Changed fastNlMeansDenoising and fastNlMeansDenoisingMulti back to sum of sq distances. Moved sq sum of abs distances to fastNlMeansDenoisingAbs and fastNlMeansDenoisingMultiAbs

modules/photo/include/opencv2/photo.hpp

@@ -138,6 +138,31 @@ parameter.
 CV_EXPORTS_W void fastNlMeansDenoising( InputArray src, OutputArray dst, float h = 3,
         int templateWindowSize = 7, int searchWindowSize = 21);
 
+/** @brief Perform image denoising using Non-local Means Denoising
+algorithm <http://www.ipol.im/pub/algo/bcm_non_local_means_denoising/>
+with several computational optimizations. Noise expected to be a
+gaussian white noise. Uses squared sum of absolute value distances
+instead of sum of squared distances for weight calculation
+
+@param src Input 8-bit or 16-bit 1-channel, 2-channel or 3-channel image.
+@param dst Output image with the same size and type as src .
+@param templateWindowSize Size in pixels of the template patch that is used to compute weights.
+Should be odd. Recommended value 7 pixels
+@param searchWindowSize Size in pixels of the window that is used to compute weighted average for
+given pixel. Should be odd. Affect performance linearly: greater searchWindowsSize - greater
+denoising time. Recommended value 21 pixels
+@param h Parameter regulating filter strength. Big h value perfectly removes noise but also
+removes image details, smaller h value preserves details but also preserves some noise
+
+This function expected to be applied to grayscale images. For colored images look at
+fastNlMeansDenoisingColored. Advanced usage of this functions can be manual denoising of colored
+image in different colorspaces. Such approach is used in fastNlMeansDenoisingColored by converting
+image to CIELAB colorspace and then separately denoise L and AB components with different h
+parameter.
+ */
+CV_EXPORTS_W void fastNlMeansDenoisingAbs( InputArray src, OutputArray dst, float h = 3,
+        int templateWindowSize = 7, int searchWindowSize = 21);
+
 /** @brief Modification of fastNlMeansDenoising function for colored images
 
 @param src Input 8-bit 3-channel image.
@@ -186,6 +211,37 @@ CV_EXPORTS_W void fastNlMeansDenoisingMulti( InputArrayOfArrays srcImgs, OutputA
         int imgToDenoiseIndex, int temporalWindowSize,
         float h = 3, int templateWindowSize = 7, int searchWindowSize = 21);
 
+/** @brief Modification of fastNlMeansDenoising function for images
+sequence where consequtive images have been captured in small period
+of time. For example video. This version of the function is for
+grayscale images or for manual manipulation with colorspaces. For more
+details see
+<http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.131.6394>. Uses
+squared sum of absolute value distances instead of sum of squared
+distances for weight calculation
+
+@param srcImgs Input 8-bit or 16-bit 1-channel, 2-channel or 3-channel
+images sequence. All images should
+have the same type and size.
+@param imgToDenoiseIndex Target image to denoise index in srcImgs sequence
+@param temporalWindowSize Number of surrounding images to use for target image denoising. Should
+be odd. Images from imgToDenoiseIndex - temporalWindowSize / 2 to
+imgToDenoiseIndex - temporalWindowSize / 2 from srcImgs will be used to denoise
+srcImgs[imgToDenoiseIndex] image.
+@param dst Output image with the same size and type as srcImgs images.
+@param templateWindowSize Size in pixels of the template patch that is used to compute weights.
+Should be odd. Recommended value 7 pixels
+@param searchWindowSize Size in pixels of the window that is used to compute weighted average for
+given pixel. Should be odd. Affect performance linearly: greater searchWindowsSize - greater
+denoising time. Recommended value 21 pixels
+@param h Parameter regulating filter strength for luminance component. Bigger h value perfectly
+removes noise but also removes image details, smaller h value preserves details but also preserves
+some noise
+ */
+CV_EXPORTS_W void fastNlMeansDenoisingMultiAbs( InputArrayOfArrays srcImgs, OutputArray dst,
+        int imgToDenoiseIndex, int temporalWindowSize,
+        float h = 3, int templateWindowSize = 7, int searchWindowSize = 21);
+
 /** @brief Modification of fastNlMeansDenoisingMulti function for colored images sequences
 
