Feature extraction of knee X-rays

A feature extraction algorithm has been successfully applied to knee x-rays. The four main features of the algorithm are: (1) A description of the picture class guides the feature extraction; (2) The search for objects is global to local; (3) A region enumeration technique finds regions of contiguous points with similar gray shades; and (4) A ´field of vision´ concept aids in classifying all the points in a given area of the picture.