Detection and rendering of text in tinted areas

Details Detection and rendering of text in tinted areas Detection and rendering of text in tinted areas

1996-05-30

1998-12-22

Tran, Phuoc

Image analysis

Image segmentation

Distinguishing text from other regions

382205, 382264, 358462, G06K 934

Patent

active

058526781

ABSTRACT:
A method and apparatus improves digital reproduction of a compound document image containing half-tone tint regions and text and/or graphics embedded within the half-tone tint regions. The method entails determining a local average pixel value for each pixel in the image, then discriminating and classifying based on the local average pixel values, text/graphics pixels from half-tone tint pixels. Discrimination can be effected by calculating a range of local averages within a neighborhood surrounding each pixel; by calculating edge gradients based on the local average pixel values; or by approximating second derivatives of the local average pixel values based on the local averages. Text/graphics pixels are rendered using a rendering method appropriate for that type of pixel; half-tone tint pixels are rendered using a rendering method appropriate for that type of pixel.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
patent: 4893188 (1990-01-01), Murakami et al.
patent: 5001767 (1991-03-01), Yoneda et al.
patent: 5293430 (1994-03-01), Shiau et al.
W. Pratt, "Digital Image Processing," 2nd Edition, John Wiley & Son, New York 1991, pp. 500-501.

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