Plate glass shatter testing method, device, imaging method for glass testing and image signal processing method
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United States of America Patent
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Jul 20, 2004
Grant Date -
N/A
app pub date -
Dec 29, 1999
filing date -
Feb 19, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sheet screen is provided on one of sides of test glass, and a projected image of the test glass is electronically and directly picked up. After tone image signals of the test glass thus picked up are binarized while modifying threshold values according to brightness of a background in the tone image, the number of fragments, the area of the greatest fragment and the length of the longest fragment are calculated. Thus, operations, such as calculating the number of the fragments, can be automatically performed by directly picking up an image of the test glass, allowing a fragmentation test to be carried out with good operability and high precision.
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