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北航研究生网络安全防护讲义，内容丰富，参考了国外的大量资料-Beihang University graduate network security protection notes, rich in content, with reference to the wealth of information overseas

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This paper introduces an affine invariant of trapezia, and the explicit constraint equation between the intrinsic matrix of a camera and the similarity invariants of a trapezium are established using the affine invariant. By this constraint, the inner parameters, motion parameters of the cameras and the similarity invariants of trapezia can be linearly determined using some prior knowledge on the cameras or the trapezia. The proposed algorithms have wide applicability since parallel lines are not rare in many scenes. Experimental results validate the proposed approaches. This work presents a unifying framework based on the parallelism constraint, and the previous methods based on the parallelograms or the parallelepipeds can be integrated into this framework. Key words: invariant parallelism constraint camera calibration 3D reconstruction

提出了汽车防盗及呼救系统的解决方案，通过采用嵌入式系统，实现GPS/GSM集成模块。-Proposed car alarm and SOS systems solutions through the use of embedded systems to achieve GPS/GSM-integrated modules.

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