Subject: [Boost-commit] svn:boost r84060 - trunk/boost/gil/extension/toolbox/color_spaces
From: chhenning_at_[hidden]
Date: 2013-04-27 22:33:19
Author: chhenning
Date: 2013-04-27 22:33:18 EDT (Sat, 27 Apr 2013)
New Revision: 84060
URL: http://svn.boost.org/trac/boost/changeset/84060
Log:
Added ycbcr 709 pixel type and conversions.
Text files modified:
trunk/boost/gil/extension/toolbox/color_spaces/ycbcr.hpp | 94 +++++++++++++++++++++++++++++++++++----
1 files changed, 83 insertions(+), 11 deletions(-)
Modified: trunk/boost/gil/extension/toolbox/color_spaces/ycbcr.hpp
==============================================================================
--- trunk/boost/gil/extension/toolbox/color_spaces/ycbcr.hpp (original)
+++ trunk/boost/gil/extension/toolbox/color_spaces/ycbcr.hpp 2013-04-27 22:33:18 EDT (Sat, 27 Apr 2013)
@@ -31,29 +31,44 @@
/// \addtogroup ColorNameModel
/// \{
-namespace ycbcr_color_space
+namespace ycbcr_601_color_space
{
/// \brief Luminance
struct y_t {};
/// \brief Blue chrominance component
struct cb_t {};
/// \brief Red chrominance component
-struct cr_t {};
+struct cr_t {};
+}
+
+namespace ycbcr_709_color_space
+{
+/// \brief Luminance
+struct y_t {};
+/// \brief Blue chrominance component
+struct cb_t {};
+/// \brief Red chrominance component
+struct cr_t {};
}
/// \}
/// \ingroup ColorSpaceModel
-typedef boost::mpl::vector3<ycbcr_color_space::y_t, ycbcr_color_space::cb_t, ycbcr_color_space::cr_t> ycbcr_601__t;
+typedef boost::mpl::vector3< ycbcr_601_color_space::y_t, ycbcr_601_color_space::cb_t, ycbcr_601_color_space::cr_t > ycbcr_601__t;
+typedef boost::mpl::vector3< ycbcr_709_color_space::y_t, ycbcr_709_color_space::cb_t, ycbcr_709_color_space::cr_t > ycbcr_709__t;
/// \ingroup LayoutModel
typedef boost::gil::layout<ycbcr_601__t> ycbcr_601__layout_t;
+typedef boost::gil::layout<ycbcr_709__t> ycbcr_709__layout_t;
//The channel depth is ALWAYS 8bits ofr YCbCr!
GIL_DEFINE_ALL_TYPEDEFS(8, ycbcr_601_)
+GIL_DEFINE_ALL_TYPEDEFS(8, ycbcr_709_)
/*
- * Source: http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
+ * 601 Source: http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
+ * 709 Source: http://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.709_conversion
* (using values coming directly from ITU-R BT.601 recommendation)
+ * (using values coming directly from ITU-R BT.709 recommendation)
*/
/**
@@ -68,7 +83,9 @@
{
typedef channel_type< DSTP >::type dst_channel_t;
convert( src, dst
- , boost::is_same< mpl::int_<8>::type, mpl::int_<8>::type >::type()
+ , boost::is_same< mpl::int_< sizeof( dst_channel_t ) >::type
+ , mpl::int_<1>::type
+ >::type()
);
}
@@ -84,7 +101,7 @@
) const
{
using namespace boost::algorithm;
- using namespace boost::gil::ycbcr_color_space;
+ using namespace ycbcr_601_color_space;
typedef channel_type< Src_Pixel >::type src_channel_t;
typedef channel_type< Dst_Pixel >::type dst_channel_t;
@@ -110,15 +127,15 @@
template< typename Src_Pixel
, typename Dst_Pixel
>
- void convert( const Src_Pixel& s
