A region-based matching approach is proposed for image correspondence of two images of the same scene but taken from different viewpoints. This approach consists of a matching stage and a validating and correcting stage. In the first stage, a local ternary relation among regions is used together with chromatic features of regions to establish region correspondences. In the second stage, the opt...

Optical flow has been commonly defined as the apparent motion of image brightness patterns in an image sequence. In this paper, we propose a revised definition to overcome shortcomings in interpreting optical flow merely as a geometric transformation field. The new definition is a complete representation of geometric and radiometric variations in dynamic imagery. We argue that this is more cons...

A new non-rigid registration method combining image intensity and a priori shape knowledge of the objects in the image is proposed. This method, based on optical flow theory, uses a topology correction strategy to prevent topological changes of the deformed objects and the a priori shape knowledge to keep the object shapes during the deformation process. Advantages of the method over classical ...

Flies that walk in a covered planar arena on straight paths avoid colliding with each other, but which of the two flies stops is not random. High-throughput video observations, coupled with dedicated experiments with controlled robot flies have revealed that flies utilize the type of optic flow on their retina as a determinant of who should stop, a strategy also used by ship captains to determi...

We use optical flow to extract reliable kinematics from video for motions of the head, face, torso, and hands during speech and musical performance. Unlike dotand markerbased measures, these markerless measures are non-invasive and require no a priori specification of measurement locations. Reliability is compared with marker tracking data and the method’s utility is demonstrated for data from ...

Research on the interpretation of image flow (or optical flow) until now has mainly focused on instantaneous flow fields. This limits the scope of the problems that one can address and the accuracy of the results. Here we extend a previous formulation of the problem to incorporate temporal variation of image flow. We illustrate our approach by solving specific cases which are of practical signi...

The optic ow eld is deened as preserving the intensity along ow-lines. Due to singularities in the image at xed time, poles are created in the optic ow eld. In this paper we describe the generic types of ow singularities and their generic interaction over time. In a general analytic ow eld, normally the topology is characterised by the points where the ow vanish again subdivided into repellers,...

This paper offers a novel means of segmenting independently moving objects from rigid backgrounds. The camera motion can be arbitrary with the proviso that independently moving objects are not moving parallel to it. A new method of treating visual motion is presented. The method relies on describing the motion of points in the world in terms of their angular velocity relative to the camera. In ...