• To reduce the health risk from exposure to radiation while mse a radiation dose that is as low as possible.
• . However, the constraint on irradiation dose leads to considerable noise in CT scans.
Simulation Results
Fig2:Correlation graph for two similar images length of the peak=1
Results for illumination invariance
fig 5:(a) and (b) are the X-ray images of the same chest with variation in illumination.
[4]H.Nakajima et al, “A Fingerprint Matching Algorithm Using Phase Only Correlation“. IEICE Trans. Fundamentals, Vol.87-A,pp 682-691,Mar.2004.
• By determining the number of pixels with low attenuation, emphysema can be detected .
• . PI determines the average number of pixels with lower attenuation than the limit value(lim).
• Fig.12 : (1a),(1b),(1c)Simulation results for emphysema detection