LOT based adaptive image watermarking

A LOT (Lapped Orthogonal Transform) based adaptive image watermarking method is proposed, including the two-step scheme designed for watermark embedding and detection. As an emerging technology, digital image watermarking provides an effective solution to the problem of copyright protection. LOT is first adopted in the watermarking algorithm instead of DCT, which greatly reduces the blocking effects. Moreover, the property of Human Visual System (HVS) is utilized to classify image blocks so that the watermark embedding can be adaptively implemented. Experimental results demonstrate that the proposed watermarking method has good performance on both robustness and transparency.