EdgeC - Elementary boundary edge

User Documentation

RAVL, Recognition And Vision Library

Ravl - Math - Geometry - 2D - Boundry - EdgeC

EdgeC

Elementary boundary edge

include	"Ravl/Edge.hh"
Created:	26.10.1995
User Level:	Normal
Library:	RavlMath
In Scope:	RavlN

Comments:
The class EdgeC represent an elementary edge of discrete image. Elementary edge is located between two pixels. Edge is represented by its origin and its direction. This definition implies only 4 possible directions represented by Freeman code. Four elementary edges around a pixel are oriented counter-clockwise according to the center of the pixel. For example, the top edge has the direction to the left and its origin is upper-right corner of the pixel.

Parent Classes:

BVertexC

CrackCodeC

Methods:

Constructors, copies, assigment, and destructor.

EdgeC(): Creates an edge
The value is undefined.
EdgeC(const BVertexC & px,const CrackCodeC & cc): Create the edge with origin in the boundary vertex 'px' and with direction 'cc'.
EdgeC(const BVertexC & begin,const BVertexC & end): Create the edge with origin in the boundary vertex 'begin' pointing towards the boudary vertex 'end'. The direction is automatically generated.
EdgeC(const Index2dC & pxl,const CrackCodeC & cc): Creates the edge which starts at one corner of the pixel 'pxl' and has the direction 'cc'. The corner of the pixel is chosen in such way that the elementary edge is an elementary edge of the pixel.

Logical operators.

bool operator ==(const EdgeC & edg) const: Returns true if both edge are equivalent.
bool operator !=(const EdgeC & edg) const: Returns true if edges are different.

Access to elements of an elementary edge.

Index2dC RPixel() const: Returns the pixel on the right side of the edge.
Index2dC LPixel() const: Returns the pixel on the left side of the edge.
const BVertexC & Begin() const: Returns the boundary vertex from which the elementary edge starts from.
BVertexC & Begin(): Returns the boundary vertex from which the elementary edge starts from.
BVertexC End() const: Returns the boundary vertex to which the elementary edge points to.
const EdgeC & Reverse(): Reverse the direction of this edge.

#include "Ravl/BVertex.hh"

const BVertexC & BVertex() const: Access to the constant object
BVertexC & BVertex(): Access to the object

#include "Ravl/CrackCode.hh"

CrackCodeT Code() const: Returns the crack code.
bool operator ==(const CrackCodeC & cc) const: Equality test
bool operator !=(const CrackCodeC & cc) const: Returns true if the object content is not equal to 'cc'.
const CrackCodeC & operator +=(const CrackCodeC & cc): The crackcode 'cc' is taken as a relative crackcode. The relative crackcode is added to this crackcode.
const CrackCodeC & operator -=(const CrackCodeC & cc): The crackcode 'cc' is taken as a relative crackcode. The relative crackcode is subtracted from this crackcode.
const CrackCodeC & operator =(const CrackCodeC & cc): Assignment.
const CrackCodeC & operator =(const CrackCodeT & cc): Assignment.
---------- turning -----------------------
CrackCodeC & TurnClock(): Turns the crackcode clockwise.
This is an inplace operation.
CrackCodeC & TurnCClock(): Turns the crackcode counterclockwise.
This is an inplace operation.
CrackCodeC & TurnBack(): Turns the crackcode backward.
This is an inplace operation.
Index2dC Next(const Index2dC & pixel) const: Get pixel in the direction of the crack code.

#include "Ravl/Index2d.hh"

explicit Index2dC(SizeT dim): Creates an index
This is for compatibilty with N-D indexes, which need to be told there dimentionality.

Object modification

void Set(IndexC r,IndexC c): Sets this index to be .
const Index2dC & Step(const NeighbourOrderT & dir): Translates index in direction 'dir'.
Index2dC Swapped() const: Returns the 2-dimensional index with swapped value I() and J().
Index2dC & Abs(): Changes both indexes to their absolute values.

