发明名称 |
Optimized lighting method for slider serial reading using class variance |
摘要 |
Embodiments of the invention provide a method for setting a light source parameter in order to recognize an identification mark on an object surface. In one embodiment, a grayscale image is generated by setting the light volume of the light source to a given value. Plural thresholds each for binarizing the grayscale image in density are set. The inter-class variance values to be produced respectively according to the thresholds are calculated and the largest inter-class variance value is selected as the peak inter-class variance value from the inter-class variance values calculated. The light volume is changed to a plurality of different values. Peak inter-class variance values are obtained respectively for the values and the largest peak inter-class variance value is selected as the maximum inter-class variance value from the peak inter-class variance values obtained. The object surface is irradiated by the light source whose light volume is set to a value which would give the maximum inter-class variance value.
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申请公布号 |
US2006126934(A1) |
申请公布日期 |
2006.06.15 |
申请号 |
US20050303784 |
申请日期 |
2005.12.15 |
申请人 |
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. |
发明人 |
ICHIMURA YOHTAROH;IWASA SHINICHI;ERIKAWA TAKAYUKI;NAKAMURA YUKIHIRO |
分类号 |
G06K9/00;G06K9/38 |
主分类号 |
G06K9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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