 @param srcImgs Input 8-bit 3-channel images sequence. All images should have the same type and

modules/photo/src/denoising.cpp

@@ -65,32 +65,62 @@ void cv::fastNlMeansDenoising( InputArray _src, OutputArray _dst, float h,
     switch (src.type()) {
         case CV_8U:
             parallel_for_(cv::Range(0, src.rows),
-                FastNlMeansDenoisingInvoker<uchar, int, unsigned>(
+                    FastNlMeansDenoisingInvoker<uchar, int, unsigned, DistSquared>(
                     src, dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_8UC2:
             parallel_for_(cv::Range(0, src.rows),
-                FastNlMeansDenoisingInvoker<cv::Vec2b, int, unsigned>(
+                    FastNlMeansDenoisingInvoker<cv::Vec2b, int, unsigned, DistSquared>(
                     src, dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_8UC3:
             parallel_for_(cv::Range(0, src.rows),
-                FastNlMeansDenoisingInvoker<cv::Vec3b, int, unsigned>(
+                    FastNlMeansDenoisingInvoker<cv::Vec3b, int, unsigned, DistSquared>(
+                    src, dst, templateWindowSize, searchWindowSize, h));
+            break;
+        default:
+            CV_Error(Error::StsBadArg,
+                "Unsupported image format! Only CV_8U, CV_8UC2, and CV_8UC3 are supported");
+    }
+}
+
+void cv::fastNlMeansDenoisingAbs( InputArray _src, OutputArray _dst, float h,
+                                  int  templateWindowSize, int searchWindowSize)
+{
+    Size src_size = _src.size();
+    Mat src = _src.getMat();
+    _dst.create(src_size, src.type());
+    Mat dst = _dst.getMat();
+
+    switch (src.type()) {
+        case CV_8U:
+            parallel_for_(cv::Range(0, src.rows),
+                FastNlMeansDenoisingInvoker<uchar, int, unsigned, DistAbs>(
+                    src, dst, templateWindowSize, searchWindowSize, h));
+            break;
+        case CV_8UC2:
+            parallel_for_(cv::Range(0, src.rows),
+                FastNlMeansDenoisingInvoker<cv::Vec2b, int, unsigned, DistAbs>(
+                    src, dst, templateWindowSize, searchWindowSize, h));
+            break;
+        case CV_8UC3:
+            parallel_for_(cv::Range(0, src.rows),
+                FastNlMeansDenoisingInvoker<cv::Vec3b, int, unsigned, DistAbs>(
                     src, dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_16U:
             parallel_for_(cv::Range(0, src.rows),
-                FastNlMeansDenoisingInvoker<ushort, int64, uint64>(
+                FastNlMeansDenoisingInvoker<ushort, int64, uint64, DistAbs>(
                     src, dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_16UC2:
             parallel_for_(cv::Range(0, src.rows),
-                FastNlMeansDenoisingInvoker<cv::Vec<ushort, 2>, int64, uint64>(
+                FastNlMeansDenoisingInvoker<cv::Vec<ushort, 2>, int64, uint64, DistAbs>(
                     src, dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_16UC3:
             parallel_for_(cv::Range(0, src.rows),
-                FastNlMeansDenoisingInvoker<cv::Vec<ushort, 3>, int64, uint64>(
+                FastNlMeansDenoisingInvoker<cv::Vec<ushort, 3>, int64, uint64, DistAbs>(
                     src, dst, templateWindowSize, searchWindowSize, h));
             break;
         default:
@@ -105,9 +135,9 @@ void cv::fastNlMeansDenoisingColored( InputArray _src, OutputArray _dst,
 {
     int type = _src.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
     Size src_size = _src.size();
-    if (type != CV_8UC3 && type != CV_16UC3 && type != CV_8UC4 && type != CV_16UC4)
+    if (type != CV_8UC3 && type != CV_8UC4)
     {
-        CV_Error(Error::StsBadArg, "Type of input image should be CV_8UC3, CV_16UC3, CV_8UC4, or CV_16UC4");
+        CV_Error(Error::StsBadArg, "Type of input image should be CV_8UC3 or CV_8UC4!");
         return;
     }
 
