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Title:
DEVICE AND METHOD FOR DETECTING SURFACE SCRATCH OF INSPECTION OBJECT
Document Type and Number:
Japanese Patent JP2711643
Kind Code:
B2
Abstract:

PURPOSE: To surely judge a scratch including a small scratch of an inspection object in a surface scratch detection device using an image processing device using brightness histogram.
CONSTITUTION: A surface scratch detection device is provided with a brightness measuring part 6 for measuring the brightness level for each picture element of image data, an image memory part 7 for recording the brightness level for each picture element as picture element data, a plurality of brightness setting parts 12, 13, and 14 for setting and storing the range of a brightness level in advance, a plurality of brightness counting parts 9, 10, and 11 for calculating the number of picture elements within the range of a brightness level stored at each of a plurality of brightness setting parts out of the picture element data inputted from the image memory part, and a judgment part 15 for judging the presence or absence of the surface scratch of an inspection target based on the number of picture elements which are calculated by each of a plurality of brightness counting parts.


Inventors:
Masaaki Yasumoto
Keiji Taniguchi
Nakajima Yasuyasu
Application Number:
JP1877795A
Publication Date:
February 10, 1998
Filing Date:
January 12, 1995
Export Citation:
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Assignee:
Fujikoshi Co., Ltd.
Keiji Taniguchi
International Classes:
G01N21/88; G06T1/00; G06T7/00; (IPC1-7): G01N21/88; G06T7/00
Domestic Patent References:
JP5164703A
JP4147044A
JP3160349A
JP62209306A
JP2103214U
Attorney, Agent or Firm:
Junji Kawauchi