Itseez/opencv — pull request #3557 by ilya-lavrenov (2014-12-29 19:03:14+00:00)
Title: SSE2 optimization of addWeighted

```
addWeighted::Size_MatType::(640x480, 8SC1) 2.257 ms 0.166 ms 13.58
addWeighted::Size_MatType::(640x480, 16SC1) 2.211 ms 0.162 ms 13.65
addWeighted::Size_MatType::(1280x720, 8SC1) 6.750 ms 0.493 ms 13.69
addWeighted::Size_MatType::(1280x720, 16SC1) 6.638 ms 0.448 ms 14.82
addWeighted::Size_MatType::(1920x1080, 8SC1) 15.111 ms 1.156 ms 13.07
addWeighted::Size_MatType::(1920x1080, 16SC1) 14.994 ms 1.135 ms 13.21
```