A Novel Technique for Prealignment in Multimodality Medical Image Registration
Figure 10
Simulated orientation test by edge-map based method of T1 MRI (Figure 2(a)) and rotated T2 MRI (Figure 2(c)) images. (a) Canny edge map of Figure 2(a). (b) Canny edge-map of Figure 2(c). (c) Magnitude spectrum of edge map of (a) in frequency domain. (d) Magnitude spectrum of edge map of (b) in frequency domain. (e) Log-polar resample of (c). (f) Log-polar resample of (d). (g) Phase-correlation between (e) and (f). Note that the peak value corresponded to the rotational angle 11.25°, which was also very close to the desired value.
