定义一个物体边界的方向序列。的英文

boundary chain code

• 定义:    definition; delimi ...
• 一个:    one; a; an
• 物体:    body; substance; o ...
• 边界:    boundary; frontier ...
• 的:    4次方是 The fourth po ...
• 方向:    direction; orienta ...
• 序列:    order; alignment; ...