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|
/* im_gradcor
*
* Copyright: 2007 Nottingham Trent University
*
* Author: Tom Vajzovic
* Written on: 2007-06-07
* 3/2/10
* - gtkdoc
* - cleanups
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/** HEADERS **/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdlib.h>
#include <vips/vips.h>
/** LOCAL TYPES **/
typedef struct {
REGION *reg;
int *region_xgrad;
int *region_ygrad;
size_t region_xgrad_area;
size_t region_ygrad_area;
}
gradcor_seq_t;
/** LOCAL FUNCTION DECLARATIONS **/
static void *gradcor_start( IMAGE *out, void *vptr_large, void *unrequired );
static int gradcor_stop( void *vptr_seq, void *unrequired, void *unreq2 );
static int gradcor_gen( REGION *to_make, void *vptr_seq, void *unrequired, void *vptr_grads );
#define XGRAD_GEN_DECLARATION( TYPE ) static int xgrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 )
#define YGRAD_GEN_DECLARATION( TYPE ) static int ygrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 )
XGRAD_GEN_DECLARATION( guint8 );
YGRAD_GEN_DECLARATION( guint8 );
XGRAD_GEN_DECLARATION( gint8 );
YGRAD_GEN_DECLARATION( gint8 );
XGRAD_GEN_DECLARATION( guint16 );
YGRAD_GEN_DECLARATION( guint16 );
XGRAD_GEN_DECLARATION( gint16 );
YGRAD_GEN_DECLARATION( gint16 );
XGRAD_GEN_DECLARATION( guint32 );
YGRAD_GEN_DECLARATION( guint32 );
XGRAD_GEN_DECLARATION( gint32 );
YGRAD_GEN_DECLARATION( gint32 );
#if 0
XGRAD_GEN_DECLARATION( float );
YGRAD_GEN_DECLARATION( float );
XGRAD_GEN_DECLARATION( double );
YGRAD_GEN_DECLARATION( double );
#endif
/** EXPORTED FUNCTION DEFINITIONS **/
int im_gradcor_raw( IMAGE *large, IMAGE *small, IMAGE *out ){
#define FUNCTION_NAME "im_gradcor_raw"
if( im_piocheck( large, out ) || im_pincheck( small ) )
return -1;
if( im_check_uncoded( "im_gradcor", large ) ||
im_check_mono( "im_gradcor", large ) ||
im_check_uncoded( "im_gradcor", small ) ||
im_check_mono( "im_gradcor", small ) ||
im_check_format_same( "im_gradcor", large, small ) ||
im_check_int( "im_gradcor", large ) )
return( -1 );
if( large-> Xsize < small-> Xsize || large-> Ysize < small-> Ysize ){
im_error( FUNCTION_NAME, "second image must be smaller than first" );
return -1;
}
if( im_cp_desc( out, large ) )
return -1;
out-> Xsize= 1 + large-> Xsize - small-> Xsize;
out-> Ysize= 1 + large-> Ysize - small-> Ysize;
out-> BandFmt= IM_BANDFMT_FLOAT;
if( im_demand_hint( out, IM_FATSTRIP, large, NULL ) )
return -1;
{
IMAGE *xgrad= im_open_local( out, FUNCTION_NAME ": xgrad", "t" );
IMAGE *ygrad= im_open_local( out, FUNCTION_NAME ": ygrad", "t" );
IMAGE **grads= im_allocate_input_array( out, xgrad, ygrad, NULL );
return ! xgrad || ! ygrad || ! grads
|| im_grad_x( small, xgrad )
|| im_grad_y( small, ygrad )
|| im_generate( out, gradcor_start, gradcor_gen, gradcor_stop, (void*) large, (void*) grads );
}
#undef FUNCTION_NAME
}
/**
* im_gradcor:
* @in: input image
* @ref: reference image
* @out: output image
*
* Calculate a correlation surface.
