Apparatus and method for detecting sheet objects in computed tom

Details Apparatus and method for detecting sheet objects in computed tom Apparatus and method for detecting sheet objects in computed tom

1998-02-11

2000-02-15

Bruce, David Vernon

X-ray or gamma ray systems or devices

Specific application

Absorption

378 4, 378901, 378 15, G01N 2304

Patent

active

060261439

ABSTRACT:
Sheet-shaped objects can be detected by analyzing voxels surrounding a test voxel. If the density different from the mean density then the test voxel is associated with a sheet object. Sheet objects can also be detected by eroding the CT data. Remaining objects are then subtracted from the original data removing with surface voxels, being removed. A connectivity process combines voxels into objects after sheets are detected A dilation function replaces surface voxels removed by erosion. A corrected mass can be compared to mass thresholds to classify the object. Multiple mass thresholds can be used, each of which is associated with a particular density range based on the density of an expected threat object. Bulk objects can be detected by a modified morphological connected components labeling (CCL) approach. A merging process can be used to reconnect related items, 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 rates and/or false alarm rates.

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