A Study on Effective Digital Watermarking Method Suitable for QR code

Recently, many studies are being conducted related to the method of inserting the digital watermark in the QR code. The QR code is made up of a simple repeating black and white module and has many differences compared to general images. In this paper, a watermarking algorithm that can increase the amount of information to be concealed by minimizing the degradation of QR code image quality is proposed. The algorithm proposed in this paper is not a new algorithm. After conducting a comparative analysis of few algorithms previously developed, one type of algorithm that meets the characteristics of QR code image was selected. And through experiments, show that it will not degrade the image quality even when more amount of watermark is inserted than the previously proposed methods, and also show that the algorithm selected in this paper is suitable for inserting the watermark in the QR code.