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Added implementation for RGB to YUV420p color conversion

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This commit is contained in:
Daniil Osokin 2013-02-24 21:50:08 +04:00
parent da1ddc752b
commit 7255ede3af
2 changed files with 93 additions and 2 deletions
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16
modules/imgproc/include/opencv2/imgproc/types_c.h
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@ -309,8 +309,22 @@ enum
// alpha premultiplication
CV_RGBA2mRGBA = 125,
CV_mRGBA2RGBA = 126,
CV_RGB2YUV_I420 = 127,
CV_BGR2YUV_I420 = 128,
CV_RGB2YUV_IYUV = CV_RGB2YUV_I420,
CV_BGR2YUV_IYUV = CV_BGR2YUV_I420,
CV_COLORCVT_MAX = 127
CV_RGBA2YUV_I420 = 129,
CV_BGRA2YUV_I420 = 130,
CV_RGBA2YUV_IYUV = CV_RGBA2YUV_I420,
CV_BGRA2YUV_IYUV = CV_BGRA2YUV_I420,
CV_RGB2YUV_YV12 = 131,
CV_BGR2YUV_YV12 = 132,
CV_RGBA2YUV_YV12 = 133,
CV_BGRA2YUV_YV12 = 134,
CV_COLORCVT_MAX = 135
};

79
modules/imgproc/src/color.cpp
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@ -3076,6 +3076,58 @@ inline void cvtYUV420p2RGBA(Mat& _dst, int _stride, const uchar* _y1, const ucha
converter(BlockedRange(0, _dst.rows/2));
}
///////////////////////////////////// RGB -> YUV420p /////////////////////////////////////
template<int bIdx, int uIdx>
static void cvtRGBtoYUV420p(const Mat& src, Mat& dst)
{
//const float coeffs[] = { 0.257f, 0.504f, 0.098f,
// -0.148f, -0.291f, 0.439f,
// -0.368f, -0.071f };
const int coeffs[] = { 269484, 528482, 102760,
-155188, -305135, 460324,
-385875, -74448 };
const int w = src.cols;
const int h = src.rows;
const int cn = src.channels();
for( int i = 0; i < h / 2; i++ )
{
const uchar* row0 = src.ptr<uchar>(2*i);
const uchar* row1 = src.ptr<uchar>(2*i + 1);
uchar* y = dst.ptr<uchar>(2*i);
uchar* u = dst.ptr<uchar>(h + i/2) + (i % 2) * (w/2);
uchar* v = dst.ptr<uchar>(h + (i + h/2)/2) + ((i + h/2) % 2) * (w/2);
if( uIdx == 2 ) std::swap(u, v);
for( int j = 0, k = 0; j < w * cn; j += 2*cn, k++ )
{
int r00 = row0[2-bIdx + j]; int g00 = row0[1 + j]; int b00 = row0[bIdx + j];
int r01 = row0[2-bIdx + cn + j]; int g01 = row0[1 + cn + j]; int b01 = row0[bIdx + cn + j];
int r10 = row1[2-bIdx + j]; int g10 = row1[1 + j]; int b10 = row1[bIdx + j];
int r11 = row1[2-bIdx + cn + j]; int g11 = row1[1 + cn + j]; int b11 = row1[bIdx + cn + j];
int y00 = coeffs[0]*r00 + coeffs[1]*g00 + coeffs[2]*b00 + (1 << (ITUR_BT_601_SHIFT - 1)) + (16 << ITUR_BT_601_SHIFT);
int y01 = coeffs[0]*r01 + coeffs[1]*g01 + coeffs[2]*b01 + (1 << (ITUR_BT_601_SHIFT - 1)) + (16 << ITUR_BT_601_SHIFT);
int y10 = coeffs[0]*r10 + coeffs[1]*g10 + coeffs[2]*b10 + (1 << (ITUR_BT_601_SHIFT - 1)) + (16 << ITUR_BT_601_SHIFT);
