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Millimeter-wave terahertz multi-polarization imaging method and imaging system for contour marking

An imaging method, millimeter-wave technology, applied in the field of millimeter-wave terahertz imaging systems, can solve the problem of insufficient recognition of concealed objects, and achieve the effect of improving the ability to detect and identify concealed objects

Active Publication Date: 2021-08-24
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing detection methods only distinguish between human bodies and hidden objects based on the contrast of grayscale images, and the recognition of hidden objects is not high enough

Method used

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  • Millimeter-wave terahertz multi-polarization imaging method and imaging system for contour marking
  • Millimeter-wave terahertz multi-polarization imaging method and imaging system for contour marking
  • Millimeter-wave terahertz multi-polarization imaging method and imaging system for contour marking

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Embodiment Construction

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of example embodiments. communicated to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0038] Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically separate entities. These functi...

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Abstract

The invention discloses a millimeter-wave terahertz multi-polarization imaging method for contour marking and a millimeter-wave terahertz imaging system. The brightness temperature image of the human body at k linear polarization angles is obtained through the imaging system, and then noise reduction and / or interpolation processing is performed on the brightness temperature image, and then the brightness temperature image is converted into a fully horizontally polarized brightness temperature image T Ah and the fully vertically polarized brightness temperature image T Av , then according to T Ah and T Av The adjustable linear polarization ratio image ALPR is calculated and generated. Finally, the segmentation threshold δ is calculated according to the image statistical characteristics of the image ALPR, and the pixels whose pixel value is not less than δ in the image ALPR are marked. Finally, the human body and the hidden objects carried by the human body can be obtained. Outline image. The present invention enhances the concealed objects and marks the contour edge of the concealed objects by utilizing the difference of polarization characteristics between the concealed objects and the terahertz thermal radiation of the human body. The algorithm is simple and efficient.

Description

technical field [0001] The present disclosure relates to the technical field of millimeter-wave / terahertz remote sensing and detection, and in particular, to a millimeter-wave terahertz multi-polarization imaging method for contour marking and a millimeter-wave terahertz imaging system implementing the imaging method. Background technique [0002] Carrying dangerous goods by the human body is one of the main factors that endanger public safety, and human body security inspection has always been a research problem at home and abroad. Millimeter wave / terahertz imaging has the characteristics of good penetrability to clothing, no harm to the human body, and intuitive images. It is one of the important technical means for human body security inspection. [0003] Since the end of the last century, millimeter-wave / terahertz human body security imaging systems have developed rapidly. A large number of prototypes and experiments have shown the feasibility and great potential of pass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/89G01V8/10
CPCG01S17/89G01V8/005G01V8/10
Inventor 赵自然程亚运王迎新陈志强李元景
Owner TSINGHUA UNIV