Three-dimensional image fragile watermark method based on joint just noticeable distortion

Abstract

The invention discloses a three-dimensional image fragile watermark method based on joint just noticeable distortion and in particular relates to a three-dimensional image location tampering and restoring fragile watermark algorithm based on JJND (Joint Just Noticeable distortion). Firstly, a three-dimensional image block is divided into a relative sensitive block and a relative insensitive block according to a JJND model and the number of three-dimensional image match blocks, then discrete cosine transform and quantization compression are carried out on the image blocks to generate watermarks, and unsymmetrical watermark embedding of different type blocks of the three-dimensional image is built according to the JJND model and types of the image blocks. Restored watermarks can be used for locating the positions of the tampered portions to further improve transparency of the image. Meanwhile, copy embedding of the restored watermarks in the three-dimensional image can improve the capacity for the watermarks to restore tampered information. Experiments show that the three-dimensional image fragile watermark method based on the joint just noticeable distortion is accurate in location on the tampered positions and has higher restoring capacity on the tampered areas.

Description

technical field [0001] The invention relates to a digital watermarking technology, in particular to a fragile watermarking method for stereoscopic images based on joint just perceivable distortion. Background technique [0002] In recent years, 3D video image-related technologies have made great progress, and related high-tech products have entered people's lives through various methods such as networks, storage devices, and satellite transmissions, and have been welcomed by more and more consumers. and favorite. However, issues such as digital media security, intellectual property protection and certification have become increasingly prominent. As an effective means of intellectual property protection of media works, digital watermarking technology has received widespread attention. Fragile watermarking technology is mainly used for image integrity and authenticity authentication. According to its function, it can be divided into two categories: one kind of fragile waterm...

AI Technical Summary

Problems solved by technology

Niu combined the brightness masking and contrast masking of the image, and proposed a robust watermarking based on the joint perceptible distortion model, but there is little research on the stereoscopic fragile watermarking method based on stereoscopic vision masking.

[0004] The three-dimensional digital watermarking methods mentioned above have the following problems: on the one hand, research on their fragile watermarking methods and their applications based on stereoscopic images is relatively rare; Transparency and capacity to embed watermarks need to be further improved

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