Method of and apparatus for inspecting pattern on printed board

Details Method of and apparatus for inspecting pattern on printed board Method of and apparatus for inspecting pattern on printed board

1991-11-12

1995-01-24

Trans, Vincent N.

Boots, shoes, and leggings

364488, 364552, 382 8, G06K 962, G06F 1562

Patent

active

053847113

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.

REFERENCES:
patent: 4799175 (1989-01-01), Sano et al.
patent: 5011960 (1991-04-01), Ando et al.
patent: 5214712 (1993-05-01), Yamamoto et al.
"An Automatic Inspection System for Printed Wiring Board Masks" by Goto et al., Pattern Recognitoin, vol. 12, pp. 443-455.
"An Automatic Optical Printed Circuit Inspection System" by R. C. Restrick, III, SPIE vol. 116, Solid State Imaging Devices (1977), pp. 76-81.
"Automated Optical Inspection of Multilayer Printed Circuit Boards" by W. A. Bentley, SPIE vol. 220, Optics in Metrology and Quality Assurance, 1980, pp. 102-109.
Patent Abstracts of Japan, vol. 014, No. 293 (P-1066) Jun. 25, 1990; JP A 02 091 504, Mar. 30, 1990.

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