Precise Determination of Fisheye Lens Resolution

Using fisheye lens in close range photogrammetry gives great possibilities in acquiring photogrammetric data of places, where access to the object is very difficult. But such lens have very specific optical and geometrical properties resulting from great value of radial distortion. In my approach before calibration, Siemens star test was used to determination of fisheye lens resolving power. I have proposed a resolution examination method that is founded on determination of Cassini ovals and computation of some coefficient. This coefficient modifies resolution calculations. Efficiency of my method was estimated by its comparison with classical way and statistical analysis. Proposed by me procedure of lens resolutions investigations can be used not only in case of fisheye lens, but also in case of another wide-angle lenses. What have to be mentioned is fact, that the smaller focal length of lens, the more accurate is the method. Paper presents brief description of method and results of investigations.