摘要
白平衡是数码相机数字图像处理的重要一环。为了研究拍摄色温对基于HDR图像处理技术的亮度测量方法的影响,从色温与M矩阵的关系出发,在使用荧光灯照明的某地下车库进行实验,随机选取6个柱面上15个点,利用该方法测量亮度。将实验结果与文献中采用未修正公式得出的结果进行对比,后者误差远远大于前者。研究表明,利用该方法测量亮度时,有必要根据拍摄环境的色温对M矩阵进行修正;实验相对误差小于10%,满足工程测量应用需要。
White balance is an integral part of the digital image processing of digital camera. In order to study the influence of color temperature on the luminance measurement method based on high-dynamic range （HDR） image processing technology, this paper introduces the relationship between color temperature and M -matrix at first. The experiment is taken in an underground garage with fluorescent lamp illuminating. The luminance of 15 points randomly located on 6 column surfaces is measured by above method. Comparing the experiment results with those getting from the formula in a literature without correction according to the color temperature, the error of the latter is much larger than that of the former. The experiment result shows that it is necessary to amend the M -matrix according to the color temperature of the shooting conditions when using this method for brightness measurement. The relative error of experiment is less than 10%, meeting the requirement of engineering measurement.
出处
《后勤工程学院学报》
2012年第6期78-84,共7页
Journal of Logistical Engineering University
关键词
亮度测量
高动态范围
色温
M矩阵
brightness measurement
high-dynamic range
color temperature
M -matrix
