Emphasizing method of sharpness in image scanning and recording apparatus

Abstract

Abstract PURPOSE: To make it possible to emphasize the sharpness of duplicate images without requiring many slits by weighting the respective picture element signals near the scanning points and using these weighted mean values. CONSTITUTION: The color signals read out from the original picture of an image cylinder 10 are subjected to A/D conversion 12 and are converted to respective color plate signals in a color operating unit 13, thence they are sent to a color selecting circuit 14, where the signals of the color plates desired to be duplicated and recorded are selected and are supplied to a memory 15. Next, a sharpness emphasizing circuit 16 reads out the density information near the required scanning points from the memory 15 and performs weighting of specified coefficients upon these, further averages the weighting and generates a sharpness emphasized signal E. This signal E is sent via a D/A converter 17 to a recording head 19, by which the images are recorded. In this way, the need for beforehand preparing many slits is eliminated and the duplicate images of emphasized sharpness may be obtained. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Mitsuhiko Yamada

Bibliographic Details