An Improvement Method for Data Embedding to Printing Images Based on DCT

Kouji Nakanishi, Mitsuji Muneyasut
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Abstract

This paper proposes an improvement method for a data embedding technique to printing images. This embedding technique is based on discrete cosine transform (DCT) and pseudo number (PN) sequences. In the conventional method, deformations, such as rotation and scaling have given a serious defect to the extraction rate. To solve this problem, a new data embedding position and the processing by the resolution of scanner itself are applied. The gain control method is also improved. From the comparison between the proposed and conventional methods, the improvement of the extraction rate in the proposed method is shown.
一种基于DCT的打印图像数据嵌入改进方法
本文提出了一种针对打印图像的数据嵌入技术的改进方法。该嵌入技术基于离散余弦变换(DCT)和伪数序列。在传统的方法中,变形,如旋转和缩放给提取速度带来了严重的缺陷。为了解决这一问题,采用了一种新的数据嵌入位置和扫描仪自身分辨率的处理方法。对增益控制方法也进行了改进。通过与传统方法的比较,表明了该方法对提取率的提高。
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