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皮棉杂质透射检测及成像目标增强方法

郏东耀 丁天怀

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皮棉杂质透射检测及成像目标增强方法

郏东耀, 丁天怀

A method for transmitted detection of lint trash and imaging target enhancement

Jia Dong-Yao, Ding Tian-Huai
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  • 由于皮棉中白色或无色的杂质与皮棉反射特性相似,现有的光谱反射成像检测方法具有一定 的局限性.对皮棉杂质的光透射成像检测方法进行深入研究.在分析杂质及棉纤维透射特性基 础上,建立了光透射成像机理模型.研究了光透射成像系统中光源种类、光源能量、棉层厚 度及皮棉运动速度对成像目标的影响.根据棉层中透射光子的传播特性,提出利用高速CCD俘 获非漫射光子及统计滤波处理方法以增强成像目标,并分析了高速CCD曝光时间与成像目标 清晰度的量化关系.结果表明,所提出的光透射检测及成像目标增强方法,可获得清晰的目 标图像特征,检测结果与实际相符,此方法不仅为检测皮棉中各种白色或无色杂质提供一种 有效途径, 而且还可推广到红外及其他波段的成像系统中,对于微弱目标的透射成像检测 提供一种新的思路.
    Present methods using spectral reflected imaging for detection of lint trash suf fer from some fundamental limitation because the trash almost has the same refl ected characteristic as the lint. To effectively detect the trash in lint, a met hod using transmitted imaging technique was proposed and the experimental pheno menon was analyzed in detail. The transmitted imaging model was constructed bas ed on analyzing the trash and lint absorption characteristics. And the impacts o n imaging target by the type and energy of light source as well as thickness an d velocity of lint movement were also discussed. After analyzing the transmitted photo propagation characteristic, a method of capturing non-diffuse photo using high-speed CCD and statistic filtering processing was developed for enhancement of the imaging target. Furthermore, the relation between the exposure time of high-speed CCD and the target distinctness was determined. The result indicated that the method is effective to acquire a distinct target image using the transmitted imaging detection and imaging target enhancement. And the image is consistent with the actual target. This method not only can provide an effective way to detect the white and colorless trash in cotton, but also can be applied to other imaging system such as the infrared and other band spectral imaging. It is believed that this weak target transmitted imaging system is an effective way to detect wcak target.
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  • 文章访问数:  4410
  • PDF下载量:  1048
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出版历程
  • 收稿日期:  2004-11-08
  • 修回日期:  2004-12-13
  • 刊出日期:  2005-09-20

皮棉杂质透射检测及成像目标增强方法

  • 1. (1)清华大学精密仪器与机械学系,北京 100084; (2)清华大学深圳研究生院,深圳 510000

摘要: 由于皮棉中白色或无色的杂质与皮棉反射特性相似,现有的光谱反射成像检测方法具有一定 的局限性.对皮棉杂质的光透射成像检测方法进行深入研究.在分析杂质及棉纤维透射特性基 础上,建立了光透射成像机理模型.研究了光透射成像系统中光源种类、光源能量、棉层厚 度及皮棉运动速度对成像目标的影响.根据棉层中透射光子的传播特性,提出利用高速CCD俘 获非漫射光子及统计滤波处理方法以增强成像目标,并分析了高速CCD曝光时间与成像目标 清晰度的量化关系.结果表明,所提出的光透射检测及成像目标增强方法,可获得清晰的目 标图像特征,检测结果与实际相符,此方法不仅为检测皮棉中各种白色或无色杂质提供一种 有效途径, 而且还可推广到红外及其他波段的成像系统中,对于微弱目标的透射成像检测 提供一种新的思路.

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