/*
Reads image features from file. The file should be formatted as from
the code provided by the Visual Geometry Group at Oxford:
@param filename location of a file containing image features
@param type determines how features are input. If \a type is FEATURE_OXFD,
the input file is treated as if it is from the code provided by the VGG
at Oxford:http://www.robots.ox.ac.uk:5000/~vgg/research/affine/index.html
If \a type is FEATURE_LOWE, the input file is treated as if it is from
David Lowe's SIFT code:http://www.cs.ubc.ca/~lowe/keypoints
@param feat pointer to an array in which to store features
@return Returns the number of features imported from filename or -1 on error
*/
int import_features( char* filename, int type, struct feature** feat )
{
int n;
//根据特征点类型，调用不同的函数完成导入功能
switch( type )
{
case FEATURE_OXFD:
n = import_oxfd_features( filename, feat );//调用函数，导入OXFD格式特征点
break;
case FEATURE_LOWE:
n = import_lowe_features( filename, feat );//调用函数，导入LOWE格式特征点
break;
default: //特征点格式无法识别
fprintf( stderr, "Warning: import_features(): unrecognized feature" \
"type, %s, line %d\n", __FILE__, __LINE__ );
return -1;
}
//导入失败
if( n == -1 )
fprintf( stderr, "Warning: unable to import features from %s," \
" %s, line %d\n", filename, __FILE__, __LINE__ );
return n;
}
/*
Reads image features from file. The file should be formatted as from
the code provided by the Visual Geometry Group at Oxford:
@param filename location of a file containing image features
@param type determines how features are input. If \a type is FEATURE_OXFD,
the input file is treated as if it is from the code provided by the VGG
at Oxford:
http://www.robots.ox.ac.uk:5000/~vgg/research/affine/index.html
If \a type is FEATURE_LOWE, the input file is treated as if it is from
David Lowe's SIFT code:
http://www.cs.ubc.ca/~lowe/keypoints
@param features pointer to an array in which to store features
@return Returns the number of features imported from filename or -1 on error
*/
int import_features( char* filename, int type, struct feature** feat )
{
int n;
switch( type )
{
case FEATURE_OXFD:
n = import_oxfd_features( filename, feat );
break;
case FEATURE_LOWE:
n = import_lowe_features( filename, feat );
break;
default:
fprintf( stderr, "Warning: import_features(): unrecognized feature type, %s, line %d\n", __FILE__, __LINE__ );
return -1;
}
if( n == -1 )
fprintf( stderr, "Warning: unable to import features from %s, %s, line %d\n", filename, __FILE__, __LINE__ );
return n;
}