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How to recognize traffic sign when it is small in image sequence ?

Hi all, I am working on traffic sign recognition using template matching. I am able to find correct result when vehicle is near to traffic sign. But when it is away, means candidate is small in image, result is poor & false. So,please suggest how should i approach ( any algo, idea, concept etc..) to solve this problem. For reference please see cropped taffic sign from image sequence ( to make it easy ). How i can make to recognize correctly at/before image 1 or brfore image 2 ? Any suggestion, i am just 3 month old in computer vision. Thanks in advance.

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