Image analysis – Image segmentation
Patent
1996-07-30
1998-10-27
Tran, Phuoc
Image analysis
Image segmentation
382176, 382280, 382281, G06K 934
Patent
active
058287825
ABSTRACT:
An image processing apparatus which eliminates influence of motion of background and performs stable text-image cutout at a high extraction rate. In the apparatus, a block divider 20 divides image data in frame units into blocks of a predetermined size. A DCT unit 24 performs orthogonal transformation on each divided block, and a harmonic coefficient calculator 25 extracts data for judging whether or not the block is a character area. A still-block detector 26 compares the data with data of a corresponding block after orthogonal transformation in a previous frame, judges whether or not the difference between these data is small or large, and outputs the result of judgment. An attribute judgment unit 23 judges whether or not the block is a character area, based on the data from the harmonic coefficient calculator 25 and the data from the still-block detector 26, and outputs the result of judgment.
REFERENCES:
patent: 5101438 (1992-03-01), Kanda et al.
"DCT Method Using Adaptive Quantization", The Journal of the Institute of Image Electronics Engineers of Japan, vol. 20, No.5 1991 and English Abstract.
Mizuno et al., "Image Region Separation Method Using DCT Conversion", Proceedings of the Institute of Image Electronics Engineering of Japan, (IIEEJ), Jan. 2, 1993, and English Translation.
Matsubayashi Kazuhiro
Sunakawa Shinichi
Canon Kabushiki Kaisha
Tran Phuoc
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