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An Adaptive Image calibration algorithm for Steganalysis

Computers, Materials & Continua 2020年第2期62卷 963-976页

作者： Xuyu Xiang Jiaohua Qin Junshan Tan Neal N.Xiong 无 College of Computer Science and Information Technology Central South University of Forestry&TechnologyChangsha410114China Department of Mathematics and Computer Science Northeastern State UniversityOK74464USA

In this paper,a new adaptive calibration algorithm for image steganalysis is *** disturbs the dependence between neighboring pixels and decreases the neighborhood node ***,we analyzed the effect of steganography on the neighborhood node degree of cover ***,the calibratable pixels are marked by the analysis of neighborhood node ***,the strong correlation calibration image is constructed by revising the calibratable *** results reveal that compared with secondary steganography the image calibration method significantly increased the detection accuracy for LSB matching steganography on low embedding *** proposed method also has a better performance against spatial steganography.

关键词： calibration algorithm neighborhood node degree ordinary pixel sensitive pixel steganalysis

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Dynamic Accuracy Analysis of a 5PSS/UPU Parallel Mechanism Based on Rigid-Flexible Coupled Modeling

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Chinese Journal of Mechanical Engineering 2022年第2期35卷 77-90页

作者： Yanbiao Li Zesheng Wang Chaoqun Chen Taotao Xu Bo Chen College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China Key Laboratory of E&M Ministry of Education&Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310023China

In order to improve the low output accuracy caused by the elastic deformations of the branch chains,a finite element-based dynamic accuracy analysis method for parallel mechanisms is proposed in this ***,taking a 5-prismatic-spherical-spherical(PSS)/universal-prismatic-universal(UPU)parallel mechanism as an example,the error model is established by a closed vector chain method,while its influence on the dynamic accuracy of the parallel mechanism is analyzed through numerical *** to the structural and error characteristics of the parallel mechanism,a vector calibration algorithm is proposed to reduce the position and pose errors along the whole motion ***,considering the elastic deformation of the rod,the rigid-flexible coupling dynamic equations of each component are established by combining the finite element method with the Lagrange *** elastodynamic model of the whole machine is obtained based on the constraint condition of each moving part,and the correctness of the model is verified by ***,the effect of component flexibility on the dimensionless root mean square error of the displacement,velocity and acceleration of the moving platform is investigated by using a Newmark method,and the mapping relationship of these dimensionless root mean square errors to dynamic accuracy is further *** research work provides a theoretical basis for the design of the parameter size of the prototype.

关键词： Parallel mechanism Geometric error calibration algorithm Elastodynamic model Dynamic accuracy

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FY-3C中分辨率光谱成像仪在轨红外辐射定标分析

FY-3C中分辨率光谱成像仪在轨红外辐射定标分析

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2016年红外、遥感技术与应用研讨会暨交叉学科论坛

作者：赵其昌代海山王冲杨勇杨春燕郭玲玲上海卫星工程研究所

利用星载高精度黑体对遥感仪器的红外通道进行辐射定标是常用的定标方法。本文介绍了中分辨率光谱成像仪在轨红外辐射定标原理,利用仪器每个扫描周期独立获取冷空间和内部黑体计数值,进行红外通道在轨定标计算。重点论述了红外辐射定标... 详细信息

利用星载高精度黑体对遥感仪器的红外通道进行辐射定标是常用的定标方法。本文介绍了中分辨率光谱成像仪在轨红外辐射定标原理,利用仪器每个扫描周期独立获取冷空间和内部黑体计数值,进行红外通道在轨定标计算。重点论述了红外辐射定标算法,并对定标结果进行分析。

关键词： Medium Resolution Spectral Imager infrared radiometric calibration algorithm

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