Method of and apparatus for inspecting pattern on printed board
US5384711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1991 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Nov 12, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30141
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In order to correctly detect the width of wiring pattern on a printed board, a multiple train operator applied to image data. The multiple train operator consists of arms each having three unit arms. The binary data obtained by applying the multiple train operator to the image data is converted into a single horizontal arm and a single vertical arm. The combination of the horizontal and vertical arms corresponds to a single cross operator. The conversion into the single cross operator form is conducted through a logical operation on the binary data obtained by the multiple train operator, so that quantization errors are compensated and fine pattern defects can be detected. As a result, the width of the wiring pattern etc. are correctly obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.