@@ -190,37 +220,77 @@ void cv::fastNlMeansDenoisingMulti( InputArrayOfArrays _srcImgs, OutputArray _ds
     {
         case CV_8U:
             parallel_for_(cv::Range(0, srcImgs[0].rows),
-                FastNlMeansMultiDenoisingInvoker<uchar, int, unsigned>(
+                FastNlMeansMultiDenoisingInvoker<uchar, int, unsigned, DistSquared>(
+                    srcImgs, imgToDenoiseIndex, temporalWindowSize,
+                    dst, templateWindowSize, searchWindowSize, h));
+            break;
+        case CV_8UC2:
+            parallel_for_(cv::Range(0, srcImgs[0].rows),
+                FastNlMeansMultiDenoisingInvoker<cv::Vec2b, int, unsigned, DistSquared>(
+                    srcImgs, imgToDenoiseIndex, temporalWindowSize,
+                    dst, templateWindowSize, searchWindowSize, h));
+            break;
+        case CV_8UC3:
+            parallel_for_(cv::Range(0, srcImgs[0].rows),
+                FastNlMeansMultiDenoisingInvoker<cv::Vec3b, int, unsigned, DistSquared>(
+                    srcImgs, imgToDenoiseIndex, temporalWindowSize,
+                    dst, templateWindowSize, searchWindowSize, h));
+            break;
+        default:
+            CV_Error(Error::StsBadArg,
+                "Unsupported image format! Only CV_8U, CV_8UC2, and CV_8UC3 are supported");
+    }
+}
+
+void cv::fastNlMeansDenoisingMultiAbs( InputArrayOfArrays _srcImgs, OutputArray _dst,
+                                       int imgToDenoiseIndex, int temporalWindowSize,
+                                       float h, int templateWindowSize, int searchWindowSize)
+{
+    std::vector<Mat> srcImgs;
+    _srcImgs.getMatVector(srcImgs);
+
+    fastNlMeansDenoisingMultiCheckPreconditions(
+        srcImgs, imgToDenoiseIndex,
+        temporalWindowSize, templateWindowSize, searchWindowSize);
+
+    _dst.create(srcImgs[0].size(), srcImgs[0].type());
+    Mat dst = _dst.getMat();
+
+    switch (srcImgs[0].type())
+    {
+        case CV_8U:
+            parallel_for_(cv::Range(0, srcImgs[0].rows),
+                FastNlMeansMultiDenoisingInvoker<uchar, int, unsigned, DistAbs>(
                     srcImgs, imgToDenoiseIndex, temporalWindowSize,
                     dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_8UC2:
             parallel_for_(cv::Range(0, srcImgs[0].rows),
-                FastNlMeansMultiDenoisingInvoker<cv::Vec2b, int, unsigned>(
+                FastNlMeansMultiDenoisingInvoker<cv::Vec2b, int, unsigned, DistAbs>(
                     srcImgs, imgToDenoiseIndex, temporalWindowSize,
                     dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_8UC3:
             parallel_for_(cv::Range(0, srcImgs[0].rows),
-                FastNlMeansMultiDenoisingInvoker<cv::Vec3b, int, unsigned>(
+                FastNlMeansMultiDenoisingInvoker<cv::Vec3b, int, unsigned, DistAbs>(
                     srcImgs, imgToDenoiseIndex, temporalWindowSize,
                     dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_16U:
             parallel_for_(cv::Range(0, srcImgs[0].rows),
-                FastNlMeansMultiDenoisingInvoker<ushort, int64, uint64>(
+                FastNlMeansMultiDenoisingInvoker<ushort, int64, uint64, DistAbs>(
                     srcImgs, imgToDenoiseIndex, temporalWindowSize,
                     dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_16UC2:
             parallel_for_(cv::Range(0, srcImgs[0].rows),
-                FastNlMeansMultiDenoisingInvoker<cv::Vec<ushort, 2>, int64, uint64>(
+                FastNlMeansMultiDenoisingInvoker<cv::Vec<ushort, 2>, int64, uint64, DistAbs>(
                     srcImgs, imgToDenoiseIndex, temporalWindowSize,
                     dst, templateWindowSize, searchWindowSize, h));
             break;
         case CV_16UC3:
             parallel_for_(cv::Range(0, srcImgs[0].rows),
-                FastNlMeansMultiDenoisingInvoker<cv::Vec<ushort, 3>, int64, uint64>(
+                FastNlMeansMultiDenoisingInvoker<cv::Vec<ushort, 3>, int64, uint64, DistAbs>(
                     srcImgs, imgToDenoiseIndex, temporalWindowSize,
                     dst, templateWindowSize, searchWindowSize, h));
             break;
@@ -248,9 +318,9 @@ void cv::fastNlMeansDenoisingColoredMulti( InputArrayOfArrays _srcImgs, OutputAr
     int type = srcImgs[0].type(), depth = CV_MAT_DEPTH(type);
     int src_imgs_size = static_cast<int>(srcImgs.size());
 