int y11 = coeffs[0]*r11 + coeffs[1]*g11 + coeffs[2]*b11 + (1 << (ITUR_BT_601_SHIFT - 1)) + (16 << ITUR_BT_601_SHIFT);
y[2*k + 0] = saturate_cast<uchar>(y00 >> ITUR_BT_601_SHIFT);
y[2*k + 1] = saturate_cast<uchar>(y01 >> ITUR_BT_601_SHIFT);
y[2*k + dst.step + 0] = saturate_cast<uchar>(y10 >> ITUR_BT_601_SHIFT);
y[2*k + dst.step + 1] = saturate_cast<uchar>(y11 >> ITUR_BT_601_SHIFT);
int u00 = coeffs[3]*r00 + coeffs[4]*g00 + coeffs[5]*b00 + (1 << (ITUR_BT_601_SHIFT - 1)) + (128 << ITUR_BT_601_SHIFT);
int v00 = coeffs[5]*r00 + coeffs[6]*g00 + coeffs[7]*b00 + (1 << (ITUR_BT_601_SHIFT - 1)) + (128 << ITUR_BT_601_SHIFT);
u[k] = saturate_cast<uchar>(u00 >> ITUR_BT_601_SHIFT);
v[k] = saturate_cast<uchar>(v00 >> ITUR_BT_601_SHIFT);
}
}
}
///////////////////////////////////// YUV422 -> RGB /////////////////////////////////////
template<int bIdx, int uIdx, int yIdx>
@ -3713,6 +3765,31 @@ void cv::cvtColor( InputArray _src, OutputArray _dst, int code, int dcn )
src(Range(0, dstSz.height), Range::all()).copyTo(dst);
}
break;
case CV_RGB2YUV_YV12: case CV_BGR2YUV_YV12: case CV_RGBA2YUV_YV12: case CV_BGRA2YUV_YV12:
case CV_RGB2YUV_IYUV: case CV_BGR2YUV_IYUV: case CV_RGBA2YUV_IYUV: case CV_BGRA2YUV_IYUV:
{
if (dcn <= 0) dcn = 1;
const int bIdx = (code == CV_BGR2YUV_IYUV || code == CV_BGRA2YUV_IYUV || code == CV_BGR2YUV_YV12 || code == CV_BGRA2YUV_YV12) ? 0 : 2;
const int uIdx = (code == CV_BGR2YUV_IYUV || code == CV_BGRA2YUV_IYUV || code == CV_RGB2YUV_IYUV || code == CV_RGBA2YUV_IYUV) ? 1 : 2;
CV_Assert( (scn == 3 || scn == 4) && depth == CV_8U );
CV_Assert( dcn == 1 );
CV_Assert( sz.width % 2 == 0 && sz.height % 2 == 0 );
Size dstSz(sz.width, sz.height / 2 * 3);
_dst.create(dstSz, CV_MAKETYPE(depth, dcn));
dst = _dst.getMat();
switch(bIdx + uIdx*10)
{
case 10: cvtRGBtoYUV420p<0, 1>(src, dst); break;
case 12: cvtRGBtoYUV420p<2, 1>(src, dst); break;
case 20: cvtRGBtoYUV420p<0, 2>(src, dst); break;
case 22: cvtRGBtoYUV420p<2, 2>(src, dst); break;
default: CV_Error( CV_StsBadFlag, "Unknown/unsupported color conversion code" ); break;
};
}
break;
case CV_YUV2RGB_UYVY: case CV_YUV2BGR_UYVY: case CV_YUV2RGBA_UYVY: case CV_YUV2BGRA_UYVY:
case CV_YUV2RGB_YUY2: case CV_YUV2BGR_YUY2: case CV_YUV2RGB_YVYU: case CV_YUV2BGR_YVYU:
case CV_YUV2RGBA_YUY2: case CV_YUV2BGRA_YUY2: case CV_YUV2RGBA_YVYU: case CV_YUV2BGRA_YVYU:
@ -3795,7 +3872,7 @@ void cv::cvtColor( InputArray _src, OutputArray _dst, int code, int dcn )
CV_Error( CV_StsBadArg, "Unsupported image depth" );
}
}
break;
break;
default:
CV_Error( CV_StsBadFlag, "Unknown/unsupported color conversion code" );
}