Merge pull request #491 from Daniil-Osokin:cvtRGB2YUV420p

modules/imgproc/include/opencv2/imgproc/types_c.h

@@ -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
 };
 
 

modules/imgproc/perf/perf_cvt_color.cpp

@@ -115,6 +115,9 @@ CV_ENUM(CvtMode2, CV_YUV2BGR_NV12, CV_YUV2BGRA_NV12, CV_YUV2RGB_NV12, CV_YUV2RGB
                   COLOR_YUV2GRAY_420, CV_YUV2RGB_UYVY, CV_YUV2BGR_UYVY, CV_YUV2RGBA_UYVY, CV_YUV2BGRA_UYVY, CV_YUV2RGB_YUY2, CV_YUV2BGR_YUY2, CV_YUV2RGB_YVYU,
                   CV_YUV2BGR_YVYU, CV_YUV2RGBA_YUY2, CV_YUV2BGRA_YUY2, CV_YUV2RGBA_YVYU, CV_YUV2BGRA_YVYU)
 
+CV_ENUM(CvtMode3, CV_RGB2YUV_IYUV, CV_BGR2YUV_IYUV, CV_RGBA2YUV_IYUV, CV_BGRA2YUV_IYUV,
+                  CV_RGB2YUV_YV12, CV_BGR2YUV_YV12, CV_RGBA2YUV_YV12, CV_BGRA2YUV_YV12)
+
 struct ChPair
 {
     ChPair(int _scn, int _dcn): scn(_scn), dcn(_dcn) {}
@@ -162,6 +165,8 @@ ChPair getConversionInfo(int cvtMode)
     case CV_BGR5652BGRA: case CV_BGR5652RGBA:
         return ChPair(2,4);
     case CV_BGR2GRAY: case CV_RGB2GRAY:
+    case CV_RGB2YUV_IYUV: case CV_RGB2YUV_YV12:
+    case CV_BGR2YUV_IYUV: case CV_BGR2YUV_YV12:
         return ChPair(3,1);
     case CV_BGR2BGR555: case CV_BGR2BGR565:
     case CV_RGB2BGR555: case CV_RGB2BGR565:
@@ -204,6 +209,8 @@ ChPair getConversionInfo(int cvtMode)
     case CX_YUV2BGRA: case CX_YUV2RGBA:
         return ChPair(3,4);
     case CV_BGRA2GRAY: case CV_RGBA2GRAY:
+    case CV_RGBA2YUV_IYUV: case CV_RGBA2YUV_YV12:
+    case CV_BGRA2YUV_IYUV: case CV_BGRA2YUV_YV12:
         return ChPair(4,1);
     case CV_BGRA2BGR555: case CV_BGRA2BGR565:
     case CV_RGBA2BGR555: case CV_RGBA2BGR565:
@@ -306,3 +313,28 @@ PERF_TEST_P(Size_CvtMode2, cvtColorYUV420,
 
     SANITY_CHECK(dst, 1);
 }
+
+typedef std::tr1::tuple<Size, CvtMode3> Size_CvtMode3_t;
+typedef perf::TestBaseWithParam<Size_CvtMode3_t> Size_CvtMode3;
+
+PERF_TEST_P(Size_CvtMode3, cvtColorRGB2YUV420p,
+            testing::Combine(
+                testing::Values(szVGA, sz720p, sz1080p, Size(130, 60)),
+                testing::ValuesIn(CvtMode3::all())
+                )
+            )
+{
+    Size sz = get<0>(GetParam());
+    int mode = get<1>(GetParam());
+    ChPair ch = getConversionInfo(mode);
+
+    Mat src(sz, CV_8UC(ch.scn));
+    Mat dst(sz.height + sz.height / 2, sz.width, CV_8UC(ch.dcn));
+
+    declare.time(100);
+    declare.in(src, WARMUP_RNG).out(dst);
+
+    TEST_CYCLE() cvtColor(src, dst, mode, ch.dcn);
+
+    SANITY_CHECK(dst, 1);
+}

modules/imgproc/src/color.cpp

@@ -2744,6 +2744,16 @@ const int ITUR_BT_601_CVG = -852492;
 const int ITUR_BT_601_CVR = 1673527;
 const int ITUR_BT_601_SHIFT = 20;
 
