Aerial camera system and method for correcting distortions in an aerial photograph

摘要

The invention relates to a method for correcting a distortion in an aerial photograph (1) caused by a flight movement in the forward direction, the photograph being taken with an aerial camera (2) from a flying object (3). The aerial photograph (1) is captured by a surface sensor (4) of the aerial camera (2) having a plurality of photo-sensitive pixels (5), the sensor lines (6) of which sensor, in particular rows, are exposed at different, successive exposure times by means of a slit diaphragm shutter (7) which moves over a projected image, so that each individual sensor line (6) senses a strip of terrain (9) of the terrain (8) flow over at the different exposure times. According to the invention, a relative flight altitude, which is current in particular at the exposure time, above the strips of terrain (9) captured by the respective sensor line is assigned to the individual sensor lines (6). Furthermore, a compensation factor is separately determined for each of the individual sensor lines (6), wherein the factor depends on an air speed of the flying object (3), a focal length of the aerial camera (2) and the relative flight altitude assigned to the respective sensor line, and corrects the distortion in the aerial photograph (1) for the lines based on the respective compensation factor.