mirror of
https://github.com/opencv/opencv.git
synced 2024-11-30 06:10:02 +08:00
121 lines
4.0 KiB
C++
121 lines
4.0 KiB
C++
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Copyright (c) 2003, Industrial Light & Magic, a division of Lucas
|
|
// Digital Ltd. LLC
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Industrial Light & Magic nor the names of
|
|
// its contributors may be used to endorse or promote products derived
|
|
// from this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
#ifndef INCLUDED_IMF_CHROMATICITIES_H
|
|
#define INCLUDED_IMF_CHROMATICITIES_H
|
|
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// CIE (x,y) chromaticities, and conversions between
|
|
// RGB tiples and CIE XYZ tristimulus values.
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#include "ImathVec.h"
|
|
#include "ImathMatrix.h"
|
|
|
|
namespace Imf {
|
|
|
|
|
|
struct Chromaticities
|
|
{
|
|
//-----------------------------------------------
|
|
// The CIE x and y coordinates of the RGB triples
|
|
// (1,0,0), (0,1,0), (0,0,1) and (1,1,1).
|
|
//-----------------------------------------------
|
|
|
|
Imath::V2f red;
|
|
Imath::V2f green;
|
|
Imath::V2f blue;
|
|
Imath::V2f white;
|
|
|
|
//--------------------------------------------
|
|
// Default constructor produces chromaticities
|
|
// according to Rec. ITU-R BT.709-3
|
|
//--------------------------------------------
|
|
|
|
Chromaticities (const Imath::V2f &red = Imath::V2f (0.6400f, 0.3300f),
|
|
const Imath::V2f &green = Imath::V2f (0.3000f, 0.6000f),
|
|
const Imath::V2f &blue = Imath::V2f (0.1500f, 0.0600f),
|
|
const Imath::V2f &white = Imath::V2f (0.3127f, 0.3290f));
|
|
};
|
|
|
|
|
|
//
|
|
// Conversions between RGB and CIE XYZ
|
|
//
|
|
// RGB to XYZ:
|
|
//
|
|
// Given a set of chromaticities, c, and the luminance, Y, of the RGB
|
|
// triple (1,1,1), or "white", RGBtoXYZ(c,Y) computes a matrix, M, so
|
|
// that multiplying an RGB value, v, with M produces an equivalent
|
|
// XYZ value, w. (w == v * M)
|
|
//
|
|
// If we define that
|
|
//
|
|
// (Xr, Yr, Zr) == (1, 0, 0) * M
|
|
// (Xg, Yg, Zg) == (0, 1, 0) * M
|
|
// (Xb, Yb, Zb) == (0, 0, 1) * M
|
|
// (Xw, Yw, Zw) == (1, 1, 1) * M,
|
|
//
|
|
// then the following statements are true:
|
|
//
|
|
// Xr / (Xr + Yr + Zr) == c.red.x
|
|
// Yr / (Xr + Yr + Zr) == c.red.y
|
|
//
|
|
// Xg / (Xg + Yg + Zg) == c.red.x
|
|
// Yg / (Xg + Yg + Zg) == c.red.y
|
|
//
|
|
// Xb / (Xb + Yb + Zb) == c.red.x
|
|
// Yb / (Xb + Yb + Zb) == c.red.y
|
|
//
|
|
// Xw / (Xw + Yw + Zw) == c.red.x
|
|
// Yw / (Xw + Yw + Zw) == c.red.y
|
|
//
|
|
// Yw == Y.
|
|
//
|
|
// XYZ to RGB:
|
|
//
|
|
// YYZtoRGB(c,Y) returns RGBtoXYZ(c,Y).inverse().
|
|
//
|
|
|
|
Imath::M44f RGBtoXYZ (const Chromaticities chroma, float Y);
|
|
Imath::M44f XYZtoRGB (const Chromaticities chroma, float Y);
|
|
|
|
|
|
} // namespace Imf
|
|
|
|
#endif
|