Global Patent Index - EP 1062555 A1

EP 1062555 A1 2000-12-27 - COMPUTED TOMOGRAPHY APPARATUS AND METHOD FOR CLASSIFYING OBJECTS

Title (en)

COMPUTED TOMOGRAPHY APPARATUS AND METHOD FOR CLASSIFYING OBJECTS

Title (de)

COMPUTERISIERTES TOMOGRAFIEGERÄT UND VERFAHREN ZUM KLASSIFIZIEREN VON OBJEKTEN

Title (fr)

APPAREIL DE TOMODENSITOMETRIE ET PROCEDE DE CLASSEMENT D'OBJETS

Publication

EP 1062555 A1 (EN)

Application

EP 99904247 A

Priority

  • US 9901514 W
  • US 2218998 A
  • US 2216498 A
  • US 2206298 A
  • US 2206498 A
  • US 2188998 A
  • US 2178198 A
  • US 2216598 A
  • US 2235498 A
  • US 2206098 A
  • US 2178298 A
  • US 2205998 A
  • US 2220498 A

Abstract (en)

[origin: WO9941676A1] A method and apparatus (100) for detecting objects (112) in computed tomography (CT) data are disclosed. Sheet-shaped objects such as sheet explosives can be detected by analyzing the density of test voxel and mean density of its neighborhood voxels. Sheet objects can also be detected by performing erosion and dilation operations. A corrected mass using the mean eroded density of the object can be computed and compared to mass thresholds to classify the object as to whether it poses a threat. Bulk objects can be detected by a modified morphological connected component labeling (CCL) approach which performs a series of erosion and dilation steps to separate adjacent objects in the data such that they can be individually labeled and analyzed. The system can also identify objects that contain liquids. The overall system performance, including overall object detection rate and false alarm rate, can be adjusted by adjusting individual object detection rate and/or false alarm rates.

IPC 1-7 (main, further and additional classification)

G06F 1/00

IPC 8 full level (invention and additional information)

G01N 23/04 (2006.01); G01N 23/06 (2006.01); G01V 5/00 (2006.01); G06F 1/00 (2006.01); G06F 15/00 (2006.01); G06F 19/00 (2006.01); G06K 9/00 (2006.01); G06K 9/46 (2006.01); G06Q 50/00 (2006.01); G06T 5/00 (2006.01); G06T 7/00 (2006.01); G06T 7/60 (2006.01); G06T 11/00 (2006.01); G06T 17/50 (2006.01)

CPC (invention and additional information)

G06T 7/0012 (2013.01); G06T 7/11 (2017.01); G06T 2207/10081 (2013.01); G06T 2207/30112 (2013.01)

Designated contracting state (EPC)

DE GB NL

EPO simple patent family

WO 9941676 A1 19990819; EP 1062555 A1 20001227; EP 1062555 A4 20010523; JP 2002503816 A 20020205; JP 2005043357 A 20050217

INPADOC legal status


2005-02-02 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040803

2001-05-23 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20010405

2001-05-23 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): DE GB NL

2001-05-23 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7G 06F 1/00 A, 7G 06T 5/00 B

2000-12-27 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000911

2000-12-27 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE GB NL