Multimodal Medical Image Registration Based on an Information-Theory Measure with Histogram Estimation of Continuous Image Representation

Figure 1

Process of joint histogram estimations in 2D. (a) Four neighborhood points around the central point on nongrid locations (cross) and nine grid points (black dots). (b) Four points on the grid (four dots). (c) The square constituted by four grid points in (b) is divided into two triangles. (d) The intersection point (black circle) of two isointensity lines. The solid line and dashed line represent the respective isocurves of two images.

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