Abstract: Apparatus for evaluating optoelectronically generated picture rasters wherein, for the purpose of regulating the tape movement of a tape-shaped material (tape), the tape position is detected with the aid of a video camera by continuously reproducing an edge of the tape or a marking line on the tape as a sudden change in contrast, each picture raster or frame is scanned line-by-line for the purpose of evaluation and the picture elements in each line occurring up to the selected sudden change in contrast are counted by means of a picture element counter, and the count is used to provide an analog output signal, by means of a digital/analog converter, which is used to form a setting instruction to mechanically adjust the tape position to the desired position. The input signal to the digital/analog converter is provided by the output of a second counter which serves as a memory having a counting content of picture elements corresponding to the previously detected tape position.