Picture signal processor

Abstract

Abstract PURPOSE:To sharpen correctly the not only a character image part but also a halftone image part by selecting a different image emphasizing means in accordance with whether a notice picture element is in the character image part or the halftone image part. CONSTITUTION:An analog picture signal 22 from an image sensor 21 is converted to a digital picture signal 24 of 6 its and 64 gradations by an A/D converter 23. This digital picture signal 24 is supplied successively by one picture element each to an image data extracting part 25, and in this part, an image data of a notice picture element and an image data of its peripheral picture element are latched once and provided to an image state discriminating circuit 26. The discriminating circuit 26 discriminates from these picture element data whether the notice picture element is in a character image part or a halftone image part, its result is supplied to a multiplexer 41, and an output of the first or the second image emphasizing circuit 27, 28 is fetched.

Inventors

• 👤 Taiji Nagaoka
• 👤 永岡　大治
• 👤 Yoshihiro Ishida
• 👤 良弘 石田

Bibliographic Details