Abstract As a kind of spatiotemporal chaos, coupled map lattice (CML) is widely applied into image encryption because its advantages more complex dynamical behavior and lower computational overhead. Firstly, this paper proposed novel chaos model (MCML) by mixing Logistic, Sine Tent maps CML together. Beyond that, we also change the structure coupling method in different lattices. Bifurcation diagram, Lyapunov exponents NIST test are employed to measure chaotic behaviors MCML system....

In this paper, a new chaotic image encryption algorithm based on pseudo-random bit sequence and DNA plane is proposed. The coupled map lattice (CML) applied to design generation (PBSG) system use the generate random needed in process. initial values parameters of are generated by SHA-256 hash combined with given keys. Firstly, decomposed into four planes combination encoding rules, then subjected row circular permutation column permutation. After that, diffusion operation each performed....

We present a method for detecting inshore ships using high-resolution synthetic aperture radar (SAR) images. The first applies preprocessing steps to obtain the solving region of an SAR image, suitable berthing rules. Then ship candidates are extracted based on maximally stable extremal detector, while detection is applied improved constant false alarm rate (CFAR) detector. Finally, discrimination processing, alarms removed according compactness, therefore ultimate result obtained without...

Inshore ship detection in synthetic aperture radar (SAR) images is a challenging task. We present an inshore method based on the characteristics of ships. first use Markov random field (MRF) to segment water and land, then extract feature points ships using polygonal approximation. Following this, we propose new rules for extraction these separate from land binary images. Finally, utilize adaptive background window (ABW) complete clutter statistic successfully detect constant false alarm...

In recent years, with the rapid development of network communication, information security issues have become increasingly prominent. As an important carrier information, image plays role in transmission process. Therefore, lots encryption algorithms been proposed. However, these are not designed accordance unified standards and requirements, so there may be a lot risks, what is worst thing that some cracked acceptable time complexity by cryptographic analysis. This paper focuses on one most...

We present WeaverBird, an intelligent dialogue system designed specifically for the finance domain. Our harnesses a large language model of GPT architecture that has been tuned using extensive corpora finance-related text. As result, our possesses capability to understand complex financial queries, such as "How should I manage my investments during inflation?", and provide informed responses. Furthermore, incorporates local knowledge base search engine retrieve relevant information. The...

The EMD clustering algorithm based single-phase grounding fault line selection in distribution networks is an effective method to solve the problem of networks. This uses empirical mode decomposition (EMD) decompose signal, extract features classify and analyze using algorithm, ultimately determine location occurrence, providing reliable basis for processing. main advantage this that it can reduce influence between signal features, impact data noise, improve accuracy detection. In experiment...

Considering the misclassification of conventional regional division based on gray level-average level-median level three-dimensional (3D) histogram, result 3D Otsu's method is not accurate enough. Its computing complexity rapidly increases due to increment another eigenvalue. Thus a fast iterative algorithm improved proposed. Based level-gradient and formulas are derived. The segmentation results, threshold running time given in experimental results analysis. A comparison made with...

Vessel classification using inverse synthetic aperture radar (ISAR) imagery is important because it can be used for maritime surveillance and has a high military value. We propose vessel algorithm based on multifeature joint matching. first utilize preprocessing method to eliminate the wakes strong sea clutter, which interfere with feature extraction. In view of different categories vessels, we then new two-dimensional scattering points encoding (SSPE2-D) recognition. Furthermore, modify...

To efficiently preserve tiny details and sharpness information of synthetic aperture radar (SAR) images while clearly remove the speckles, an improved non-local means method is proposed. Firstly, aiming at traditional patch-similarity measurement not precise using in SAR image, we define a new variable to obtain more results. Furthermore, PDF mapping function for calculating ratio distance also modified get between pixels accurate. The experimental results show that both visual quality...

This paper proposes a new speckle reduction algorithm for synthetic aperture radar images; it is based on the adaptive neighborhood window (ANW) and rotationally invariant block matching (RIBM). Firstly, we introduce RIBM into despeckling method to calculate between small patches precisely; then, aiming at limitation of rectangle (RNW), propose keeping balance suppression maintaining both point targets energy structure information. Experimental results show that proposed outperforms existing...

Single and double E-plane metal insert irises are analyzed via Mode-Match-Method (MMM), the position of is determined first, then single/double/hybrid filters designed using theory network synthesis, result demonstrates that hybrid filter easier to fabricate because its reasonable iris lengths. At last, above three types by MMM, has better transmission characteristics than single/double filter. The MMM results also verified CST software.

A new type of Substrate integrated waveg- uide end slot antenna (SIWESA) radiating from the a waveguide(SIW) at X- band is investigated with simulation and experiment in this paper. novel SIW transmission line SIWTL matching network are developed to transfer energy coaxial slot. This whole fabricated on microwave substrate standard PCB process. The simulated results single SI- WESA good agreement ones. Furthermore, 4-element array mea- sured. tested low-cost pro- cess fabrication technology...

The system of millimeter-wave synthetic aperture radar (SAR) is sensitive to the stability aircraft, and compensation motion errors key step for high squint SAR imaging. In this paper, according geometric model SAR, we analyze impact each component imaging, deduce formula instantaneous Doppler chirp rate. Furthermore, separate estimate by using rate parameters inertial navigation system, then utilize imaging algorithm correct obtain new images. results based on measured millimeter wave data...