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Title:
METHOD FOR DETECTING POSITION OF X-Y SYMMETRICAL BODY
Document Type and Number:
Japanese Patent JPS5743279
Kind Code:
A
Abstract:

PURPOSE: To quickly detect the central position and rotating position of a X-Y symmetrical body, by reducing number of the scanning line to be used as much as possible.

CONSTITUTION: Known dimensions (a,b) which are used for performing centering are extracted from a computer 6 and put in a monitor 13. At first, data of an address Y0 are sampled and whether a body of known dimension exists or not is detected. When any body is not detected, the sampling is repeated by changing the address. When a body 10 is detected, the center between the left and right edges is obtained. Then, the center between the upper and lower edges is obtained. By repeating several times such procedure, a difference with the objective point P0 can be detected. By giving this difference information to a controller 14 and by moving a stage 8 in X and Y directions, the center point of a chip 10 is coincided to the center point of a data sampling area 20. When edges of the body is detected at addresses yn-θA, yn+θA, at both sides of a n-th center point Pn, a correction value of the angle can be calculated from each difference.


Inventors:
SATOU TAKASHI
SHIMADA ISAMU
Application Number:
JP1980000119082
Publication Date:
March 11, 1982
Filing Date:
August 29, 1980
Export Citation:
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Assignee:
FUJITSU LTD
International Classes:
G06T1/00; G01B11/00; G01B11/02; G06T7/60; (IPC1-7): G06F15/20; G06K9/62
Domestic Patent References:
JPS5142557A1976-04-10
JPS5533220A1980-03-08



 
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