M. Járó - L. Költő szerk.: Archaeometrical research in Hungary (Budapest, 1988)

Prospecting - ERDÉLYI Balázs, PATTANGYUS-Á. Miklós: Computer image processing and soil resistivity survey of an archaeological site discovered by aerial photography

The higher resistivity zones can be distinguished easily at first sight, although they seem to reflect not only the effect of the linear object. Since the effect looked for must also be included in this data system, processing by the appropriate filter which is suitable for emphasizing this effect is necessary. Many types of filters were applied to the map of Fig. 3, and the application of a residual filter sensitive to double edge was found to provide the best result (Fig. 4). Fig- 4 Filtered version of the resistivity map of Fig. 3, Filtering was performed by means of a symmetric edge filter in NW-SE direction and ofO sum. This is a gradient map on which the changes in the selected direction are shown. On this map the direction of the linear object (earthwork) of Fig. 2 can be traced: moreover, several characteristics can also be interpreted.