A Mosaic Puzzle Camouflage and Restoration Method Based on Superposition of Fan-shaped Composition Units
A mosaic and fan-shaped technology, applied in the field of camouflage and restoration of mosaic puzzles based on the superposition of fan-shaped composition units, can solve the problems of easy loss of embedded parameters, difficulty in resisting steganographic analysis detection, poor robustness, etc. , high safety effect
Active Publication Date: 2021-07-27
SHAANXI NORMAL UNIV
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These modified embeddings will inevitably leave traces of modification in the cover image, which will easily arouse the suspicion of potential attackers and be difficult to resist the detection of steganalysis. In addition, these methods usually use LSB embedding based on non-significant bits. For example, the LSB-based reversible information embedding method is less robust when attacked, and the embedded parameters are easy to lose
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[0114] The following takes JAVA jdk1.8.0_65 as an example implementation environment, and describes the implementation of the present invention in detail in conjunction with the accompanying drawings, but is not limited to this example.
[0115] refer to figure 1 , the mosaic puzzle camouflage method based on fan-shaped composition unit superposition of the present invention comprises the following steps:
[0116] Step 1: Enter the bunker image Radius r, r>0 and fan-shaped segmentation parameter w, w>0, using the key K 0 Generate random key images with random semicircles as composition units and a random starting region in the range [0,4w-1]
[0117] In step 1, m 1 ,m 0 and n 1 ,n 0 The constraints that are satisfied are:
[0118]
[0119] For example: take the mask image resolution m 0 =n 0 =4, R=8, radius r=11 and fan-shaped segmentation parameter w=8, then m can be obtained according to formula (1) 1 = m 0 ×(2r-1)=4×(2·11-1)=84, n 1 =n 0 ×(2r-1)=4×(2·11...
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The present invention proposes a mosaic puzzle camouflage and recovery method based on the superposition of fan-shaped composition units. First, the cover image is converted into a halftone cover image with the fan-shaped image as the composition unit, and a random semicircle fan-shaped key image is generated by using a key; and then Referring to the random fan-shaped key image, the secret information is encoded by adjusting the random rotation angle of the halftone mask image; when recovering, the secret information is reconstructed by calculating the overlapping area of the random key image and the halftone mask image. Compared with the existing method, the present invention uses the random key image as a reference template, and expresses the secret information by adjusting the fan-shaped corner in the halftone mosaic cover image, without introducing any deviation in the expression process, and the present invention can restore Relying entirely on the key, without the correct key it will not be possible to extract the secret information through fan image superposition.
Description
technical field [0001] The invention belongs to the cross field of image information security and digital image signal processing, and relates to an image camouflage and recovery method, in particular to a mosaic puzzle camouflage and recovery method based on the superposition of fan-shaped composition units. Background technique [0002] In order to ensure the security of secret information transmission, people have proposed a variety of information hiding methods using images as carriers, including steganography, sharing, watermarking and camouflage. Among them, the puzzle-based mosaic camouflage strategy is a typical information hiding strategy. This kind of method uses the small blocks divided by the dense map as a dictionary, and generates meaningful cover through the puzzle. For example, Lai I J, 2011 (Lai I J, Tsai W H. Secret-fragment-visible mosaic image–a new computer art and its application to information hiding [J]. IEEE Transactions on Information Forensics & Se...
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IPC IPC(8): H04N1/32H04N1/44G06T1/00G06T11/60
CPCG06T1/0021G06T11/60H04N1/32267H04N1/32272H04N1/44
Inventor 邵利平王洋赵运营陆海
Owner SHAANXI NORMAL UNIV