/*
Draws a set of features on an image
@param img image on which to draw features
@param feat array of Oxford-type features
@param n number of features
*/
void draw_features( IplImage* img, struct feature* feat, int n )
{
int type;
if( n <= 0 || ! feat )
{
fprintf( stderr, "Warning: no features to draw, %s line %d\n",
__FILE__, __LINE__ );
return;
}
type = feat[0].type;
switch( type )
{
case FEATURE_OXFD:
draw_oxfd_features( img, feat, n );
break;
case FEATURE_LOWE:
draw_lowe_features( img, feat, n );
break;
default:
fprintf( stderr, "Warning: draw_features(): unrecognized feature" \
" type, %s, line %d\n", __FILE__, __LINE__ );
break;
}
}
/*
Draws a set of features on an image
@param img image on which to draw features
@param feat array of features
@param n number of features
*/
void draw_features( IplImage* img, struct feature* feat, int n )
{
int type;
//参数合法性检查
if( n <= 0 || ! feat )
{
fprintf( stderr, "Warning: no features to draw, %s line %d\n",
__FILE__, __LINE__ );
return;
}
type = feat[0].type;//特征点的类型
//根据特征点类型，调用不同的函数完成绘图功能
switch( type )
{
case FEATURE_OXFD:
draw_oxfd_features( img, feat, n );//调用函数，在图像上画OXFD格式特征点
break;
case FEATURE_LOWE:
draw_lowe_features( img, feat, n );//调用函数，在图像上画LOWE格式特征点
break;
default:
fprintf( stderr, "Warning: draw_features(): unrecognized feature" \
" type, %s, line %d\n", __FILE__, __LINE__ );
break;
}
}
