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基于点模式匹配的芯片缺陷检测算法研究 被引量:9
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作者 刘琛 袁小芳 +1 位作者 田争鸣 王浩然 《激光杂志》 北大核心 2020年第1期39-44,共6页
针对高速与高精度场景下芯片缺陷检测实时性和准确性难以同时保证的问题,提出一种基于方位环境特征的点模式匹配定位算法(Azimuth Environment Feature Vector-Based Point Pattern Matching Localization Algorithm,AEF-PPMLA),提升检... 针对高速与高精度场景下芯片缺陷检测实时性和准确性难以同时保证的问题,提出一种基于方位环境特征的点模式匹配定位算法(Azimuth Environment Feature Vector-Based Point Pattern Matching Localization Algorithm,AEF-PPMLA),提升检测的实时性、准确性和易用性。该算法含两个部分:方位环境特征向量计算方法(Azimuthal Environment Feature Vector Calculator Method,AEF-VCM)和相似度计算方法 (Matching Degree Calculator Method,MDCM)。AEF-VCM对芯片的方位环境特征进行向量描述,减少点匹配的计算量,提高检测的实时性;MDCM采用卡方检验算法来度量特征向量的相似度,提高检测的准确度。实验部分验证算法的定位精度、耗时以及缺陷识别的准确率,结果表明所提出的AEF-PPMLA能够快速准确定位芯片并识别引脚缺陷,满足高质量生产需要。 展开更多
关键词 机器视觉 缺陷检测 芯片定位 点模式匹配 方位环境特征
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Recognition of Production and Morphological Traits in Macoei Sheep Breed
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作者 A. Lavvaf M. B. Zandi 《Journal of Agricultural Science and Technology(A)》 2011年第8期1314-1317,共4页
In this study, the data of Macoei sheep from 1994 to 2008 were collected in Affair Animal Breeding Unit, Agriculture Organization of West Azerbijan province of Iran for recognition of reproductive and morphological ch... In this study, the data of Macoei sheep from 1994 to 2008 were collected in Affair Animal Breeding Unit, Agriculture Organization of West Azerbijan province of Iran for recognition of reproductive and morphological characteristics. The trait in this research include birth weight (BW), 3 (W3), 6 (W6), 9 (W9), 12 (W12) months weight, fleece weight (WF) (as production traits), body length(BL), size of femur(F), thorax(TX), testis(TS), height of lumber(L) and shoulder(SH) (as morphological traits). Variance components, least square means and standard error of production and morphological traits were estimated and environmental factors (including effects of year of birth, season, sex, type of birth and age of dam) were studied with GLM procedure of SAS 9.1 software. The results showed that the all environmental factors have significant effect, male lambs weight more than females, and twins were more performance than single. Production and apparent performance characteristics of phenotypic traits was different in year of birth, maternal age, season. This study shows that Macoie sheep breed at the various management environment have suitable performance and genetic potential. 展开更多
关键词 Macoei sheep production and morphological traits variance component.
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