Ricoh Company, Ltd.

Kazuhiro Miyazaki

Yutaka Sato

Yukio Kadowaki

Mitsutaka Iwasaki

An image processing apparatus includes a coding part that performs coding on image data based on the result of decomposing the image data into bit planes block by block, and a quantization part that reduces the values of the image data of a predetermined block to be compressed at an increased rate. The quantization part is provided at an earlier stage than the coding part.

Image processing apparatus and method capable of finely adjusting data compression rate

The present invention provides an image processing device, an image processing method, and an image reading method, by which encoded data can be easily generated from sub-sampled image data, without a complicated circuit or an increase in the data amount. A one-dimensional wavelet transform in a predetermined direction is omitted in stagewhere componentsandof input image data have been sub-sampled. When coefficient data generated through such a two-dimensional wavelet transform are to be encoded, sub-bands that are not contained in the coefficient data in comparison with the coefficient data of a componentshould be considered to have been truncated.

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Kanagawa, Japan

Kazuhiro Miyazaki