*
* @ref is placed at every position in @in and a correlation coefficient
* calculated. One-band, integer images only. @in and @ref must have the
* same #VipsBandFmt. The output
* image is always %IM_BANDFMT_FLOAT. @ref must be smaller than @in. The output
* image is the same size as the input.
*
* The method takes the gradient images of the two images then takes the
* dot-product correlation of the two vector images.
* The vector expression of this method is my (tcv) own creation. It is
* equivalent to the complex-number method of:
*
* ARGYRIOU, V. et al. 2003. Estimation of sub-pixel motion using
* gradient cross correlation. Electronics Letters, 39 (13).
*
* See also: im_spcor().
*
* Returns: 0 on success, -1 on error
*/
int
im_gradcor( IMAGE *in, IMAGE *ref, IMAGE *out )
{
#define FUNCTION_NAME "im_gradcor"
IMAGE *t1 = im_open_local( out, FUNCTION_NAME " intermediate", "p" );
if( !t1 ||
im_embed( in, t1, 1,
ref->Xsize / 2, ref->Ysize / 2,
in->Xsize + ref->Xsize - 1,
in->Ysize + ref->Ysize - 1 ) ||
im_gradcor_raw( t1, ref, out ) )
return( -1 );
out->Xoffset = 0;
out->Yoffset = 0;
return( 0 );
#undef FUNCTION_NAME
}
/**
* im_grad_x:
* @in: input image
* @out: output image
*
* Find horizontal differences between adjacent pixels.
*
* Generates an image where the value of each pixel is the difference between
* it and the pixel to its right. The output has the same height as the input
* and one pixel less width. One-band integer formats only. The result is
* always %IM_BANDFMT_INT.
*
* This operation is much faster than (though equivalent to) im_conv() with the
* mask [[-1, 1]].
*
* See also: im_grad_y(), im_conv().
*
* Returns: 0 on success, -1 on error
*/
int im_grad_x( IMAGE *in, IMAGE *out ){
#define FUNCTION_NAME "im_grad_x"
if( im_piocheck( in, out ) )
return -1;
if( im_check_uncoded( "im_grad_x", in ) ||
im_check_mono( "im_grad_x", in ) ||
im_check_int( "im_grad_x", in ) )
return( -1 );
if( im_cp_desc( out, in ) )
return -1;
-- out-> Xsize;
out-> BandFmt= IM_BANDFMT_INT; /* do not change without updating im_gradcor() */
if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) )
return -1;
#define RETURN_GENERATE( TYPE ) return im_generate( out, im_start_one, xgrad_gen_ ## TYPE, im_stop_one, (void*) in, NULL )
switch( in-> BandFmt ){
case IM_BANDFMT_UCHAR:
RETURN_GENERATE( guint8 );
case IM_BANDFMT_CHAR:
RETURN_GENERATE( gint8 );
case IM_BANDFMT_USHORT:
RETURN_GENERATE( guint16 );
case IM_BANDFMT_SHORT:
RETURN_GENERATE( gint16 );
case IM_BANDFMT_UINT:
RETURN_GENERATE( guint32 );
case IM_BANDFMT_INT:
RETURN_GENERATE( gint32 );
#if 0
case IM_BANDFMT_FLOAT:
RETURN_GENERATE( float );
case IM_BANDFMT_DOUBLE:
RETURN_GENERATE( double );
#endif
#undef RETURN_GENERATE
default:
g_assert( 0 );
}
/* Keep gcc happy.
*/
return 0;
#undef FUNCTION_NAME
}
/**
* im_grad_y:
* @in: input image
* @out: output image
*
* Find vertical differences between adjacent pixels.
*
* Generates an image where the value of each pixel is the difference between
* it and the pixel below it. The output has the same width as the input
* and one pixel less height. One-band integer formats only. The result is
* always %IM_BANDFMT_INT.
*
* This operation is much faster than (though equivalent to) im_conv() with the
* mask [[-1], [1]].
*
* See also: im_grad_x(), im_conv().