+// Coefficients for RGB to YUV420p conversion
+const int ITUR_BT_601_CRY =  269484;
+const int ITUR_BT_601_CGY =  528482;
+const int ITUR_BT_601_CBY =  102760;
+const int ITUR_BT_601_CRU = -155188;
+const int ITUR_BT_601_CGU = -305135;
+const int ITUR_BT_601_CBU =  460324;
+const int ITUR_BT_601_CGV = -385875;
+const int ITUR_BT_601_CBV = -74448;
+
 template<int bIdx, int uIdx>
 struct YUV420sp2RGB888Invoker
 {
@@ -3076,6 +3086,84 @@ inline void cvtYUV420p2RGBA(Mat& _dst, int _stride, const uchar* _y1, const ucha
         converter(BlockedRange(0, _dst.rows/2));
 }
 
+///////////////////////////////////// RGB -> YUV420p /////////////////////////////////////
+
+template<int bIdx>
+struct RGB888toYUV420pInvoker: public ParallelLoopBody
+{
+    RGB888toYUV420pInvoker( const Mat& src, Mat* dst, const int uIdx )
+        : src_(src),
+          dst_(dst),
+          uIdx_(uIdx) { }
+
+    void operator()(const Range& rowRange) const
+    {
+        const int w = src_.cols;
+        const int h = src_.rows;
+
+        const int cn = src_.channels();
+        for( int i = rowRange.start; i < rowRange.end; 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];
+
+                const int shifted16 = (16 << ITUR_BT_601_SHIFT);
+                const int halfShift = (1 << (ITUR_BT_601_SHIFT - 1));
+                int y00 = ITUR_BT_601_CRY * r00 + ITUR_BT_601_CGY * g00 + ITUR_BT_601_CBY * b00 + halfShift + shifted16;
+                int y01 = ITUR_BT_601_CRY * r01 + ITUR_BT_601_CGY * g01 + ITUR_BT_601_CBY * b01 + halfShift + shifted16;
+                int y10 = ITUR_BT_601_CRY * r10 + ITUR_BT_601_CGY * g10 + ITUR_BT_601_CBY * b10 + halfShift + shifted16;
+                int y11 = ITUR_BT_601_CRY * r11 + ITUR_BT_601_CGY * g11 + ITUR_BT_601_CBY * b11 + halfShift + shifted16;
+
+                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);
+
+                const int shifted128 = (128 << ITUR_BT_601_SHIFT);
+                int u00 = ITUR_BT_601_CRU * r00 + ITUR_BT_601_CGU * g00 + ITUR_BT_601_CBU * b00 + halfShift + shifted128;
+                int v00 = ITUR_BT_601_CBU * r00 + ITUR_BT_601_CGV * g00 + ITUR_BT_601_CBV * b00 + halfShift + shifted128;
+
+                u[k] = saturate_cast<uchar>(u00 >> ITUR_BT_601_SHIFT);
+                v[k] = saturate_cast<uchar>(v00 >> ITUR_BT_601_SHIFT);
+            }
+        }
+    }
+
+    static bool isFit( const Mat& src )
+    {
+        return (src.total() >= 320*240);
+    }
+
+private:
+    RGB888toYUV420pInvoker& operator=(const RGB888toYUV420pInvoker&);
+
+    const Mat& src_;
+    Mat* const dst_;
+    const int uIdx_;
+};
+
+template<int bIdx, int uIdx>
+static void cvtRGBtoYUV420p(const Mat& src, Mat& dst)
+{
+    RGB888toYUV420pInvoker<bIdx> colorConverter(src, &dst, uIdx);
+    if( RGB888toYUV420pInvoker<bIdx>::isFit(src) )
+        parallel_for_(Range(0, src.rows/2), colorConverter);
+    else
+        colorConverter(Range(0, src.rows/2));
+}
+
 ///////////////////////////////////// YUV422 -> RGB /////////////////////////////////////
 
 template<int bIdx, int uIdx, int yIdx>
@@ -3713,6 +3801,31 @@ 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 +3908,7 @@ 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" );
     }

modules/imgproc/test/test_cvtyuv.cpp

@@ -30,6 +30,16 @@ public:
     static YUVreader* getReader(int code);
 };
 
