Device for testing an image of a test object

Details Device for testing an image of a test object Device for testing an image of a test object

1994-11-15

1997-03-04

Couso, Jose L.

Image analysis

Applications

Manufacturing or product inspection

382272, 382274, 250223B, 348127, G06K 900

Patent

active

056088159

ABSTRACT:
An image testing device captures an image of a test object using a TV camera and raster-scans the image to search the test object for a scratch or spot. The device protects its test precision from being deteriorated by lowered brightness of an illuminator and properly maintains the illuminator by outputting an alarm on detecting a lowering of the illuminator. To realize the capabilities of the image testing device, it comprises a brightness measure circuit, a general determination circuit, etc. The brightness measure circuit receives a multivalued gray image signal or image data from the frame memory through a switching unit, obtains an average value of picture elements in a brightness measure area in a test object image, and outputs it as a measured brightness signal. The general determination circuit corrects, in proportion to a measured brightness a binarization threshold for use in detecting a picture element indicating a defect. When the measured brightness is smaller than its threshold more frequently than a predetermined number of times, the general determination circuit outputs an abnormal brightness occurrence signal.

REFERENCES:
patent: 4827351 (1989-05-01), Sakamoto
patent: 4972393 (1990-11-01), Cochran et al.
patent: 5233199 (1993-08-01), Toyama
patent: 5268773 (1993-12-01), Park et al.
patent: 5305391 (1994-04-01), Gomibuchi

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