Method and apparatus of determining the center of area or centroid of a geometrical area of unspecified shape lying in a larger x-y scan field
US4219847A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1979 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Feb 22, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/66
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of obtaining on-line data useful in determining the center of area or centroid of a geometrical area of unspecified shape lying in a larger x-y scan field and having its existence indicated by a level discriminated amplitude or intensity or a parameter measurable in the z-dimension comprising; scanning the x-y field in a known raster pattern and obtaining a series of discrete output voltage pulses related to elemental x-y points in the scan field and having an amplitude related to the amplitude or intensity of the said parameter; generating a series of discrete clock pulses related to elemental x-y points in the scan field; obtaining a series of x and y synchronizing pulses from and related to the x-y scan field; establishing in relation to the clock pulses and the x and y synchronizing pulses a smaller x-y scan field in the form of a rectangular window around the geometrical area in the larger x-y scan field, the boundaries as x-y co-ordinates of the said window being known; identifying, from the series of discrete clock pulses, those pulses that coincide with pulses obtained above having an amplitude above a preset voltage level and which fall within the boundaries of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.