EP 1062555 A4 20010523 - 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
Application
Priority
- US 9901514 W 19990125
- US 2218998 A 19980211
- US 2216498 A 19980211
- US 2206298 A 19980211
- US 2206498 A 19980211
- US 2188998 A 19980211
- US 2178198 A 19980211
- US 2216598 A 19980211
- US 2235498 A 19980211
- US 2206098 A 19980211
- US 2178298 A 19980211
- US 2205998 A 19980211
- US 2220498 A 19980211
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
IPC 8 full level
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 17/05 (2011.01); G06T 17/50 (2006.01)
CPC (source: EP)
G06T 7/0012 (2013.01); G06T 7/11 (2016.12); G06T 2207/10081 (2013.01); G06T 2207/30112 (2013.01)
Citation (search report)
- [XA] US 5630034 A 19970513 - OIKAWA MICHIO [JP], et al
- [XA] EP 0366387 A2 19900502 - GEN ELECTRIC [US]
- [XA] US 4905148 A 19900227 - CRAWFORD CARL R [US]
- See references of WO 9941676A1
Designated contracting state (EPC)
DE GB NL
DOCDB simple family (publication)
WO 9941676 A1 19990819; EP 1062555 A1 20001227; EP 1062555 A4 20010523; JP 2002503816 A 20020205; JP 2005043357 A 20050217
DOCDB simple family (application)
US 9901514 W 19990125; EP 99904247 A 19990125; JP 2000531792 A 19990125; JP 2004207703 A 20040714