1. A method for detecting an abnormality from a radiographic image, the method comprising: comparing, at a processing system, data representative of the radiographic image to reference template image data; calculating, at the processing system, a cross correlation coefficient between a plurality of regions in the data representative of the radiographic image and a corresponding plurality of regions in the reference template image data; determining, at the processing system, an abnormality region in the data representative of the radiographic image based on a value of the cross correlation coefficient; and computing, at the processing system, a severity level of the abnormality region.