We present a geometric relationship between the image motion of pairs of points over multiple frames This relationship is based on the parallax displacements of points with respect to an arbitrary planar surface and does not involve epipolar geometry A constraint is derived over two frames for any pair of points relating their projective structure with respect to the plane based only on their i...

Image databases are often used to archive and retrieve images containing man-made 3D objects usually taken from arbitrary viewpoints. These objects generally incorporate planar surfaces containing different kinds of highly curved patterns. It is often the case that the form of such patterns characterizes well the corresponding object. Besides classical retrieval by colour or texture, the databa...

response modification factor (r-factor) is one of the seismic design parameters to consider nonlinear performance of building structures during strong earthquake. relying on this, many seismic design codes led to reduce earthquake loads imposed to the structure. the present paper tries to evaluate the r-factors of conventional concentric braced frames (cbfs) and special moment frames (mrfs) in ...

Considering the network structure is one of the new approaches in studying stochastic PERT networks (SPN). In this paper, planar networks are studied as a special class of networks. Two structural reducible mechanisms titled arc contraction and deletion are developed to convert any planar network to a series-parallel network structure. In series-parallel SPN, the completion time distribution f...

We present a geometric relationship between the image motion of pairs of points over multiple frames. This relationship is based on the parallax displacements of points with respect to an arbitrary planar surface, and does not involve epipolar geometry. A constraint is derived over two frames for any pair of points, relating their projective structure (with respect to the plane) based only on t...

This paper explores methods for Inferring motion of a cylindrical object from an image sequence. A local shading analysis method segments each Image Into spherical, cylindrical, and planar 'surfaces. The cylindrical surface Is characterized with a direction of generating lines determined from spatial derivatives In the image. An extended reflectance map method Is applicable to estimate gradient...

Hilbert frames theory have been extended to frames in Hilbert $C^*$-modules. The paper introduces equivalent $*$-frames and presents ordinary duals of a constructed $*$-frame by an adjointable and invertible operator. Also, some necessary and sufficient conditions are studied such that $*$-frames and ordinary duals or operator duals of another $*$-frames are equivalent under these conditions. W...

in this study, for evaluating ductility of ordinary concentrically braced frames (ocbfs) and special concentrically braced frames (scbfs) which are x- braced in two adjacent middle spans, 16 steel ordinary concentrically braced frames and 16 special concentrically braced frames are studied. the results confirm that, although most of ordinary concentrically braced frames, which are x-braced, can...