Accurate particle position measurement from images

Accurate particle position measurement from images.

The moment method is an image analysis technique for subpixel estimation of particle positions. The total error in the calculated particle position includes effects of pixel locking and random noise in each pixel. Pixel locking, also known as peak locking, is an artifact where calculated particle positions are concentrated at certain locations relative to pixel edges. We report simulations to g...

Accurate Position Tracking Using Inertial Measurement Units

Accurate Angle-of-Arrival Measurement Using Particle Swarm Optimization

As one of the major methods for location positioning, angle-of-arrival (AOA) estimation is a significant technology in radar, sonar, radio astronomy, and mobile communications. AOA measurements can be exploited to locate mobile units, enhance communication efficiency and network capacity, and support location-aided routing, dynamic network management, and many location-based services. In this p...

3D Particle Position Measurement via the Defocusing Concept

This paper presents a 3D particle position measurement method based on the defocusing concept introduced by A.Pentland with a single camera. Different from the existing approaches, the blur circle is used to identify the blur extent for various defocused particles, and the depth-blur relation is formulated by the modified A.Pentland mathematical formula. And, an eight-step algorithm based on Ci...

Accurate Correspondences From Epipolar Plane Images

We present an algorithm for finding correspondences in epipolar plane images (EPIs). An EPI is a 2-dimensional spatio-temporal image obtained from a dense image sequence that is rectified so that each scene point is projected to the same row in all frames. Scenes with opaque Lambertian surfaces without occlusions are assumed. The approach is based on finding lines with similar intensities in an...