Utility functions.

Defines
#define	fatal(E, S,...)   vfatal((E), (S), (tag::Fmt,## __VA_ARGS__))
Functions
vector< string >	split (const string &s)
template<class C>
C	ato (const string &s)
double	sq (double d)
vector< int >	range (int num)
template<class C>
void	vfatal (int err, const string &s, const C &list)
istream &	operator>> (istream &i, array< float, 2 > &f)
array< float, 2 >	Arr (const Vector< 2 > &vec)
Matrix< 3 >	invert (const Matrix< 3 > &m)
void	draw_offset_list (const vector< ImageRef > &offsets)
void	draw_offsets ()
CVD::ImageRef	ir_rounded (const tag::array< float, 2 > &v)

---

Define Documentation

#define fatal	(	E,
		S,
		...		)	vfatal((E), (S), (tag::Fmt,## __VA_ARGS__))

Print an error message and the exit.

Parameters:

	E	Error code
	S	Format string

Definition at line 125 of file learn_fast_tree.cc.

Referenced by find_best_split(), load_features(), main(), and datapoint< FEATURE_SIZE >::pack_trits().

---

Function Documentation

vector<string> split

(

const string &

s

)

Tokenise a string.

Parameters:

s

String to be split

Returns:

Tokens

Definition at line 249 of file faster_tree.cc.

Referenced by load_a_tree().

{
    istringstream i(s);

    vector<string> v;

    while(!i.eof())
    {
        string s;
        i >> s;
        if(s != "")
            v.push_back(s);
    }
    return v;
}

template<class C>

C ato

(

const string &

s

)

[inline]

String to some class.

Name modelled on atoi.

Parameters:

s

String to parse

Returns:

class the string was parsed in to.

Definition at line 269 of file faster_tree.cc.

{
    istringstream i(s);
    C c;
    i >> c;

    if(i.bad())
        throw   ParseError();
    
    return c;
}

double sq

(

double

d

)

Square a number.

Parameters:

d

Number to square

Returns:

$d^2$

Definition at line 100 of file learn_detector.cc.

Referenced by learn_detector().

{
    return d*d;
}

vector<int> range

(

int

num

)

Populate a std::vector with the numbers 0,1,.

..,num

Parameters:

num

Size if the range

Returns:

the populated vector.

Definition at line 110 of file learn_detector.cc.

{
    vector<int> r;

    for(int i=0; i < num; i++)
        r.push_back(i);
    return r;
}

template<class C>

void vfatal	(	int	err,
		const string &	s,
		const C &	list
	)			[inline]

Print an error message and the exit, using Tuple stype VARARGS.

Parameters:

	err	Error code
	s	Format string
	list	Argument list

Definition at line 131 of file learn_fast_tree.cc.

{
    vfPrintf(cerr, s + "\n", list);
    exit(err);
}

istream& operator>>	(	istream &	i,
		array< float, 2 > &	f
	)

Load an array from an istream.

Parameters:

	i	Stream to load from
	f	array to load in to

Definition at line 88 of file load_data.cc.

{
    i >> f[0] >> f[1];
    return i;
}

array<float, 2> Arr

(

const Vector< 2 > &

vec

)

Convert a vector in to an array.

Parameters:

vec

Vector to convert

Definition at line 97 of file load_data.cc.

Referenced by load_warps_vgg().

{
    return array<float, 2>((TupleHead, vec[0], vec[1]));
}

Matrix<3> invert

(

const Matrix< 3 > &

m

)

Invert a matrix.

Parameters:

m

Matrix to invert

Definition at line 223 of file load_data.cc.

Referenced by tree_element::detect_corner(), load_warps_vgg(), and tree_element::make_fast_detector().

{
    LU<3> i(m);
    return i.get_inverse();
}

void draw_offset_list

(

const vector< ImageRef > &

offsets

)

Pretty print some offsets to stdout.

Parameters:

offsets

List of offsets to pretty-print.

Definition at line 91 of file offsets.cc.

Referenced by draw_offsets().

{

    cout << "Allowed offsets: " << offsets.size() << endl;

    ImageRef min, max;
    min.x = *min_element(member_iterator(offsets.begin(), &ImageRef::x), member_iterator(offsets.end(), &ImageRef::x));
    max.x = *max_element(member_iterator(offsets.begin(), &ImageRef::x), member_iterator(offsets.end(), &ImageRef::x));
    min.y = *min_element(member_iterator(offsets.begin(), &ImageRef::y), member_iterator(offsets.end(), &ImageRef::y));
    max.y = *max_element(member_iterator(offsets.begin(), &ImageRef::y), member_iterator(offsets.end(), &ImageRef::y));

    cout << print << min <<max << endl;

    Image<int> o(max-min+ImageRef(1,1), -1);
    for(unsigned int i=0; i <offsets.size(); i++)
        o[offsets[i] -min] = i;

    for(int y=0; y < o.size().y; y++)
    {
        for(int x=0; x < o.size().x; x++)
            cout << "+------";
        cout << "+"<< endl;

        for(int x=0; x < o.size().x; x++)
            cout << "|      ";
        cout << "|"<< endl;


        for(int x=0; x < o.size().x; x++)
        {
            if(o[y][x] >= 0)
                cout << "|  " << setw(2) << o[y][x] << "  ";
            else if(ImageRef(x, y) == o.size() / 2)
                cout << "|   " << "#" << "  ";
            else 
                cout << "|      ";
        }
        cout <<  "|" << endl;

        for(int x=0; x < o.size().x; x++)
            cout << "|      ";
        cout << "|"<< endl;
    }

    for(int x=0; x < o.size().x; x++)
        cout << "+------";
    cout << "+"<< endl;

    cout << endl;

}

void draw_offsets

(

)

Prettyprints the contents of offsets.

Definition at line 201 of file offsets.cc.

Referenced by run_learn_detector().

{
    //Print the offsets out.    
    for(unsigned int i=0; i < 8; i++)
    {
        cout << "Offsets " << i << endl;
        draw_offset_list(offsets[i]);   
        cout << endl;
    }
}

CVD::ImageRef ir_rounded

(

const tag::array< float, 2 > &

v

)

[inline]

Convert a float array into an image co-ordinate.

Numbers are rounded

Parameters:

v

The array to convert

Definition at line 30 of file utility.h.

Referenced by compute_repeatability(), prune_warps(), and transform_offsets().

{
    return CVD::ImageRef(
  static_cast<int>(v[0] > 0.0 ? v[0] + 0.5 : v[0] - 0.5),
  static_cast<int>(v[1] > 0.0 ? v[1] + 0.5 : v[1] - 0.5));
}

---