routine uses bilinear
*
interpolation to find the gray shades.
*
It is more accurate than warp_loop,
*
but takes longer because of the floating
*
point calculations.
*
*******************************************/
bi_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;
{
double cols_div_2, denom, di, dj, rows_div_2,
xa, xb, xab, x_out, ya, yb, yab, y_out;
int
i, j;
cols_div_2 = (double)(cols)/2.0;
rows_div_2 = (double)(rows)/2.0;
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;
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650
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++){
di = (double)(i);
dj = (double)(j);
x_out = x1 +
(xa*dj)/cols_div_2 +
(xb*di)/rows_div_2 +
(xab*di*dj)/(denom);
y_out = y1 +
(ya*dj)/cols_div_2 +
(yb*di)/rows_div_2 +
(yab*di*dj)/(denom);
out_image[i+extra_y][j+extra_x] =
bilinear_interpolate(the_image,
x_out, y_out,
rows, cols);
} /* ends loop over j */
} /* ends loop over i */
}
/* ends bi_warp_loop */
/*******************************************
*
*
object_warp(..
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F.14. CODE LISTINGS FOR CHAPTER 14
651
*
*
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
*
*******************************************/
object_warp(the_image, out_image,
x1, y1, x2, y2,
x3, y3, x4, y4,
bilinear, rows, cols)
int
bilinear,
x1, y1, x2, y2,
x3, y3, x4, y4;
long
cols, rows;
short **the_image,
**out_image;
{
int
extra_x = 0,
extra_y = 0;
/***********************************
*
*
Call the warp loop function you
*
need (with or without bilinear
*
interpolation).
*
***********************************/
if(bilinear)
bi_full_warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
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652
APPENDIX F. SOURCE CODE LISTINGS
rows, cols);
else
full_warp_loop(the_image, out_image,
x1, x2, x3, x4,
y1, y2, y3, y4,
extra_x, extra_y,
rows, cols);
} /* ends object_warp */
/*******************************************
*
*
full_warp_loop(..
*
*
This routine sets up the coefficients
*
and loops through an entire
*
rowsxcols image that is being warped.
*
*******************************************/
full_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;
denom
= cols * rows;
/***********************************
*
*
Set up the terms for the
*
spatial transformation.
*
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F.14. CODE LISTINGS FOR CHAPTER 14
653
***********************************/
xa = x2 - x1;
xb = x4 - x1;
xab = x1 - x2 + x3 - x4;
ya = y2 - y1;
yb = y4 - y1;
yab = y1 - y2 + y3 - y4;
/***********************************
*
*
Loop through the image and
*
perform the spatial
*
transformation.
*
***********************************/
/* NOTE a=j b=i */
printf("\n");
for(i=0; i<rows; i++){
if( (i%10) == 0) printf("%d ", i);
for(j=0; j<cols; j++){
x_out = x1 + (xa*j)/cols +
(xb*i)/rows + (xab*i*j)/(denom);
y_out = y1 + (ya*j)/cols +
(yb*i)/rows + (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 full_warp_loop */
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654
APPENDIX F. SOURCE CODE LISTINGS
/*******************************************
*
*
bi_full_warp_loop(..
*
*
This routine sets up the coefficients
*
and loops through an entire
*
rowsxcols image that is being warped.
*
*
This version of the routine uses bilinear
*
interpolation to find the gray shades.
*
It is more accurate than warp_loop,
*
but takes longer because of the floating
*
point calculations.
*
*******************************************/
bi_full_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;
{
double denom, di, dj,
xa, xb, xab, x_out, ya, yb, yab, y_out;
int
i, j;
denom
= cols * rows;
/***********************************
*
*
Set up the terms for the
*
spatial transformation.
*
***********************************/
xa = x2 - x1;
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F.14. CODE LISTINGS FOR CHAPTER 14
655
xb = x4 - x1;
xab = x1 - x2 + x3 - x4;
ya = y2 - y1;
yb = y4 - y1;
yab = y1 - y2 + y3 - y4;
/***********************************
*
*
Loop through the image and
*
perform the spatial
*
transformation.
