The hardware components of a real-time photogrammetric imaging 
system may contain (1) Charge Coupled or Charge Injection Devices (CCD or 
CID) or even Photodiodes, (2) Image Data Transfer facilities and (3) 
Frame-grabbing facilities (to hook onto non-standard analog signals like 
Analog-Digital converters). 
In these regards, biomechanic applications were among the earliest 
real-time semi-photogrammetric svstems found in literature (e.g., k'oltring 
1974). These applications were followed by other unconventional applica 
tions like industrial measurements (Pinkney 1978), and machine vision 
(Haggren 1986). It is apparent that real-time photogrammetric systems 
offer, due to their fast operational abilities, further possibilities with 
regard to system calibration, network design, control feedback and interac 
tive processing (Gruen 1988).