CCD甄别成形过程中玻璃包装制品的衰减照明光方法  

Method of Decreasing Background Light Intensity in Discriminating Glass Packaging Product in Forming Process by CCD

作　　者：尹中会[1,2] 李春[1] 

机构地区：[1]上海理工大学,上海200093 [2]安徽理工大学,淮南232001

出　　处：《包装工程》2014年第5期97-101,共5页Packaging Engineering

基　　金：上海市重点学科建设资助项目(J50501)

摘　　要：目的为了满足CCD对成形过程中玻璃包装制品的在线边界甄别条件,进而对其进行在线尺寸测量。方法采用高温目标辐射光谱功率分布理论和Matlab数值积分方法,研究不同背景照明系数条件下CCD对高温玻璃包装制品和其周围背景的辐照响应。结果导出了背景照明系数与CCD图像中高温玻璃包装制品和其周围背景的灰度差之间的函数关系和曲线,随着照明光衰减系数值的不断减小,高温玻璃包装制品和其周围背景的灰度差不断增大,当灰度差为0时存在临界值。以阳光照明为例,导出了其临界衰减系数与高温玻璃温度之间的关系,高温玻璃温度为900 K时的临界值为1.6351×10-8。结论背景照明系数必须小于其临界值,才能满足其灰度差大于0的在线边界甄别条件,且背景照明系数值越小甄别效果越好,进而提出采用衰减照明光的方法来实现成形过程中玻璃包装制品的CCD甄别。Objective To satisfy the discrimination condition of the glass packaging product in forming process by CCD and provide basis for its size measurement. Methods The monochrome irradiation response of the CCD to the glass packaging prod- uct and its surrounding scenery in different attenuation coefficient of the background light by the high temperature target radia- tion spectral power distribution theory and the Matlab numerical integration were studied. Results The functional relationship and curves between the gray difference between the high temperature glass packaging product and its surrounding scenery in CCD image and the attenuation coefficient of the background light were found. The gray difference increased as the attenuation coefficient decreased continuously and the critical value of the attenuation coefficient existed when the gray difference equaled zero. With the sunlight as an example, the relationship between the critical attenuation coefficient and the glass temperature was obtained and the critical value of the attenuation coefficient was 1. 6351× 10-8 when the glass temperature was 900 K. Con- clusion The discrimination condition of the gray difference greater than zero could be satisfied only when the attenuation coeffi- cient of the background light was smaller than its critical value and the smaller the attenuation coefficient was, the better the discriminating effectiveness. It was presented that the method of decreasing background light intensity could be used to realize the discrimination of the glass packaging product in forming process by CCD.

关 键 词：玻璃包装制品 CCD 甄别 衰减系数 灰度差 

分 类 号：TB484.5[一般工业技术—包装工程]