一种适应户外光照变化的背景建模及目标检测方法

Background Modeling Adaptive to Outdoor Illumination Variation and Foreground Detection Approach

针对户外视频监控存在光照变化这一问题,提出一个用于准确完成目标检测的实时背景建模框架.考虑到目标检测的准确性要求,建立基于帧间像素亮度差统计直方图的像素亮度扰动阈值.在此基础上,针对背景建模的实时性要求,提出一种基于自回归背景模型的参数快速更新方法.鉴于不同光照变化的适应性要求,定义对光照变化不敏感的背景纹理模型.上述模型统称为自回归–纹理(Auto regression and texture,ART)模型,该模型适应于户外光照变化.基于该模型构建像素亮度和纹理置信区间用于目标检测.实验结果表明,该框架能适应和实时跟踪户外背景的光照变化,并对目标进行准确检测.

Considering the appearance of illumination variation in outdoor video surveillance, a real-time background modeling framework, which is also composed of accurate foreground detection, is established. In view of the accuracy of foreground detection, a threshold based on the histogram of pixells intensity difference between neighboring frames is proposed. On account of the real-time background modeling, a fast estimation approach on parameters of autoregressive model is presented. Considering the adaptability to variable illumination, a texture background model insensitive to outdoor illumination variation is designed. Thus, a uniform model named auto regression and texture （ART） is obtained. According to the established confidence intervals with perturbation of pixel＇s intensity and its local texture, foreground in scenes with different illumination variations is successfully detected. The experimental results indicate that the framework is adaptive to and can exactly track outdoor illumination variation in real time. Moreover, foreground detection is successfully accomplished.