Method for automatically mapping of geometric objects in digital medical images
View Patent ↗A method of mapping geometrical objects to a digital image. At least one anchor point in a model is selected and mapped to the digital image. A geometric transformation is computed on the basis of at least one correspondence between an anchor object and a corresponding mapped object, and the calculated geometric transformation is applied to at least one geometric object thereby mapping it from the model image to a corresponding mapped position in the digital image.
1. A method of mapping a geometric object of a model image in a digital target image comprising
selecting at least one anchor point of the geometric object in the model image,
mapping the anchor point into said target image to obtain a target anchor point,
computing a linear geometric transformation matrix on the basis of correspondence between the at least one anchor point and the corresponding target anchor point,
decomposing the linear geometric transformation matrix in a sequence of elementary geometric operations selected from translations, scalings, rotations, shearings and projectivities, wherein each of the elementary geometric operations is represented by a matrix,
canceling at least one elementary geometric operation associated with a selected or small component by equating the matrix associated with said selected or small component to a corresponding identity matrix,
recombining the resulting sequence of matrices of elementary operations into a transformation matrix, and
applying the geometric transformation corresponding with the resulting transformation matrix to the model geometric object to map said model geometric object to a corresponding mapped position in said target image.
2. The method according to claim 1 wherein the model is displayed as a model image comprising anchor objects.
3. The method according to claim 2 , wherein the anchor objects are points.
4. The method according to claim 2 , wherein the anchor objects are lines.
5. The method according to claim 2 wherein geometric objects are rendered in the model image.
6. The method according to claim 5 wherein the geometric objects are encoded relative to the anchor objects.
7. The method according to claim 5 , wherein the anchor objects or the geometrical objects represent anatomic entities.
8. The method according to claim 1 , wherein the target image is a medical image.