煤岩自动测试系统图像灰度与反射率关系研究  

RELATIONSHIP BETWEEN GRAY VALUE OF IMAGES AND REFLECTANCE IN AUTOMATIC COAL PETROGRAPHY

作　　者：王越[1] 白向飞[1] 张宇宏[1] 陈洪博[1] 武琳琳[1] 

机构地区：[1]煤炭科学研究总院北京煤化工研究分院,国家能源煤炭高效利用与节能减排技术装备重点实验室,北京硕士助理工程师100013

出　　处：《煤炭转化》2014年第2期25-27,32,共4页Coal Conversion

摘　　要：图像灰度与反射率之间的关系是利用图像分析法进行煤岩自动测试时首先需要解决的问题.通过理论分析和反射率标准物质实验研究两者关系,并确定图像分析法测试的适宜光照条件,最后对图像分析法测试与光度计法测试的工作曲线及测试精度进行对比.理论分析和实验研究均表明图像灰度与反射率间存在线性关系,线性相关度很高;拟合直线的相关度在较宽的光照范围内接近1,线性相关度随视域缩小而变高;图像分析法可以达到光度计法同样的测试精度.The primary issue of automatic coal petrography using image analysis method is to determine the relationship between gray value of images and the reflectance.A theoretical approach was made to analyze the relationship followed by experiments using standard materials.The suitable illumination conditions were also studied.Finally comparisons of working curves and precision between image analysis method and microscope photometer method were conducted.A linear correlation and a high degree of linear correlation coefficient had been found between gray value of images and the reflectance by both theoretical and experimental methods.The degree of linear correlation was close to 1 in a wide illumination range and the smaller the field stop was,the better the degree of linear correlation.The precision of image analysis method could match that of the traditional one.

关 键 词：煤岩 自动测试 图像分析 线性相关度 

分 类 号：TQ531.2[化学工程—煤化学工程] TP751[自动化与计算机技术—检测技术与自动化装置]