Abstract: Environment matting and compositing is a technique to extract a foreground object，including color，opacity，reflective and refractive properties from a real-world scene and synthesize new images by placing it into new environments.The description of the captured object is named environment matte.Recent matting and compositing techniques can produce quite realistic images for objects with complex optical properties.The paper presents an approximate method to transform the matte by simulating variations of the foreground object’s depth，and proposes the changes of matting data when the distance between the foreground object and the camera is changed.The method can be used in synthesizing dynamic environment matting in random motions.

摘要： 环境遮片的提取与合成是指从图像中抽取前景物体，包括物体的颜色及光线的折射、反射情况，并将其合成在新的场景中。提取出的前景图像数据称为环境遮片。目前的环境遮片技术能够从真实场景中得到复杂的光学特征。提出了一种近似算法，用于直接处理生成的环境遮片数据，以模拟物体发生深度变化时环境遮片数据的变化情况，并给出了当物体-摄像机距离发生变化时遮片数据变化的情况。该方法可用于合成在物体发生相对复杂的运动时的动态环境遮片效果。