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Face part distance measuring method and device and vehicle-mounted terminal

A technology of parts and faces, applied in the field of intelligent driving, can solve the problems such as the inability to measure the face position and so on.

Active Publication Date: 2020-04-03
MOMENTA SUZHOU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has high requirements on the camera hardware equipment, and for the face image collected by the monocular camera, the distance measurement of the face cannot be performed.

Method used

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  • Face part distance measuring method and device and vehicle-mounted terminal
  • Face part distance measuring method and device and vehicle-mounted terminal
  • Face part distance measuring method and device and vehicle-mounted terminal

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Experimental program
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Embodiment approach

[0124] According to the correspondence between each point in the preset face image and each point in the face point cloud model corresponding to the face image, determine the point in the target face point cloud model corresponding to the specified part in the face image, According to the determined coordinates of the point, determine the distance information between the designated part in the face image and the camera.

[0125] Specifically, there is a corresponding relationship between each face image and the points in the face point cloud model corresponding to the face image, for example, the three-dimensional face key points in the face point cloud model correspond to the two-dimensional face key points in the face image Face key points. Therefore, the point in the target face point cloud model corresponding to the specified part in the face image can be determined according to the correspondence between the two-dimensional points in the face image and the three-dimension...

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Abstract

The embodiment of the invention discloses a human face part distance measuring method and device and a vehicle-mounted terminal. The method comprises the following steps: acquiring a face image to besubjected to distance measuring acquired by a camera; according to a plurality of pre-constructed basic face point cloud models and a conversion matrix between the image coordinate system and the camera coordinate system, determining a target weight of each basic face point cloud model capable of fitting to obtain a real face point cloud model, and a target conversion matrix between the head coordinate system and the camera coordinate system; fitting each basic face point cloud model according to each target weight to obtain a real face point cloud model; converting the real face point cloud model into a camera coordinate system according to the target conversion matrix to obtain a target face point cloud model; and according to the target face point cloud model, determining distance information between a specified part in the face image and the camera. By applying the scheme provided by the embodiment of the invention, human face part distance measurement can be carried out on the human face image shot by the monocular camera.

Description

technical field [0001] The present invention relates to the technical field of intelligent driving, in particular to a method, device and vehicle-mounted terminal for measuring distance from human faces. Background technique [0002] When the camera captures the face image, the face image is analyzed to determine the distance information between the face in the face image and the camera, that is, the distance measurement of the face is performed. Facial position ranging can be understood as determining the distance between a human face in a face image and a camera that collects the face image. This distance information can be used in the fields of gaze tracking, object behavior analysis, and the like. For example, according to the distance between the tip of the nose, the corner of the eye and the camera, the gaze point of the human eye can be determined, and then the direction of attention of the person can be obtained. [0003] In the related art, in order to be able to ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V40/161G06V40/168
Inventor 侯喆王晋玮
Owner MOMENTA SUZHOU TECH CO LTD
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