| 摘要 |
<p>An image data generator for generating data on a size-reduced image of an original image includes: an inverse wavelet transform part performing inverse wavelet transform on wavelet coefficients; and a coefficient selecting part selecting, of wavelet coefficients in a sub-band, wavelet coefficients to be subjected to the inverse wavelet transform. The inverse wavelet transform part performs the inverse wavelet transform only on the wavelet coefficients selected in the coefficient selecting part with respect to the wavelet coefficients in the sub-band.
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