Because of the new concept of VOP,MPEG-4 provides the manipulation of video object. One VOP is one semantic object with the attribute of shape,texture and motion. Among them shape coding is the main difference between MPEG-4 and the traditional standard.

• 标准中引入了视频对象平面(VOP)的概念；每个VOP即是一个语义意义上的对象或感兴趣的对象内容；VOP具有形状、纹理和运动三种属性；其中形状编码是MPEG-4与传统视频编码标准的最大区别.