Removed useless multiplication by 4

modules/imgproc/src/opencl/pyr_up.cl

@@ -72,9 +72,106 @@
 
 #define noconvert
 
-
 __kernel void pyrUp(__global const uchar * src, int src_step, int src_offset, int src_rows, int src_cols,
                          __global uchar * dst, int dst_step, int dst_offset, int dst_rows, int dst_cols)
+{
+    const int x = get_global_id(0);
+    const int y = get_global_id(1);
+
+    const int lsizex = get_local_size(0);
+    const int lsizey = get_local_size(1);
+
+    const int tidx = get_local_id(0);
+    const int tidy = get_local_id(1);
+
+    __local FT s_srcPatch[10][10];
+    __local FT s_dstPatch[20][16];
+
+    __global uchar * dstData = dst + dst_offset;
+    __global const uchar * srcData = src + src_offset;
+
+    if( tidx < 10 && tidy < 10 )
+    {
+        int srcx = mad24((int)get_group_id(0), lsizex>>1, tidx) - 1;
+        int srcy = mad24((int)get_group_id(1), lsizey>>1, tidy) - 1;
+
+        srcx = abs(srcx);
+        srcx = min(src_cols - 1, srcx);
+
+        srcy = abs(srcy);
+        srcy = min(src_rows - 1, srcy);
+
+        s_srcPatch[tidy][tidx] = convertToFT(loadpix(srcData + srcy * src_step + srcx * PIXSIZE));
+    }
+
+    barrier(CLK_LOCAL_MEM_FENCE);
+
+    FT sum = 0.f;
+    const FT evenFlag = (FT)((tidx & 1) == 0);
+    const FT  oddFlag = (FT)((tidx & 1) != 0);
+    const bool  eveny = ((tidy & 1) == 0);
+
+    const FT co1 = 0.75f;
+    const FT co2 = 0.5f;
+    const FT co3 = 0.125f;
+
+    if(eveny)
+    {
+        sum =       ( evenFlag* co3 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx - 2) >> 1)];
+        sum = sum + ( oddFlag * co2 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx - 1) >> 1)];
+        sum = sum + ( evenFlag* co1 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx    ) >> 1)];
+        sum = sum + ( oddFlag * co2 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx + 1) >> 1)];
+        sum = sum + ( evenFlag* co3 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx + 2) >> 1)];
+    }
+
+    s_dstPatch[2 + tidy][tidx] = sum;
+
+    if (tidy < 2)
+    {
+        sum = 0;
+
+        if (eveny)
+        {
+            sum =       (evenFlag * co3 ) * s_srcPatch[lsizey-16][1 + ((tidx - 2) >> 1)];
+            sum = sum + ( oddFlag * co2 ) * s_srcPatch[lsizey-16][1 + ((tidx - 1) >> 1)];
+            sum = sum + (evenFlag * co1 ) * s_srcPatch[lsizey-16][1 + ((tidx    ) >> 1)];
+            sum = sum + ( oddFlag * co2 ) * s_srcPatch[lsizey-16][1 + ((tidx + 1) >> 1)];
+            sum = sum + (evenFlag * co3 ) * s_srcPatch[lsizey-16][1 + ((tidx + 2) >> 1)];
+        }
+
+        s_dstPatch[tidy][tidx] = sum;
+    }
+
+    if (tidy > 13)
+    {
+        sum = 0;
+
+        if (eveny)
+        {
+            sum =       (evenFlag * co3) * s_srcPatch[lsizey-7][1 + ((tidx - 2) >> 1)];
+            sum = sum + ( oddFlag * co2) * s_srcPatch[lsizey-7][1 + ((tidx - 1) >> 1)];
+            sum = sum + (evenFlag * co1) * s_srcPatch[lsizey-7][1 + ((tidx    ) >> 1)];
+            sum = sum + ( oddFlag * co2) * s_srcPatch[lsizey-7][1 + ((tidx + 1) >> 1)];
+            sum = sum + (evenFlag * co3) * s_srcPatch[lsizey-7][1 + ((tidx + 2) >> 1)];
+        }
+        s_dstPatch[4 + tidy][tidx] = sum;
+    }
+
+    barrier(CLK_LOCAL_MEM_FENCE);
+
+    sum =       co3 * s_dstPatch[2 + tidy - 2][tidx];
+    sum = sum + co2 * s_dstPatch[2 + tidy - 1][tidx];
+    sum = sum + co1 * s_dstPatch[2 + tidy    ][tidx];
+    sum = sum + co2 * s_dstPatch[2 + tidy + 1][tidx];
+    sum = sum + co3 * s_dstPatch[2 + tidy + 2][tidx];
+
+    if ((x < dst_cols) && (y < dst_rows))
+        storepix(convertToT(sum), dstData + y * dst_step + x * PIXSIZE);
+}
+
+
+__kernel void pyrUp_unrolled(__global const uchar * src, int src_step, int src_offset, int src_rows, int src_cols,
+                         __global uchar * dst, int dst_step, int dst_offset, int dst_rows, int dst_cols)
 {
     const int lx = 2*get_local_id(0);
     const int ly = 2*get_local_id(1);
@@ -104,9 +201,9 @@ __kernel void pyrUp(__global const uchar * src, int src_step, int src_offset, in
 
