Video processing-based body height measurement method

A technology of human height measurement and video processing, applied in the directions of diagnostic recording/measurement, medical science, sensors, etc., can solve the problems of high cost and difficult to promote, and achieve the effect of low cost, good real-time performance and flexible processing

Active Publication Date: 2016-02-03
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] Although the above methods have been improved compared with the traditional measurement methods, they all require special hardware

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  • Video processing-based body height measurement method
  • Video processing-based body height measurement method
  • Video processing-based body height measurement method

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0034] Figure 1a is a schematic diagram of the camera pinhole model. In the camera model, the pinhole imaging model is an approximation suitable for computer vision applications. The pinhole camera completes the central projection, that is, the projection position p of any point P in the image is the intersection of the line OP connecting the focal point O and point P and the image plane.

[0035] Figure 1b The schematic diagram of the pinhole model using the virtual image plane. In practice, the distance between the object and the focal center is generally much longer than the focal length. Therefore, a virtual image plane is set at the symmetrical position of the actual image plane with respect to the focal plane. And map the points on the image plane to the virtual plane via the focal center ...

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Abstract

The invention discloses a video processing-based body height measurement method. According to the method, a monocular camera is taken as a realization platform. Calibration is carried out on an image including reference lines to obtain projection parameters of three reference lines; then a video including a to-be-measured human body is processed. The method comprises the following specific steps: (1) accurately identifying a human body in a video frame; (2) segmenting out a foreground human body by an image processing algorithm; and (3) extracting pixel coordinates of human body feature points (a overhead point and a foot point), and finally inputting data of the projection parameters, the camera height, the feature point pixel coordinates and the like into a core projection algorithm, so as to obtain body height information. According to the method, only an ordinary camera is needed in hardware; the others are achieved by software; the method is simple, feasible and high in reliability; the body height measurement efficiency is greatly improved.

Description

【Technical field】 [0001] The invention relates to the field of computer vision measurement, in particular to a method for measuring human body height based on video processing. 【Background technique】 [0002] Height information is an important part of human body characteristics, and has great application value in medical examination, security, pedestrian recognition and other fields. The traditional way of obtaining height information requires the human body to be measured to stand in a fixed position and use a contact height measuring device to measure height. Although this method has high precision, it has low efficiency, and it is widely used in the security field. , it is impossible to use this method to obtain the height characteristics of the suspect. [0003] Of course, with the development of science and technology, many new measurement methods have emerged, including the use of ultrasonic detectors to measure human body height, and the use of rangefinders and optic...

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Application Information

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IPC IPC(8): A61B5/107
Inventor 王飞周晓姜沛林王迪
Owner XI AN JIAOTONG UNIV
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