In order to solve the impact of fast illumination change on moving object detection in a visual surveillance system, a new method of moving target detection is put forward. Through establishing illumination change model, the chromaticity difference model and brightness ratio model are used to eliminate the impact of fast illumination change. When fast illumination is changing fast, background pixels and moving object pixels are detected as foreground pixels. To separate moving object pixels and false foreground pixels from detected foreground pixels, chromaticity difference model and brightness ratio model are developed respectively to estimate the intensity difference and intensity ratio of false foreground pixels. The establishment of Chromaticity Difference Model (CDM) and Brightness Ratio Model (BRM) are based on the proposed illumination change model. The experimental results show that the method has good detection effect and real-time in the rapidly changing of illumination conditions.%为了解决视频监控系统中光照快速变化对运动目标检测产生的影响，提出一种新的运动目标检测方法。通过建立光照变化模型、色度差模型和亮度比模型来消除光照快速变化产生的影响。当光照快速变化的时候，背景像素和运动目标像素会被检测为前景像素。为了从检测到的前景像素中分离出运动目标像素和伪前景像素，分别建立色度差模型和亮度比模型来估计伪前景像素的亮度差和亮度比。色度差模型和亮度比模型的建立均依赖于光照变化模型。实验结果表明，本文的方法在光照快速变化的条件下具有较好的检测效果和检测实时性。
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