*
* Returns: 0 on success, -1 on error
*/
int im_grad_y( IMAGE *in, IMAGE *out ){
#define FUNCTION_NAME "im_grad_y"
if( im_piocheck( in, out ) )
return -1;
if( im_check_uncoded( "im_grad_y", in ) ||
im_check_mono( "im_grad_y", in ) ||
im_check_int( "im_grad_y", in ) )
return( -1 );
if( im_cp_desc( out, in ) )
return -1;
-- out-> Ysize;
out-> BandFmt= IM_BANDFMT_INT; /* do not change without updating im_gradcor() */
if( im_demand_hint( out, IM_FATSTRIP, in, NULL ) )
return -1;
#define RETURN_GENERATE( TYPE ) return im_generate( out, im_start_one, ygrad_gen_ ## TYPE, im_stop_one, (void*) in, NULL )
switch( in-> BandFmt ){
case IM_BANDFMT_UCHAR:
RETURN_GENERATE( guint8 );
case IM_BANDFMT_CHAR:
RETURN_GENERATE( gint8 );
case IM_BANDFMT_USHORT:
RETURN_GENERATE( guint16 );
case IM_BANDFMT_SHORT:
RETURN_GENERATE( gint16 );
case IM_BANDFMT_UINT:
RETURN_GENERATE( guint32 );
case IM_BANDFMT_INT:
RETURN_GENERATE( gint32 );
#if 0
case IM_BANDFMT_FLOAT:
RETURN_GENERATE( float );
case IM_BANDFMT_DOUBLE:
RETURN_GENERATE( double );
#endif
#undef RETURN_GENERATE
default:
g_assert( 0 );
}
/* Keep gcc happy.
*/
return 0;
#undef FUNCTION_NAME
}
/** LOCAL FUNCTION DEFINITIONS **/
static void *gradcor_start( IMAGE *out, void *vptr_large, void *unrequired ){
gradcor_seq_t *seq= IM_NEW( NULL, gradcor_seq_t );
if( ! seq )
return NULL;
seq-> region_xgrad= (int*) NULL;
seq-> region_ygrad= (int*) NULL;
seq-> region_xgrad_area= 0;
seq-> region_ygrad_area= 0;
seq-> reg= im_region_create( (IMAGE*) vptr_large );
if( ! seq-> reg ){
im_free( (void*) seq );
return NULL;
}
return (void*) seq;
}
static int gradcor_stop( void *vptr_seq, void *unrequired, void *unreq2 ){
gradcor_seq_t *seq= (gradcor_seq_t*) vptr_seq;
if( seq ){
im_free( (void*) seq-> region_xgrad );
im_free( (void*) seq-> region_ygrad );
im_region_free( seq-> reg );
seq-> region_xgrad= (int*) NULL;
seq-> region_ygrad= (int*) NULL;
seq-> reg= (REGION*) NULL;
im_free( (void*) seq );
}
return 0;
}
static int gradcor_gen( REGION *to_make, void *vptr_seq, void *unrequired, void *vptr_grads ){
gradcor_seq_t *seq= (gradcor_seq_t*) vptr_seq;
REGION *make_from= seq-> reg;
IMAGE **grads= (IMAGE**) vptr_grads;
IMAGE *small_xgrad= grads[0];
IMAGE *small_ygrad= grads[1];
Rect require= {
to_make-> valid. left,
to_make-> valid. top,
to_make-> valid. width + small_xgrad-> Xsize,
to_make-> valid. height + small_ygrad-> Ysize
};
size_t region_xgrad_width= require. width - 1;
size_t region_ygrad_height= require. height - 1;
if( im_prepare( make_from, &require ) )
return -1;
#define FILL_BUFFERS( TYPE ) /* fill region_xgrad */ \
{ \
TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
size_t read_skip= ( IM_REGION_LSKIP( make_from ) / sizeof(TYPE) ) - region_xgrad_width; \
size_t area_need= region_xgrad_width * require. height; \
\
if( seq-> region_xgrad_area < area_need ){ \
free( seq-> region_xgrad ); \
seq-> region_xgrad= malloc( area_need * sizeof(int) ); \
if( ! seq-> region_xgrad ) \
return -1; \
seq-> region_xgrad_area= area_need; \
} \
{ \
int *writing= seq-> region_xgrad; \
