According to the present invention, provided are an image discrimination
apparatus and an image discrimination method for determining whether diaphragmatic
radiation has been employed to obtain an autoradiograph of an object using a radiographic
device having a diaphragmatic radiation function. According to the image discrimination
apparatus and the image discrimination method of the present invention, 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 the autoradiograph has been obtained by using diaphragmatic
radiation. Therefore, so that preferable image processing can be performed, it
is possible to precisely determine whether diaphragmatic radiation was employed
when an autoradiograph of an object was obtained using a radiographic device having
a diaphragmatic radiation function, whether a designated portion in an autoradiograph
of an object, which is obtained by a radiographic device having a diaphragmatic
radiation function, 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 of an object that is obtained
by a radiographic device having a diaphragmatic radiation function.