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An image encryption algorithm based on a novel two-dimensional hyperchaotic map and difference algorithm

NONLINEAR DYNAMICS 2025年第4期113卷 3801-3828页

作者： Deng, Yong Tian, Xiaomei Chen, Zhong Xiao, Yongquan Xiao, Yanting Hengyang Normal Univ Coll Comp Sci & Technol Hengyang 421002 Peoples R China Hunan Prov Key Lab Intelligent Informat Proc & Ap Hengyang 421002 Peoples R China

Currently, many existing image encryption algorithms have encountered challenges in achieving robustness and efficiency, mainly due to insufficient scrambling or inadequate diffusion mechanisms. These limitations can lead to vulnerabilities, making encrypted images more susceptible to attacks and reducing overall security. To address these issues, this paper proposes a new image encryption algorithm (MCLCM-IEA) based on a novel two-dimensional hyperchaotic map (2D-MCLCM). This algorithm integrates a difference algorithm during diffusion and a double-pointer algorithm during scrambling. Additionally, to enhance the security of cipher images, we introduce a plaintext-related weight matrix, which not only expands the key space of MCLCM-IEA but also strengthens its overall security. Benefiting from the superior chaotic properties exhibited by 2D-MCLCM, the strong diffusion efficiency got from the difference diffusion algorithm, and the effective scrambling provided by the double-pointer algorithm, MCLCM-IEA performs exceptionally well in simulation experiments. The results demonstrate that MCLCM-IEA can effectively resist various illegal attacks and showcase robust security and high efficiency.

关键词： Image encryption Chaos Hyperchaotic map difference algorithm Image security

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An improved three-point method based on a difference algorithm

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PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY 2020年 63卷 68-82页

作者： Huang, Ran Pan, Wei Lu, Changhou Zhang, Yixin Chen, Shujiang Shandong Univ Sch Mech Engn Key Lab High Efficiency & Clean Mech Manufacture Jinan 250061 Shandong Peoples R China

The reason for the rounding error in a measurement system under the condition of a limited sampling period is analysed, and a three-point method based on the difference algorithm (D3P method) is proposed. The effect of the rounding error is reduced by differential approximation of the roundness error and reconstruction of the transfer function. The generalized three-point method (G3P method), the three-point method based on the first-order difference algorithm (I-D3P method) and the three-point method based on the second-order difference algorithm (II-D3P method) are compared and analysed by simulation. The results show that the accuracy of the D3P method is greatly improved compared with that of the G3P method under the restricted sampling period and that the D3P method retains high precision in the case of failed error separation of the G3P method. An experimental system was constructed to realize error separation, and the experimental results show that the D3P method has higher accuracy than the G3P method over a small sampling period.

关键词： Three-point method difference algorithm Roundness error Error separation

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FATIGUE DETECTION BASED ON FACIAL IMAGES PROCESSED BY difference algorithm 13

FATIGUE DETECTION BASED ON FACIAL IMAGES PROCESSED BY DIFFER...

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13th IASTED International Conference on Biomedical Engineering (BioMed)

作者： Chen, Jia Tao, Yin Zhang, Dalong Liu, Xiaoli Fang, Zhen Zhou, Qinwu Zhang, Bo Xi An Jiao Tong Univ Sch Life Sci & Technol Xian Shaanxi Peoples R China

ISBN: (纸本)9780889869905

In this paper a technique for detecting the daily fatigue using the characteristics of local facial image is discussed. To reduce the influence of environment illumination and retain more details of features, the images are preprocessed by the method of color consistent area correction. The texture and color features are derived from the gray level co-occurrence matrix and two kinds of color space, and the reliability and universality of the system is improved by the difference algorithm. Then the error backward propagation algorithm is employed to form a complete detection algorithm. Finally, the method achieves 92.3% accuracy with the self-built image database. With convenient data acquisition source and low computational complexity, the proposed method has a good prospect for the application in the field of home medical devices and mobile health devices.