int *write_end= writing + area_need; \
int *write_stop; \
for( ; writing < write_end; reading+= read_skip ) \
for( write_stop= writing + region_xgrad_width; writing < write_stop; ++reading, ++writing ) \
*writing= reading[1] - reading[0]; \
} \
} \
{ /* fill region_ygrad */ \
TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
size_t read_line= IM_REGION_LSKIP( make_from ) / sizeof(TYPE); \
size_t read_skip= read_line - require. width; \
size_t area_need= require. width * region_ygrad_height; \
\
if( seq-> region_ygrad_area < area_need ){ \
free( seq-> region_ygrad ); \
seq-> region_ygrad= malloc( area_need * sizeof(int) ); \
if( ! seq-> region_ygrad ) \
return -1; \
seq-> region_ygrad_area= area_need; \
} \
{ \
int *writing= seq-> region_ygrad; \
int *write_end= writing + area_need; \
int *write_stop; \
for( ; writing < write_end; reading+= read_skip ) \
for( write_stop= writing + require. width; writing < write_stop; ++reading, ++writing ) \
*writing= reading[ read_line ] - reading[0]; \
} \
}
switch( make_from-> im-> BandFmt ){
case IM_BANDFMT_UCHAR:
FILL_BUFFERS( unsigned char )
break;
case IM_BANDFMT_CHAR:
FILL_BUFFERS( signed char )
break;
case IM_BANDFMT_USHORT:
FILL_BUFFERS( unsigned short int )
break;
case IM_BANDFMT_SHORT:
FILL_BUFFERS( signed short int )
break;
case IM_BANDFMT_UINT:
FILL_BUFFERS( unsigned int )
break;
case IM_BANDFMT_INT:
FILL_BUFFERS( signed int )
break;
default:
g_assert( 0 );
}
{ /* write to output */
size_t write_skip= IM_REGION_LSKIP( to_make ) / sizeof( float );
float *writing= (float*) IM_REGION_ADDR_TOPLEFT( to_make );
float *write_end= writing + write_skip * to_make-> valid. height;
float *write_stop;
size_t write_width= to_make-> valid. width;
size_t small_xgrad_width= small_xgrad-> Xsize;
size_t small_ygrad_width= small_ygrad-> Xsize;
int *small_xgrad_end= (int*) small_xgrad-> data + small_xgrad_width * small_xgrad-> Ysize;
int *small_ygrad_end= (int*) small_ygrad-> data + small_ygrad_width * small_ygrad-> Ysize;
int *region_xgrad_start= seq-> region_xgrad;
int *region_ygrad_start= seq-> region_ygrad;
size_t region_xgrad_start_skip= region_xgrad_width - write_width;
size_t region_ygrad_start_skip= require. width - write_width;
size_t region_xgrad_read_skip= region_xgrad_width - small_xgrad_width;
size_t region_ygrad_read_skip= require. width - small_ygrad_width;
write_skip-= write_width;
for( ; writing < write_end; writing+= write_skip, region_xgrad_start+= region_xgrad_start_skip, region_ygrad_start+= region_ygrad_start_skip )
for( write_stop= writing + write_width; writing < write_stop; ++writing, ++region_xgrad_start, ++region_ygrad_start ){
gint64 sum= 0;
{
int *small_xgrad_read= (int*) small_xgrad-> data;
int *small_xgrad_stop;
int *region_xgrad_read= region_xgrad_start;
for( ; small_xgrad_read < small_xgrad_end; region_xgrad_read+= region_xgrad_read_skip )
for( small_xgrad_stop= small_xgrad_read + small_xgrad_width; small_xgrad_read < small_xgrad_stop; ++small_xgrad_read, ++region_xgrad_read )
sum+= *small_xgrad_read * *region_xgrad_read;
