Study on the sequence of steps in the QR code image preprocessing
Noise is inevitable in QR code image's capturing. QR code image preprocessing process by means of graying, filtering and binarization is adopted to discern QR code image. In this article, first of all, the method of binarization before filtering is applied in the QR code image preprocessing. Then median filtering algorithm which is suitable for binary image is applied. According to the result of experiment, this method is better than traditional method in effect and speed.