A high capacity combined reversible watermarking scheme for 2-D CAD engineering graphics
Compared with the wide research on reversible watermarking scheme for raster image, the research on its counterpart for 2-D CAD engineering graphics lags far behind. In this paper, based on improved quantization index modulation (IQIM) and improved difference expansion (IDE), a combined reversible watermarking scheme is proposed for 2-D CAD engineering graphics. The proposed scheme can solve the embedding-limitation problem existing in IQIM technique and increase the watermark embedding capacity greatly. Theoretical analysis and experimental results also show that the proposed scheme has good imperceptibility and robustness.
reversible watermarking 2-d cad engineering graphics improved quantization index modulation (iqim) improved difference expansion (ide) embedding capacity