Access to the member items

const IndexC & Row() const: Constant access to the row index
const IndexC & Col() const: Constant access to the column index
IndexC & Row(): Access to the row index
IndexC & Col(): Access to the column index

Logical conditions

bool IsInside(const IndexRange2dC & range) const: Returns true, if this index is in the 'range'.
bool IsMoreUpperLeft(const Index2dC & i) const: Returns true, if Row() < i.Row() or (Row() == i.Row() and Col() < i.Col()).
bool operator <(const Index2dC & i) const: A nick name for the member function IsMoreUpperLeft(i).

Operations on the neighbourhood

Index2dC & Right(): Shifts the index to the right.
Index2dC & Left(): Shifts the index to the left.
Index2dC & Up(): Shifts the index to the up.
Index2dC & Down(): Shifts the index to the down.
Index2dC RightN() const: Returns the index of the right neighbour.
Index2dC LeftN() const: Returns the index of the left neighbour.
Index2dC UpN() const: Returns the index of the upper neighbour.
Index2dC DownN() const: Returns the index of the down neighbour.
Index2dC LowerLeftN() const: Returns the coordinates of the downleft neighbouring pixel
Index2dC LowerRightN() const: Returns the coordinates of the downright neighbouring pixel
Index2dC UpperLeftN() const: Returns the coordinates of the upperleft neighbouring pixel
Index2dC UpperRightN() const: Returns the coordinates of the upperright neighbouring pixel
Index2dC Neighbour(NeighbourOrderT dir) const: Returns the index of the neighbour in the direction 'dir'.
bool IsRelNeighbour8() const: Is '*this' a relative index from 8-neighbourhood?
bool IsNeighbour8(const Index2dC & pxl) const: Is the 'pxl' a neighbouring index of '*this'?
IndexC NeighbourOrder() const: Returns the order of the relative index.
IndexC NeighbourOrder(const Index2dC & ind) const: Returns the order of the neighbouring index 'ind'.

Distance calculations

UIntT SumSqr() const: Returns the sum of coordinate squares.
UIntT Distance(const Index2dC & i,GridMetricT m) const: Returns the distance of two indexes in the specified metric 'm'.

Special member functions

IntT Area2(const Index2dC & second,const Index2dC & third) const: Returns twice the signed area of the triangle determined by this, the second, and the third points. Positive if 'this', 'second', 'third' are oriented counter-clockwise, and negative if clockwise.
Ref.: - O'Rourke,J.: Computatinal geometry in C; Cambridge University Press, 1994, pp. 19-20

#include "Ravl/FIndex.hh"

UIntT Hash(void) const: Generates a randomised hash value for this index.

Arithmetic operations

const FIndexC<2> & operator *=(IntT alpha): Multiplies this index by number 'alpha'.
const FIndexC<2> & operator *=(RealT alpha): Multiplies this index by real number 'alpha'.
const FIndexC<2> & operator /=(IntT alpha): Divides this index by number 'alpha'.
const FIndexC<2> & operator /=(RealT alpha): Divides this index by real number 'alpha'.
FIndexC<2> operator *(IntT alpha) const: Multiplies this index by number 'alpha'.
FIndexC<2> operator *(RealT alpha) const: Multiplies this index by real number 'alpha'.
FIndexC<2> operator /(IntT alpha) const: Divides this index by number 'alpha'.
FIndexC<2> operator /(RealT alpha) const: Divides this index by real number 'alpha'.

