Image coding apparatus for converting image information to varia

Details Image coding apparatus for converting image information to varia Image coding apparatus for converting image information to varia

1997-12-24

2000-04-18

Tran, Phuoc

Image analysis

Image compression or coding

Adaptive coding

382233, 382246, 382248, G06K 936, G06K 946

Patent

active

06052488&

ABSTRACT:
In an electronic still camera, a compression coefficient estimating unit performs preencoding using only an LA component of FBTC compressed data read from an image memory, and estimates an optimal compression ratio based on the result of preencoding. Thereafter, JPEG encoder performs JPEG compression on the image data applied from FBTC decoder with the estimated compression coefficient, and transfers the result to a recording apparatus. As compared with the prior art in which image data is directly preencoded, the time for preencoding can be significantly reduced and image memory requires smaller capacity.

REFERENCES:
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patent: 5307177 (1994-04-01), Shibata et al.
patent: 5414527 (1995-05-01), Koshi et al.
patent: 5621465 (1997-04-01), Kondo
patent: 5629779 (1997-05-01), Jeon
patent: 5859932 (1999-01-01), Etoh
"Image Coding Schemes for Hard Copiers". Kenichiro Oka et al., Bulletin of the Japanese Society of Printing Science and Technology, vol., 27, No., 3, 1990, pp. 290-297.

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