A two-dimensional wavelet transform processing apparatus, more effectively utilizing
hardware resource, is realized with reduced hardware construction. For this purpose,
the filter processing apparatus has a vertical DWT processor (901) for performing
filter processing on image data and outputting 2 types of data obtained by the
processing as 1 pair of data, a rotation unit (903) for rearranging the
data outputted from the vertical DWT processor by rotating the data by 90
by 2 pairs and outputting the data, and a horizontal DWT processor (905)
for performing filter processing on the image data rearranged by the rotation unit
and outputting 2 types of data obtained by the processing as 1 pair of data.