-    if (type != CV_8UC3 && type != CV_16UC3)
+    if (type != CV_8UC3)
     {
-        CV_Error(Error::StsBadArg, "Type of input images should be CV_8UC3 or CV_16UC3!");
+        CV_Error(Error::StsBadArg, "Type of input images should be CV_8UC3!");
         return;
     }
 

modules/photo/src/fast_nlmeans_denoising_invoker.hpp

@@ -50,7 +50,7 @@
 
 using namespace cv;
 
-template <typename T, typename IT, typename UIT>
+template <typename T, typename IT, typename UIT, typename D>
 struct FastNlMeansDenoisingInvoker :
         public ParallelLoopBody
 {
@@ -99,8 +99,8 @@ inline int getNearestPowerOf2(int value)
     return p;
 }
 
-template <class T, typename IT, typename UIT>
-FastNlMeansDenoisingInvoker<T, IT, UIT>::FastNlMeansDenoisingInvoker(
+template <typename T, typename IT, typename UIT, typename D>
+FastNlMeansDenoisingInvoker<T, IT, UIT, D>::FastNlMeansDenoisingInvoker(
     const Mat& src, Mat& dst,
     int template_window_size,
     int search_window_size,
@@ -128,7 +128,7 @@ FastNlMeansDenoisingInvoker<T, IT, UIT>::FastNlMeansDenoisingInvoker(
     almost_template_window_size_sq_bin_shift_ = getNearestPowerOf2(template_window_size_sq);
     double almost_dist2actual_dist_multiplier = ((double)(1 << almost_template_window_size_sq_bin_shift_)) / template_window_size_sq;
 
-    IT max_dist = (IT)pixelInfo<T>::sampleMax() * (IT)pixelInfo<T>::channels;
+    IT max_dist = D::template maxDist<T, IT>();
     size_t almost_max_dist = (size_t)(max_dist / almost_dist2actual_dist_multiplier + 1);
     almost_dist2weight_.resize(almost_max_dist);
 
@@ -136,7 +136,7 @@ FastNlMeansDenoisingInvoker<T, IT, UIT>::FastNlMeansDenoisingInvoker(
     for (int almost_dist = 0; almost_dist < almost_max_dist; almost_dist++)
     {
         double dist = almost_dist * almost_dist2actual_dist_multiplier;
-        IT weight = (IT)round(fixed_point_mult_ * std::exp(-dist*dist / (h * h * pixelInfo<T>::channels)));
+        IT weight = (IT)round(fixed_point_mult_ * D::template calcWeight<T>(dist, h));
         if (weight < WEIGHT_THRESHOLD * fixed_point_mult_)
             weight = 0;
 
@@ -149,8 +149,8 @@ FastNlMeansDenoisingInvoker<T, IT, UIT>::FastNlMeansDenoisingInvoker(
         dst_ = Mat::zeros(src_.size(), src_.type());
 }
 