+class RGBreader
+{
+public:
+    virtual ~RGBreader() {}
+    virtual RGB read(const Mat& rgb, int row, int col) = 0;
+    virtual int channels() = 0;
+
+    static RGBreader* getReader(int code);
+};
+
 class RGBwriter
 {
 public:
@@ -56,6 +66,21 @@ public:
     static GRAYwriter* getWriter(int code);
 };
 
+class YUVwriter
+{
+public:
+    virtual ~YUVwriter() {}
+
+    virtual void write(Mat& yuv, int row, int col, const YUV& val) = 0;
+    virtual int channels() = 0;
+    virtual Size size(Size imgSize) = 0;
+
+    virtual bool requiresEvenHeight() { return true; }
+    virtual bool requiresEvenWidth() { return true; }
+
+    static YUVwriter* getWriter(int code);
+};
+
 class RGB888Writer : public RGBwriter
 {
     void write(Mat& rgb, int row, int col, const RGB& val)
@@ -99,6 +124,42 @@ class BGRA8888Writer : public RGBwriter
     int channels() { return 4; }
 };
 
+class YUV420pWriter: public YUVwriter
+{
+    int channels() { return 1; }
+    Size size(Size imgSize) { return Size(imgSize.width, imgSize.height + imgSize.height/2); }
+};
+
+class YV12Writer: public YUV420pWriter
+{
+    void write(Mat& yuv, int row, int col, const YUV& val)
+    {
+        int h = yuv.rows * 2 / 3;
+
+        yuv.ptr<uchar>(row)[col] = val[0];
+        if( row % 2 == 0 && col % 2 == 0 )
+        {
+            yuv.ptr<uchar>(h + row/4)[col/2 + ((row/2) % 2) * (yuv.cols/2)] = val[2];
+            yuv.ptr<uchar>(h + (row/2 + h/2)/2)[col/2 + ((row/2 + h/2) % 2) * (yuv.cols/2)] = val[1];
+        }
+    }
+};
+
+class I420Writer: public YUV420pWriter
+{
+    void write(Mat& yuv, int row, int col, const YUV& val)
+    {
+        int h = yuv.rows * 2 / 3;
+
+        yuv.ptr<uchar>(row)[col] = val[0];
+        if( row % 2 == 0 && col % 2 == 0 )
+        {
+            yuv.ptr<uchar>(h + row/4)[col/2 + ((row/2) % 2) * (yuv.cols/2)] = val[1];
+            yuv.ptr<uchar>(h + (row/2 + h/2)/2)[col/2 + ((row/2 + h/2) % 2) * (yuv.cols/2)] = val[2];
+        }
+    }
+};
+
 class YUV420Reader: public YUVreader
 {
     int channels() { return 1; }
@@ -212,6 +273,49 @@ class YUV888Reader : public YUVreader
     bool requiresEvenWidth() { return false; }
 };
 
+class RGB888Reader : public RGBreader
+{
+    RGB read(const Mat& rgb, int row, int col)
+    {
+        return rgb.at<RGB>(row, col);
+    }
+
+    int channels() { return 3; }
+};
+
+class BGR888Reader : public RGBreader
+{
+    RGB read(const Mat& rgb, int row, int col)
+    {
+        RGB tmp = rgb.at<RGB>(row, col);
+        return RGB(tmp[2], tmp[1], tmp[0]);
+    }
+
+    int channels() { return 3; }
+};
+
+class RGBA8888Reader : public RGBreader
+{
+    RGB read(const Mat& rgb, int row, int col)
+    {
+        Vec4b rgba = rgb.at<Vec4b>(row, col);
+        return RGB(rgba[0], rgba[1], rgba[2]);
+    }
+
+    int channels() { return 4; }
+};
+
+class BGRA8888Reader : public RGBreader
+{
+    RGB read(const Mat& rgb, int row, int col)
+    {
+        Vec4b rgba = rgb.at<Vec4b>(row, col);
+        return RGB(rgba[2], rgba[1], rgba[0]);
+    }
+
+    int channels() { return 4; }
+};
+
 class YUV2RGB_Converter
 {
 public:
@@ -237,6 +341,23 @@ public:
     }
 };
 
