Abstract: A blind lossless watermarking method for Digital Elevation Mode（DEM） data via modifying the generalized histogram of the DEM data is presented.Puts forward the concepts of the generalized histogram for DEM data.This algorithm can recover the original DEM data without any distortion from the marked data after the watermarking has been extracted,which owns good value in the economy.The computational complexity of our method is low,which is feasible in dealing with the DEM data of floating-point precision.So can get high PSNR（average 42 dB） of the marked data as ensure the high embedding capacity（≥48.8 KB）,the original shape and relief of the terrain has kept after embedding the watermarking.

摘要： 针对数字高程模型数据（简称DEM数据）提出广义直方图的概念,以DEM数据作为信息承载对象,采用修改广义直方图的方法嵌入水印信息,提取水印时不需要原始数据,水印提取后可完全恢复DEM数据,具有较高的经济价值。此方法计算复杂度低,适宜处理浮点精度的DEM数据,在保证较高峰值性噪比（平均42 dB）的同时嵌入信息量大（≥48.8 KB）,带水印的DEM数据能很好地保持地形形状和起伏特征。