133 top field: One of two fields that comprise a frame. Each row of a top field is spatially located immediately above the corresponding row of the bottom field.
133 top field: One of two fields that comprise a frame. Each row of a top field is spatially located immediately above the corresponding row of the bottom field.
顶场：组成一帧的一个场。顶场的每一行空间上位于对应底场所在行之上。