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Calculates 2D pair-wise geometrical histogram (PGH), described in [Iivarinen97], for the contour. The algorithm considers every pair of the contour edges. The angle between the edges and the minimum/maximum distances are determined for every pair. To do this each of the edges in turn is taken as the base, while the function loops through all the other edges. When the base edge and any other edge are considered, the minimum and maximum distances from the points on the non-base edge and line of the base edge are selected. The angle between the edges defines the row of the histogram in which all the bins that correspond to the distance between the calculated minimum and maximum distances are incremented (that is, the histogram is transposed relatively to [Iivarninen97] definition). The histogram can be used for contour matching

**Namespace:** Emgu.CV

**Assembly:** Emgu.CV (in Emgu.CV.dll) Version: 2.4.2.1777 (2.4.2.1777)

# Syntax

C# |
---|

public static void cvCalcPGH(
IntPtr contour,
IntPtr hist
) |

Visual Basic |
---|

Public Shared Sub cvCalcPGH ( _
contour As IntPtr, _
hist As IntPtr _
) |

Visual C++ |
---|

public:
static void cvCalcPGH(
IntPtr contour,
IntPtr hist
) |

#### Parameters

- contour
- Type: System..::..IntPtr

Input contour. Currently, only integer point coordinates are allowed

- hist
- Type: System..::..IntPtr

Calculated histogram; must be two-dimensional

# See Also