基于整数DCT变换的矢量地图可逆数字水印算法

A Reversible Digital Watermarking Algorithm Based on Integer DCT Transform for Vector Maps

针对矢量地图对精度要求的特殊性，提出了一种基于整数DCT变换的可逆数字水印算法。通过对整数DCT变换后的高频系数进行修改来实现水印信息的调制嵌入，并提出了相应的容量提升和误芹控制方案。实验证明，该算法嵌入容量较大，能够在精确提取水印信息的州时实现原始载体数据的完全无损恢复。

In order to meet the requirement of vector map for high precision, this paper presents a reversible watermarking algorithm based on integer DCT（ discrete cosine transform）, which uses a high frequency coefficient modification technique in the integer DCT domain to modulate the watermark, and then the corresponding embedding capacity increase scheme and error control scheme are also proposed. The test results show that this algorithm has a large embedding capacity, and during the information extraction process, the original data can be perfectly rcstored with the embedded watermark accurately extracted at the same time.