bayer.c File Reference

Bayer array conversion routines. More...

#include "config.h"
#include "bayer.h"
#include <gphoto2/gphoto2-result.h>

Include dependency graph for bayer.c:

Macros
#define	RED   0
#define	GREEN   1
#define	BLUE   2
#define	AD(x, y, w)   ((y)*(w)*3+3*(x))

Functions
int	gp_bayer_expand (unsigned char *input, int w, int h, unsigned char *output, BayerTile tile)
	Expand a bayer raster style image to a RGB raster. More...
int	gp_bayer_interpolate (unsigned char *image, int w, int h, BayerTile tile)
	Interpolate a expanded bayer array into an RGB image. More...
int	gp_bayer_decode (unsigned char *input, int w, int h, unsigned char *output, BayerTile tile)
	Convert a bayer raster style image to a RGB raster. More...

Detailed Description

Bayer array conversion routines.

Author

Copyright 2001 Lutz Mueller lutz@.nosp@m.user.nosp@m.s.sf..nosp@m.net

Copyright 2007 Theodore Kilgore kilgo.nosp@m.ta@a.nosp@m.uburn.nosp@m..edu

gp_bayer_accrue() from Theodore Kilgore kilgo.nosp@m.ta@a.nosp@m.uburn.nosp@m..edu contains suggestions by B. R. Harris (e-mail address disappeared) and Werner Eugster eugst.nosp@m.er@g.nosp@m.iub.u.nosp@m.nibe.nosp@m..ch

License

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Function Documentation

int gp_bayer_decode	(	unsigned char *	input,
		int	w,
		int	h,
		unsigned char *	output,
		BayerTile	tile
	)

Convert a bayer raster style image to a RGB raster.

Parameters

input	the bayer CCD array as linear input
w	width of the above array
h	height of the above array
output	RGB output array (linear, 3 bytes of R,G,B for every pixel)
tile	how the 2x2 bayer array is layed out

A regular CCD uses a raster of 2 green, 1 blue and 1 red components to cover a 2x2 pixel area. The camera or the driver then interpolates a 2x2 RGB pixel set out of this data.

This function expands and interpolates the bayer array to 3 times larger bitmap with RGB values interpolated.

Returns

a gphoto error code

References gp_bayer_expand(), gp_bayer_interpolate(), and GP_OK.

int gp_bayer_expand	(	unsigned char *	input,
		int	w,
		int	h,
		unsigned char *	output,
		BayerTile	tile
	)

Expand a bayer raster style image to a RGB raster.

Parameters

input	the bayer CCD array as linear input
w	width of the above array
h	height of the above array
output	RGB output array (linear, 3 bytes of R,G,B for every pixel)
tile	how the 2x2 bayer array is layed out

A regular CCD uses a raster of 2 green, 1 blue and 1 red components to cover a 2x2 pixel area. The camera or the driver then interpolates a 2x2 RGB pixel set out of this data.

This function expands the bayer array to 3 times larger bitmap with RGB values copied as-is. Pixels were no sensor was there are 0. The data is supposed to be processed further by for instance gp_bayer_interpolate().

Returns

a gphoto error code

References BAYER_TILE_BGGR, BAYER_TILE_BGGR_INTERLACED, BAYER_TILE_GBRG, BAYER_TILE_GBRG_INTERLACED, BAYER_TILE_GRBG, BAYER_TILE_GRBG_INTERLACED, BAYER_TILE_RGGB, BAYER_TILE_RGGB_INTERLACED, and GP_OK.

Referenced by gp_ahd_decode(), and gp_bayer_decode().

int gp_bayer_interpolate	(	unsigned char *	image,
		int	w,
		int	h,
		BayerTile	tile
	)

Interpolate a expanded bayer array into an RGB image.

Parameters

image	the linear RGB array as both input and output
w	width of the above array
h	height of the above array
tile	how the 2x2 bayer array is layed out

This function interpolates a bayer array which has been pre-expanded by gp_bayer_expand() to an RGB image. It uses various interpolation methods, also see gp_bayer_accrue().

Returns

a gphoto error code

References BAYER_TILE_BGGR, BAYER_TILE_BGGR_INTERLACED, BAYER_TILE_GBRG, BAYER_TILE_GBRG_INTERLACED, BAYER_TILE_GRBG, BAYER_TILE_GRBG_INTERLACED, BAYER_TILE_RGGB, BAYER_TILE_RGGB_INTERLACED, and GP_OK.

Referenced by gp_bayer_decode().