*
***********************************/
/* NOTE a=j b=i */
printf("\n");
for(i=0; i<rows; i++){
if( (i%10) == 0) printf("%d ", i);
for(j=0; j<cols; j++){
di = (double)(i);
dj = (double)(j);
x_out = x1 +
(xa*dj)/cols +
(xb*di)/rows +
(xab*di*dj)/(denom);
y_out = y1 +
(ya*dj)/cols +
(yb*di)/rows +
(yab*di*dj)/(denom);
out_image[i+extra_y][j+extra_x] =
bilinear_interpolate(the_image,
x_out, y_out,
rows, cols);
} /* ends loop over j */
} /* ends loop over i */
}
/* ends bi_full_warp_loop */
656
APPENDIX F. SOURCE CODE LISTINGS
Listing 14.1 - The Warping Subroutines
echo off
rem
Usage:
rem
morphit in1 in2 working-dir output
rem
rem
Example:
rem
morphit c:a.tif c:b.tif d: c:out.tif
rem
rem
This will morph c:a.tif and c:b.tif
rem
and put the output in c:out.tif
rem
It will also create temporary files in
rem
d: and then delete them.
rem
Check for the right number of parameters
if "%4" == "" goto usage
warp %1 %3in1w1.tif object 10 10 90 10 90 90 10 90 1 1 0
warp %3in1w1.tif %3in1w2.tif object 10 10 90 10 90 90 10 90 1 1 0
warp %2 %3in2w1.tif object -10 -10 110 -10 110 110 -10 110 1 1 0
warp %3in2w1.tif %3in2w2.tif object -10 -10 110 -10 110 110 -10 110 1 1 0
rem Average input 1 with the second warp of input 2
rem Weight input 1 twice as much
rem Put the result in file 1.tif
mainover %1 %3in2w2.tif %3tmp1.tif average 1 1
mainover %1 %3tmp1.tif %3tmp2.tif average 1 1
copy %3tmp2.tif %31.tif
rem Average input 2 with the second warp of input 1
rem Weight input 2 twice as much
rem Put the result in file 3.tif
mainover %2 %3in1w2.tif %3tmp1.tif average 1 1
mainover %2 %3tmp1.tif %3tmp2.tif average 1 1
copy %3tmp2.tif %33.tif
F.14. CODE LISTINGS FOR CHAPTER 14
657
rem Average the first warps of the two inputs
rem Put the result in file 2.tif
mainover %3in2w1.tif %3in1w1.tif %3tmp1.tif average 1 1
copy %3tmp1.tif %32.tif
del %3tmp1.tif
del %3tmp2.tif
rem Now put the images side by side
rem in the sequence: in1 1 2 3 in2
side %1 %31.tif %3tmp1.tif side
side %3tmp1.tif %32.tif %3tmp2.tif side
del %3tmp1.tif
side %3tmp2.tif %33.tif %3tmp1.tif side
side %3tmp1.tif %2 %4 side
del %3tmp1.tif
del %3tmp2.tif
del %31.tif
del %32.tif
del %33.tif
del %3in1w1.tif
del %3in1w2.tif
del %3in2w1.tif
del %3in2w2.tif
goto end
:usage
echo .
echo usage: morphit in1 in2 working-dir output
echo .
:end
Listing 14.2 - The .bat File that Produced the Morphing Sequence (Figure
14.10)
658
APPENDIX F. SOURCE CODE LISTINGS
/********************************************
*
*
file warp.c
*
*
Functions: This file contains
*
main
*
*
Purpose:
*
This file contains the main calling
*
routine for warping subroutines.
*
*
External Calls:
*
imageio.c - create_image_file
*
read_image_array
*
write_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
warpsubs.c - warp
*
object_warp
*
*
Modifications:
*
26 October 1993 - created
*
27 August 1998 - modified to work on
*
entire images at once.
*
19 September 1998 - modified to work with
*
all I O routines in imageio.c.
*
********************************************/
#include "cips.h"
short **the_image;
short **out_image;
main(argc, argv)
int argc;
char *argv[];
{
char
name1[80], name2[80], type[80];
float theta, x_stretch, y_stretch,
x_cross, y_cross;
int
bilinear,
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