+class RGB2YUV_Converter
+{
+public:
+    YUV convert(RGB rgb)
+    {
+        int r = rgb[0];
+        int g = rgb[1];
+        int b = rgb[2];
+        
+        uchar y = saturate_cast<uchar>((int)( 0.257f*r + 0.504f*g + 0.098f*b + 0.5f) + 16);
+        uchar u = saturate_cast<uchar>((int)(-0.148f*r - 0.291f*g + 0.439f*b + 0.5f) + 128);
+        uchar v = saturate_cast<uchar>((int)( 0.439f*r - 0.368f*g - 0.071f*b + 0.5f) + 128);
+
+        return YUV(y, u, v);
+    }
+};
+
 YUVreader* YUVreader::getReader(int code)
 {
     switch(code)
@@ -295,6 +416,27 @@ YUVreader* YUVreader::getReader(int code)
     }
 }
 
+RGBreader* RGBreader::getReader(int code)
+{
+    switch(code)
+    {
+    case CV_RGB2YUV_YV12:
+    case CV_RGB2YUV_I420:
+        return new RGB888Reader();
+    case CV_BGR2YUV_YV12:
+    case CV_BGR2YUV_I420:
+        return new BGR888Reader();
+    case CV_RGBA2YUV_I420:
+    case CV_RGBA2YUV_YV12:
+        return new RGBA8888Reader();
+    case CV_BGRA2YUV_YV12:
+    case CV_BGRA2YUV_I420:
+        return new BGRA8888Reader();
+    default:
+        return 0;
+    };
+}
+
 RGBwriter* RGBwriter::getWriter(int code)
 {
     switch(code)
@@ -355,6 +497,25 @@ GRAYwriter* GRAYwriter::getWriter(int code)
     }
 }
 
+YUVwriter* YUVwriter::getWriter(int code)
+{
+    switch(code)
+    {
+    case CV_RGB2YUV_YV12:
+    case CV_BGR2YUV_YV12:
+    case CV_RGBA2YUV_YV12:
+    case CV_BGRA2YUV_YV12:
+        return new YV12Writer();
+    case CV_RGB2YUV_I420:
+    case CV_BGR2YUV_I420:
+    case CV_RGBA2YUV_I420:
+    case CV_BGRA2YUV_I420:
+        return new I420Writer();
+    default:
+        return 0;
+    };
+}
+
 template<class convertor>
 void referenceYUV2RGB(const Mat& yuv, Mat& rgb, YUVreader* yuvReader, RGBwriter* rgbWriter)
 {
@@ -375,6 +536,64 @@ void referenceYUV2GRAY(const Mat& yuv, Mat& rgb, YUVreader* yuvReader, GRAYwrite
             grayWriter->write(rgb, row, col, cvt.convert(yuvReader->read(yuv, row, col)));
 }
 
