提出了在摄像机运动情况下使用多层Homography匹配算法进行背景建模的方法。该方法中，场景可以被看作由多个平面所组成，使用RANSAC方法找到场景中不同的平面，即多层Homography。每个像素点肯定在某个平面上，通过所属平面相应的Homography变换，就能使相邻两帧重叠视野中的像素点进行匹配，这样就能对场景进行背景建模。实验结果表明，该方法能有效地在摄像机运动环境中进行像素点级别的背景建模。

In this paper a novel Multi-layer Homography algorithm for background modeling under free moving camera environment is proposed. Background is composed of many planes. RANSAC is used to find these different planes, called Multi-Layer Homography. Each pixel definitely belongs to certain plane. Transformed by the corresponding Homography, each pixel in each frame can find its match in the subsequent frame if it occurs in the shared view of these two frames. Thus, background model can be built. Experiment shows it is effective for background modeling under free moving camera environments.