关键词： fatigue detection facial image color consistent area correction difference algorithm

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Study on the Influence Factors of Surrounding Tunnel Longitudinal Deformation Caused by Pit Excavation Based on Nonlinear Pasternak Modeling

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BUILDINGS 2025年第9期15卷 1504-1504页

作者： Zhao, Honghua Song, Yutao Nanjing Tech Univ Coll Transportat Engn Nanjing 211816 Peoples R China Yangzhou Survey Design Res Inst Co Ltd Yangzhou 225007 Peoples R China

In practical engineering, it is often necessary to constructed deep pits next to tunnels. So it is crucial to evaluate surrounding tunnels deformation and stress to ensure their safe operation. Pasternak soil model that considers soil nonlinear is adopted to solve tunnel beam's differential equation to obtain longitudinal tunnel deformation and stress. The rationality of considering soil nonlinear methods was verified by contrasting measured with calculated results. On this basis, a comparative study was conducted on the calculation and analysis of various influencing factors based on engineering examples. It shows that the longitudinal tunnel deformation reduces with increase of soil modulus, tunnel axis and pit long side angle, tunnel stiffness reduction coefficient, tunnel axis and pit center horizontal distance. When discrete length of tunnel is less than 5 m, calculated value of longitudinal tunnel deformation changes little with discrete length. When pit depth increases, maximum longitudinal tunnel deformation also increases gradually. When tunnel buried depth gradually increases in the range of 1.5 similar to 3.9 times pit depth, maximum longitudinal tunnel deformation reduction rate becomes small. Similar pro-jects construction methods can refer to the results, and it have certain practical application value of engineering.

关键词： pit excavation existing tunnels nonlinear model difference algorithm Newton's iterative method longitudinal deformation

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A Greedy algorithm-based scheme for high-quality visually meaningful image encryption

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PHYSICA SCRIPTA 2025年第3期100卷 035030-035030页

作者： Deng, Yong Tian, Xiaomei Chen, Zhong Xiao, Yanting Xiao, Yongquan Zuo, Yiyu Hengyang Normal Univ Coll Comp Sci & Technol Hengyang 421002 Peoples R China Hengyang Normal Univ Hunan Engn Res Ctr Cyberspace Secur Technol & Appl Hengyang 421002 Peoples R China Hunan Prov Key Lab Intelligent Informat Proc & App Hengyang 421002 Peoples R China Hunan Appl Technol Univ Sch Informat Engn Changde 415100 Peoples R China

To address the limitations of existing visually meaningful image encryption algorithms in terms of visual quality and adaptability across different wavelet types, this paper introduces a novel greedy algorithm-based embedding method. Our approach innovatively selects the optimal decomposition basis dynamically by calculating an error value for each candidate basis, tailored to the specific characteristics of both the host and plaintext images. This error-based selection process significantly enhances visual quality across a spectrum of wavelet transformations. Furthermore, we propose a novel two-dimensional hyperchaotic map (2D-RECM), characterized by its hyperchaotic behavior across a broad range of control parameters. The integration of 2D-RECM with our embedding algorithm results in a robust visually meaningful image encryption algorithm (RECM-VMIEA). Extensive simulations and analyses confirm that RECM-VMIEA not only maintains high visual quality but also exhibits exceptional security and robustness, outperforming existing algorithms in these critical aspects.

关键词： visually meaningful image encryption hyperchaotic map integer wavelet transform difference algorithm

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Research of Magnetic Field Navigation Intelligent Vehicle System Based on difference algorithm 3

Research of Magnetic Field Navigation Intelligent Vehicle Sy...

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3rd International Conference on Mechatronics and Control Engineering (ICMCE)

作者： Dong, Wu Bie, Hongxia Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100088 Peoples R China

ISBN: (纸本)9783038352914

To implement intelligent vehicle control system based on magnetic field detection, automation navigation scheme based on difference algorithm is proposed. The feature of magnetic field of the road is analyzed, and layout method of sensors is proposed, and signals of magnetic field sensors are gathered and filtered, and road control strategy based on difference algorithm is proposed, and steering gear is used to implement cornering of intelligent vehicle, and position PID algorithm is used to implement speed control of intelligent vehicle. The experiment result shows that intelligent vehicle using this scheme can work steadily at high speed, and has higher practicability and is worth to be propagated in many fields.

关键词： magnetic field navigation intelligent vehicle difference algorithm

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Study of Power Scheme Design for Riders

World Scientific Research Journal

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World Scientific Research Journal 2022年第7期8卷 717-728页

作者： Wankang Wang Jilong Zhang Haoming Li Shixin Qi

In this paper, a power‐time distribution model for different types of drivers is established. We adopt the OPD model to determine the power‐duration model with FTP as a constraint. Calculating the duration of different riders in different road sections, and determining the FTP value of different riders. A resistance model with slope and speed as independent variables and power as dependent variable is established. A single-objective optimization model is established. The goals are the interval time and the minimum value. In addition, a rider power ‐ slope ‐ wind speed - curve‐distance model under environmental influence is established. Finally, the target power‐target time influence model under different driving speeds and wind speeds is established. Sensitivity analysis of the considered models was carried out by controlling variables method.

