CN104720814A - Non-contact height automatic measuring system and non-contact height automatic measuring method - Google Patents

Abstract

The invention discloses a non-contact height automatic measuring system. The non-contact height automatic measuring system comprises a camera, a calibration flat plate, a calibration module, an ultrasonic distance measuring module and a height measuring module, wherein the camera is used for acquiring calibration parameter images from the calibration flat plate and shooting an image of a person whose height is about to be measured; the calibration module is used for calibrating parameters through the calibration flat plate and the camera; the ultrasonic distance measuring module is controlled by the height measuring module and is used for judging the distance from the person whose height is about to the measured to a measuring system; and the height measuring module is used for analyzing and calculating data information acquired by the modules so as to obtain final height data. The non-contact height automatic measuring system is simple in structure and is operated full-automatically; and when the position of the person is changed relative to the camera, accurate height measurement data can still be acquired.

Description

Noncontact automatic height measuring system and method

Technical field

The present invention relates to electronic health care station equipment, particularly relate to a kind of electronic health station system with collective advertising information display function.

Background technology

At present, traditional height measurement method adopts the measured barefoot, and " attentioning " posture stands on the base plate of height measure, near on the column of height measure between heel, sacral region and two omoplates.Gauger stands in the left and right of measured people, its head is adjusted to tragus upper limb and flushes with the minimum point of inferior orbital margins, then moves the crown of horizontal plate to measured people of height measure, makes its elasticity suitable, can measure height.But it is lower to measure efficiency, and error is larger.Though patent CN201020652664.3 automatic height measuring system solves the problem that traditional height is measured, when measured carry out movable after, cannot to carry out effectively, height measurement accurately.

Summary of the invention

Based on above-mentioned technical problem, the present invention proposes a kind of noncontact automatic height measuring system, this system can realize the automatic measurement to Human Height, solve simultaneously measured move forward and backward after height measure.

A kind of noncontact automatic height measuring system provided by the invention, comprises camera, demarcates flat board, demarcating module, ultrasonic distance measuring module and height measurement module;

Described camera, for gathering calibrating parameters image and shooting height gauger image from described demarcation flat board;

Described demarcating module, realizes parameter calibration by described demarcation flat board and described camera;

Described ultrasonic distance measuring module is controlled by height measurement module, for judging the distance between measured and measuring system;

Described height measurement module, for analyzing the data message obtained from above-mentioned module, calculating, obtains final height data.

The present invention also proposes a kind of noncontact height method for automatic measurement, and the method comprises the following steps:

Step one, to demarcate one before flat board is placed in camera, demarcate on flat board and have a known length to be h _markmark;

Step 2, to be measured described demarcation by ultrasonic distance measuring module dull and stereotyped with camera distance d _mark;

The switch of step 3, control serial ports reads 10 groups of data at every turn, is converted into distance value, and final measurement imports demarcating module as a parameter;

Step 4, control collected by camera demarcate dull and stereotyped pictures taken;

Step 5, demarcation thing are L demarcating length corresponding in plane _mark, then L _mark=n _mark* d _pix, n _markrepresent its pixel count in the picture, d _pixrepresent the size that each pixel is corresponding;

Step 6, by h _mark(n _mark* d _pix)=d _markf imports in height measurement module;

When step 7, measured stand in before photographic head, start height measurement module; Height measurement module, when measuring, controls ultrasonic distance measuring module and records people and camera distance d, controls collected by camera portrait picture;

The vertical coordinate y that Treatment Analysis obtains portrait peak is carried out to portrait picture,

H=h _camera+ [(y-d _vertical2) * d _pix] * df, d _verticalfor camera longitudinal axis resolution;

By the functional relationship in demarcating module, divide out f, namely obtains the final measurement of height

H=h _camera+ [(y-d _mark2) * d] (n _mark* d _mark) * h _mark;

H=[(y-d in formula _mark2) * d] (n _mark* d _mark) * h _markfor the length of human body part more than camera optical axis, after human motion, in formula, the corresponding numerical value of y and d changes, (y-d _mark2) * d equals hfd all the time _pix, when distance d changes, measurement obtains h value and does not change.

Compared with prior art, structure of the present invention is simple, and full-automatic Self-operating, when position changes between human body and photographic head, still can obtain height measurement data accurately.

Accompanying drawing explanation

Fig. 1 is noncontact automatic height measuring system structure chart of the present invention;

Fig. 2 is the camera imaging figure of noncontact automatic height measuring system of the present invention;

Fig. 3 is the actual measurement of noncontact automatic height measuring system of the present invention and demarcation image.

Detailed description of the invention

Below in conjunction with accompanying drawing and preferred embodiment, to according to detailed description of the invention provided by the invention, structure, feature and effect thereof, be described in detail as follows.