-template <class T, typename IT, typename UIT>
-void FastNlMeansDenoisingInvoker<T, IT, UIT>::operator() (const Range& range) const
+template <typename T, typename IT, typename UIT, typename D>
+void FastNlMeansDenoisingInvoker<T, IT, UIT, D>::operator() (const Range& range) const
 {
     int row_from = range.start;
     int row_to = range.end - 1;
@@ -215,7 +215,7 @@ void FastNlMeansDenoisingInvoker<T, IT, UIT>::operator() (const Range& range) co
                             dist_sums_row[x] -= col_dist_sums_row[x];
 
                             int bx = start_bx + x;
-                            col_dist_sums_row[x] = up_col_dist_sums_row[x] + calcUpDownDist<T, IT>(a_up, a_down, b_up_ptr[bx], b_down_ptr[bx]);
+                            col_dist_sums_row[x] = up_col_dist_sums_row[x] + D::template calcUpDownDist<T, IT>(a_up, a_down, b_up_ptr[bx], b_down_ptr[bx]);
 
                             dist_sums_row[x] += col_dist_sums_row[x];
                             up_col_dist_sums_row[x] = col_dist_sums_row[x];
@@ -254,8 +254,8 @@ void FastNlMeansDenoisingInvoker<T, IT, UIT>::operator() (const Range& range) co
     }
 }
 
-template <class T, typename IT, typename UIT>
-inline void FastNlMeansDenoisingInvoker<T, IT, UIT>::calcDistSumsForFirstElementInRow(
+template <typename T, typename IT, typename UIT, typename D>
+inline void FastNlMeansDenoisingInvoker<T, IT, UIT, D>::calcDistSumsForFirstElementInRow(
     int i,
     Array2d<IT>& dist_sums,
     Array3d<IT>& col_dist_sums,
@@ -276,7 +276,7 @@ inline void FastNlMeansDenoisingInvoker<T, IT, UIT>::calcDistSumsForFirstElement
             for (int ty = -template_window_half_size_; ty <= template_window_half_size_; ty++)
                 for (int tx = -template_window_half_size_; tx <= template_window_half_size_; tx++)
                 {
-                    int dist = calcDist<T, IT>(extended_src_,
+                    int dist = D::template calcDist<T, IT>(extended_src_,
                         border_size_ + i + ty, border_size_ + j + tx,
                         border_size_ + start_y + ty, border_size_ + start_x + tx);
 
@@ -288,8 +288,8 @@ inline void FastNlMeansDenoisingInvoker<T, IT, UIT>::calcDistSumsForFirstElement
         }
 }
 
-template <class T, typename IT, typename UIT>
-inline void FastNlMeansDenoisingInvoker<T, IT, UIT>::calcDistSumsForElementInFirstRow(
+template <typename T, typename IT, typename UIT, typename D>
+inline void FastNlMeansDenoisingInvoker<T, IT, UIT, D>::calcDistSumsForElementInFirstRow(
     int i, int j, int first_col_num,
     Array2d<IT>& dist_sums,
     Array3d<IT>& col_dist_sums,
@@ -312,7 +312,7 @@ inline void FastNlMeansDenoisingInvoker<T, IT, UIT>::calcDistSumsForElementInFir
             int by = start_by + y;
             int bx = start_bx + x;
             for (int ty = -template_window_half_size_; ty <= template_window_half_size_; ty++)
-                col_dist_sums[new_last_col_num][y][x] += calcDist<T,IT>(extended_src_, ay + ty, ax, by + ty, bx);
+                col_dist_sums[new_last_col_num][y][x] += D::template calcDist<T,IT>(extended_src_, ay + ty, ax, by + ty, bx);
 
             dist_sums[y][x] += col_dist_sums[new_last_col_num][y][x];
             up_col_dist_sums[j][y][x] = col_dist_sums[new_last_col_num][y][x];

modules/photo/src/fast_nlmeans_denoising_invoker_commons.hpp

@@ -81,47 +81,150 @@ template <typename T> struct pixelInfo: public pixelInfo_<T>
     }
 };
 
