Method and apparatus for identification of objects
US4514622A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1981 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Jan 5, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/224
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a method and an apparatus for identifying objects, such as articles sold in a store, appearing in a random position and orientation and at random times on an image window. On a surface facing the image window, each object has an identification in the form of a field which comprises on at least one data track contrasting indicia with at least one contrasting line pattern identifying the position and the orientation of the data track. The track also includes a plurality of parallel lines with variable spacing and/or line widths. The image window is scanned line-by-line to generate a binary video signal which corresponds to the scanned contrast sequence. The length of the overlapping light and dark intervals of the video signal resulting from the scanning of the line pattern is measured and successively measured interval lengths are compared with each other and a comparison signal having a first amplitude is generated when the two interval lengths which are being compared have a predetermined ratio to each other which conforms to the spacing of corresponding pattern lines. An identification signal is emitted when during each of a number of successive comparison steps, the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.