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The fractal image coding is an effective method of data compression and its prospects are bright for the future. But due to the high computation order of complexity difficulty it faces, it can't be applied widespreadly until now. The author of this article proposes a fast coding algorithm that could reduce the complexity of fractal code computation order and the time. The experimental results indicated...
In this paper, we propose a new method to develop secure image-encryption techniques using a logistics -based encryption algorithm. In this technique, a Haar wavelet transform was used to decompose the image and decorrelate its pixels into averaging and differencing components. [3] The logistic based encryption algorithm produces a cipher of the test image that has good diffusion and confusion properties...
As an important field in information security, image encryption algorithm has been a research focus. At the same time there are few works on fractal set as the encryption key among various encryption algorithms. In the paper, Mandelbrot set (abbreviated as M set) and the Hilbert transformation are utilized to generate the random key. Since M set can be iterated from only a few parameters, it can reduce...
The image watermarking technology is a technique of embedding hidden data in an original image. In this paper, a new watermarking method for embedding watermark bits based on chaos-fractal coding is given. A chaotic signal is defined as being deterministic, pseudo periodic and presenting sensitivity to initial conditions. Combining a chaos system with fractal coding plays an important role in the...
In this paper, a novel image cheat-encryption algori-thm based on hyper-chaotic Chen-system is proposed. The hyper-chaos is employed to encrypt plain image into cheat-like image. The cheat-image is transferred in network and easily neglected by attackers. If cheat succeeds, it is impossible to decrypt. When the cheat-image fails to cheat the attackers, security and performance analysis shows the cheat-encryption...
Efficient and secured transmissions are necessary to ensure proper data protection and transmission speed. Compression and encryption techniques are used to meet these requirements. Fractal geometric is one of the techniques that can combine both compression and encryption together. In this paper, we introduce a new idea of combining image compression and encryption based on fractal geometric. Presently,...
In this paper, a color image watermarking algorithm based on fractal and neural networks in Discrete Cosine Transform (DCT) domain is proposed. Firstly, the algorithm utilizes the fractal image coding technique to obtain the characteristic data of a gray-level image watermark signal and encrypts it by a symmetric encryption algorithm before it was embedded. Secondly, by exploiting the abilities of...
This paper is aimed at the image encryption scheme applicable to JPEG2000 codec. Firstly, two chaotic maps are suggested and their statistic characteristics are also analyzed. Secondly, to accomplish a controllable visual effect of encrypted image, a visual quality control model is presented, and on the basis of which, a chaotic image encryption scheme is constructed by chaotically modulating the...
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