+template<class convertor>
+void referenceRGB2YUV(const Mat& rgb, Mat& yuv, RGBreader* rgbReader, YUVwriter* yuvWriter)
+{
+    convertor cvt;
+
+    for(int row = 0; row < rgb.rows; ++row)
+        for(int col = 0; col < rgb.cols; ++col)
+            yuvWriter->write(yuv, row, col, cvt.convert(rgbReader->read(rgb, row, col)));
+}
+
+struct ConversionYUV
+{
+    ConversionYUV( const int code )
+    {
+        yuvReader_  = YUVreader :: getReader(code);
+        yuvWriter_  = YUVwriter :: getWriter(code);
+        rgbReader_  = RGBreader :: getReader(code);
+        rgbWriter_  = RGBwriter :: getWriter(code);
+        grayWriter_ = GRAYwriter:: getWriter(code);
+    }
+
+    int getDcn()
+    {
+        return (rgbWriter_ != 0) ? rgbWriter_->channels() : ((grayWriter_ != 0) ? grayWriter_->channels() : yuvWriter_->channels());
+    }
+
+    int getScn()
+    {
+        return (yuvReader_ != 0) ? yuvReader_->channels() : rgbReader_->channels();
+    }
+
+    Size getSrcSize( const Size& imgSize )
+    {
+        return (yuvReader_ != 0) ? yuvReader_->size(imgSize) : imgSize;
+    }
+
+    Size getDstSize( const Size& imgSize )
+    {
+        return (yuvWriter_ != 0) ? yuvWriter_->size(imgSize) : imgSize;
+    }
+
+    bool requiresEvenHeight()
+    {
+        return (yuvReader_ != 0) ? yuvReader_->requiresEvenHeight() : ((yuvWriter_ != 0) ? yuvWriter_->requiresEvenHeight() : false);
+    }
+
+    bool requiresEvenWidth()
+    {
+        return (yuvReader_ != 0) ? yuvReader_->requiresEvenWidth() : ((yuvWriter_ != 0) ? yuvWriter_->requiresEvenWidth() : false);
+    }
+
+    YUVreader*  yuvReader_;
+    YUVwriter*  yuvWriter_;
+    RGBreader*  rgbReader_;
+    RGBwriter*  rgbWriter_;
+    GRAYwriter* grayWriter_;
+};
+
 CV_ENUM(YUVCVTS, CV_YUV2RGB_NV12, CV_YUV2BGR_NV12, CV_YUV2RGB_NV21, CV_YUV2BGR_NV21,
                  CV_YUV2RGBA_NV12, CV_YUV2BGRA_NV12, CV_YUV2RGBA_NV21, CV_YUV2BGRA_NV21,
                  CV_YUV2RGB_YV12, CV_YUV2BGR_YV12, CV_YUV2RGB_IYUV, CV_YUV2BGR_IYUV,
@@ -383,7 +602,8 @@ CV_ENUM(YUVCVTS, CV_YUV2RGB_NV12, CV_YUV2BGR_NV12, CV_YUV2RGB_NV21, CV_YUV2BGR_N
                  CV_YUV2RGB_YUY2, CV_YUV2BGR_YUY2, CV_YUV2RGB_YVYU, CV_YUV2BGR_YVYU,
                  CV_YUV2RGBA_YUY2, CV_YUV2BGRA_YUY2, CV_YUV2RGBA_YVYU, CV_YUV2BGRA_YVYU,
                  CV_YUV2GRAY_420, CV_YUV2GRAY_UYVY, CV_YUV2GRAY_YUY2,
-                 CV_YUV2BGR, CV_YUV2RGB);
+                 CV_YUV2BGR, CV_YUV2RGB, CV_RGB2YUV_YV12, CV_BGR2YUV_YV12, CV_RGBA2YUV_YV12,
+                 CV_BGRA2YUV_YV12, CV_RGB2YUV_I420, CV_BGR2YUV_I420, CV_RGBA2YUV_I420, CV_BGRA2YUV_I420);
 
 typedef ::testing::TestWithParam<YUVCVTS> Imgproc_ColorYUV;
 
@@ -392,31 +612,32 @@ TEST_P(Imgproc_ColorYUV, accuracy)
     int code = GetParam();
     RNG& random = theRNG();
 
-    YUVreader* yuvReader = YUVreader::getReader(code);
+    ConversionYUV cvt(code);
-    RGBwriter* rgbWriter = RGBwriter::getWriter(code);
-    GRAYwriter* grayWriter = GRAYwriter::getWriter(code);
-
-    int dcn = (rgbWriter == 0) ? grayWriter->channels() : rgbWriter->channels();
 
