An Improved Algorithm of Watermark Preprocessing Based on Arnold Transformation and Chaotic Map

2016 ◽  
pp. 241-247
Author(s):  
Dongbo Zhang ◽  
Jingbo Zhang
Keyword(s):  
Chaotic Map ◽  
Arnold Transformation ◽  
Improved Algorithm

A Watermark Preprocessing Algorithm Based on Arnold Transformation and Logistic Chaotic Map

2011 ◽  
Vol 341-342 ◽  
pp. 720-724 ◽  
Author(s):  
Wang Sheng Fang ◽  
Lu Lu Wu ◽  
Rong Zhang
Keyword(s):  
Correlation Analysis ◽  
Image Encryption ◽  
Chaotic Map ◽  
Encryption Algorithm ◽  
Arnold Transform ◽  
Key Space ◽  
Key Sensitivity ◽  
Logistic Chaotic Map ◽  
Arnold Transformation ◽  
Image Encryption Algorithm

One of the main purpose of the watermark preprocessing is to improve the robustness and security. For this reason,this paper presents an image encryption algorithm, which combines position scrambling and gray scrambling scrambled according to Arnold transform.Then all of the pixels of each sub-block are scambled by the algorithm based on Logistic chaotic map.Finally, all of the Pixels are redistributed and scrambled totally.Basing on image location scrambling,it takes advantage of multi-dimensional Arnold transformation and Logistic chaotic map, image gray scrambling is achieved. By histogram analysis,key sensitivity anslysis and correlation analysis of adjacent pixels of the results of the simulation, indicating that the scrambling effect of the algorithm is good,and the key space is large.

scholarly journals Improved Bat Algorithm Based on Multipopulation Strategy of Island Model for Solving Global Function Optimization Problem

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Sha-Sha Guo ◽  
Jie-Sheng Wang ◽  
Xiao-Xu Ma
Keyword(s):  
Chaotic Map ◽  
Bat Algorithm ◽  
Convergence Speed ◽  
Function Optimization ◽  
Island Model ◽  
Search Performance ◽  
Simulation Experiments ◽  
Global Function ◽  
Contraction Factor ◽  
Improved Algorithm

The bat algorithm (BA) is a heuristic algorithm that globally optimizes by simulating the bat echolocation behavior. In order to improve the search performance and further improve the convergence speed and optimization precision of the bat algorithm, an improved algorithm based on chaotic map is introduced, and the improved bat algorithm of Levy flight search strategy and contraction factor is proposed. The optimal chaotic map operator is selected based on the simulation experiments results. Then, a multipopulation parallel bat algorithm based on the island model is proposed. Finally, the typical test functions are used to carry out the simulation experiments. The simulation results show that the proposed improved algorithm can effectively improve the convergence speed and optimization accuracy.

REDUCTION OF DYNAMIC LOSSES IN THE ACTIVE ONE-PHASE FOUR-QUADRANT CONVERTER WITH THE IMPROVED ALGORITHM OF HYSTERESIS MODULATION

2018 ◽  
Vol 2018 (51) ◽  
pp. 88-94 ◽  
Author(s):  
O.A. Plakhtiy ◽  
◽  
V.P. Nerubatskiy ◽  
D.L. Sushko ◽  
V.E. Kavun ◽  
...  
Keyword(s):  
Four Quadrant ◽  
Improved Algorithm

Improved LSB method for Image Steganography using H´enon Chaotic Map

2014 ◽  
Vol 2014 (1) ◽  
pp. 34-42 ◽  
Author(s):  
N. S. Raghava ◽  
◽  
Ashish Kumar ◽  
Aishwarya Deep ◽  
Abhilasha Chahal ◽  
...  
Keyword(s):  
Chaotic Map ◽  
Image Steganography

Improved algorithm for solving multi-route planning—based on travel route planning of USA state city

2014 ◽  
Author(s):  
Liyao Yang ◽  
Yihao Guo ◽  
Qian Chen ◽  
Kailian Lin ◽  
Shiyu Lin ◽  
...  
Keyword(s):  
Route Planning ◽  
Improved Algorithm

Image Encryption Algorithm Based on Substitution Principle and Shuffling Scheme

2020 ◽  
Vol 38 (3B) ◽  
pp. 98-103
Author(s):  
Atyaf S. Hamad ◽  
Alaa K. Farhan
Keyword(s):  
Image Encryption ◽  
Chaotic Map ◽  
Logistic Map ◽  
Encryption Algorithm ◽  
Second Phase ◽  
Cipher Text ◽  
The Face ◽  
Substitution Principle ◽  
2D Logistic Map ◽  
Image Encryption Algorithm

This research presents a method of image encryption that has been designed based on the algorithm of complete shuffling, transformation of substitution box, and predicated image crypto-system. This proposed algorithm presents extra confusion in the first phase because of including an S-box based on using substitution by AES algorithm in encryption and its inverse in Decryption. In the second phase, shifting and rotation were used based on secrete key in each channel depending on the result from the chaotic map, 2D logistic map and the output was processed and used for the encryption algorithm. It is known from earlier studies that simple encryption of images based on the scheme of shuffling is insecure in the face of chosen cipher text attacks. Later, an extended algorithm has been projected. This algorithm performs well against chosen cipher text attacks. In addition, the proposed approach was analyzed for NPCR, UACI (Unified Average Changing Intensity), and Entropy analysis for determining its strength.

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