Patent ID: 8288729

Claim:
An image processing apparatus comprising: a storage unit that stores a first leakage current value which is output through a signal line provided in a predetermined direction in a radiographic image detector which converts emitted radiation into a charge and stores and holds the charge, a charge corresponding to uniformly emitted radiation being held in the radiographic image detector; and an estimating unit that estimates a ratio between an object area and a background area on a line arranged along the signal line in an image which is held as the charge in the radiographic image detector, or estimates lengths of the object area and the background area, based on the ratio between the first leakage current value stored in the storage unit, and a second leakage current value output through the signal line when radiation passing through an object is emitted to the radiographic image detector, a charge corresponding to the radiation passing through the object being held in the radiographic image detector.