Image processing for launch parameters measurement of objects in flight
US9171211B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2013 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Jun 5, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P21/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An example embodiment includes a method of measuring launch parameters of an object in flight. The method includes capturing images of an object in flight. A radius of the object and a center of the object are identified in each of the images. A velocity, an elevation angle, and an azimuth angle are calculated based on the radius of the object, the center of the object, and pre-measured camera alignment values. The method further includes cropping the images to a smallest square that bounds the object and flattening the images from spherical representations to Cartesian representations. The method also includes converting the Cartesian representations to polar coordinates with a range of candidate centers of rotations. Based on a fit of the polar image pair, the spin axis and spin rate are measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.