dmbilinear.c File Reference

Bilinear demosaicing. More...

#include "dmbilinear.h"

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Functions
void	CfaFlatten (float *Flat, const float *Input, int Width, int Height, int RedX, int RedY)
	Flatten a CFA-filtered image to a 2D array. More...
void	BilinearDifference (float *Output, const float *Diff, int Width, int Height, int RedX, int RedY)
	Bilinearly interpolate (Red - Green) and (Blue - Green) differences. More...
void	BilinearDemosaic (float *Output, const float *Input, int Width, int Height, int RedX, int RedY)
	Bilinear demosaicing. More...

Detailed Description

Bilinear demosaicing.

Author

Pascal Getreuer getre.nosp@m.uer@.nosp@m.gmail.nosp@m..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 dmbilinear.c.

Function Documentation

void BilinearDemosaic	(	float *	Output,
		const float *	Input,
		int	Width,
		int	Height,
		int	RedX,
		int	RedY
	)

Bilinear demosaicing.

Parameters

Output	pointer to memory to store the demosaiced image
Input	the input image as a flattened 2D array
Width,Height	the image dimensions
RedX,RedY	the coordinates of the upper-rightmost red pixel

Bilinear demosaicing is considered to be the simplest demosaicing method and is used as a baseline for comparing more sophisticated methods.

The Input image is a 2D float array of the input RGB values of size Width*Height in row-major order. RedX, RedY are the coordinates of the upper-rightmost red pixel to specify the CFA pattern.

Definition at line 212 of file dmbilinear.c.

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void BilinearDifference	(	float *	Output,
		const float *	Diff,
		int	Width,
		int	Height,
		int	RedX,
		int	RedY
	)

Bilinearly interpolate (Red - Green) and (Blue - Green) differences.

Parameters

Output	output image with the green channel already filled
Diff	2D array of (Red - Green) and (Blue - Green) differences
Width,Height	the image dimensions
RedX,RedY	the coordinates of the upper-rightmost red pixel

This routine interpolates (R-G) and (B-G) differences using an already filled green channel. Output should be a contiguous array in row-major planar order where the (second) green channel is filled. The red and blue channels will be filled with the interpolation result. The green channel is unchanged. Diff is a 2D array in row-major order where the values denote (R-G) values at red locations at (B-G) values at blue locations.

To interpolate (B-G) values at a red location, the (B-G) values of its four diagonal neighbors is averaged (the (B-G) values are known here because the the diagonal neighbors are all blue locations). (R-G) values are interpolated at blue locations similarly.

At a green location in a blue row, (B-G) is interpolated by averaging the (B-G) values of its horizontal neighbors, which are both blue locations. (R-G) is interpolated by averaging its vertical neighbors. Interpolation at a green location in a red row is similar.

Definition at line 74 of file dmbilinear.c.

void CfaFlatten	(	float *	Flat,
		const float *	Input,
		int	Width,
		int	Height,
		int	RedX,
		int	RedY
	)

Flatten a CFA-filtered image to a 2D array.

Parameters

Flat	the output 2D array of size Width by Height
Input	the input RGB image in row-major planar order
Width,Height	size of the image
RedX,RedY	the coordinates of the upper-rightmost red pixel

Definition at line 26 of file dmbilinear.c.

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