Pressing position positioning and pressure measuring method based on light volume change tracing imaging

Abstract

The invention discloses a pressing position positioning and pressure measuring method based on light volume change tracing imaging, and the method does not need a pressure sensor, only needs a camera, and can carry out the positioning of a pressing area and the measurement of a pressure value. Before measurement is started, only one-time simple calibration work is needed, light volume signal characteristics corresponding to diastolic pressure and systolic pressure disappear one by one along with gradual increase of pressing force, two groups of pressure values and corresponding light volume signal intensity values are recorded, and a relation curve of pressure and blood light volume change can be fitted. Through the relation curve, pressure values corresponding to different blood light volume signal intensities can be obtained. Different from a traditional technical route, the invention provides a non-contact measurement method for determining the pressing position and measuring the pressure through a camera. The method is simple, a pressure sensor does not need to be installed, and a plurality of pressing areas can be flexibly and conveniently measured on the surface of any object.

Description

technical field [0001] The invention belongs to the field of machine vision analysis of limb photoplethysmography signals, and in particular relates to a pressing position positioning and pressure measurement method based on photoplethysmography imaging. Background technique [0002] In touch interaction, the realization of traditional pressure sensing needs to rely on setting specific pressure sensing devices on the pressing surface. The sensor device contains elements that generate strain with pressure, and the pressure can be sensed by measuring the corresponding parameters of the element (such as resistance, capacitance, etc.). To determine the absolute value of the pressure through the sensor, it is necessary to calibrate the sensor before use to calibrate the signal characteristics corresponding to the specific pressure. Such a calibration operation is time-consuming, laborious, and complicated, and may drift over time, making measurements inaccurate. [0003] If the...

AI Technical Summary

Problems solved by technology

Such calibration operations are time-consuming, complex and can drift over time making measurements inaccurate

[0003] If the traditional press measurement technology wants to locate the spatial position of the touch point, a set of sensor arrays is required, and the response characteristics of different sensor units in the array are required to have a high consistency. The resulting problem is that the spatial resolution is usually The accuracy of the positioning position is low, and the complexity and cost of the device will increase, which will bring inconvenience to large-scale use

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