mirror of
https://github.com/opencv/opencv.git
synced 2024-12-26 10:48:12 +08:00
496 lines
13 KiB
C++
496 lines
13 KiB
C++
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucasfilm
|
|
// Entertainment Company Ltd. Portions contributed and copyright held by
|
|
// others as indicated. 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
|
|
// any other contributors to this software 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.
|
|
//
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// Conversion between RGBA and YCA data.
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#include <ImfRgbaYca.h>
|
|
#include <assert.h>
|
|
#include <algorithm>
|
|
|
|
using namespace Imath;
|
|
using namespace std;
|
|
|
|
namespace Imf {
|
|
namespace RgbaYca {
|
|
|
|
|
|
V3f
|
|
computeYw (const Chromaticities &cr)
|
|
{
|
|
M44f m = RGBtoXYZ (cr, 1);
|
|
return V3f (m[0][1], m[1][1], m[2][1]) / (m[0][1] + m[1][1] + m[2][1]);
|
|
}
|
|
|
|
|
|
void
|
|
RGBAtoYCA (const V3f &yw,
|
|
int n,
|
|
bool aIsValid,
|
|
const Rgba rgbaIn[/*n*/],
|
|
Rgba ycaOut[/*n*/])
|
|
{
|
|
for (int i = 0; i < n; ++i)
|
|
{
|
|
Rgba in = rgbaIn[i];
|
|
Rgba &out = ycaOut[i];
|
|
|
|
//
|
|
// Conversion to YCA and subsequent chroma subsampling
|
|
// work only if R, G and B are finite and non-negative.
|
|
//
|
|
|
|
if (!in.r.isFinite() || in.r < 0)
|
|
in.r = 0;
|
|
|
|
if (!in.g.isFinite() || in.g < 0)
|
|
in.g = 0;
|
|
|
|
if (!in.b.isFinite() || in.b < 0)
|
|
in.b = 0;
|
|
|
|
if (in.r == in.g && in.g == in.b)
|
|
{
|
|
//
|
|
// Special case -- R, G and B are equal. To avoid rounding
|
|
// errors, we explicitly set the output luminance channel
|
|
// to G, and the chroma channels to 0.
|
|
//
|
|
// The special cases here and in YCAtoRGBA() ensure that
|
|
// converting black-and white images from RGBA to YCA and
|
|
// back is lossless.
|
|
//
|
|
|
|
out.r = 0;
|
|
out.g = in.g;
|
|
out.b = 0;
|
|
}
|
|
else
|
|
{
|
|
out.g = in.r * yw.x + in.g * yw.y + in.b * yw.z;
|
|
|
|
float Y = out.g;
|
|
|
|
if (abs (in.r - Y) < HALF_MAX * Y)
|
|
out.r = (in.r - Y) / Y;
|
|
else
|
|
out.r = 0;
|
|
|
|
if (abs (in.b - Y) < HALF_MAX * Y)
|
|
out.b = (in.b - Y) / Y;
|
|
else
|
|
out.b = 0;
|
|
}
|
|
|
|
if (aIsValid)
|
|
out.a = in.a;
|
|
else
|
|
out.a = 1;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
decimateChromaHoriz (int n,
|
|
const Rgba ycaIn[/*n+N-1*/],
|
|
Rgba ycaOut[/*n*/])
|
|
{
|
|
#ifdef DEBUG
|
|
assert (ycaIn != ycaOut);
|
|
#endif
|
|
|
|
int begin = N2;
|
|
int end = begin + n;
|
|
|
|
for (int i = begin, j = 0; i < end; ++i, ++j)
|
|
{
|
|
if ((j & 1) == 0)
|
|
{
|
|
ycaOut[j].r = ycaIn[i - 13].r * 0.001064f +
|
|
ycaIn[i - 11].r * -0.003771f +
|
|
ycaIn[i - 9].r * 0.009801f +
|
|
ycaIn[i - 7].r * -0.021586f +
|
|
ycaIn[i - 5].r * 0.043978f +
|
|
ycaIn[i - 3].r * -0.093067f +
|
|
ycaIn[i - 1].r * 0.313659f +
