Systems and methods for determining feature height from laminographic images

Patent metadata

Field	Value
Publication number	US-2016358037-A1
Application number	US-201514731912-A
Country	US
Kind code	A1
Filing date	Jun 5, 2015
Priority date	Jun 5, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

A method for determining a height of a feature of an object is provided. The method includes generating, using a computing device, on an image of a scan volume that includes the object, a marker that crosses an edge of the feature, calculating, using the computing device, for each of a plurality of laminographic images, a profile along the generated marker, each laminographic image having an associated height, computing, using the computing device, an edge slope associated with the feature for each of the plurality of profiles, identifying, using the computing device, a focused laminographic image as the laminographic image of the plurality of laminographic images having the steepest edge slope, and determining the height of the object as the height associated with the focused laminographic image.

First claim

What is claimed is:

1 . A method for determining a height of a feature of an object, said method comprising:
generating, using a computing device, on an image of a scan volume that includes the object, a marker that crosses an edge of the feature; calculating, using the computing device, for each of a plurality of laminographic images, a profile along the generated marker, each laminographic image having an associated height; computing, using the computing device, an edge slope associated with the feature for each of the plurality of profiles; identifying, using the computing device, a focused laminographic image as the laminographic image of the plurality of laminographic images having the steepest edge slope; and determining the height of the object as the height associated with the focused laminographic image.

2 . A method in accordance with claim 1 , wherein generating a marker comprises generating a marker based on a user input identifying the marker.

3 . A method in accordance with claim 1 , wherein generating a marker comprises automatically generating the marker using the computing device.

4 . A method in accordance with claim 1 , further comprising generating the plurality of laminographic images using an imaging system.

5 . A method in accordance with claim 1 , wherein the edge slope of each profile is a maximum slope associated with the profile.

6 . A method in accordance with claim 1 , further comprising displaying the focused laminographic image.

7 . A method in accordance with claim 1 , wherein each profile is an x-ray attenuation profile.

8 . A processing device for determining a height of a feature of an object, said processing device configured to cause a computer to implement a method including:
generating, on an image of a scan volume that includes the object, a marker that crosses an edge of the feature; calculating, for each of a plurality of laminographic images, a profile along the generated marker, each laminographic image having an associated height; computing an edge slope associated with the feature for each of the plurality of profiles; identifying a focused laminographic image as the laminographic image of the plurality of laminographic images having the steepest edge slope; and determining the height of the object as the height associated with the focused laminographic image.

9 . A processing device in accordance with claim 8 , wherein generating a marker comprises generating a marker based on a user input identifying the marker.

10 . A processing device in accordance with claim 8 , wherein generating a marker comprises automatically generating the marker.

11 . A processing device in accordance with claim 8 , wherein the edge slope of each profile is a maximum slope associated with the profile.

12 . A processing device in accordance with claim 8 , wherein said processing device is further configured to cause the computer to display the focused laminographic image.

13 . A processing device in accordance with claim 8 , wherein each profile is an x-ray attenuation profile.

14 . A system for determining a height of a feature of an object, the system comprising:
an imaging device; and a computing device communicatively coupled to said imaging device, said computing device configured to:
generate, on an image of a scan volume that includes the object, a marker that crosses an edge of the feature;
calculate, for each of a plurality of laminographic images, a profile along the generated marker, each laminographic image having an associated height;
compute an edge slope associated with the feature for each of the plurality of profiles;
identify a focused laminographic image as the laminographic image of the plurality of laminographic images having the steepest edge slope; and
determine the height of the object as the height associated with the focused laminographic image.

15 . A system in accordance with claim 14 , wherein to generate a marker, said computing device is configured to generate a marker based on a user input identifying the marker.

16 . A system in accordance with claim 14 , wherein to generate a marker, said computing device is configured to automatically generate the marker.

17 . A system in accordance with claim 14 , wherein the edge slope of each profile is a maximum slope associated with the profile.

18 . A system in accordance with claim 14 , wherein said computing device is further configured to display the focused laminographic image.

19 . A system in accordance with claim 14 , wherein each profile is an x-ray attenuation profile.

20 . A system in accordance with claim 14 , wherein said imaging device is a computed tomography imaging system configured to acquire the plurality of laminographic images.

Assignees

• Morpho Detection Llc

Inventors

• Hopkins Forrest Frank
• Bueno Clifford
• Garms Walter I

Classifications

• G06V20/00 Primary

  Scenes; Scene-specific elements (control of digital cameras H04N23/60) · CPC title

• G06T7/0012

  Biomedical image inspection · CPC title

• G06V10/457

  by analysing connectivity, e.g. edge linking, connected component analysis or slices · CPC title

• G06T2207/30204

  Marker · CPC title

• G06T2207/10081

  Computed x-ray tomography [CT] · CPC title