Separable Filtering

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These methods perform convolution of a separable filter and an Image using a given convolution boundary strategy.

See also:

Image Filtering

Enumerations
enum	nrt::ConvolutionBoundaryStrategy { nrt::ZERO, nrt::CLEAN, nrt::REPLICATE }
	Convolution boundary strategies. More...
Functions
template<NRT_MACRO_PROMOTE_PIX(double) >
Image< DestType > const	nrt::xFilter (Image< PixType > const src, Image< DestType > const hFilt, ConvolutionBoundaryStrategy const boundary)
	Convolve a horizontal 1-D filter with the input Image using the given boundary strategy.
template<NRT_MACRO_PROMOTE_PIX(double) >
Image< DestType > const	nrt::yFilter (Image< PixType > const src, Image< DestType > const vFilt, ConvolutionBoundaryStrategy const boundary)
	Convolve a vertical 1-D filter with the input Image using the given boundary strategy.
template<NRT_MACRO_PROMOTE_PIX(double) >
Image< DestType > const	nrt::separableFilter (Image< PixType > const src, Image< DestType > const hFilter, Image< DestType > const vFilter, ConvolutionBoundaryStrategy const boundary)
	Convolve horizontal and vertical separable filters with the input Image using the given boundary strategy.
template<NRT_MACRO_PROMOTE_PIX(double) >
Image< DestType > const	nrt::separableFilter (Image< PixType > const src, Image< DestType > const filter, ConvolutionBoundaryStrategy const boundary)
	Convolve a single separable filter (either 1xN or Nx1) with the input Image using the given boundary strategy.

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Enumeration Type Documentation

enum nrt::ConvolutionBoundaryStrategy

Convolution boundary strategies.

Enumerator:

ZERO	zero-pad, i.e., a black border is simulated around the source image
CLEAN	normalize by the sum of the used filter coefficients (see Itti and Koch, Vision Research, 2000)
REPLICATE	replicate the nearest image pixel value

Definition at line 58 of file SeparableFilter.H.

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Function Documentation

template<NRT_MACRO_PROMOTE_PIX(double) >

nrt::Image< DestType > const nrt::separableFilter	(	nrt::Image< PixType > const	src,
		nrt::Image< DestType > const	hFilter,
		nrt::Image< DestType > const	vFilter,
		nrt::ConvolutionBoundaryStrategy const	boundary
	)

Convolve horizontal and vertical separable filters with the input Image using the given boundary strategy.

Internally, this method just calls nrt::yFilter(nrt::xFilter(src, hFilter), vFilter)

Definition at line 483 of file SeparableFilterImpl.H.

References nrt::Image< T, Flags >::height(), and nrt::Image< T, Flags >::width().

Referenced by nrt::sobelFilter3(), and nrt::sobelFilter5().

template<NRT_MACRO_PROMOTE_PIX(double) >

nrt::Image< DestType > const nrt::separableFilter	(	nrt::Image< PixType > const	src,
		nrt::Image< DestType > const	filter,
		nrt::ConvolutionBoundaryStrategy const	boundary
	)

Convolve a single separable filter (either 1xN or Nx1) with the input Image using the given boundary strategy.

Internally, this method just calls yFilter() or xFilter(), depending on whether filter is a row or a column

Definition at line 497 of file SeparableFilterImpl.H.

References nrt::Image< T, Flags >::dims(), nrt::Image< T, Flags >::height(), NRT_FATAL, and nrt::Image< T, Flags >::width().