一种快速CCD目标定位方法

重心法是一种高精度的CCD像点位置提取算法 ,但由于数据量大 ,响应速度较慢 ,不适于要求实时响应的数字摄影测量系统。本文提出一种方法 :利用模数混和硬件电路对CCD图像进行预处理 ,从中只获取高于阈值的目标信号 ,再结合目标识别及定位算法确定目标像点的重心 ,使数据处理量大大减小 ,能够满足实时摄影测量的要求。

An approach to fast CCD target location

Centroid algorithm is a high accuracy method to locate the point on CCD image. But the large amount of data makes it respond slowly an d unsuitable for the real-time digital photogrammetrical system.In this paper an approach is proposed: CCD image is pre-processed by a hybrid circuit such that only signals of targets above the threshold are obtained; the centroids of targe ts are then calculated by the combination of target recognition and location alg orithm.The operation reduces the processing data substantialy and meets the dema nd of real-time photogrammetry.