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US 4,468,755 AGranted
Document size conversion circuit for a document filing system
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorKazuhiko Iida
Life of this patent
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Abstract
Picture information stored in a memory device is read out and written into a page buffer and visually displayed on the screen of a CRT display under control of an interface unit for display, through a size conversion circuit.
Claims4
A document size conversion circuit for a document filing system comprising:
- an information input terminal to which pieces of line picture information are supplied;
- a plurality of memories each adapted to store one of said pieces of line picture information supplied to the terminal;
- means for forming a matrix array of local picture information consisting of bits extracted from said plurality of memories;
- means for obtaining a picture dot position in said matrix array of local picture information, the picture dot position corresponding to a size conversion rate;
- means for obtaining an average gray level of said matrix array of local picture information with respect to said picture dot position;
- and
- comparator means for comparing said average gray level and a predetermined slice level to form size converted data.
4 more elements
Dependencies are inferred from the claim text.