LocalMinmaxOptions Class Reference

Options object for localMinima() and localMaxima(). More...

#include <vigra/localminmax.hxx>

Public Member Functions
LocalMinmaxOptions &	allowAtBorder (bool f=true)
	Detect extrema at the image border. More...
LocalMinmaxOptions &	allowPlateaus (bool f=true)
	Allow extremal plateaus. More...
	LocalMinmaxOptions ()
	Construct default options object. More...
LocalMinmaxOptions &	markWith (double m)
	Mark extrema in the destination image with the given value. More...
LocalMinmaxOptions &	neighborhood (unsigned int n)
	Use the given neighborhood. More...
LocalMinmaxOptions &	threshold (double t)
	Threshold the extrema. More...

Detailed Description

Options object for localMinima() and localMaxima().

Usage:

#include <vigra/localminmax.hxx>
Namespace: vigra

MultiArray<2, unsigned char> src(w,h), minima(w,h);
... // fill src

// use 4-neighborhood, allow minima at the image border, 
// and discard those where the gray value is not below 5
localMinima(src, minima,
            LocalMinmaxOptions().neighborhood(4).allowAtBorder().threshold(5));

Constructor & Destructor Documentation

LocalMinmaxOptions

(

)

Construct default options object.

Defaults are: marker value '1', no threshold, indirect neighborhood, don't allow extrema at border and extremal plateaus.

Member Function Documentation

LocalMinmaxOptions& neighborhood

(

unsigned int

n

)

Use the given neighborhood.

The value '0' indicates direct neighborhood (i.e. 4-neighborhood in 2D, 6-neighborhood in 3D, 2*N neighborhood in N-D), the value '1' indicates indirect neighborhood (i.e. 8-neighborhood in 2D, 26-neighborhood in 3D, 3^N-1 neighborhood in N-D). The appropriate number of neighbors for the desired dimension and the constants DirectNeighborhood and IndirectNeighborhood can be used as well.

Default: 1 (indirect neighborhood)

LocalMinmaxOptions& markWith

(

double

m

)

Mark extrema in the destination image with the given value.

Default: 1

LocalMinmaxOptions& threshold

(

double

t

)

Threshold the extrema.

Discard minima whose gray value is not below the threshold. and maxima whose gray level is not above the threshold.

Default: don't threshold (i.e. return all extrema)

LocalMinmaxOptions& allowAtBorder

(

bool

f = true

)

Detect extrema at the image border.

Default: false

LocalMinmaxOptions& allowPlateaus

(

bool

f = true

)

Allow extremal plateaus.

That is regions of constant gray value whose neighbors are all higher (minima) or lower than the value of the region.

Default: false

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The documentation for this class was generated from the following file:

• vigra/localminmax.hxx