Since the reproduced image of the partial data area thus attained may possibly be shifted from the subregion requested by the user, in the embodiment of the present invention, a read region for the image data read operation is set to be greater than the partial data region obtained by {HEAD ~ the subdivision} of {TAIL ~ the image} 
Since the reproduced image of the partial data area thus attained may possibly be shifted from the subregion requested by the user , in the embodiment of the present invention , a read region for the image data read operation is set to be greater than the partial data region obtained by { HEAD ~ the subdivision } of { TAIL ~ the image }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL