The Paper's Abstract
of The 3rd
International Conference on Imaging Science and Hardcopy
Study
on Quantization Tables
in JPEG Compression
May
26-29,1998
Chongqing China
Tsutomu
Shohdohji*, Yasuhiro Hoshino O** and Yasushi
* Department
of Systems Engineering, Faculty of Engineering,
Nippon Institute of Technology, Saitama, Japan
** Hitachi Public System Service Co., Ltd., Tokyo, Japan
The
purpose of this research is to design a quantization table that
deter-mines the quality of the reconstructed image when we compress the
image with JPEG algorithm. There
are generally various kinds of images.
Therefore, we should use a quantization table that has the char-acteristics
of the image in the case of using JPEG algorithm.
However, it is difficult to design a quantization table suitable
for an image. Therefore, we
decided to divide the characteristics of an image into 3 classes by the
constitution ratio of the frequency component, and design a quantization
table for each image. Thus,
we obtained better results than JPEG algorithm.
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.