By demarcating module, Internal system parameters is demarcated, before a flat board is placed in camera, flat board has a known length be h _markmark.Itself and camera distance d is measured by ultrasonic distance measuring module _mark, the every 10ms of ultrasonic distance measuring module itself once finds range, and after completing range finding, exports distance value with the form of serial ports; By matlab coding, control the switch of serial ports, each reading 10 groups of data, be converted into distance value according to communications protocol, cast out wherein irrational data, average as final measurement to remaining data, using measurement result as a parameter, import demarcating module.Control the dull and stereotyped picture of collected by camera.The length that mark is corresponding in phase plane is L _markif use n _markrepresent its pixel count in the picture, d _pixrepresent the size that each pixel is corresponding, then L _mark=n _mark* d _pix.N _markn can be obtained by carrying out Treatment Analysis to lithograph picture _mark(binary conversion treatment is carried out to image; Sobel operator is used to carry out rim detection; Accept or reject by size detecting the enclosed region obtained, the only region of reservation flag thing on image; Use regionprops function to obtain the minimum rectangle of surrounding mark region, its long limit pixel count is n _mark), to obtain focal distance f and d _pixbetween proportionate relationship, and carry out system log (SYSLOG) in real time, easily known by geometrical relationship, h _mark(n _mark* d _pix)=d _markf.This functional relationship is imported in height measurement module.When measured stands in before photographic head, start height measurement module, control ultrasonic distance measuring module and measure people and camera distance d, control collected by camera portrait picture.The vertical coordinate y(that Treatment Analysis obtains portrait peak is carried out to portrait picture gray processing process is carried out to image, reject background; Binaryzation is carried out to image, by opening operation, removes tiny ledge), easily know H=h by schematic diagram geometrical relationship _camera+ [(y-d _vertical2) * d _pix] * df, d _verticalfor camera longitudinal axis resolution (if resolution is the camera of 640*480, its d _verticalbe 480).By the functional relationship in demarcating module, divide out f, can obtain final measurement H=h _camera+ [(y-d _mark2) * d] (n _mark* d _mark) * h _mark.H=[(y-d in formula _mark2) * d] (n _mark* d _mark) * h _markfor the length of human body part more than camera optical axis, as shown in Figure 2, after human motion, in formula, the corresponding numerical value of y and d changes, and is easily known, (y-d by simple geometric relationships (similar triangles) _mark2) * d equals hfd all the time _pix, when distance d changes, measurement obtains h value and does not change.

In Fig. 2, coordinate system oxyz is camera coordinates system, and XfOfYf is camera imaging plane, and OXYZ is object coordinates system.

Claims (2)

1. a noncontact automatic height measuring system, is characterized in that, comprises camera, demarcates flat board, demarcating module, ultrasonic distance measuring module and height measurement module;

Described camera, for gathering calibrating parameters image and shooting height gauger image from described demarcation flat board;

Described demarcating module, realizes parameter calibration by described demarcation flat board and described camera;

Described ultrasonic distance measuring module is controlled by height measurement module, for judging the distance between measured and measuring system;

Described height measurement module, for analyzing the data message obtained from above-mentioned module, calculating, obtains final height data.

2. a noncontact height method for automatic measurement, it is characterized in that, the method comprises the following steps:

Step one, to demarcate one before flat board is placed in camera, demarcate on flat board and have a known length to be h _markmark;

Step 2, to be measured described demarcation by ultrasonic distance measuring module dull and stereotyped with camera distance d _mark;

The switch of step 3, control serial ports reads 10 groups of data at every turn, is converted into distance value, and final measurement imports demarcating module as a parameter;

Step 4, control collected by camera demarcate dull and stereotyped pictures taken;

Step 5, demarcation thing are L demarcating length corresponding in plane _mark, then L _mark=n _mark* d _pix, n _markrepresent its pixel count in the picture, d _pixrepresent the size that each pixel is corresponding;

Step 6, by h _mark(n _mark* d _pix)=d _markf imports in height measurement module;

When step 7, measured stand in before photographic head, start height measurement module; Height measurement module, when measuring, controls ultrasonic distance measuring module and records people and camera distance d, controls collected by camera portrait picture;

The vertical coordinate y that Treatment Analysis obtains portrait peak is carried out to portrait picture,

H=h _camera+ [(y-d _vertical2) * d _pix] * df, d _verticalfor camera longitudinal axis resolution;

By the functional relationship in demarcating module, divide out f, namely obtains the final measurement of height

H=h _camera+ [(y-d _mark2) * d] (n _mark* d _mark) * h _mark;

H=[(y-d in formula _mark2) * d] (n _mark* d _mark) * h _markfor the length of human body part more than camera optical axis, after human motion, in formula, the corresponding numerical value of y and d changes, (y-d _mark2) * d equals hfd all the time _pix, when distance d changes, measurement obtains h value and does not change.