#include "Ravl/TFVector.hh"

UIntT Size() const: Get size of array
Used by some templates.
bool Contains(UIntT i) const: Test if array contains index i�
IndexC & operator [](UIntT ind): Access item.
const IndexC & operator [](UIntT ind) const: Access item.
bool operator ==(const TFVectorC<IndexC,2> & ind) const: is equal
bool operator !=(const TFVectorC<IndexC,2> & ind) const: is not equal
void Fill(const IndexC & dat): Fill array with value 'dat'.
TFVectorC<IndexC,2> Abs() const: Get an vector with Abs(x) run on all it values.
const TFVectorC<IndexC,2> & operator +=(const TFVectorC<IndexC,2> & ind): Add an array to this one, inplace.
const TFVectorC<IndexC,2> & operator -=(const TFVectorC<IndexC,2> & ind): Returns this index multiplied by index 'ind' item by item.
const TFVectorC<IndexC,2> & operator *=(const TFVectorC<IndexC,2> & ind): Multiplies this index by index 'ind' item by item.
const TFVectorC<IndexC,2> & operator /=(const TFVectorC<IndexC,2> & ind): Divides this index by index 'ind' item by item.
TFVectorC<IndexC,2> operator +(const TFVectorC<IndexC,2> & ind) const: Adds this index and 'ind'.
TFVectorC<IndexC,2> operator -(const TFVectorC<IndexC,2> & ind) const: Subtracts index 'ind' from this index.
TFVectorC<IndexC,2> operator *(const TFVectorC<IndexC,2> & ind) const: Returns this object multiplied by index 'ind' item by item.
TFVectorC<IndexC,2> operator /(const TFVectorC<IndexC,2> & ind) const: Returns this object devided by index 'ind' item by item.
TFVectorC<IndexC,2> operator -() const: Returns opposite elements (unary minus operator).
const TFVectorC<IndexC,2> & operator *=(const IndexC & alpha): Multiplies this index by number 'alpha'.
const TFVectorC<IndexC,2> & operator /=(const IndexC & alpha): Divides this index by number 'alpha'.
TFVectorC<IndexC,2> operator *(const IndexC & alpha) const: Returns this object mutliplied by alpha.
TFVectorC<IndexC,2> operator /(const IndexC & alpha) const: Returns this object devided by alpha.
IndexC Dot(const TFVectorC<IndexC,2> & oth) const: Calculate the dot product of this and 'oth' vector.
TFMatrixC<IndexC,2,2> & OuterProduct(const TFVectorC<IndexC,2> & av,TFMatrixC<IndexC,2,2> & result) const: Calculate the outer product of this vector with av.
The output is assigned to 'result'. A reference to 'result' is returned.
The implementation is in "Ravl/FMatrix.hh", it must be included to use this function.
TFMatrixC<IndexC,2,2> & OuterProduct(TFMatrixC<IndexC,2,2> & result) const: Calculate the outer product of this vector with itsself.
The output is assigned to 'result'. A reference to 'result' is returned.
The implementation is in "Ravl/FMatrix.hh", it must be included to use this function.
bool Limit(const IndexC & min,const IndexC & max): Limit all values in this vector to between min and max.
Returns true if all values in the vector are between the limits. Distance calculations ---------------------
IndexC MaxValueDistance(const TFVectorC<IndexC,2> & i) const: Returns the distance of two indexes in maximum value metric.
IndexC CityBlockDistance(const TFVectorC<IndexC,2> & i) const: Returns the distance of two indexes in absolute value metric.
IndexC SqrEuclidDistance(const TFVectorC<IndexC,2> & i) const: Returns the distance of two indexes in square Euclid metric.
IndexC Sum() const: Calculate the sum of all the vector elements.
IndexC SumSqr() const: Calculate the sum of the squares of all the vector elements.
const TFMatrixC<IndexC,1,2> & T() const: Transpose vector.
The implementation for this can be found in "Ravl/TFMatrix.hh"
istream & operator >>(istream & in,TFVectorC<IndexC,2> & dat)
ostream & operator <<(ostream & in,const TFVectorC<IndexC,2> & dat)
BinIStreamC & operator >>(BinIStreamC & in,TFVectorC<IndexC,2> & dat)
BinOStreamC & operator <<(BinOStreamC & in,const TFVectorC<IndexC,2> & dat)

Maintainer:Radek Marik, Created: 26.10.1995, Documentation by CxxDoc: Tue Aug 13 09:59:02 2002