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/*
* 1394-Based Digital Camera Control Library
*
* Color conversion functions, including Bayer pattern decoding
*
* Written by Damien Douxchamps and Frederic Devernay
*
* 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 2.1 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <dc1394/log.h>
#ifndef __DC1394_CONVERSIONS_H__
#define __DC1394_CONVERSIONS_H__
/*! \file dc1394/conversions.h
\brief functions to convert video formats
\author Damien Douxchamps: coding
\author Frederic Devernay: coding
\author Peter Antoniac: documentation maintainer
More details soon
*/
#define restrict __restrict
/**
* A list of de-mosaicing techniques for Bayer-patterns.
*
* The speed of the techniques can vary greatly, as well as their quality.
*/
typedef enum {
DC1394_BAYER_METHOD_NEAREST=0,
DC1394_BAYER_METHOD_SIMPLE,
DC1394_BAYER_METHOD_BILINEAR,
DC1394_BAYER_METHOD_HQLINEAR,
DC1394_BAYER_METHOD_DOWNSAMPLE,
DC1394_BAYER_METHOD_EDGESENSE,
DC1394_BAYER_METHOD_VNG,
DC1394_BAYER_METHOD_AHD
} dc1394bayer_method_t;
#define DC1394_BAYER_METHOD_MIN DC1394_BAYER_METHOD_NEAREST
#define DC1394_BAYER_METHOD_MAX DC1394_BAYER_METHOD_AHD
#define DC1394_BAYER_METHOD_NUM (DC1394_BAYER_METHOD_MAX-DC1394_BAYER_METHOD_MIN+1)
/**
* A list of known stereo-in-normal-video modes used by manufacturers like Point Grey Research and Videre Design.
*/
typedef enum {
DC1394_STEREO_METHOD_INTERLACED=0,
DC1394_STEREO_METHOD_FIELD
} dc1394stereo_method_t;
#define DC1394_STEREO_METHOD_MIN DC1394_STEREO_METHOD_INTERLACED
#define DC1394_STEREO_METHOD_MAX DC1394_STEREO_METHOD_FIELD
#define DC1394_STEREO_METHOD_NUM (DC1394_STEREO_METHOD_MAX-DC1394_STEREO_METHOD_MIN+1)
// color conversion functions from Bart Nabbe.
// corrected by Damien: bad coeficients in YUV2RGB
#define YUV2RGB(y, u, v, r, g, b) {\
r = y + ((v*1436) >> 10);\
g = y - ((u*352 + v*731) >> 10);\
b = y + ((u*1814) >> 10);\
r = r < 0 ? 0 : r;\
g = g < 0 ? 0 : g;\
b = b < 0 ? 0 : b;\
r = r > 255 ? 255 : r;\
g = g > 255 ? 255 : g;\
b = b > 255 ? 255 : b; }
#define RGB2YUV(r, g, b, y, u, v) {\
y = (306*r + 601*g + 117*b) >> 10;\
u = ((-172*r - 340*g + 512*b) >> 10) + 128;\
v = ((512*r - 429*g - 83*b) >> 10) + 128;\
y = y < 0 ? 0 : y;\
u = u < 0 ? 0 : u;\
v = v < 0 ? 0 : v;\
y = y > 255 ? 255 : y;\
u = u > 255 ? 255 : u;\
v = v > 255 ? 255 : v; }
#ifdef __cplusplus
extern "C" {
#endif
/**********************************************************************
* CONVERSION FUNCTIONS TO YUV422, MONO8 and RGB8
**********************************************************************/
/**
* Converts an image buffer to YUV422
*/
dc1394error_t
dc1394_convert_to_YUV422(uint8_t *src, uint8_t *dest, uint32_t width, uint32_t height, uint32_t byte_order,
dc1394color_coding_t source_coding, uint32_t bits);
/**
* Converts an image buffer to MONO8
*/
dc1394error_t
dc1394_convert_to_MONO8(uint8_t *src, uint8_t *dest, uint32_t width, uint32_t height, uint32_t byte_order,
dc1394color_coding_t source_coding, uint32_t bits);
/**
* Converts an image buffer to RGB8
*/
dc1394error_t
dc1394_convert_to_RGB8(uint8_t *src, uint8_t *dest, uint32_t width, uint32_t height, uint32_t byte_order,
dc1394color_coding_t source_coding, uint32_t bits);
/**********************************************************************
* CONVERSION FUNCTIONS FOR STEREO IMAGES
**********************************************************************/
/**
* changes a 16bit stereo image (8bit/channel) into two 8bit images on top of each other
*/
dc1394error_t
dc1394_deinterlace_stereo(uint8_t *src, uint8_t *dest, uint32_t width, uint32_t height);
