Image processing device, image processing method, and image reading method

An image processing device comprising:

• a two-dimensional wavelet transformer that performs a two-dimensional wavelet transform in one or more stages, and comprises a one-dimensional horizontal wavelet transformer that performs a one-dimensional wavelet transform in the horizontal direction on image data produced for each of a plurality of components, and a one-dimensional vertical wavelet transformer that performs a one-dimensional wavelet transform in the vertical direction on the image data;
• and
• an input-output switcher that switches inputs and outputs of the one-dimensional horizontal wavelet transformer and/or the one-dimensional vertical wavelet transformer in a first stage,
• the input-output switcher switching the inputs and outputs so as not to perform said one-dimensional wavelet transform in a predetermined direction in the first stage, where lines in the predetermined direction have been thinned in the image data.

An image processing device comprising:

• a two-dimensional inverse wavelet transformer that performs a two-dimensional inverse wavelet transform in one or more stages, and comprises a one-dimensional horizontal inverse wavelet transformer that performs a one-dimensional inverse wavelet transform in the horizontal direction on coefficient data comprising one or more sub-bands, and a one-dimensional vertical inverse wavelet transformer that performs a one-dimensional inverse wavelet transform in the vertical direction on the coefficient data;
• and
• an input-output switcher that switches inputs and outputs of the one-dimensional horizontal inverse wavelet transformer and/or the one-dimensional vertical inverse wavelet transformer in the last stage,
• the input-output switcher switching the inputs and outputs so as not to perform said one-dimensional inverse wavelet transform in the horizontal direction and/or the vertical direction in the last stage, depending on the configuration of the image data to be produced.