refactored gpu::ImagePyramid (converted it to abstract interface)

modules/gpuwarping/include/opencv2/gpuwarping.hpp

@@ -100,32 +100,14 @@ CV_EXPORTS void pyrDown(InputArray src, OutputArray dst, Stream& stream = Stream
 //! upsamples the source image and then smoothes it
 CV_EXPORTS void pyrUp(InputArray src, OutputArray dst, Stream& stream = Stream::Null());
 
-class CV_EXPORTS ImagePyramid
+class CV_EXPORTS ImagePyramid : public Algorithm
 {
 public:
-    inline ImagePyramid() : nLayers_(0) {}
+    virtual void getLayer(OutputArray outImg, Size outRoi, Stream& stream = Stream::Null()) const = 0;
-    inline ImagePyramid(const GpuMat& img, int nLayers, Stream& stream = Stream::Null())
-    {
-        build(img, nLayers, stream);
-    }
-
-    void build(const GpuMat& img, int nLayers, Stream& stream = Stream::Null());
-
-    void getLayer(GpuMat& outImg, Size outRoi, Stream& stream = Stream::Null()) const;
-
-    inline void release()
-    {
-        layer0_.release();
-        pyramid_.clear();
-        nLayers_ = 0;
-    }
-
-private:
-    GpuMat layer0_;
-    std::vector<GpuMat> pyramid_;
-    int nLayers_;
 };
 
+CV_EXPORTS Ptr<ImagePyramid> createImagePyramid(InputArray img, int nLayers = -1, Stream& stream = Stream::Null());
+
 }} // namespace cv { namespace gpu {
 
 #endif /* __OPENCV_GPUWARPING_HPP__ */

modules/gpuwarping/perf/perf_warping.cpp

@@ -515,45 +515,6 @@ PERF_TEST_P(Sz_Depth_Cn, PyrUp,
     }
 }
 
-//////////////////////////////////////////////////////////////////////
-// ImagePyramidBuild
-
-PERF_TEST_P(Sz_Depth_Cn, ImagePyramidBuild,
-            Combine(GPU_TYPICAL_MAT_SIZES,
-                    Values(CV_8U, CV_16U, CV_32F),
-                    GPU_CHANNELS_1_3_4))
-{
-    const cv::Size size = GET_PARAM(0);
-    const int depth = GET_PARAM(1);
-    const int channels = GET_PARAM(2);
-
-    const int type = CV_MAKE_TYPE(depth, channels);
-
-    cv::Mat src(size, type);
-    declare.in(src, WARMUP_RNG);
-
-    const int nLayers = 5;
-    const cv::Size dstSize(size.width / 2 + 10, size.height / 2 + 10);
-
-    if (PERF_RUN_GPU())
-    {
-        const cv::gpu::GpuMat d_src(src);
-
-        cv::gpu::ImagePyramid d_pyr;
-
-        TEST_CYCLE() d_pyr.build(d_src, nLayers);
-
-        cv::gpu::GpuMat dst;
-        d_pyr.getLayer(dst, dstSize);
-
-        GPU_SANITY_CHECK(dst);
-    }
-    else
-    {
-        FAIL_NO_CPU();
-    }
-}
-
 //////////////////////////////////////////////////////////////////////
 // ImagePyramidGetLayer
 
@@ -579,9 +540,9 @@ PERF_TEST_P(Sz_Depth_Cn, ImagePyramidGetLayer,
         const cv::gpu::GpuMat d_src(src);
         cv::gpu::GpuMat dst;
 
-        cv::gpu::ImagePyramid d_pyr(d_src, nLayers);
+        cv::Ptr<cv::gpu::ImagePyramid> d_pyr = cv::gpu::createImagePyramid(d_src, nLayers);
 
-        TEST_CYCLE() d_pyr.getLayer(dst, dstSize);
+        TEST_CYCLE() d_pyr->getLayer(dst, dstSize);
 
         GPU_SANITY_CHECK(dst);
     }

modules/gpuwarping/src/pyramids.cpp

@@ -42,13 +42,15 @@
 
 #include "precomp.hpp"
 
+using namespace cv;
+using namespace cv::gpu;
+
 #if !defined HAVE_CUDA || defined(CUDA_DISABLER)
 
 void cv::gpu::pyrDown(InputArray, OutputArray, Stream&) { throw_no_cuda(); }
 void cv::gpu::pyrUp(InputArray, OutputArray, Stream&) { throw_no_cuda(); }
 
-void cv::gpu::ImagePyramid::build(const GpuMat&, int, Stream&) { throw_no_cuda(); }
+Ptr<ImagePyramid> cv::gpu::createImagePyramid(InputArray, int, Stream&) { throw_no_cuda(); return Ptr<ImagePyramid>(); }
-void cv::gpu::ImagePyramid::getLayer(GpuMat&, Size, Stream&) const { throw_no_cuda(); }
 
 #else // HAVE_CUDA
 
@@ -134,84 +136,108 @@ void cv::gpu::pyrUp(InputArray _src, OutputArray _dst, Stream& stream)
 //////////////////////////////////////////////////////////////////////////////
 // ImagePyramid
 
