A Novel HDR Image Zero-Watermarking Based on Shift-Invariant Shearlet Transform

In this paper, a novel high dynamic range (HDR) image zero-watermarking algorithm against the tone mapping attack is proposed. order to extract stable and invariant features for robust zero-watermarking, shift-invariant shearlet transform (SIST) used HDR image. Firstly, converted CIELAB color space, L component selected perform SIST obtaining low-frequency subband containing structure information of Secondly, divided into nonoverlapping blocks, which are transformed by using discrete cosine (DCT) singular value decomposition (SVD) obtain maximum values constructing binary feature To increase watermarking security, hybrid chaotic (HCM) employed get scrambled watermark. Finally, an exclusive-or operation performed between watermark compute zero-watermark. Experimental results show that proposed has good capability resisting other processing attacks.