}
{
int *small_ygrad_read= (int*) small_ygrad-> data;
int *small_ygrad_stop;
int *region_ygrad_read= region_ygrad_start;
for( ; small_ygrad_read < small_ygrad_end; region_ygrad_read+= region_ygrad_read_skip )
for( small_ygrad_stop= small_ygrad_read + small_ygrad_width; small_ygrad_read < small_ygrad_stop; ++small_ygrad_read, ++region_ygrad_read )
sum+= *small_ygrad_read * *region_ygrad_read;
}
*writing= sum;
}
}
return 0;
}
#define XGRAD_GEN_DEFINITION( TYPE ) \
static int xgrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 ){ \
\
REGION *make_from= (REGION*) vptr_make_from; \
Rect require= { \
to_make-> valid. left, \
to_make-> valid. top, \
to_make-> valid. width + 1, \
to_make-> valid. height \
}; \
if( im_prepare( make_from, &require ) ) \
return -1; \
\
{ \
int *writing= (int*) IM_REGION_ADDR_TOPLEFT( to_make ); \
size_t write_skip= IM_REGION_LSKIP( to_make ) / sizeof(int); \
int *write_end= writing + write_skip * to_make-> valid. height; \
size_t write_width= to_make-> valid. width; \
int *write_stop; \
\
TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
size_t read_skip= ( IM_REGION_LSKIP( make_from ) / sizeof(TYPE) ) - write_width; \
\
write_skip-= write_width; \
\
for( ; writing < write_end; writing+= write_skip, reading+= read_skip ) \
for( write_stop= writing + write_width; writing < write_stop; ++writing, ++reading ) \
*writing= (int)( reading[1] - reading[0] ); \
} \
return 0; \
}
#define YGRAD_GEN_DEFINITION( TYPE ) \
static int ygrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 ){ \
\
REGION *make_from= (REGION*) vptr_make_from; \
Rect require= { \
to_make-> valid. left, \
to_make-> valid. top, \
to_make-> valid. width, \
to_make-> valid. height + 1 \
}; \
if( im_prepare( make_from, &require ) ) \
return -1; \
\
{ \
int *writing= (int*) IM_REGION_ADDR_TOPLEFT( to_make ); \
size_t write_skip= IM_REGION_LSKIP( to_make ) / sizeof(int); \
int *write_end= writing + write_skip * to_make-> valid. height; \
size_t write_width= to_make-> valid. width; \
int *write_stop; \
\
TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
size_t read_line= IM_REGION_LSKIP( make_from ) / sizeof(TYPE); \
size_t read_skip= read_line - write_width; \
\
write_skip-= write_width; \
\
for( ; writing < write_end; writing+= write_skip, reading+= read_skip ) \
for( write_stop= writing + write_width; writing < write_stop; ++writing, ++reading ) \
*writing= (int)( reading[ read_line ] - reading[0] ); \
} \
return 0; \
}
XGRAD_GEN_DEFINITION( guint8 )
YGRAD_GEN_DEFINITION( guint8 )
XGRAD_GEN_DEFINITION( gint8 )
YGRAD_GEN_DEFINITION( gint8 )
XGRAD_GEN_DEFINITION( guint16 )
YGRAD_GEN_DEFINITION( guint16 )
XGRAD_GEN_DEFINITION( gint16 )
YGRAD_GEN_DEFINITION( gint16 )
XGRAD_GEN_DEFINITION( guint32 )
YGRAD_GEN_DEFINITION( guint32 )
XGRAD_GEN_DEFINITION( gint32 )
YGRAD_GEN_DEFINITION( gint32 )
#if 0
XGRAD_GEN_DEFINITION( float )
YGRAD_GEN_DEFINITION( float )
XGRAD_GEN_DEFINITION( double )
YGRAD_GEN_DEFINITION( double )
#endif
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