-void cv::gpu::ImagePyramid::build(const GpuMat& img, int numLayers, Stream& stream)
+#ifdef HAVE_OPENCV_GPULEGACY
+
+namespace
+{
+    class ImagePyramidImpl : public ImagePyramid
+    {
+    public:
+        ImagePyramidImpl(InputArray img, int nLayers, Stream& stream);
+
+        void getLayer(OutputArray outImg, Size outRoi, Stream& stream = Stream::Null()) const;
+
+    private:
+        GpuMat layer0_;
+        std::vector<GpuMat> pyramid_;
+        int nLayers_;
+    };
+
+    ImagePyramidImpl::ImagePyramidImpl(InputArray _img, int numLayers, Stream& stream)
+    {
+        GpuMat img = _img.getGpuMat();
+
+        CV_Assert( img.depth() <= CV_32F && img.channels() <= 4 );
+
+        img.copyTo(layer0_, stream);
+
+        Size szLastLayer = img.size();
+        nLayers_ = 1;
+
+        if (numLayers <= 0)
+            numLayers = 255; // it will cut-off when any of the dimensions goes 1
+
+        pyramid_.resize(numLayers);
+
+        for (int i = 0; i < numLayers - 1; ++i)
+        {
+            Size szCurLayer(szLastLayer.width / 2, szLastLayer.height / 2);
+
+            if (szCurLayer.width == 0 || szCurLayer.height == 0)
+                break;
+
+            ensureSizeIsEnough(szCurLayer, img.type(), pyramid_[i]);
+            nLayers_++;
+
+            const GpuMat& prevLayer = i == 0 ? layer0_ : pyramid_[i - 1];
+
+            cudev::pyramid::downsampleX2(prevLayer, pyramid_[i], img.depth(), img.channels(), StreamAccessor::getStream(stream));
+
+            szLastLayer = szCurLayer;
+        }
+    }
+
+    void ImagePyramidImpl::getLayer(OutputArray _outImg, Size outRoi, Stream& stream) const
+    {
+        CV_Assert( outRoi.width <= layer0_.cols && outRoi.height <= layer0_.rows && outRoi.width > 0 && outRoi.height > 0 );
+
+        ensureSizeIsEnough(outRoi, layer0_.type(), _outImg);
+        GpuMat outImg = _outImg.getGpuMat();
+
+        if (outRoi.width == layer0_.cols && outRoi.height == layer0_.rows)
+        {
+            layer0_.copyTo(outImg, stream);
+            return;
+        }
+
+        float lastScale = 1.0f;
+        float curScale;
+        GpuMat lastLayer = layer0_;
+        GpuMat curLayer;
+
+        for (int i = 0; i < nLayers_ - 1; ++i)
+        {
+            curScale = lastScale * 0.5f;
+            curLayer = pyramid_[i];
+
+            if (outRoi.width == curLayer.cols && outRoi.height == curLayer.rows)
+            {
+                curLayer.copyTo(outImg, stream);
+            }
+
+            if (outRoi.width >= curLayer.cols && outRoi.height >= curLayer.rows)
+                break;
+
+            lastScale = curScale;
+            lastLayer = curLayer;
+        }
+
+        cudev::pyramid::interpolateFrom1(lastLayer, outImg, outImg.depth(), outImg.channels(), StreamAccessor::getStream(stream));
+    }
+}
+
+#endif
+
+Ptr<ImagePyramid> cv::gpu::createImagePyramid(InputArray img, int nLayers, Stream& stream)
 {
 #ifndef HAVE_OPENCV_GPULEGACY
     (void) img;
     (void) numLayers;
     (void) stream;
     throw_no_cuda();
+    return Ptr<ImagePyramid>();
 #else
-    CV_Assert(img.depth() <= CV_32F && img.channels() <= 4);
+    return new ImagePyramidImpl(img, nLayers, stream);
-
-    layer0_ = img;
-    Size szLastLayer = img.size();
-    nLayers_ = 1;
-
-    if (numLayers <= 0)
-        numLayers = 255; //it will cut-off when any of the dimensions goes 1
-
-    pyramid_.resize(numLayers);
-
-    for (int i = 0; i < numLayers - 1; ++i)
-    {
-        Size szCurLayer(szLastLayer.width / 2, szLastLayer.height / 2);
-
-        if (szCurLayer.width == 0 || szCurLayer.height == 0)
-            break;
-
-        ensureSizeIsEnough(szCurLayer, img.type(), pyramid_[i]);
-        nLayers_++;
-
-        const GpuMat& prevLayer = i == 0 ? layer0_ : pyramid_[i - 1];
-
-        cudev::pyramid::downsampleX2(prevLayer, pyramid_[i], img.depth(), img.channels(), StreamAccessor::getStream(stream));
-
-        szLastLayer = szCurLayer;
-    }
-#endif
-}
-
-void cv::gpu::ImagePyramid::getLayer(GpuMat& outImg, Size outRoi, Stream& stream) const
-{
-#ifndef HAVE_OPENCV_GPULEGACY
-    (void) outImg;
-    (void) outRoi;
-    (void) stream;
-    throw_no_cuda();
-#else
-    CV_Assert(outRoi.width <= layer0_.cols && outRoi.height <= layer0_.rows && outRoi.width > 0 && outRoi.height > 0);
-
-    ensureSizeIsEnough(outRoi, layer0_.type(), outImg);
-
-    if (outRoi.width == layer0_.cols && outRoi.height == layer0_.rows)
-    {
-        layer0_.copyTo(outImg, stream);
-    }
-
-    float lastScale = 1.0f;
-    float curScale;
-    GpuMat lastLayer = layer0_;
-    GpuMat curLayer;
-
-    for (int i = 0; i < nLayers_ - 1; ++i)
-    {
-        curScale = lastScale * 0.5f;
-        curLayer = pyramid_[i];
-
-        if (outRoi.width == curLayer.cols && outRoi.height == curLayer.rows)
-        {
-            curLayer.copyTo(outImg, stream);
-        }
-
-        if (outRoi.width >= curLayer.cols && outRoi.height >= curLayer.rows)
-            break;
-
-        lastScale = curScale;
-        lastLayer = curLayer;
-    }
-
-    cudev::pyramid::interpolateFrom1(lastLayer, outImg, outImg.depth(), outImg.channels(), StreamAccessor::getStream(stream));
 #endif
 }