Generating a representation of an object of interest

1. A method for generating an image of an object of interest, the method comprising:

accessing a volumetric image of a space, the space including an object of interest and another object, the volumetric image comprising multiple voxels with at least one voxel representing the object of interest and at least one voxel representing the other object, wherein each voxel is associated with a numerical value;

accessing a two-dimensional radiograph comprising data representing the object of interest and data representing the other object;

identifying, in the volumetric image, a voxel representing the object of interest;

generating a de-objectified volumetric image by disregarding the identified voxel;

removing from the two-dimensional radiograph a two-dimensional representation of the other object that is derived from the de-objectified volumetric image to generate a two-dimensional image of the object of interest.

2. The method of claim 1 , wherein the two-dimensional representation of the other object that is derived from the de-objectified volumetric image is a two-dimensional projection of the de-objectified volumetric image.

3. An apparatus comprising:

a source of radiation configured to emit radiation that illuminates a space;

a sensor configured to sense radiation from the space;

a processor; and

a computer-readable storage medium storing instructions for generating an image of an object of interest, the instructions, when executed, cause the processor to perform the following:

access a volumetric image of a space, the space including an object of interest and another object, the volumetric image comprising multiple voxels with at least one voxel representing the object of interest and at least one voxel representing the other object, wherein each voxel is associated with a numerical value;

access a two-dimensional radiograph comprising data representing the object of interest and data representing the other object;

identify, in the volumetric image, a voxel representing the object of interest;

generate a de-objectified volumetric image by disregarding the identified voxel;

remove from the two-dimensional radiograph a two-dimensional representation of the other object that is derived from the de-objectified volumetric image to generate a two-dimensional image of the object of interest.

4. A system comprising:

a scan region configured to receive an object;

a source of radiation configured to illuminate the scan region;

a sensor configured to sense radiation from the scan region;

a processor; and

a computer-readable storage medium storing instructions for generating an image of an object of interest, the instructions, when executed, cause the processor to perform the following:

access a volumetric image of a space, the space including an object of interest and another object, the volumetric image comprising multiple voxels with at least one voxel representing the object of interest and at least one voxel representing the other object, wherein each voxel is associated with a numerical value;

access a two-dimensional radiograph comprising data representing the object of interest and data representing the other object;

identify, in the volumetric image, a voxel representing the object of interest;

generate a de-objectified volumetric image by disregarding the identified voxel;

remove from the two-dimensional radiograph a two-dimensional representation of the other object that is derived from the de-objectified volumetric image to generate a two-dimensional image of the object of interest.

5. A method comprising:

accessing a two-dimensional image, the two-dimensional image comprising data that represents an object of interest and data that represents a clutter object; and

removing the data that represents the clutter object from the accessed two-dimensional image by subtracting a two-dimensional representation of the clutter object that is derived from a volumetric image of a space from the accessed two-dimensional image, the space comprising the object of interest and the clutter object, the volumetric image comprising multiple voxels with at least one voxel representing the object of interest and at least one voxel representing the clutter object, wherein each voxel is associated with a numerical value.

6. The method of claim 5 , wherein the two-dimensional image comprises an image of a space, and the volumetric image comprises a volumetric image of at least a portion of the space.

7. The method of claim 6 , wherein the two-dimensional image comprises an x-ray projection of a portion of the space.

8. The method of claim 6 , wherein the clutter object overlays the object of interest in the space.

9. The method of claim 5 , further comprising visually presenting the object of interest by presenting the accessed two-dimensional image with the representation of the clutter object removed.

10. The method of claim 9 , wherein the object of interest is presented as an image having a resolution that is greater than a resolution of the volumetric image.

11. The method of claim 5 , wherein accessing two-dimensional image comprises receiving two-dimensional data.

12. The method of claim 5 , wherein the two-dimensional image comprises a two-dimensional radiograph generated by an x-ray screening system, and the volumetric image comprises a volumetric image generated by the x-ray screening system.

13. The method of claim 5 , wherein the two-dimensional image comprises data that represents multiple objects of interest and multiple clutter objects, and removing the data that represents the clutter object comprises removing data that represents the multiple clutter objects.

14. The method of claim 5 , wherein, to derive the representation of clutter object from the volumetric image, the clutter object is identified in the volumetric image.

15. The method of claim 14 , wherein the clutter object is identified based on material properties of the clutter object.

16. The method of claim 5 , further comprising presenting the object of interest to an automated process.

17. The method of claim 5 , wherein the two-dimensional representation of the clutter object that is derived from the volumetric image of the space is a two-dimensional projection of the volumetric image of the space.

18. An apparatus comprising:

a display;

an interface coupled to the display and configured for manipulation by a user;

an electronic processor; and

a computer-readable storage medium storing instructions for generating an image of an object of interest, the instructions, when executed, cause the processor to perform the following:

receive a two-dimensional image, the two-dimensional image comprising data that represents an object of interest and data that represents a clutter object;

remove the data that represents the clutter object from the received two-dimensional image by subtracting a two-dimensional representation of the clutter object derived from a volumetric image of a space from the received two-dimensional image, the space comprising the object of interest and the clutter object, the volumetric image comprising multiple voxels with at least one voxel representing the object of interest and at least one voxel representing the clutter object, wherein each voxel is associated with a numerical value; and

present the object of interest without the clutter object by rendering the two-dimensional image without the data that represents the clutter object on the display.

19. The apparatus of claim 18 , wherein the visual appearance of the object of interest changes in response to manipulation of the interface by the user.

20. The apparatus of claim 18 , wherein the interface comprises a tactile interface configured for physical interaction with the user.

21. The apparatus of claim 18 , wherein the two-dimensional representation of the clutter object derived from the volumetric image of the space is a two-dimensional projection of the volumetric image.