+    const int scn = cvt.getScn();
+    const int dcn = cvt.getDcn();
     for(int iter = 0; iter < 30; ++iter)
     {
         Size sz(random.uniform(1, 641), random.uniform(1, 481));
 
-        if(yuvReader->requiresEvenWidth()) sz.width += sz.width % 2;
+        if(cvt.requiresEvenWidth())  sz.width  += sz.width % 2;
-        if(yuvReader->requiresEvenHeight()) sz.height += sz.height % 2;
+        if(cvt.requiresEvenHeight()) sz.height += sz.height % 2;
 
-        Size ysz = yuvReader->size(sz);
+        Size srcSize = cvt.getSrcSize(sz);
-        Mat src = Mat(ysz.height, ysz.width * yuvReader->channels(), CV_8UC1).reshape(yuvReader->channels());
+        Mat src = Mat(srcSize.height, srcSize.width * scn, CV_8UC1).reshape(scn);
 
-        Mat dst = Mat(sz.height, sz.width * dcn, CV_8UC1).reshape(dcn);
+        Size dstSize = cvt.getDstSize(sz);
-        Mat gold(sz, CV_8UC(dcn));
+        Mat dst = Mat(dstSize.height, dstSize.width * dcn, CV_8UC1).reshape(dcn);
+        Mat gold(dstSize, CV_8UC(dcn));
 
         random.fill(src, RNG::UNIFORM, 0, 256);
 
-        if(rgbWriter)
+        if(cvt.rgbWriter_)
-            referenceYUV2RGB<YUV2RGB_Converter>(src, gold, yuvReader, rgbWriter);
+            referenceYUV2RGB<YUV2RGB_Converter>  (src, gold, cvt.yuvReader_, cvt.rgbWriter_);
-        else
+        else if(cvt.grayWriter_)
-            referenceYUV2GRAY<YUV2GRAY_Converter>(src, gold, yuvReader, grayWriter);
+            referenceYUV2GRAY<YUV2GRAY_Converter>(src, gold, cvt.yuvReader_, cvt.grayWriter_);
+        else if(cvt.yuvWriter_)
+            referenceRGB2YUV<RGB2YUV_Converter>  (src, gold, cvt.rgbReader_, cvt.yuvWriter_);
 
         cv::cvtColor(src, dst, code, -1);
 
@@ -429,40 +650,41 @@ TEST_P(Imgproc_ColorYUV, roi_accuracy)
     int code = GetParam();
     RNG& random = theRNG();
 
-    YUVreader* yuvReader = YUVreader::getReader(code);
+    ConversionYUV cvt(code);
-    RGBwriter* rgbWriter = RGBwriter::getWriter(code);
-    GRAYwriter* grayWriter = GRAYwriter::getWriter(code);
-
-    int dcn = (rgbWriter == 0) ? grayWriter->channels() : rgbWriter->channels();
 
+    const int scn = cvt.getScn();
+    const int dcn = cvt.getDcn();
     for(int iter = 0; iter < 30; ++iter)
     {
         Size sz(random.uniform(1, 641), random.uniform(1, 481));
 
-        if(yuvReader->requiresEvenWidth()) sz.width += sz.width % 2;
+        if(cvt.requiresEvenWidth())  sz.width  += sz.width % 2;
-        if(yuvReader->requiresEvenHeight()) sz.height += sz.height % 2;
+        if(cvt.requiresEvenHeight()) sz.height += sz.height % 2;
 
         int roi_offset_top = random.uniform(0, 6);
         int roi_offset_bottom = random.uniform(0, 6);
         int roi_offset_left = random.uniform(0, 6);
         int roi_offset_right = random.uniform(0, 6);
 
-        Size ysz = yuvReader->size(sz);
+        Size srcSize = cvt.getSrcSize(sz);
+        Mat src_full(srcSize.height + roi_offset_top + roi_offset_bottom, srcSize.width + roi_offset_left + roi_offset_right, CV_8UC(scn));
 
