摘要
为了达到自动控制光源、保障测量精度的目的,研究了视觉检测系统中不同光源照明方式与照度对图像质量的影响规律,探明了图像质量与测量精度的内在关系.通过实验,对不同照明方式下的图像质量评价系统进行了建模,并提出了一种评价图像质量的方法,即在透射照明方式下,以图像对比度为评价指标;在反射照明方式下,以图像低频分量比为评价指标,通过计算图像对比度和低频分量比是否达到一定阈值来评价图像质量,并以此控制光源照度,保证测量精度在允许范围.
This paper studied the influence law of image quality caused by different illumination methods and lighting intensity, proved the internal relationship between image quality and measuring accuracy. In order to control the lighting source automatically and ensure the measuring accuracy, the paper modeled the image quality assessment system under different illumination conditions and proposed a method to evaluate the image quality. That is, under the back light illumination, using the image contrast as the criterion while under the front light illumination, using the low frequency ratio as the criterion to evaluate the image quality. Through adjusting the contrast and low frequency ratio, the image quality can be controlled and the measuring accuracy can be satisfied.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2009年第6期931-934,939,共5页
Journal of Shanghai Jiaotong University
关键词
视觉检测
照明光源
照度
图像质量
测量精度
visual detection
lighting source
intensity
image quality
measuring accuracy
