Photo recognition with webcam

in a few months I've got a game to play, but I want to cheat a bit :P by using some webcams.

The game is simple you drive with your car a开发者_StackOverflow社区round and try to spot images that are taken of the roadside. But I was thinking if I use some webcams, I could scan the surrounding for these photos. I will probably still need to look for these photos but it helps me a lot.

I was thinking maybe I should use OpenCV with Feature Detection, but is this the smartest?

Better than the smartest, you should look for the stronger one.

Some times ago I've worked with opencv + SIFT which gives support for rototraslation of what you're looking for and can do progressive finding by adding feature to the checks.

It may be a good idea, and you can find opencv implementation here