Several Pivotal Techniques Based on Digital Close Range Photogrammetry

A measurement technique about coordinate of space points based on digital close range photogrammetry was investigated. Two kinds of reference points were placed on the object surface to determinate their spatial position by identifying and detecting. Several key techniques, including code and decode, calibration of the camera, camera orientating technique, high precise image processing algorithm were also studied. The precision of the algorithm was tested and a sample was provided. The result indicated that the testing scope is enlarged and the demand for the measurement of 3D object, especially of the big object is satisfied.