|
|
ycaIn[i ].r * 0.499846f +
|
|
ycaIn[i + 1].r * 0.313659f +
|
|
ycaIn[i + 3].r * -0.093067f +
|
|
ycaIn[i + 5].r * 0.043978f +
|
|
ycaIn[i + 7].r * -0.021586f +
|
|
ycaIn[i + 9].r * 0.009801f +
|
|
ycaIn[i + 11].r * -0.003771f +
|
|
ycaIn[i + 13].r * 0.001064f;
|
|
|
|
ycaOut[j].b = ycaIn[i - 13].b * 0.001064f +
|
|
ycaIn[i - 11].b * -0.003771f +
|
|
ycaIn[i - 9].b * 0.009801f +
|
|
ycaIn[i - 7].b * -0.021586f +
|
|
ycaIn[i - 5].b * 0.043978f +
|
|
ycaIn[i - 3].b * -0.093067f +
|
|
ycaIn[i - 1].b * 0.313659f +
|
|
ycaIn[i ].b * 0.499846f +
|
|
ycaIn[i + 1].b * 0.313659f +
|
|
ycaIn[i + 3].b * -0.093067f +
|
|
ycaIn[i + 5].b * 0.043978f +
|
|
ycaIn[i + 7].b * -0.021586f +
|
|
ycaIn[i + 9].b * 0.009801f +
|
|
ycaIn[i + 11].b * -0.003771f +
|
|
ycaIn[i + 13].b * 0.001064f;
|
|
}
|
|
|
|
ycaOut[j].g = ycaIn[i].g;
|
|
ycaOut[j].a = ycaIn[i].a;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
decimateChromaVert (int n,
|
|
const Rgba * const ycaIn[N],
|
|
Rgba ycaOut[/*n*/])
|
|
{
|
|
for (int i = 0; i < n; ++i)
|
|
{
|
|
if ((i & 1) == 0)
|
|
{
|
|
ycaOut[i].r = ycaIn[ 0][i].r * 0.001064f +
|
|
ycaIn[ 2][i].r * -0.003771f +
|
|
ycaIn[ 4][i].r * 0.009801f +
|
|
ycaIn[ 6][i].r * -0.021586f +
|
|
ycaIn[ 8][i].r * 0.043978f +
|
|
ycaIn[10][i].r * -0.093067f +
|
|
ycaIn[12][i].r * 0.313659f +
|
|
ycaIn[13][i].r * 0.499846f +
|
|
ycaIn[14][i].r * 0.313659f +
|
|
ycaIn[16][i].r * -0.093067f +
|
|
ycaIn[18][i].r * 0.043978f +
|
|
ycaIn[20][i].r * -0.021586f +
|
|
ycaIn[22][i].r * 0.009801f +
|
|
ycaIn[24][i].r * -0.003771f +
|
|
ycaIn[26][i].r * 0.001064f;
|
|
|
|
ycaOut[i].b = ycaIn[ 0][i].b * 0.001064f +
|
|
ycaIn[ 2][i].b * -0.003771f +
|
|
ycaIn[ 4][i].b * 0.009801f +
|
|
ycaIn[ 6][i].b * -0.021586f +
|
|
ycaIn[ 8][i].b * 0.043978f +
|
|
ycaIn[10][i].b * -0.093067f +
|
|
ycaIn[12][i].b * 0.313659f +
|
|
ycaIn[13][i].b * 0.499846f +
|
|
ycaIn[14][i].b * 0.313659f +
|
|
ycaIn[16][i].b * -0.093067f +
|
|
ycaIn[18][i].b * 0.043978f +
|
|
ycaIn[20][i].b * -0.021586f +
|
|
ycaIn[22][i].b * 0.009801f +
|
|
ycaIn[24][i].b * -0.003771f +
|
|
ycaIn[26][i].b * 0.001064f;
|
|
}
|
|
|
|
ycaOut[i].g = ycaIn[13][i].g;
|
|
ycaOut[i].a = ycaIn[13][i].a;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
roundYCA (int n,
|
|
unsigned int roundY,
|
|
unsigned int roundC,
|
|
const Rgba ycaIn[/*n*/],
|
|
Rgba ycaOut[/*n*/])
|
|
{
|
|
for (int i = 0; i < n; ++i)
|
|
{
|
|
ycaOut[i].g = ycaIn[i].g.round (roundY);
|
|
ycaOut[i].a = ycaIn[i].a;
|
|
|
|
if ((i & 1) == 0)
|
|
{
|
|
ycaOut[i].r = ycaIn[i].r.round (roundC);
|
|
ycaOut[i].b = ycaIn[i].b.round (roundC);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
reconstructChromaHoriz (int n,
|
|
const Rgba ycaIn[/*n+N-1*/],
|
|
Rgba ycaOut[/*n*/])
|
|
{
|
|
#ifdef DEBUG
|
|
assert (ycaIn != ycaOut);
|
|
#endif
|
|
|
|
int begin = N2;
|
|
int end = begin + n;
|
|
|
|