/************************************************************************************************
* *
* Color conversion functions for cameras that can output raw Bayer pattern images (color *
* codings DC1394_COLOR_CODING_RAW8 and DC1394_COLOR_CODING_RAW16). *
* *
* Credits and sources: *
* - Nearest Neighbor : OpenCV library *
* - Bilinear : OpenCV library *
* - HQLinear : High-Quality Linear Interpolation For Demosaicing Of Bayer-Patterned *
* Color Images, by Henrique S. Malvar, Li-wei He, and Ross Cutler, *
* in Proceedings of the ICASSP'04 Conference. *
* - Edge Sense II : Laroche, Claude A. "Apparatus and method for adaptively interpolating *
* a full color image utilizing chrominance gradients" *
* U.S. Patent 5,373,322. Based on the code found on the website *
* http://www-ise.stanford.edu/~tingchen/ Converted to C and adapted to *
* all four elementary patterns. *
* - Downsample : "Known to the Ancients" *
* - Simple : Implemented from the information found in the manual of Allied Vision *
* Technologies (AVT) cameras. *
* - VNG : Variable Number of Gradients, a method described in *
* http://www-ise.stanford.edu/~tingchen/algodep/vargra.html *
* Sources import from DCRAW by Frederic Devernay. DCRAW is a RAW *
* converter program by Dave Coffin. URL: *
* http://www.cybercom.net/~dcoffin/dcraw/ *
* - AHD : Adaptive Homogeneity-Directed Demosaicing Algorithm, by K. Hirakawa *
* and T.W. Parks, IEEE Transactions on Image Processing, Vol. 14, Nr. 3, *
* March 2005, pp. 360 - 369. *
* *
************************************************************************************************/
/**
* Perform de-mosaicing on an 8-bit image buffer
*/
dc1394error_t
dc1394_bayer_decoding_8bit(const uint8_t *bayer, uint8_t *rgb,
uint32_t width, uint32_t height, dc1394color_filter_t tile,
dc1394bayer_method_t method);
/**
* Perform de-mosaicing on an 16-bit image buffer
*/
dc1394error_t
dc1394_bayer_decoding_16bit(const uint16_t *bayer, uint16_t *rgb,
uint32_t width, uint32_t height, dc1394color_filter_t tile,
dc1394bayer_method_t method, uint32_t bits);
/**********************************************************************************
* Frame based conversions
**********************************************************************************/
/**
* Converts the format of a video frame.
*
* To set the format of the output, simply set the values of the corresponding fields in the output frame
*/
dc1394error_t
dc1394_convert_frames(dc1394video_frame_t *in, dc1394video_frame_t *out);
/**
* De-mosaicing of a Bayer-encoded video frame
*
* To set the format of the output, simply set the values of the corresponding fields in the output frame
* @param in is a pointer to the bayer video frame that is to be converted
* @param out is a pointer to the frame to be converted to. If there is memory allocated to the image field,
* then it will be adjusted accordingly by this function. If there is no memory allocated to the image
* field, then ensure that out->image == NULL and out->allocated_image_bytes == 0
* @param method is the bayer method to interpolate the frame.
*/
dc1394error_t
dc1394_debayer_frames(dc1394video_frame_t *in, dc1394video_frame_t *out, dc1394bayer_method_t method);
/**
* De-interlacing of stereo data for cideo frames
*
* To set the format of the output, simply set the values of the corresponding fields in the output frame
*/
dc1394error_t
dc1394_deinterlace_stereo_frames(dc1394video_frame_t *in, dc1394video_frame_t *out, dc1394stereo_method_t method);
#ifdef __cplusplus
}
#endif
#endif /* _DC1394_CONVERSIONS_H */