IC CODES INSPECTION BY SIMILARITY MATCHING TECHNIQUE

One of the most important problems in automated integrated circuit (IC ) board inspection is to recognize the codes on the IC. In this paper, we propose a method that is suitable for the recognition of the stamp ed characters on the IC. It first uses the loss function to establish a classifier. Then, by means of feature extraction the similarity meas ure between the recognizing pattern and each of the 36 characters is o btained. Finally, the pattern is determined by choosing the character with the maximum similarity. Furthermore, a character matching method is proposed to increase the efficiency and effectiveness of inspection . This matching method can also reduce the false alarm rate due to poo r printing quality.