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 caused by a flight movement in the forward direction. The aerial photograph is captured by a surface sensor, the sensor lines of which sensor are exposed at different, successive exposure times, so that each individual sensor line senses a strip of terrain of the terrain flow over at the different exposure times. A relative flight altitude above the strips of terrain captured by the respective sensor line is assigned to the individual sensor lines. Furthermore, a compensation factor is separately determined for each of the individual sensor lines, wherein the factor depends on an air speed of the flying object, a focal length of the aerial camera and the relative flight altitude assigned to the respective sensor line, and corrects the distortion in the aerial photograph for the lines based on the respective compensation factor.

主权项

1. A method for correcting a distortion, caused by a forward flight movement, in an aerial photograph that is taken with an aerial camera from a flying object, the method comprising:
the aerial photograph being captured by a surface sensor of the aerial camera, the surface sensor having a multiplicity of photosensitive pixels, and sensor lines being exposed at different exposure times with a slit diaphragm shutter displaced over a projected image, so that individual sensor lines each sense a terrain strip of overflown terrain at different exposure times; each of the individual sensor lines being assigned a flight altitude, current at an exposure time, above the terrain strip sensed by the individual sensor line; and there being determined, separately for each individual sensor line, a compensation factor that depends on an air speed of the flying object, on a focal length of the aerial camera and on the flight altitude assigned to the sensor line, and the distortion in the aerial photograph being corrected in linewise fashion with a compensation factor.