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Comparing a captured image with a given image.

Hi there! I am working on a project which requires the detection of road signs. I was wondering that if I could take sample images of the road signs, save them onto my PC(final version to run on Raspberry Pi), and then as the camera runs, it keeps on checking the presence of the sign stored in the memory and when it is found takes appropriate action(For example if I implement it in a robot, whenever the robot sees a stop sign, it should stop for, say 10 seconds and then start moving again.)

Can anyone help me out on this?