Abstract. It is difficult to determine the direction of the motion of the image with less time to analyze the series of images taken in the camera movement at a lower resolution. In this paper, a method of L-K optical flow and S-T corner detection is proposed to study the motion direction of the field of view in the image sequence. On this basis, the weighted least squares method is used to fur...

The ultimate goal of our method is to be able to discover and track any object in any scene with minimal prior knowledge. This semester thesis focuses on a real-time implementation that uses motion and depth as cues to discover objects. More precisely, feature points are detected using the minimum eigenvalue corner detector and calculate the optical flow of these points by applying the Lucas-Ka...

Recognizing human actions is currently one of the most active research topics. Efros et al. first proposed using optical flow and normalized correlation to recognize distant actions. One weakness of the method is that optical flow is too noisy and cannot reveal the true motions; the other popular method is the space-time-interest-points proposed by Laptev et al., who extended the Harris corner ...

Numerical simulations of PTT fluids in axisymmetric sudden contractions were carried out to investigate the effect of contraction ratio on the flow patterns under conditions of negligible inertia. The PTT model selected has a linear stress coefficient, and contraction ratios (CR) in the range 4:1 to 100:1 were investigated. The simulations are based on a finite volume methodology using very fin...

We examine the bifurcation of a reflected shock in a three-dimensional, square channel through numerical simulations using a distributed memory parallel adaptive mesh refinement, Navier-Stokes solver with multicomponent equation of state and microscopic transport. The three-dimensional, rather than axisymmetric, geometry introduces considerable complexity into the flow structures, particularly ...

Of the various macro-scale continuum models of reactive flow in high-energy explosives, the ignition-and-growth model has been the most widely used. Well-resolved computational experiments with the model on corner turning in rigidly confined LX-17 demonstrate that experimentally observed dead zones (sustained regions of chemical inactivity) are not reproduced in the computations. This deficienc...

The pressure drop of refrigerant R-134a flow boiling inside a horizontal tube has been investigated experimentally. The test set-up which was used in this investigation is a well instrumented vapor compression refrigeration system. These instruments are thermocouples, flow meter, pressure gauges and the pressure drop measuring apparatus. This system consisted of three electrically heated evapor...

A computational optimization was performed for a direct-injection diesel engine using three-dimensional modeling. Fully transient CFD analyses of different valve profile strategies for the intake and compression strokes were performed to evaluate the effects on both engine performance and in-cylinder flow-field evolution. The turbulence model was used along with the second order linear upwin...

We study the classical problem of self-similar reflection of shocks at a ramp, modeled by potential flow with γ-law pressure. Depending on corner angle θ and upstream Mach number MI , either regular (RR) or Mach reflections occur. There are several conflicting transition criteria predicting the corner angle at which the type of reflection changes. We show that in some cases, in particular MI = ...