Method and apparatus for controlling a spatial filtering process

Details Method and apparatus for controlling a spatial filtering process Method and apparatus for controlling a spatial filtering process

1995-01-11

1999-03-23

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358458, 358448, 382266, H04N 140

Patent

active

058867970

ABSTRACT:
A method and apparatus for controlling a MTF correction process using the reference pixel density and the edge amount of the reference pixel. An edge amount is a result of a high-pass filtering process of the reference pixel data. A pixel density conversion table and an edge amount conversion table adaptively determine the MTF correction value based on the reference pixel density and the edge amount of the reference pixel. The high-pass filtering process is implemented with bit-shift operations and an add operation of the pixel data. To use the reference pixel density data for controlling the MTF correction process, high adaptability for low contrast character region.

REFERENCES:
patent: 5381490 (1995-01-01), Shin
patent: 5539541 (1996-07-01), Ushida
"Segmentation Method for Documents Containing Text/Picture (Screened Halftone, Continuous Tone)" Satoshi Ohuchi et al, The Proceeding of the IIEEJ 20th Annual Meeting and Advanced Session Jun. 6-Jun. 11, 1992 pp. 39-47.

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