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Computes the length of the input region perimeter.

Namespace: | AvlNet |
---|---|

Assembly: | AVL.NET.dll |

### Syntax

C++

C#

public static void RegionPerimeterLength ( AvlNet.Region inRegion, out float outPerimeterLength )

### Parameters

Name | Type | Range | Default | Description | |
---|---|---|---|---|---|

inRegion | AvlNet.Region | Input region. | |||

outPerimeterLength | float |

### Description

The operation computes the perimeter length of a region **shape**. Because regions are pixel-precise, the literal computation of the length of the region contour would lead to the overestimation of the diagonal edges. Therefore, the filter employs the following equation to approximate the result:

Where

**sides**denotes the number of pixel sides adjacent to the region background**vertices**is the number of turns to right during clockwise walk along the pixel sides of the region boundary**a**,**b**are constants defined as follows:

To compute the actual contour of the region, one can use RegionContours filter.