Mac层帧结构。介质访问控制层(MAC)帧被称为MAC协议数据单元(MPDU)，其长度不超过127个字节。它具有四种不同的帧形式，即信标帧、数据帧、确认帧和命令帧。-Mac layer frame structure. MAC layer (MAC) frame is called MAC Protocol Data Unit (MPDU), whose length does not exceed 127 bytes. It has four different forms of frames

these codes are by c++ and open cv, i think they can find lines, make them thin and maybe they can find a specific frame for you