Digital Image Camouflage and Reconstruction Method Based on Block Sequence

Abstract

The invention discloses a digital image disguising and reconstructing method based on block sequences. The method comprises the following steps: sub blocks obtained by dividing public image and secret image matrixes are scanned into sequences as secret sequences and public sequences; random disturbance is added to the sequences with the same element value; and least squares matching is performed directly on isometric transformation sequences obtained by cyclically moving the secret sequences rightwards and the public sequences in corresponding positions to find out the cyclical rightward moving step size with minimum residual and matching parameters, so that a secret image is disguised as a public image, and the disguised public image can be reconstructed as a secret image. The method of the invention is easy to implement. As only matching of isometric transformation sequences in corresponding positions is performed, the encoding time is reduced, the number of isometric transformations is increased, the matching accuracy is improved, the problems of detail loss and overflow caused by transformation from a smooth block to a complex block and recovery from a smooth block to a complex texture block can be effectively avoided, and the visual quality of disguised and reconstructed images is further improved.

Description

technical field

[0001] The invention belongs to the technical field of information security and digital image signal processing, and relates to a digital image camouflage method, in particular to a block sequence-based digital image camouflage and reconstruction method. Background technique

[0002] In recent years, with the development of computer and network technology, more and more digital images are spread in public channels. Unrestricted access to and use of secret images not only involves personal privacy, media credibility, and government integrity, but can also lead to social unrest and induce military conflicts.

[0003] How to effectively protect secret images transmitted in public channels has become a hot research topic at present. Aiming at this problem, people have proposed a variety of image protection methods, such as digital image encryption technology that converts plaintext images into ciphertext and digital image camouflage technology. Compared with di...

Images