-template <typename T, typename IT> struct calcDist_
+class DistAbs
 {
-    static inline IT f(const T a, const T b)
+    template <typename T, typename IT> struct calcDist_
     {
-        return std::abs((IT)(a-b));
+        static inline IT f(const T a, const T b)
+        {
+            return std::abs((IT)(a-b));
+        }
+    };
+
+    template <typename ET, typename IT> struct calcDist_<Vec<ET, 2>, IT>
+    {
+        static inline IT f(const Vec<ET, 2> a, const Vec<ET, 2> b)
+        {
+            return std::abs((IT)(a[0]-b[0])) + std::abs((IT)(a[1]-b[1]));
+        }
+    };
+
+    template <typename ET, typename IT> struct calcDist_<Vec<ET, 3>, IT>
+    {
+        static inline IT f(const Vec<ET, 3> a, const Vec<ET, 3> b)
+        {
+            return
+                std::abs((IT)(a[0]-b[0])) +
+                std::abs((IT)(a[1]-b[1])) +
+                std::abs((IT)(a[2]-b[2]));
+        }
+    };
+
+public:
+    template <typename T, typename IT> static inline IT calcDist(const T a, const T b)
+    {
+        return calcDist_<T, IT>::f(a, b);
     }
-};
 
-template <typename ET, typename IT> struct calcDist_<Vec<ET, 2>, IT>
-{
-    static inline IT f(const Vec<ET, 2> a, const Vec<ET, 2> b)
+    template <typename T, typename IT>
+    static inline IT calcDist(const Mat& m, int i1, int j1, int i2, int j2)
     {
-        return std::abs((IT)(a[0]-b[0])) + std::abs((IT)(a[1]-b[1]));
+        const T a = m.at<T>(i1, j1);
+        const T b = m.at<T>(i2, j2);
+        return calcDist<T, IT>(a,b);
     }
-};
 
-template <typename ET, typename IT> struct calcDist_<Vec<ET, 3>, IT>
-{
-    static inline IT f(const Vec<ET, 3> a, const Vec<ET, 3> b)
+    template <typename T, typename IT>
+    static inline IT calcUpDownDist(T a_up, T a_down, T b_up, T b_down)
     {
-        return std::abs((IT)(a[0]-b[0])) + std::abs((IT)(a[1]-b[1])) + std::abs((IT)(a[2]-b[2]));
+        return calcDist<T, IT>(a_down, b_down) - calcDist<T, IT>(a_up, b_up);
+    };
+
+    template <typename T>
+    static double calcWeight(double dist, double h)
+    {
+        return std::exp(-dist*dist / (h * h * pixelInfo<T>::channels));
+    }
+
+    template <typename T, typename IT>
+    static double maxDist()
+    {
+        return (IT)pixelInfo<T>::sampleMax() * (IT)pixelInfo<T>::channels;
     }
 };
 
-template <typename T, typename IT> static inline IT calcDist(const T a, const T b)
+class DistSquared
 {
-    return calcDist_<T, IT>::f(a, b);
-}
+    template <typename T, typename IT> struct calcDist_
+    {
+        static inline IT f(const T a, const T b)
+        {
+            return (IT)(a-b) * (IT)(a-b);
+        }
+    };
 
-template <typename T, typename IT>
-static inline IT calcDist(const Mat& m, int i1, int j1, int i2, int j2)
-{
-    const T a = m.at<T>(i1, j1);
-    const T b = m.at<T>(i2, j2);
-    return calcDist<T, IT>(a,b);
-}
+    template <typename ET, typename IT> struct calcDist_<Vec<ET, 2>, IT>
+    {
+        static inline IT f(const Vec<ET, 2> a, const Vec<ET, 2> b)
+        {
+            return (IT)(a[0]-b[0])*(IT)(a[0]-b[0]) + (IT)(a[1]-b[1])*(IT)(a[1]-b[1]);
+        }
+    };
 
