Method and circuit arrangement for contrast intensification

Details Method and circuit arrangement for contrast intensification Method and circuit arrangement for contrast intensification

B - Operations, Transporting

41

C

342/5, 101/8

B41C 1/02 (2006.01) H04N 1/409 (2006.01)

Patent

CA 1180793

ABSTRACT A method and an apparatus are provided for con- trast intensification in the reproduction of masters in the field of electronic image processing by engraving devices and scanners. In the image-point wise, opto- electronic master scanning, two outer field signals are obtained in addition to the image signal by scanning a first outer field and a larger, second outer field. A first differential signal and a second differential signal are generated from the image signal and the outer field signals and a third differential signal is gener- ated from the two outer field signals. The first differential signal is combined with at least one of the other two differential signals to form an auxiliary signal which is added to the first differential signal in order to obtain a correction signal. The correction signal is then superimposed on the image signal for the purpose of contrast intensification. By employing a second outer field signal, it is particularly the disturbing edges around hard master contours which are avoided.

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