关键词： FTP Recursive method difference algorithm Single objective optimization Linear programming

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Signal processing method for measurement of sub-period speed fluctuation

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MEASUREMENT 2021年 183卷 109835-109835页

作者： Zhang, Zhenyu Shi, Shendong Ren, Yongjie Zhu, Jigui Tianjin Univ State Key Lab Precis Measuring Technol & Instrume Tianjin 300072 Peoples R China

Sub-period speed fluctuations of the measuring unit for a photoelectric scanning measurement network can directly affect the accuracy of the entire system. This study proposes a signal processing method for the measurement of subtle sub-period rotation speed fluctuation that includes two corresponding processing methods for different speed ranges. For the low-speed range, the specific steps included the calibration of the encoder gratings and relative measurement of the rotation speed. For the high-speed range, the corresponding signal processing method utilised the average speed, which represents the instantaneous speed at the middle moment. The subperiod speed fluctuation is very subtle for precise motion control, accounting for only 0.001% of the speed. Conventional methods cannot acquire the actual sub-period speed fluctuation due to the eccentricity error and scale error. However, the proposed method can measure the subtle sub-period speed fluctuation by filtering the interferences of the eccentricity and scale errors. The proposed method does not require any additional hardware and provides high accuracy.

关键词： Sub-period fluctuation Self-calibration difference algorithm Circle-closure

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Logistics Distribution Path Planning Based on Fireworks Differential algorithm

Logistics Distribution Path Planning Based on Fireworks Diff...

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IEEE International Conference on Systems, Man, and Cybernetics (SMC)

作者： Chen, Dan Zhang, Xiaoyong Gao, Dianzhu Gao, Kai Wen, Mengfei Huang, Zhiwu Cent South Univ Sch Automat Changsha Peoples R China Cent South Univ Sch Comp Sci & Engn Changsha Peoples R China Changsha Univ Sci & Technol Coll Automot & Mech Engn Changsha Peoples R China Changsha Coll Presch Educ Changsha Peoples R China

ISBN: (纸本)9781728185262

Logistics distribution is an important link in logistics. Whether the logistics distribution path can be effectively optimized will directly affect the efficiency of the logistics distribution system. To plan the logistics distribution path reasonably, to reduce the cost of logistics management, for the multi-object path planning problem in logistics distribution, the fireworks differential evolution algorithm is used to design an optimization scheme. To achieve the overall goal of saving logistics and distribution costs, real number coding is used for each distribution point, and actual road information is obtained through the Gaode API. Aiming at the defects of the standard fireworks algorithm, the differential evolution algorithm is introduced based on the fireworks algorithm to plan the distribution route. The simulation results show that the firework differential evolution algorithm can effectively plan the optimal distribution path, and compared with the original firework algorithm, the ant colony algorithm and particle swarm optimization algorithm have a better improvement in the optimization accuracy.

关键词： logistics path plan fireworks algorithm difference algorithm

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Research on high-precision passive localization based on phase difference changing rate

Research on high-precision passive localization based on pha...

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作者： Zhou, Taoyun Cheng, Yun Lian, Baowang Irfana, Bibi Zhao, Hongwei School of Electronics and Information Northwestern Polytechnical University Xi'an China School of Information Hunan University of Humanities Science and Technology Loudi China School of Computer Science and Technology Xidian University Xi'an China

Passive localization method has a wider applicable prospect as a rising localization resort with well flexibility. The acquisition of phase difference changing rate is a very practical problem in passive localization for the way how to get the phase difference, and a better error precision directly affects the accuracy of the localization. Firstly, based on the analysis of the positioning principle of phase difference changing rate, it studies the characteristics of phase difference changing rate and proposes a novel resolving phase ambiguity algorithm based on a double baselines system cosine theorem (DBSCT), which can eliminate the phase difference ambiguity efficiently. Secondly, it studies two typical methods to extract the high-precision phase difference changing rate from the unambiguity phase difference, namely, difference algorithm and Kalman algorithm. Finally, it compares the Kalman algorithm with the difference algorithm through computer simulation. Simulation results show that the Kalman algorithm can efficiently smoothen the phase difference data and suppress the measurement noise to achieve a high positioning accuracy. Simulation results also show that with a certain phase difference measurement accuracy, the phase difference rate accuracy extracted by the Kalman algorithm is higher than that we require. Therefore, we can appropriately relax the phase difference measurement accuracy requirements to achieve the same positioning accuracy. So, it has a great application value. © 2018 John Wiley & Sons, Ltd.

关键词： ambiguity of phase difference difference algorithm Kalman algorithm passive localization phase difference changing rate

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