说明：  力过程是整个系统的关键。激光打靶的打靶过程，由激光枪发射激光脉冲信号，光电靶接收激光脉冲信号，经过系列信号处理过程最终得到打靶的结果。光电靶由许多块的光电探测器组成，每块不同位置的光电探测器对应不同编号，从打靶的实际情况出发，确定了相应的编号规则。打靶的成
(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．)