Image processing method and apparatus

Details Image processing method and apparatus Image processing method and apparatus

1997-12-16

1999-11-30

Tran, Phuoc

Image analysis

Histogram processing

With pattern recognition or classification

382250, 382280, 382281, 382176, G06K 900

Patent

active

059956577

ABSTRACT:
To improve an area cut-out ratio, a difference value between coefficients which are neighboring in an image block is calculated by a difference value calculation unit, an average value and a dispersion value of the difference value data are calculated by a distribution state calculation unit, and the average value and the dispersion value are compared with preset threshold values by a threshold value determination unit, thereby determining whether the relevant block is a character pattern area or not.

REFERENCES:
patent: 5101438 (1992-03-01), Kanda et al.
patent: 5828782 (1998-10-01), Sunakawa et al.
"Image Region Separation Method Using DCT Conversion", Toru Mizuno, et al. Society for Research of the Institute of Image Electrical Engineers of Japan, pp. 7-12, Jan. 2, 1993 (with English language translation).
"DCT Encoding Method Using the Adaptive Quantization", Kazuyuki Murata, vol. 20, No. 5, The Magazine of the Institute of Image Electrical Engineers of Japan, pp. 466-475 (with English language summary), May 1991.

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