for (int i = begin, j = 0; i < end; ++i, ++j)
|
|
{
|
|
if (j & 1)
|
|
{
|
|
ycaOut[j].r = ycaIn[i - 13].r * 0.002128f +
|
|
ycaIn[i - 11].r * -0.007540f +
|
|
ycaIn[i - 9].r * 0.019597f +
|
|
ycaIn[i - 7].r * -0.043159f +
|
|
ycaIn[i - 5].r * 0.087929f +
|
|
ycaIn[i - 3].r * -0.186077f +
|
|
ycaIn[i - 1].r * 0.627123f +
|
|
ycaIn[i + 1].r * 0.627123f +
|
|
ycaIn[i + 3].r * -0.186077f +
|
|
ycaIn[i + 5].r * 0.087929f +
|
|
ycaIn[i + 7].r * -0.043159f +
|
|
ycaIn[i + 9].r * 0.019597f +
|
|
ycaIn[i + 11].r * -0.007540f +
|
|
ycaIn[i + 13].r * 0.002128f;
|
|
|
|
ycaOut[j].b = ycaIn[i - 13].b * 0.002128f +
|
|
ycaIn[i - 11].b * -0.007540f +
|
|
ycaIn[i - 9].b * 0.019597f +
|
|
ycaIn[i - 7].b * -0.043159f +
|
|
ycaIn[i - 5].b * 0.087929f +
|
|
ycaIn[i - 3].b * -0.186077f +
|
|
ycaIn[i - 1].b * 0.627123f +
|
|
ycaIn[i + 1].b * 0.627123f +
|
|
ycaIn[i + 3].b * -0.186077f +
|
|
ycaIn[i + 5].b * 0.087929f +
|
|
ycaIn[i + 7].b * -0.043159f +
|
|
ycaIn[i + 9].b * 0.019597f +
|
|
ycaIn[i + 11].b * -0.007540f +
|
|
ycaIn[i + 13].b * 0.002128f;
|
|
}
|
|
else
|
|
{
|
|
ycaOut[j].r = ycaIn[i].r;
|
|
ycaOut[j].b = ycaIn[i].b;
|
|
}
|
|
|
|
ycaOut[j].g = ycaIn[i].g;
|
|
ycaOut[j].a = ycaIn[i].a;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
reconstructChromaVert (int n,
|
|
const Rgba * const ycaIn[N],
|
|
Rgba ycaOut[/*n*/])
|
|
{
|
|
for (int i = 0; i < n; ++i)
|
|
{
|
|
ycaOut[i].r = ycaIn[ 0][i].r * 0.002128f +
|
|
ycaIn[ 2][i].r * -0.007540f +
|
|
ycaIn[ 4][i].r * 0.019597f +
|
|
ycaIn[ 6][i].r * -0.043159f +
|
|
ycaIn[ 8][i].r * 0.087929f +
|
|
ycaIn[10][i].r * -0.186077f +
|
|
ycaIn[12][i].r * 0.627123f +
|
|
ycaIn[14][i].r * 0.627123f +
|
|
ycaIn[16][i].r * -0.186077f +
|
|
ycaIn[18][i].r * 0.087929f +
|
|
ycaIn[20][i].r * -0.043159f +
|
|
ycaIn[22][i].r * 0.019597f +
|
|
ycaIn[24][i].r * -0.007540f +
|
|
ycaIn[26][i].r * 0.002128f;
|
|
|
|
ycaOut[i].b = ycaIn[ 0][i].b * 0.002128f +
|
|
ycaIn[ 2][i].b * -0.007540f +
|
|
ycaIn[ 4][i].b * 0.019597f +
|
|
ycaIn[ 6][i].b * -0.043159f +
|
|
ycaIn[ 8][i].b * 0.087929f +
|
|
ycaIn[10][i].b * -0.186077f +
|
|
ycaIn[12][i].b * 0.627123f +
|
|
ycaIn[14][i].b * 0.627123f +
|
|
ycaIn[16][i].b * -0.186077f +
|
|
ycaIn[18][i].b * 0.087929f +
|
|
ycaIn[20][i].b * -0.043159f +
|
|
ycaIn[22][i].b * 0.019597f +
|
|
ycaIn[24][i].b * -0.007540f +
|
|
ycaIn[26][i].b * 0.002128f;
|
|
|
|
ycaOut[i].g = ycaIn[13][i].g;
|
|
ycaOut[i].a = ycaIn[13][i].a;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
YCAtoRGBA (const Imath::V3f &yw,
|
|
int n,
|
|
const Rgba ycaIn[/*n*/],
|
|
Rgba rgbaOut[/*n*/])
|
|
{
|
|
for (int i = 0; i < n; ++i)
|
|
{
|
|
const Rgba &in = ycaIn[i];
|
|
Rgba &out = rgbaOut[i];
|
|
|
|
if (in.r == 0 && in.b == 0)
|
|
{
|
|
//
|
|
// Special case -- both chroma channels are 0. To avoid
|
|
// rounding errors, we explicitly set the output R, G and B
|
|
// channels equal to the input luminance.