-        Mat src_full(ysz.height + roi_offset_top + roi_offset_bottom, ysz.width + roi_offset_left + roi_offset_right, CV_8UC(yuvReader->channels()));
+        Size dstSize = cvt.getDstSize(sz);
-        Mat dst_full(sz.height  + roi_offset_left + roi_offset_right, sz.width + roi_offset_top + roi_offset_bottom, CV_8UC(dcn), Scalar::all(0));
+        Mat dst_full(dstSize.height  + roi_offset_left + roi_offset_right, dstSize.width + roi_offset_top + roi_offset_bottom, CV_8UC(dcn), Scalar::all(0));
         Mat gold_full(dst_full.size(), CV_8UC(dcn), Scalar::all(0));
 
         random.fill(src_full, RNG::UNIFORM, 0, 256);
 
-        Mat src = src_full(Range(roi_offset_top, roi_offset_top + ysz.height), Range(roi_offset_left, roi_offset_left + ysz.width));
+        Mat src = src_full(Range(roi_offset_top, roi_offset_top + srcSize.height), Range(roi_offset_left, roi_offset_left + srcSize.width));
-        Mat dst = dst_full(Range(roi_offset_left, roi_offset_left + sz.height), Range(roi_offset_top, roi_offset_top + sz.width));
+        Mat dst = dst_full(Range(roi_offset_left, roi_offset_left + dstSize.height), Range(roi_offset_top, roi_offset_top + dstSize.width));
-        Mat gold = gold_full(Range(roi_offset_left, roi_offset_left + sz.height), Range(roi_offset_top, roi_offset_top + sz.width));
+        Mat gold = gold_full(Range(roi_offset_left, roi_offset_left + dstSize.height), Range(roi_offset_top, roi_offset_top + dstSize.width));
 
-        if(rgbWriter)
+        if(cvt.rgbWriter_)
-            referenceYUV2RGB<YUV2RGB_Converter>(src, gold, yuvReader, rgbWriter);
+            referenceYUV2RGB<YUV2RGB_Converter>  (src, gold, cvt.yuvReader_, cvt.rgbWriter_);
-        else
+        else if(cvt.grayWriter_)
-            referenceYUV2GRAY<YUV2GRAY_Converter>(src, gold, yuvReader, grayWriter);
+            referenceYUV2GRAY<YUV2GRAY_Converter>(src, gold, cvt.yuvReader_, cvt.grayWriter_);
+        else if(cvt.yuvWriter_)
+            referenceRGB2YUV<RGB2YUV_Converter>  (src, gold, cvt.rgbReader_, cvt.yuvWriter_);
 
         cv::cvtColor(src, dst, code, -1);
 
@@ -475,7 +697,9 @@ INSTANTIATE_TEST_CASE_P(cvt420, Imgproc_ColorYUV,
                       (int)CV_YUV2RGBA_NV12, (int)CV_YUV2BGRA_NV12, (int)CV_YUV2RGBA_NV21, (int)CV_YUV2BGRA_NV21,
                       (int)CV_YUV2RGB_YV12, (int)CV_YUV2BGR_YV12, (int)CV_YUV2RGB_IYUV, (int)CV_YUV2BGR_IYUV,
                       (int)CV_YUV2RGBA_YV12, (int)CV_YUV2BGRA_YV12, (int)CV_YUV2RGBA_IYUV, (int)CV_YUV2BGRA_IYUV,
-                      (int)CV_YUV2GRAY_420));
+                      (int)CV_YUV2GRAY_420, (int)CV_RGB2YUV_YV12, (int)CV_BGR2YUV_YV12, (int)CV_RGBA2YUV_YV12,
+                      (int)CV_BGRA2YUV_YV12, (int)CV_RGB2YUV_I420, (int)CV_BGR2YUV_I420, (int)CV_RGBA2YUV_I420,
+                      (int)CV_BGRA2YUV_I420));
 
 INSTANTIATE_TEST_CASE_P(cvt422, Imgproc_ColorYUV,
     ::testing::Values((int)CV_YUV2RGB_UYVY, (int)CV_YUV2BGR_UYVY, (int)CV_YUV2RGBA_UYVY, (int)CV_YUV2BGRA_UYVY,