An Enhancement Method for X-Ray Image Using Rough Sets and Human Visual System
Chengsu Ouyang · Xi'an Jiaotong Daxue xuebao · 2009
The X-ray image from direct digital radiography system is captured in non-uniform and low illumination conditions,and is blurred by noise.A new enhancing method is proposed on the basis of rough set theory and human visual system(HREM).The grays of the original image are stretched,and then the stretched image is used to generate two new images(edge-detail image and smooth image) using the rough set theory and the human visual system.The edge-detail and smooth images are enhanced by the exponential transform and histogram equalization,respectively.Finally,the two enhanced images are overlapped into one image,and the random impulse noise in the overlapped image is reduced.Experimental results show that the HREM method can suppress noise while preserving edge and detail element,and enhance visual effect effectively.