Biomedical Engineering Reference
In-Depth Information
(a)
(b)
Figure 4.3: Joint histogram of images (c) and (d) in Fig. 4.2. (a) Before regis-
tration; (b) after registration by mutual information maximization (registration
parameters:
x
and
y
translations are
−
4
.
62 and
−
2
.
21 pixels, rotation angle is
0.50
◦
, and scaling factor is 0.9979).
However, the relationship becomes convoluted. Again, the joint histogram at
registration is more structured than at misregistration.
As a demonstration of this joint histogram aggregation concept, we display
some joint histograms at registration and at misregistration in the following
figures. Figure 4.3 depicts the joint histograms of images (c) and (d) (stereo
registration) in Fig. 4.2 before and after registration. The registration parameters
are shown in the figure caption. The horizontal direction corresponds to the pixel
