摄影测量的自动化核心是自动立体观测,它常常是通过对左、右影象的相关处理来实现的。但是为了实现正确的相关往往是与滤波分不开的,早期和近期的电子相关自动化仪器与数字相关仪器几乎都应用滤波,进行分频段相关。例如最近在西德Hannover试验的RASTAR The center of automation of photogrammetry is autostereoscopic observation, which is often done by correlating left and right images. However, in order to achieve the correct correlation is often inseparable from the filter, early and recent electronic-related automation instruments and digital-related instruments are almost always applied filtering, sub-band-related. Such as RASTAR, recently tested in Hannover, West Germany