added 3 channels support to cv::bilateralFilter

Conflicts:
	modules/imgproc/test/ocl/test_filters.cpp

modules/imgproc/src/opencl/bilateral.cl

@@ -32,6 +32,28 @@
 // or tort (including negligence or otherwise) arising in any way out of
 // the use of this software, even if advised of the possibility of such damage.
 
+#if cn != 3
+#define loadpix(addr) *(__global const uchar_t *)(addr)
+#define storepix(val, addr)  *(__global uchar_t *)(addr) = val
+#define TSIZE cn
+#else
+#define loadpix(addr) vload3(0, (__global const uchar *)(addr))
+#define storepix(val, addr) vstore3(val, 0, (__global uchar *)(addr))
+#define TSIZE 3
+#endif
+
+#if cn == 1
+#define SUM(a) a
+#elif cn == 2
+#define SUM(a) a.x + a.y
+#elif cn == 3
+#define SUM(a) a.x + a.y + a.z
+#elif cn == 4
+#define SUM(a) a.x + a.y + a.z + a.w
+#else
+#error "cn should be <= 4"
+#endif
+
 __kernel void bilateral(__global const uchar * src, int src_step, int src_offset,
                         __global uchar * dst, int dst_step, int dst_offset, int dst_rows, int dst_cols,
                         __constant float * color_weight, __constant float * space_weight, __constant int * space_ofs)
@@ -41,19 +63,23 @@ __kernel void bilateral(__global const uchar * src, int src_step, int src_offset
 
     if (y < dst_rows && x < dst_cols)
     {
-        int src_index = mad24(y + radius, src_step, x + radius + src_offset);
-        int dst_index = mad24(y, dst_step, x + dst_offset);
-        float sum = 0.f, wsum = 0.f;
-        int val0 = convert_int(src[src_index]);
+        int src_index = mad24(y + radius, src_step, mad24(x + radius, TSIZE, src_offset));
+        int dst_index = mad24(y, dst_step, mad24(x, TSIZE, dst_offset));
+
+        float_t sum = (float_t)(0.0f);
+        float wsum = 0.0f;
+        int_t val0 = convert_int_t(loadpix(src + src_index));
 
         #pragma unroll
         for (int k = 0; k < maxk; k++ )
         {
-            int val = convert_int(src[src_index + space_ofs[k]]);
-            float w = space_weight[k] * color_weight[abs(val - val0)];
-            sum += (float)(val) * w;
+            int_t val = convert_int_t(loadpix(src + src_index + space_ofs[k]));
+            uint_t diff = abs(val - val0);
+            float w = space_weight[k] * color_weight[SUM(diff)];
+            sum += convert_float_t(val) * (float_t)(w);
             wsum += w;
         }
-        dst[dst_index] = convert_uchar_rtz(sum / wsum + 0.5f);
+
+        storepix(convert_uchar_t(sum / (float_t)(wsum)), dst + dst_index);
     }
 }

modules/imgproc/src/smooth.cpp

@@ -2210,10 +2210,10 @@ static bool ocl_bilateralFilter_8u(InputArray _src, OutputArray _dst, int d,
                                    double sigma_color, double sigma_space,
                                    int borderType)
 {
-    int type = _src.type(), cn = CV_MAT_CN(type);
+    int type = _src.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
     int i, j, maxk, radius;
 
-    if ( type != CV_8UC1 )
+    if (depth != CV_8U || cn > 4)
         return false;
 
     if (sigma_color <= 0)
@@ -2240,9 +2240,9 @@ static bool ocl_bilateralFilter_8u(InputArray _src, OutputArray _dst, int d,
     std::vector<float> _color_weight(cn * 256);
     std::vector<float> _space_weight(d * d);
     std::vector<int> _space_ofs(d * d);
-    float *color_weight = &_color_weight[0];
-    float *space_weight = &_space_weight[0];
-    int *space_ofs = &_space_ofs[0];
+    float * const color_weight = &_color_weight[0];
+    float * const space_weight = &_space_weight[0];
+    int * const space_ofs = &_space_ofs[0];
 
     // initialize color-related bilateral filter coefficients
     for( i = 0; i < 256 * cn; i++ )
@@ -2256,11 +2256,19 @@ static bool ocl_bilateralFilter_8u(InputArray _src, OutputArray _dst, int d,
             if ( r > radius )
                 continue;
             space_weight[maxk] = (float)std::exp(r * r * gauss_space_coeff);
-            space_ofs[maxk++] = (int)(i * temp.step + j);
+            space_ofs[maxk++] = (int)(i * temp.step + j * cn);
         }
 
+    char cvt[3][40];
+    String cnstr = cn > 1 ? format("%d", cn) : "";
     ocl::Kernel k("bilateral", ocl::imgproc::bilateral_oclsrc,
-                  format("-D radius=%d -D maxk=%d", radius, maxk));
+                  format("-D radius=%d -D maxk=%d -D cn=%d -D int_t=%s -D uint_t=uint%s -D convert_int_t=%s"
+                         " -D uchar_t=%s -D float_t=%s -D convert_float_t=%s -D convert_uchar_t=%s",
+                         radius, maxk, cn, ocl::typeToStr(CV_32SC(cn)), cnstr.c_str(),
+                         ocl::convertTypeStr(CV_8U, CV_32S, cn, cvt[0]),
+                         ocl::typeToStr(type), ocl::typeToStr(CV_32FC(cn)),
+                         ocl::convertTypeStr(CV_32S, CV_32F, cn, cvt[1]),
+                         ocl::convertTypeStr(CV_32F, CV_8U, cn, cvt[2])));
     if (k.empty())
         return false;
 

modules/imgproc/test/ocl/test_filters.cpp

@@ -290,8 +290,6 @@ OCL_TEST_P(MorphologyEx, Mat)
     }
 }
 
-
-
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 #define FILTER_BORDER_SET_NO_ISOLATED \
@@ -309,7 +307,7 @@ OCL_TEST_P(MorphologyEx, Mat)
 #define FILTER_TYPES Values(CV_8UC1, CV_8UC3, CV_8UC4, CV_32FC1, CV_32FC3, CV_32FC4)
 
 OCL_INSTANTIATE_TEST_CASE_P(Filter, Bilateral, Combine(
-                            Values((MatType)CV_8UC1),
+                            Values(CV_8UC1, CV_8UC3),
                             Values(5, 9), // kernel size
                             Values(Size(0, 0)), // not used
                             FILTER_BORDER_SET_NO_ISOLATED,
@@ -372,7 +370,6 @@ OCL_INSTANTIATE_TEST_CASE_P(Filter, MorphologyEx, Combine(
                             Values(1.0, 2.0, 3.0),
                             Bool()));
 
-
 } } // namespace cvtest::ocl
 
 #endif // HAVE_OPENCL