Method and apparatus for analyzing a body having a marker located thereon
US5072294A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1991 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Feb 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/245
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A video motion analysis system wherein a camera converts an image of a body having illuminated markers placed thereon into a plurality of image frames. Each image frame comprises a plurality of image lines, and each image line comprises a plurality of pixels. An image preprocessor receives the plurality of image lines and detects the occurrence of each marker in each image line. This is done by comparing each pixel amplitude value to a threshold value and indicating when the pixel amplitude value exceeds the threshold value. When a pixel amplitude value exceeds the threshold value, an offset value representing the difference between the pixel amplitude value and the threshold value is added to a running total of amplitude values for the detected marker. Similarly, the offset value is used to calculate the moment value for each pixel in each marker based on the position of the pixel in the scan line. The calculated moment value is added to a running total of moment values for the detected marker. The amplitude and moment sums for each series of pixels for each marker in each image line are passed to a signal processor which groups the amplitude and moment sums for each marker togeth…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.