Watermarking Marbled Image Based on Linear Enhancement Hologram

A marbled image is generated by performing marbling operations on an image. When the marbled image is recovered to the original image, the parameters of the marbling operations should be known in the decoding process. By embedding these into the marbled image, we can eliminate an additional internet transmission. This paper proposes a watermark algorithm for marbled images based on a linear enhancement hologram. First, the parameters of the marbling operations are converted into a QR code image. Second, the QR code image is used to create a hologram. Then, the hologram is linearly enhanced to form a watermark. Finally, the watermark can be embedded into the subband of the discrete wavelet transform of the marbled image using different quantization embedding strengths. Experimental results showed that the algorithm has good invisibility and is robust to various attacks, including cropping, cutting, adding noise, JPEG compression, and filtering.