An apparatus and method are provided for determining whether diaphragmatic radiation
has been employed to obtain an autoradiograph of an object using a radiographic
device having a diaphragmatic radiation function. An autoradiographic signal is
entered and a first characteristic value is calculated using an autoradiograph
designated by the autoradiographic signal, and then a frequency is calculated for
the appearance of a density value for pixels constituting the edge of the autoradiograph
that is determined using the first characteristic value and the frequency is employed
to determine whether diaphragmatic radiation was used. So that preferable image
processing can be performed, it is determined whether diaphragmatic radiation was
employed in obtaining the autoradiograph, whether a designated portion in the autoradiograph
is an irradiation area, and whether a plain image (an image produced when radioactive
rays do not pass through an object but directly irradiate a sensor) is present/absent
in the autoradiograph.