- , Dst_Pixel& d
+ void convert( const Src_Pixel& src
+ , Dst_Pixel& dst
, mpl::false_ // is 8 bit channel
) const
{
using namespace boost::algorithm;
- using namespace boost::gil::ycbcr_color_space;
+ using namespace ycbcr_601_color_space;
- typedef channel_type< DSTP >::type dst_channel_t;
+ typedef channel_type< Dst_Pixel >::type dst_channel_t;
double y = get_color( src, y_t() );
double cb = get_color( src, cb_t() );
@@ -155,7 +172,7 @@
template < typename SRCP, typename DSTP >
void operator()( const SRCP& src, DSTP& dst ) const
{
- using namespace boost::gil::ycbcr_color_space;
+ using namespace ycbcr_601_color_space;
typedef channel_type< SRCP >::type src_channel_t;
typedef channel_type< DSTP >::type dst_channel_t;
@@ -168,6 +185,33 @@
double cb = 128.0 - 0.1482 * red - 0.2909 * green + 0.4392 * blue;
double cr = 128.0 + 0.4392 * red - 0.3677 * green - 0.0714 * blue;
+ get_color( dst, y_t() ) = (dst_channel_t) y;
+ get_color( dst, cb_t() ) = (dst_channel_t) cb;
+ get_color( dst, cr_t() ) = (dst_channel_t) cr;
+ }
+};
+
+/**
+* @brief Convert RGB to YCbCr ITU.BT-709.
+*/
+template<>
+struct default_color_converter_impl<rgb_t, ycbcr_709__t>
+{
+ template < typename SRCP, typename DSTP >
+ void operator()( const SRCP& src, DSTP& dst ) const
+ {
+ using namespace ycbcr_709_color_space;
+
+ typedef channel_type< SRCP >::type src_channel_t;
+ typedef channel_type< DSTP >::type dst_channel_t;
+
+ src_channel_t red = channel_convert<src_channel_t>( get_color(src, red_t()));
+ src_channel_t green = channel_convert<src_channel_t>( get_color(src, green_t()));
+ src_channel_t blue = channel_convert<src_channel_t>( get_color(src, blue_t()));
+
+ double y = 0.299 * red + 0.587 * green + 0.114 * blue;
+ double cb = 128.0 - 0.168736 * red - 0.331264 * green + 0.5 * blue;
+ double cr = 128.0 + 0.5 * red - 0.418688 * green - 0.081312 * blue;
get_color( dst, y_t() ) = (dst_channel_t) y;
get_color( dst, cb_t() ) = (dst_channel_t) cb;
@@ -175,6 +219,34 @@
}
};
+/**
+* @brief Convert RGB to YCbCr ITU.BT-709.
+*/
+template<>
+struct default_color_converter_impl<ycbcr_709__t, rgb_t>
+{
+ template < typename SRCP, typename DSTP >
+ void operator()( const SRCP& src, DSTP& dst ) const
+ {
+ using namespace ycbcr_709_color_space;
+
+ typedef channel_type< SRCP >::type src_channel_t;
+ typedef channel_type< DSTP >::type dst_channel_t;
+
+ src_channel_t y = channel_convert<src_channel_t>( get_color(src, y_t()) );
+ src_channel_t cb_clipped = channel_convert<src_channel_t>( get_color(src, cb_t()) - 128 );
+ src_channel_t cr_clipped = channel_convert<src_channel_t>( get_color(src, cr_t()) - 128 );
+
+ double red = y + 1.042 * cr_clipped;
+ double green = y - 0.34414 * cb_clipped - 0.71414 * cr_clipped;
+ double blue = y + 1.772 * cb_clipped;
+
+ get_color( dst, red_t() ) = (dst_channel_t) red;
+ get_color( dst, green_t() ) = (dst_channel_t) green;
+ get_color( dst, blue_t() ) = (dst_channel_t) blue;
+ }
+};
+
} // namespace gil
} // namespace boost