imblur.c File Reference

Image blurring command line program. More...

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <fftw3.h>
#include "cliio.h"
#include "kernels.h"
#include "randmt.h"

Go to the source code of this file.

Data Structures
struct	programparams
	Program parameters struct. More...

Macros
#define	MIN(a, b)   (((a) <= (b)) ? (a) : (b))
#define	_CONCAT(A, B)   A ## B
#define	FFT(S)   _CONCAT(fftw_,S)

Typedefs
typedef num	numcomplex [2]
	Complex value type.

Enumerations
enum	noisetype { NOISE_GAUSSIAN, NOISE_LAPLACE, NOISE_POISSON }

Functions
static void	PrintHelpMessage ()
	Print program information and usage message.
int	ParseParams (programparams *Params, int argc, const char *argv[])
	Parse command line arguments.
static num	WSymExtension (const num *Data, int Width, int Height, int x, int y)
	Boundary handling function for whole-sample symmetric extension. More...
numcomplex *	ComputePaddedDFT (num *PadTemp, int PadWidth, int PadHeight, const num *Src, int SrcWidth, int SrcHeight, int IsKernelFlag)
	Pad an image and compute Fourier transform. More...
int	ComputePaddedIDFT (num *Dest, int DestWidth, int DestHeight, num *PadTemp, int PadWidth, int PadHeight, numcomplex *Src)
	Invert Fourier transform and trim padding. More...
int	BlurImage (num *Image, int ImageWidth, int ImageHeight, int NumChannels, const num *Kernel, int KernelWidth, int KernelHeight)
	Convolve an image with a kernel. More...
void	GenerateNoise (num *Data, long NumEl, noisetype NoiseType, num Sigma)
	Simulate noise of a specified type and standard deviation. More...
int	main (int argc, char **argv)
static int	ReadNoise (programparams *Params, const char *String)
	Parse noise command line argument.

Detailed Description

Image blurring command line program.

Author

Pascal Getreuer getre.nosp@m.uer@.nosp@m.gmail.nosp@m..com

Copyright (c) 2010-2012, 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 with this program. If not, see http://www.opensource.org/licenses/bsd-license.html.

Definition in file imblur.c.

Function Documentation

int BlurImage	(	num *	Image,
		int	ImageWidth,
		int	ImageHeight,
		int	NumChannels,
		const num *	Kernel,
		int	KernelWidth,
		int	KernelHeight
	)

Convolve an image with a kernel.

Parameters

Image	the image data in row-major planar order
ImageWidth,ImageHeight,NumChannels	the image dimensions
Kernel	the convolution kernel
KernelWidth,KernelHeight	the kernel dimensions

Returns

1 on success, 0 on failure

Definition at line 235 of file imblur.c.

numcomplex* ComputePaddedDFT	(	num *	PadTemp,
		int	PadWidth,
		int	PadHeight,
		const num *	Src,
		int	SrcWidth,
		int	SrcHeight,
		int	IsKernelFlag
	)

Pad an image and compute Fourier transform.

Parameters

PadTemp	temporary buffer
PadWidth,PadHeight	dimensions of the padded image
Src	the source image
SrcWidth,SrcHeight	dimensions of Src
IsKernelFlag	nonzero if Src is a convolution kernel

Returns

the Fourier transform of the padded image, or NULL on failure

Definition at line 132 of file imblur.c.

int ComputePaddedIDFT	(	num *	Dest,
		int	DestWidth,
		int	DestHeight,
		num *	PadTemp,
		int	PadWidth,
		int	PadHeight,
		numcomplex *	Src
	)

Invert Fourier transform and trim padding.

Parameters

Dest	destination buffer
DestWidth,DestHeight	dimensions of Dest
PadTemp	temporary buffer
PadWidth,PadHeight	dimensions of the padded image
Src	the transformed image

Returns

1 on succes, 0 on failure

Definition at line 198 of file imblur.c.

void GenerateNoise	(	num *	Data,
		long	NumEl,
		noisetype	NoiseType,
		num	Sigma
	)

Simulate noise of a specified type and standard deviation.

Parameters

Data	the image data upon which noise is simulated
NumEl	number of elements in Data
NoiseType	type of noise (Gaussian, Laplace, or Poisson)
Sigma	standard deviation of the noise

Definition at line 325 of file imblur.c.

static num WSymExtension ( const num *  Data, int  Width, int  Height, int  x, int  y  )

static

Boundary handling function for whole-sample symmetric extension.

Parameters

Data	pointer to a contiguous 2D array in row-major order
Width,Height	size of the data
x,y	sampling location

Returns

extrapolated value

Definition at line 96 of file imblur.c.