Representation of Thai character features with impulse response of FIR system

This paper proposes a concept of how to representation of Thai character features with impulse response of FIR system. The character or numeral image captured by a digital camera is converted to binary image. The character and numeral features extraction method is performed that consists of edge contour detection, thinning, and searching for coordinates of character and number. Then its coordinates is normalized and the DCT coefficients in horizontal and vertical components of coordinates are calculated. Finally, the impulse response of FIR system of that character and number is determined by setting the DCT coefficients in horizontal and vertical components as input and output of FIR system, respectively. The aim of this research is to apply the proposed concept to identify and recognize the characters and numbers on Thai license plate. On experiments, 100 car images are tested to identify the characters and numbers of plate number on Thai license plate. The experimental results shown the accuracy of the proposed method is about 87%.