Print-type steganography robust against geometric transformation and its application to ubiquitous services

以二维码为代表的二维码目前已经得到了广泛的应用，但由于其所描绘的是一种无机的图案，因此存在着对印刷品设计有害的问题。在本研究中，我们提出了一种易于被用户识别的二维码生成方法，该方法对原始图像和设计质量的影响最小。实验结果表明了该方法的有效性。

Two-dimensional code typified by the QR code is now spread widely, but it has problem that it is harmful to design of printed materials because they depict an inorganic pattern. In this study, we propose a generating method of two-dimensional code which is easily recognized by users with minimum deterioration of original image and design quality. The results of experiments to extract embedded information from printed materials captured by cell phone attached camera indicate the effectiveness of the proposed method.