-template <typename T, typename IT>
-static inline IT calcUpDownDist(T a_up, T a_down, T b_up, T b_down)
-{
-    return calcDist<T, IT>(a_down, b_down) - calcDist<T, IT>(a_up, b_up);
+    template <typename ET, typename IT> struct calcDist_<Vec<ET, 3>, IT>
+    {
+        static inline IT f(const Vec<ET, 3> a, const Vec<ET, 3> b)
+        {
+            return
+                (IT)(a[0]-b[0])*(IT)(a[0]-b[0]) +
+                (IT)(a[1]-b[1])*(IT)(a[1]-b[1]) +
+                (IT)(a[2]-b[2])*(IT)(a[2]-b[2]);
+        }
+    };
+
+    template <typename T, typename IT> struct calcUpDownDist_
+    {
+        static inline IT f(T a_up, T a_down, T b_up, T b_down)
+        {
+            IT A = a_down - b_down;
+            IT B = a_up - b_up;
+            return (A-B)*(A+B);
+        }
+    };
+
+    template <typename ET, int n, typename IT> struct calcUpDownDist_<Vec<ET, n>, IT>
+    {
+    private:
+        typedef Vec<ET, n> T;
+    public:
+        static inline IT f(T a_up, T a_down, T b_up, T b_down)
+        {
+            return calcDist<T, IT>(a_down, b_down) - calcDist<T, IT>(a_up, b_up);
+        }
+    };
+
+public:
+    template <typename T, typename IT> static inline IT calcDist(const T a, const T b)
+    {
+        return calcDist_<T, IT>::f(a, b);
+    }
+
+    template <typename T, typename IT>
+    static inline IT calcDist(const Mat& m, int i1, int j1, int i2, int j2)
+    {
+        const T a = m.at<T>(i1, j1);
+        const T b = m.at<T>(i2, j2);
+        return calcDist<T, IT>(a,b);
+    }
+
+    template <typename T, typename IT>
+    static inline IT calcUpDownDist(T a_up, T a_down, T b_up, T b_down)
+    {
+        return calcUpDownDist_<T, IT>::f(a_up, a_down, b_up, b_down);
+    };
+
+    template <typename T>
+    static double calcWeight(double dist, double h)
+    {
+        return std::exp(-dist / (h * h * pixelInfo<T>::channels));
+    }
+
+    template <typename T, typename IT>
+    static double maxDist()
+    {
+        return (IT)pixelInfo<T>::sampleMax() * (IT)pixelInfo<T>::sampleMax() *
+            (IT)pixelInfo<T>::channels;
+    }
 };
 
 template <typename T, typename IT> struct incWithWeight_

modules/photo/src/fast_nlmeans_multi_denoising_invoker.hpp

@@ -50,7 +50,7 @@
 
 using namespace cv;
 
-template <typename T, typename IT, typename UIT>
+template <typename T, typename IT, typename UIT, typename D>
 struct FastNlMeansMultiDenoisingInvoker :
         ParallelLoopBody
 {
@@ -94,8 +94,8 @@ private:
                                           Array4d<IT>& up_col_dist_sums) const;
 };
 
-template <class T, typename IT, typename UIT>
-FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::FastNlMeansMultiDenoisingInvoker(
+template <typename T, typename IT, typename UIT, typename D>
+FastNlMeansMultiDenoisingInvoker<T, IT, UIT, D>::FastNlMeansMultiDenoisingInvoker(
     const std::vector<Mat>& srcImgs,
     int imgToDenoiseIndex,
     int temporalWindowSize,
@@ -139,7 +139,7 @@ FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::FastNlMeansMultiDenoisingInvoker(
     int almost_template_window_size_sq = 1 << almost_template_window_size_sq_bin_shift;
     double almost_dist2actual_dist_multiplier = (double) almost_template_window_size_sq / template_window_size_sq;
 
-    IT max_dist = (IT)pixelInfo<T>::sampleMax() * (IT)pixelInfo<T>::channels;
+    IT max_dist = D::template maxDist<T,IT>();
     int almost_max_dist = (int) (max_dist / almost_dist2actual_dist_multiplier + 1);
     almost_dist2weight.resize(almost_max_dist);
 
