Non-contact neck-based respiratory and pulse signal detection method, apparatus, and imaging device
The present disclosure provides a non-contact neck-based respiratory and pulse signal detection method and apparatus, and an imaging device. The method includes: acquiring 3D morphological information of a neck of a human body in real-time; and acquiring a respiratory signal and an electrocardiogram signal of the human body on the basis of the 3D morphological information of the neck.
1. A non-contact optic-based and neck-based respiratory and pulse signal detection method, comprising:
acquiring three-dimensional (3D) morphological information of a neck of a human body; and
obtaining a respiratory signal and an electrocardiogram signal of the human body according to the 3D morphological information of the neck of the human body;
wherein acquiring the 3D morphological information of the neck of the human body, comprises: obtaining a height h of the neck of the human body by making a line connecting optical centers of a camera and a projector to be parallel to a reference plane, and making an optical axis of the camera to be vertical to the reference plane;
wherein the height h of the neck of the human body is calculated by
h
=
H
*
H
*
d
v
*
L
+
H
*
d
,
where H is a distance between axes of the camera and the projector, L is a distance from the camera to the reference plane, v is an image distance, and d is an aberration of laser projection on the reference plane and an object surface photographed by the camera.
2. The method of claim 1 , further comprising:
projecting, by the projector, structured light covering full view towards the neck of the human body, in which light emitted by the projector is visible light or invisible infrared light, and the visible light or invisible infrared light is constant structured light; and
obtaining the 3D morphological information of the neck of the human body by processing and identifying an optical pattern photographed by the camera and in combination with morphology parameters obtained by calibration.
3. The method of claim 1 , wherein H, v, and L are determined through calibration and a known standard pattern.
4. A non-contact optic-based and neck-based respiratory and pulse signal detection apparatus, comprising:
a processor; and
a memory, configured to store instructions executable by the processor,
wherein the processor is configured to run a program corresponding to the instructions by reading the instructions stored in the memory, so as to:
acquire three-dimensional (3D) morphological information of a neck of a human body; and
obtain a respiratory signal and an electrocardiogram signal of the human body according to the 3D morphological information of the neck of the human body;
wherein the processor is configured to acquire the 3D morphological information of the neck of the human body by obtaining a height h of the neck of the human body by controlling a line connecting optical centers of a camera and a projector to be parallel to a reference plane, and controlling an optical axis of the camera to be vertical to the reference plane;
wherein the height h of the neck of the human body is calculated by
h
=
H
*
H
*
d
v
*
L
+
H
*
d
,
where H is a distance between axes of the camera and the projector, L is a distance from the camera to the reference plane, v is an image distance, and d is an aberration of laser projection on the reference plane and an object surface photographed by the camera.
5. The apparatus of claim 4 , wherein the processor is further configured to:
control the projector to project structured light covering full view towards the neck of the human body, in which light emitted by the projector is visible light or invisible infrared light, and the visible light or invisible infrared light is constant structured light; and
obtain the 3D morphological information of the neck of the human body by processing and identifying an optical pattern photographed by the camera and in combination with morphology parameters obtained when calibration.
6. The apparatus of claim 4 , wherein H, v, and L are determined through calibration and a known standard pattern.
7. A medical imaging device, comprising:
a projector, configured to project structured light towards a neck of a human body, in which light emitted by the projector is visible light or invisible infrared light, and the visible light or invisible infrared light is constant structured light;
a camera, configured to photograph an optical pattern of the neck of the human body;
a controller, configured to control a line connecting optical centers of the camera and the projector to be parallel to a reference plane, and control an optical axis of the camera to be vertical to the reference plane; and
a processor, configured to obtain three-dimensional (3D) morphological information of the neck of the human body based on the optical pattern photographed by the camera, and to obtain a respiratory signal and an electrocardiogram signal of the human body according to the 3D morphological information of the neck of the human body;
wherein the processor is configured to obtain the 3D morphological information of the neck of the human body by obtaining a height h of the neck of the human body by
h
=
H
⋆
H
⋆
d
v
⋆
L
+
H
⋆
d
,
where H is a distance between axes of the camera and the projector, L is a distance from the camera to the reference plane, v is an image distance, and d is an aberration of laser projection on the reference plane and an object surface photographed by the camera.
8. The medical imaging device of claim 7 , wherein H, v, and L are determined through calibration and a known standard pattern.