Localization and extraction of the four clock-digits using the knowledge of the digital video clock

This paper presents a novel algorithm for localizing and extracting the four clock-digits by using the knowledge of the digital video clock. This algorithm has triple merits compared with the existing ones. First, it is novel and easy implementation. It uses the pixel second-periodicity method. By using this method the algorithm omits the several tedious image processing steps. Second, it is faster than the existing algorithms. Third, it has good performance in both localization and extraction. The good performance is due to that it uses the domain knowledge in acquiring the digits color and in modeling the clock-digits layout. Experimental results show that our algorithm achieves an accuracy of 100% in localizing the four clock-digits at a very low computing cost and extracts the four clock-digits in a high accuracy.