发明名称 |
3-dimensional model creation methods and apparatuses |
摘要 |
Disclosed are methods and apparatuses for creating a 3-Dimensional model for objects in an inspected luggage in a CT system. The method includes acquiring slice data of the luggage with the CT system; interpolating the slice data to generate 3D volume data of the luggage; performing unsupervised segmentation on the 3D volume data of the luggage to obtain a plurality of segmental regions; performing isosurface extraction on the plurality of segmental regions to obtain corresponding isosurfaces; and performing 3D surface segmentation on the isosurfaces to form a 3D model for the objects in the luggage. The above solutions can create a 3D model for objects in the inspected luggage in a relatively accurate manner, and thus provide better basis for subsequent shape feature extraction and security inspection, and reduce omission factor. |
申请公布号 |
US9557436(B2) |
申请公布日期 |
2017.01.31 |
申请号 |
US201314138447 |
申请日期 |
2013.12.23 |
申请人 |
Tsinghua University;Nuctech Company Limited |
发明人 |
Chen Zhiqiang;Zhang Li;Zhao Ziran;Li Qiang;Gu Jianping;Huang Qingping |
分类号 |
G06T17/00;G01V5/00;G06T7/00;G06K9/00 |
主分类号 |
G06T17/00 |
代理机构 |
Merchant & Gould P.C. |
代理人 |
Merchant & Gould P.C. |
主权项 |
1. A method for creating a 3-Dimensional model for objects in an inspected luggage in a CT system, comprising:
acquiring slice data of the luggage with the CT system; interpolating the slice data to generate 3D volume data of the luggage; performing unsupervised segmentation on the 3D volume data of the luggage to obtain a plurality of segmental regions; performing isosurface extraction on the plurality of segmental regions to obtain corresponding isosurfaces; and performing 3D surface segmentation on the isosurfaces to form a 3D model for the objects in the luggage; wherein the unsupervised segmentation is performed by using a Statistical Region Merging (SRM) algorithm which is extended into 3D processing by:
joining an atomic number and density of the 3D volume data into a vector so as to represent a 3D voxel as two vectors and replacing a grey difference in a conventional SRM with a module of a difference vector between the two vectors, replacing a 2D gradient in the conventional SRM with a 3D gradient, and replacing an area of a pixel in a 2D region in the conventional SRM with a volume of a voxel. |
地址 |
Haidian District, Beijing CN |