message: Optimize OpenCL BackgroundSubstractionMOG2
diff: #define meanToFrame(a, b) *b = (float)a;
  #endif
  -inline float sum(float val)
  -{
  - return val;
  -}
  -
  #else
  #define T_MEAN float4
  @@ -40,11 +35,6 @@ inline float sum(float val)
  b.z = a[2]; \
  b.w = 0.0f;
  -inline float sum(const float4 val)
  -{
  - return (val.x + val.y + val.z);
  -}
  -
  #endif
  __kernel void mog2_kernel(__global const uchar* frame, int frame_step, int frame_offset, int frame_row, int frame_col, //uchar || uchar3
  @@ -210,9 +200,7 @@ __kernel void mog2_kernel(__global const uchar* frame, int frame_step, int frame
  int mode_idx = mad24(mode, idx_step, pt_idx);
  T_MEAN c_mean = _mean[mode_idx];
  - T_MEAN pix_mean = pix * c_mean;
  -
  - float numerator = sum(pix_mean);
  + float numerator = dot(pix, c_mean);
  float denominator = dot(c_mean, c_mean);
  if (denominator == 0)
  