Lossless watermarking for digital elevation mode data
Cheng Li-zhi · Computer Engineering and Applications Journal · 2007
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.