lkernels.c File Reference

Interpolation kernel and basis functions for linear interpolation. More...

#include <math.h>
#include <string.h>
#include "lkernels.h"

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Defines
#define	M_PI   3.14159265358979323846264338327950288
	The constant pi.
#define	NUMEL(x)   (sizeof(x)/sizeof(*(x)))
	Macro to get the number of elements in a static array.
Functions
float	NearestNeighborKernel (float x)
	Bilinear interpolation kernel (KernelRadius = 0.5)
interpmethod *	GetInterpMethod (const char *Name)
	Get the interpmethod struct for an interpolation method by name.

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Detailed Description

Interpolation kernel and basis functions for linear interpolation.

Author:

Pascal Getreuer <getreuer@gmail.com>

Copyright (c) 2010-2011, Pascal Getreuer All rights reserved.

This program is free software: you can use, modify and/or redistribute it under the terms of the simplified BSD License. You should have received a copy of this license along this program. If not, see <http://www.opensource.org/licenses/bsd-license.html>.

Definition in file lkernels.c.

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Define Documentation

#define M_PI   3.14159265358979323846264338327950288

The constant pi.

Definition at line 22 of file lkernels.c.

#define NUMEL

(

x

)

(sizeof(x)/sizeof(*(x)))

Macro to get the number of elements in a static array.

Definition at line 26 of file lkernels.c.

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Function Documentation

interpmethod* GetInterpMethod

(

const char *

Name

)

Get the interpmethod struct for an interpolation method by name.

Parameters:

Name	name of the interpolation method

Returns:

pointer to interpmethod struct on success, null pointer on failure.

Choices are

• "nearest"
• "bilinear"
• "bicubic"
• "lanczosN" with N = 2, 3, or 4
• "schaumN" with N = 2 or 3
• "bsplineN" with N = 2, 3, 5, 7, 9, or 11
• "omomsN" with N = 3, 5 or 7

Definition at line 492 of file lkernels.c.

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float NearestNeighborKernel

(

float

x

)

Bilinear interpolation kernel (KernelRadius = 0.5)

Parameters:

x	coordinate at which to evaluate the kernel

Returns:

the kernel value at x

Definition at line 34 of file lkernels.c.