We consider a non-intrusive computer-vision method for measuring the motion of a person performing natural signing in video recordings. The quality and usefulness of the method is compared to a traditional marker-based motion capture set-up. The accuracy of descriptors extracted from video footage is assessed qualitatively in the context of sign language analysis by examining if the shape of th...

Motion can be perceived either through low-level, motion-energy detection or through tracking the change in position of features. Previously we have shown that, while luminance-based motion likely is detected with velocity-sensitive motion-energy units, patterns defined by texture or binocular disparity ('second-order' stimuli) were tracked by a position-sensitive mechanism (Seiffert & Cavanagh...

Ocular following responses (OFRs) were elicited in monkeys at short latencies ( approximately 50ms) by applying motion in the form of successive 1/4-wavelength steps to each of two overlapping vertical sine-wave gratings that had different spatial frequencies. In the first experiment, the two sine waves had spatial frequencies in the ratio 3:5 and moved in opposite directions. The initial OFRs ...

This technical report is the documentation of a survey within computer vision-based human motion capture. The idea with this report is to present previous work in a structural manner using taxonomies at di erent levels. The report is structured in the following way. The rst chapter gives an introduction to new types of interfaces where one class is known as the "Looking at People" domain. Withi...

It is necessary for the system such as the robotics vision and the monitoring camera to detect the motion of the object and recognize the target in real time. However, this is difficult in conventional image processing systems constructed with a charge coupled device (CCD) camera and Neumann-type computer since information processing in this setup is accomplished in a time-sequential way. On th...

In robot navigation, one of the important and fundamental issues is to reconstruct positions of landmarks or vision sensors locating around the robot. This paper proposes a method for reconstructing qualitative positions of multiple vision sensors from qualitative information observed by the vision sensors, i.e., motion directions of moving objects. The process iterates the following steps: (1)...

This paper describes the vision module from the soccer playing robots of the Dutch Team. Fast vision is necessary to get a close coupling with the motion software in order to allow fast turning and dribbling with the ball without loosing it. Accurate vision is necessary for the determination of the robot's position in the field and the accurate estimation of the ball position. Both fast and acc...

The sense of equilibrium is influenced by various factors of visual stimulation, especially far peripheral vision and a motion parallax. An investigation of these two factors was made in order to apply the findings to construct a rehabilitation method for equilibrium disorders. From the experimental results, it was found that the center of gravity for the subjects was greatly affected by both f...

This paper describes the “motion” properties of the ambiyopic fovea and compares them to the normal periphery. Specifically, thresholds for defection of the displacement of a grating pattern, and for discrimination of displacement direction were measured. The main findings of these experiments were: (I) in the central vision of both normal and amblyopic observers, unreferenced displacements are...

A vision-based approach to the motion control of pneumatic group actuators is presented. Sensing of plate locations consisting of the pneumatic group actuator is essential to cope with the variation of elastic tubes of the actuator. Plate locations are measured by a vision system and the motion of the actuator is controlled using a roughly identified relationship between air pressure imposed on...