|
|
//
|
|
// The special cases here and in RGBAtoYCA() ensure that
|
|
// converting black-and white images from RGBA to YCA and
|
|
// back is lossless.
|
|
//
|
|
|
|
out.r = in.g;
|
|
out.g = in.g;
|
|
out.b = in.g;
|
|
out.a = in.a;
|
|
}
|
|
else
|
|
{
|
|
float Y = in.g;
|
|
float r = (in.r + 1) * Y;
|
|
float b = (in.b + 1) * Y;
|
|
float g = (Y - r * yw.x - b * yw.z) / yw.y;
|
|
|
|
out.r = r;
|
|
out.g = g;
|
|
out.b = b;
|
|
out.a = in.a;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
namespace {
|
|
|
|
inline float
|
|
saturation (const Rgba &in)
|
|
{
|
|
float rgbMax = max (in.r, max (in.g, in.b));
|
|
float rgbMin = min (in.r, min (in.g, in.b));
|
|
|
|
if (rgbMax > 0)
|
|
return 1 - rgbMin / rgbMax;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
void
|
|
desaturate (const Rgba &in, float f, const V3f &yw, Rgba &out)
|
|
{
|
|
float rgbMax = max (in.r, max (in.g, in.b));
|
|
|
|
out.r = max (float (rgbMax - (rgbMax - in.r) * f), 0.0f);
|
|
out.g = max (float (rgbMax - (rgbMax - in.g) * f), 0.0f);
|
|
out.b = max (float (rgbMax - (rgbMax - in.b) * f), 0.0f);
|
|
out.a = in.a;
|
|
|
|
float Yin = in.r * yw.x + in.g * yw.y + in.b * yw.z;
|
|
float Yout = out.r * yw.x + out.g * yw.y + out.b * yw.z;
|
|
|
|
if (Yout > 0)
|
|
{
|
|
out.r *= Yin / Yout;
|
|
out.g *= Yin / Yout;
|
|
out.b *= Yin / Yout;
|
|
}
|
|
}
|
|
|
|
} // namespace
|
|
|
|
|
|
void
|
|
fixSaturation (const Imath::V3f &yw,
|
|
int n,
|
|
const Rgba * const rgbaIn[3],
|
|
Rgba rgbaOut[/*n*/])
|
|
{
|
|
float neighborA2 = saturation (rgbaIn[0][0]);
|
|
float neighborA1 = neighborA2;
|
|
|
|
float neighborB2 = saturation (rgbaIn[2][0]);
|
|
float neighborB1 = neighborB2;
|
|
|
|
for (int i = 0; i < n; ++i)
|
|
{
|
|
float neighborA0 = neighborA1;
|
|
neighborA1 = neighborA2;
|
|
|
|
float neighborB0 = neighborB1;
|
|
neighborB1 = neighborB2;
|
|
|
|
if (i < n - 1)
|
|
{
|
|
neighborA2 = saturation (rgbaIn[0][i + 1]);
|
|
neighborB2 = saturation (rgbaIn[2][i + 1]);
|
|
}
|
|
|
|
//
|
|
// A0 A1 A2
|
|
// rgbaOut[i]
|
|
// B0 B1 B2
|
|
//
|
|
|
|
float sMean = min (1.0f, 0.25f * (neighborA0 + neighborA2 +
|
|
neighborB0 + neighborB2));
|
|
|
|
const Rgba &in = rgbaIn[1][i];
|
|
Rgba &out = rgbaOut[i];
|
|
|
|
float s = saturation (in);
|
|
|
|
if (s > sMean)
|
|
{
|
|
float sMax = min (1.0f, 1 - (1 - sMean) * 0.25f);
|
|
|
|
if (s > sMax)
|
|
{
|
|
desaturate (in, sMax / s, yw, out);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
out = in;
|
|
}
|
|
}
|
|
|
|
} // namespace RgbaYca
|
|
} // namespace Imf
|