A Pipelined Real-time Optical Flow Algorithm – p.1/14

In this paper, we address the topic of estimating two-frame dense optical flow from the monogenic curvature tensor. The monogenic curvature tensor is a novel image model, from which local phases of image structures can be obtained in a multi-scale way. We adapt the combined local and global (CLG) optical flow estimation approach to our framework. In this way, the intensity constraint equation i...

Optical Flow Methods for the Registration of Compressible Flow Images and Images Containing Large Voxel Displacements or Artifacts

In order for visual feedback systems to have quick response, an image sequence captured at a much higher frame rate than the video rate has recently been employed. However, when optical flow, which is often used for visionbased control, is computed by the conventional methods using such an image sequence, the result contains significant error because there is almost no variance between any two ...

We describe a system for analyzing human driver alertness. It relies on optical flow and color predicates to robustly track a person’s head and facial features. Our system classifies rotation in all viewing directions, detects eye/mouth occlusion, detects eye blinking, and recovers the 3D gaze of the eyes. We show results and discuss how this system can be used for monitoring driver alertness.

This paper presents a set of novel features for classifying basketball video clips into semantic events and a simple way to use prior temporal context information to improve the accuracy of classification. Specifically, the feature set consists of a motion descriptor, motion histogram, entropy of the histogram and texture. The motion descriptor is defined based on a set of primitive motion patt...

There is an increasing interests in micro-expression researches. Spotting micro-expressions in long-term videos is very important, not only for providing clues for lie detection, but also for reducing the labor required to collect micro-expression data. However, little progress has been made in spotting micro-expressions. In this paper, we propose a Main Directional Maximal Difference (MDMD) An...

Through alteration of the structure of a colorimetric resonant optical biosensor, the relative contribution of surface-binding effects to bulk refractive index effects can be influenced to favor detection of material in direct proximity to the sensor surface structure. The sequential buildup of polyelectrolyte monolayers has been used as a characterization method for determining the sensitivity...