Automated measurement of objects using deformable models
First Claim
1. A method for determining geometrical properties of a structure of an object of interest displayed in an image, comprising the steps of:
- (a) generating a deformable surface model of a surface of a training object, wherein the deformable surface model includes a mesh of triangles;
(b) generating an extended deformable surface model of the training object by associating additional geometrical information to the generated deformable surface model of the training object, wherein the step of generating an extended deformable surface model includes;
identifying triangles belonging to sub-parts of the training object;
labeling the triangles belonging to the respective sub-parts of the training object;
selecting a geometric primitive in accordance with a measurement to be carried out and a form of a selected corresponding sub-part;
fitting the geometric primitive to surface elements labeled to the selected corresponding sub-part;
determining a rule which defines the selected geometric primitive and a method which fits the selected primitive onto the selected corresponding sub-part; and
labeling each triangle with the determined rule along with the respective sub-part label to generate an extended deformable surface model;
(c) adapting the extended deformable surface model to a surface of the object of interest, such that a one-to-one point correspondence is maintained between the extended deformable surface model and the adapted extended deformable surface model;
(d) determining the geometrical properties of the structure of the object of interest from the adapted extended deformable surface model according to the associated additional geometrical information; and
(e) extracting at least one measurement of interest of the structure based on the determined geometrical properties.
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Abstract
The present invention relates to the field of digital imaging, in particular to the field of estimating geometrical properties of an anatomical object. According to the present invention, geometrical properties are automatically measured and geometrical properties which have a definition based on sub-parts of the object are derived. To do this, additional geometrical information is integrated into a surface model. Geometrical properties are included into the surface model by identifying and labelling sub-parts of the surface model and fitting geometric primitives to these sub-parts. This advantageously allows to identify these sub-parts on an unseen object surface and to automatically extract relevant geometric properties.
11 Citations
19 Claims
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1. A method for determining geometrical properties of a structure of an object of interest displayed in an image, comprising the steps of:
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(a) generating a deformable surface model of a surface of a training object, wherein the deformable surface model includes a mesh of triangles; (b) generating an extended deformable surface model of the training object by associating additional geometrical information to the generated deformable surface model of the training object, wherein the step of generating an extended deformable surface model includes; identifying triangles belonging to sub-parts of the training object; labeling the triangles belonging to the respective sub-parts of the training object; selecting a geometric primitive in accordance with a measurement to be carried out and a form of a selected corresponding sub-part; fitting the geometric primitive to surface elements labeled to the selected corresponding sub-part; determining a rule which defines the selected geometric primitive and a method which fits the selected primitive onto the selected corresponding sub-part; and labeling each triangle with the determined rule along with the respective sub-part label to generate an extended deformable surface model; (c) adapting the extended deformable surface model to a surface of the object of interest, such that a one-to-one point correspondence is maintained between the extended deformable surface model and the adapted extended deformable surface model; (d) determining the geometrical properties of the structure of the object of interest from the adapted extended deformable surface model according to the associated additional geometrical information; and (e) extracting at least one measurement of interest of the structure based on the determined geometrical properties. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image processing device, comprising:
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a memory which stores a simple training model and an image depicting an end sub-part and a shaft sub-part of a bone; and an image processor which determines geometrical properties of the of the sub-parts of the bone, wherein the processor is programmed to perform the following operations; (a) generating a deformable surface model of a surface of a training object, the training object being distinct from the bone depiction; (b) generating an extended deformable surface model of the training object by associating additional geometrical information to the generated deformable surface model of the training object; (c) adapting the extended deformable surface model to a surface of the bone, such that a one-to-one point correspondence is maintained between the extended deformable surface model of the training model and the adapted extended deformable surface model of the bone; (d) determining the geometrical properties of the sub-parts of the bone from the adapted extended deformable surface model based on the associated additional geometrical information; and (e) extracting at least one measurement of interest of the sub-parts based on the determined geometrical properties. - View Dependent Claims (13)
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14. A non-transitory computer-readable medium having processor-executable instructions thereon for execution by a processor of an image processing device to control the processor to determine geometrical properties of a structure of an object of interest by performing:
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a) generating a deformable surface model of a surface of a training object; (b) generating an extended deformable surface model of the training object by associating additional geometrical information to the generated deformable surface model of the training object; (c) adapting the extended deformable surface model to a surface of the object of interest, such that a one-to-one point correspondence is maintained between the extended deformable surface model and the adapted extended deformable surface model; (d) determining the geometrical properties of the structure of the object of interest from the adapted extended deformable surface model according to the associated additional geometrical information; and (e) extracting at least one measurement of interest of the structure based on the determined geometrical properties.
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15. A method for determining geometric properties of a subpart of an object of interest, comprising:
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(a) with a processor, generating a deformable surface model represented by a polygon mesh of a surface of a training object; (b) with the processor, extending the generated deformable surface model with additional geometrical information; (c) with the processor, deforming the extended deformable surface model to optimally fit a surface of at least one sub-part of the object of interest; (d) with the processor, determining geometrical properties of the object of interest based on the additional geometrical information of the deformed extended surface model fit to the sub-part. - View Dependent Claims (16, 17, 18, 19)
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Specification