     FT sum;
 
-    const FT co1 = 0.375f;
+    const FT co1 = 0.75f;
-    const FT co2 = 0.25f;
+    const FT co2 = 0.5f;
-    const FT co3 = 0.0625f;
+    const FT co3 = 0.125f;
 
     // (x,y)
     sum =       co3 * s_srcPatch[1 + (ly >> 1)][1 + ((lx - 2) >> 1)];
@@ -172,7 +269,7 @@ __kernel void pyrUp(__global const uchar * src, int src_step, int src_offset, in
     sum = sum + co3 * s_dstPatch[2 + ly + 2][lx];
 
     if ((dst_x < dst_cols) && (dst_y < dst_rows))
-        storepix(convertToT(4.0f * sum), dstData + dst_y * dst_step + dst_x * PIXSIZE);
+        storepix(convertToT(sum), dstData + dst_y * dst_step + dst_x * PIXSIZE);
 
     // (x+1,y)
     sum =       co3 * s_dstPatch[2 + ly - 2][lx+1];
@@ -182,7 +279,7 @@ __kernel void pyrUp(__global const uchar * src, int src_step, int src_offset, in
     sum = sum + co3 * s_dstPatch[2 + ly + 2][lx+1];
 
     if ((dst_x+1 < dst_cols) && (dst_y < dst_rows))
-        storepix(convertToT(4.0f * sum), dstData + dst_y * dst_step + (dst_x+1) * PIXSIZE);
+        storepix(convertToT(sum), dstData + dst_y * dst_step + (dst_x+1) * PIXSIZE);
 
     // (x,y+1)
     sum =       co3 * s_dstPatch[2 + ly+1 - 2][lx];
@@ -192,7 +289,7 @@ __kernel void pyrUp(__global const uchar * src, int src_step, int src_offset, in
     sum = sum + co3 * s_dstPatch[2 + ly+1 + 2][lx];
 
     if ((dst_x < dst_cols) && (dst_y+1 < dst_rows))
-        storepix(convertToT(4.0f * sum), dstData + (dst_y+1) * dst_step + dst_x * PIXSIZE);
+        storepix(convertToT(sum), dstData + (dst_y+1) * dst_step + dst_x * PIXSIZE);
 
     // (x+1,y+1)
     sum =       co3 * s_dstPatch[2 + ly+1 - 2][lx+1];
@@ -202,5 +299,5 @@ __kernel void pyrUp(__global const uchar * src, int src_step, int src_offset, in
     sum = sum + co3 * s_dstPatch[2 + ly+1 + 2][lx+1];
 
     if ((dst_x+1 < dst_cols) && (dst_y+1 < dst_rows))
-        storepix(convertToT(4.0f * sum), dstData + (dst_y+1) * dst_step + (dst_x+1) * PIXSIZE);
+        storepix(convertToT(sum), dstData + (dst_y+1) * dst_step + (dst_x+1) * PIXSIZE);
 }

modules/imgproc/src/pyramids.cpp

@@ -478,12 +478,23 @@ static bool ocl_pyrUp( InputArray _src, OutputArray _dst, const Size& _dsz, int
             doubleSupport ? " -D DOUBLE_SUPPORT" : "",
             ocl::typeToStr(depth), channels, local_size
     );
-    ocl::Kernel k("pyrUp", ocl::imgproc::pyr_up_oclsrc, buildOptions);
+    size_t globalThreads[2];
+    ocl::Kernel k;
+    if (ocl::Device::getDefault().isIntel() && channels == 1)
+    {
+        k.create("pyrUp_unrolled", ocl::imgproc::pyr_up_oclsrc, buildOptions);
+        globalThreads[0] = dst.cols/2; globalThreads[1] = dst.rows/2;
+    } 
+    else
+    {
+        k.create("pyrUp", ocl::imgproc::pyr_up_oclsrc, buildOptions);
+        local_size = 16;
+        globalThreads[0] = dst.cols; globalThreads[1] = dst.rows;
+    }
     if (k.empty())
         return false;
 
     k.args(ocl::KernelArg::ReadOnly(src), ocl::KernelArg::WriteOnly(dst));
-    size_t globalThreads[2] = {dst.cols/2, dst.rows/2};
     size_t localThreads[2]  = {local_size, local_size};
 
     return k.run(2, globalThreads, localThreads, false);