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details BilinearInterpolatingAccessor< ACCESSOR, VALUETYPE > Class Template Reference VIGRA

Bilinear interpolation at non-integer positions. More...

#include <vigra/interpolating_accessor.hxx>

List of all members.

Public Types

typedef VALUETYPE value_type

Public Member Functions

 BilinearInterpolatingAccessor (ACCESSOR a)
template<class ITERATOR >
value_type operator() (ITERATOR const &i, float x, float y) const
template<class ITERATOR >
value_type unchecked (ITERATOR const &i, float x, float y) const

Detailed Description

template<class ACCESSOR, class VALUETYPE>
class vigra::BilinearInterpolatingAccessor< ACCESSOR, VALUETYPE >

Bilinear interpolation at non-integer positions.

This accessor allows an image be accessed at arbitrary non-integer coordinates and performs an bi-linear interpolation to obtain a pixel value. It uses the given ACCESSOR (which is usually the accessor originally associated with the iterator) to access data.

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

Required Interface:

    ITERATOR iter;
    ACCESSOR a;
    VALUETYPE destvalue;
    float s;
    int x, y;

    destvalue = s * a(iter, x, y) + s * a(iter, x, y);

Member Typedef Documentation

typedef VALUETYPE value_type

the iterators' pixel type


Constructor & Destructor Documentation

init from given accessor


Member Function Documentation

value_type operator() ( ITERATOR const &  i,
float  x,
float  y 
) const

Interpolate the data item at a non-integer position. Ensure that no outside pixels are accessed if (x, y) is near the image border (as long as 0 <= x <= width-1, 0 <= y <= height-1).

value_type unchecked ( ITERATOR const &  i,
float  x,
float  y 
) const

Interpolate the data item at a non-integer position. This function works as long as 0 <= x < width-1, 0 <= y < height-1. It is slightly faster than operator().


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

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

html generated using doxygen and Python
vigra 1.9.0 (Tue Nov 6 2012)