@@ -147,7 +147,7 @@ FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::FastNlMeansMultiDenoisingInvoker(
     for (int almost_dist = 0; almost_dist < almost_max_dist; almost_dist++)
     {
         double dist = almost_dist * almost_dist2actual_dist_multiplier;
-        IT weight = (IT)round(fixed_point_mult_ * std::exp(-dist*dist / (h * h * pixelInfo<T>::channels)));
+        IT weight = (IT)round(fixed_point_mult_ * D::template calcWeight<T>(dist, h));
         if (weight < WEIGHT_THRESHOLD * fixed_point_mult_)
             weight = 0;
 
@@ -160,8 +160,8 @@ FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::FastNlMeansMultiDenoisingInvoker(
         dst_ = Mat::zeros(srcImgs[0].size(), srcImgs[0].type());
 }
 
-template <class T, typename IT, typename UIT>
-void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::operator() (const Range& range) const
+template <typename T, typename IT, typename UIT, typename D>
+void FastNlMeansMultiDenoisingInvoker<T, IT, UIT, D>::operator() (const Range& range) const
 {
     int row_from = range.start;
     int row_to = range.end - 1;
@@ -234,7 +234,7 @@ void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::operator() (const Range& rang
                                 dist_sums_row[x] -= col_dist_sums_row[x];
 
                                 col_dist_sums_row[x] = up_col_dist_sums_row[x] +
-                                    calcUpDownDist<T, IT>(a_up, a_down, b_up_ptr[start_bx + x], b_down_ptr[start_bx + x]);
+                                    D::template calcUpDownDist<T, IT>(a_up, a_down, b_up_ptr[start_bx + x], b_down_ptr[start_bx + x]);
 
                                 dist_sums_row[x] += col_dist_sums_row[x];
                                 up_col_dist_sums_row[x] = col_dist_sums_row[x];
@@ -284,8 +284,8 @@ void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::operator() (const Range& rang
     }
 }
 
-template <class T, typename IT, typename UIT>
-inline void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::calcDistSumsForFirstElementInRow(
+template <typename T, typename IT, typename UIT, typename D>
+inline void FastNlMeansMultiDenoisingInvoker<T, IT, UIT, D>::calcDistSumsForFirstElementInRow(
         int i, Array3d<IT>& dist_sums, Array4d<IT>& col_dist_sums, Array4d<IT>& up_col_dist_sums) const
 {
     int j = 0;
@@ -310,7 +310,7 @@ inline void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::calcDistSumsForFirstEl
                 {
                     for (int ty = -template_window_half_size_; ty <= template_window_half_size_; ty++)
                     {
-                        IT dist = calcDist<T, IT>(
+                        IT dist = D::template calcDist<T, IT>(
                                     main_extended_src_.at<T>(border_size_ + i + ty, border_size_ + j + tx),
                                     cur_extended_src.at<T>(border_size_ + start_y + ty, border_size_ + start_x + tx));
 
@@ -325,8 +325,8 @@ inline void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::calcDistSumsForFirstEl
     }
 }
 
-template <class T, typename IT, typename UIT>
-inline void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::calcDistSumsForElementInFirstRow(
+template <typename T, typename IT, typename UIT, typename D>
+inline void FastNlMeansMultiDenoisingInvoker<T, IT, UIT, D>::calcDistSumsForElementInFirstRow(
     int i, int j, int first_col_num, Array3d<IT>& dist_sums,
     Array4d<IT>& col_dist_sums, Array4d<IT>& up_col_dist_sums) const
 {
@@ -353,7 +353,7 @@ inline void FastNlMeansMultiDenoisingInvoker<T, IT, UIT>::calcDistSumsForElement
                 IT* col_dist_sums_ptr = &col_dist_sums[new_last_col_num][d][y][x];
                 for (int ty = -template_window_half_size_; ty <= template_window_half_size_; ty++)
                 {
-                    *col_dist_sums_ptr += calcDist<T, IT>(
+                    *col_dist_sums_ptr += D::template calcDist<T, IT>(
                                 main_extended_src_.at<T>(ay + ty, ax),
                                 cur_extended_src.at<T>(by + ty, bx));
                 }