号由光电探测器检测后传送到相应的放大电路，放大电路采用集成运算放大器。按原先对光电探测器的编码规则采用多路优先编码器对信号进行编码。最后把编码值以串口的形式传送到计算机，利用计算机的强大功能对打靶结果进行各种处理。与计算机之间的串行数据传输由89C2051单片机实现。89C2051单片机的程序，使用keil编译器进行设计和调试完成，其主要功能是控制数据的串行传送，实现与计算机的串口通信。

该信号处理系统实现了对信号的-counting ceHs manually，live cells are recognized and counted automatically by image-analyzing

technique．Two methods are used to segment two different kinds of cell images respectively．One

method is based on background fitting to the gray of original cell image and the other on a local histogram．

Then the parameters of every cell Call be obmined by tracking a segmented image by chain code．

With these parameters，all cells in a cell image are tracked and counted quickly and efficiently．