KR100921995B1 - Measurement System - Google Patents

Abstract

According to the present invention, a line scan camera for photographing a subject, a distance measuring and trigger output device for measuring a moving distance of a moving means equipped with a line scan camera and outputting a trigger signal for every fixed moving distance of the moving means, and a line scan Gradient sensor and tilt scan to measure the tilt of the camera The calculation unit that calculates the specification of the subject by using the image provided from the camera and the information provided in the unit of trigger from the distance measurement and trigger output device and the measured value provided from the tilt sensor Disclosed is a system for measuring a standard of a subject using a line scan camera.

According to the disclosed system for measuring the size of a subject using a line scan camera, it is possible to configure the subject measuring system using a single camera, thereby reducing the cost, and allowing easy camera alignment and correction through a simple procedure. Do. In addition, the process of calculating information from an image has a simple and clear advantage.

Line scan camera, height measurement, horizontal measurement, measuring device, measuring system

Description

Standard measurement system for subjects using line scan cameras {Measurement System}

The present invention relates to a measurement system for measuring a standard of a subject, and more particularly, to a system for measuring a standard of a subject using a line scan camera measuring a standard of a subject through an image photographed using a line scan camera. .

In the image photographed with a general camera, the horizontal lengths of the near plane and the far contact plane of the subject, which are actually the same length, appear to be different lengths because of the perspective caused by the vanishing point. That is, the horizontal length of the near surface close to the camera is longer than the horizontal length of the far contact surface far from the camera. In order to know the width and height of the subject in such an image, the distance between the camera and the subject must first be known. Generally, a stereo camera is mainly used to obtain a distance from a camera to a subject. The same subject is photographed using two stereo cameras at regular intervals, and then the distance between the camera and the subject is calculated using triangulation using the two images, and based on the calculated distance information, The width and height of the subject can be obtained by obtaining the ratio of the size change.

However, in order to measure the size of a subject using the above-described stereo camera, two cameras are required, and thus there is a problem of increasing the cost, and there is a difficulty in accurately aligning the two cameras. In addition, in order to calculate the distance from the two images captured by the above method to the subject, an image matching procedure is required through complex image processing, and the measurement result calculated as the distance between the image pickup area and the subject becomes farther away. There is a problem that the error is greatly increased.

The present invention has been made to solve the above-described problems, by obtaining an image of a subject through a standard measurement system of the subject using a single line scan camera, and by minimizing the error of the measured value through this image, An object of the present invention is to provide a system for measuring a standard of a subject using a line scan camera whose configuration is improved to measure a standard.

In order to achieve the above object, a standard measurement system for a subject using a line scan camera of the present invention measures a moving distance between a line scan camera for photographing a subject and a moving means equipped with the line scan camera, The distance measuring and trigger output device for outputting a trigger signal for each moving distance, the tilt sensor for measuring the inclination degree of the line scan camera, the image provided by the line scan camera, and the distance measuring and trigger output device provided in a trigger unit. It includes a calculation unit for calculating the standard of the subject by using the information and the measured value provided by the tilt sensor.

The operation unit may include an image provided from the line scan camera, information provided in a trigger unit from the distance measurement and trigger output device, a measurement value provided from the tilt sensor, and a photographing height H of a pre-measured line scan camera. And a standard measurement system of a subject using a line scan camera, wherein the height y of the subject is calculated using Equation 1 below.

Equation  One

Here, L is the number of vertical pixels of the line scan camera, k is the number of pixels from the bottom of the image to the bottom of the subject, and x is the height of the subject in pixels.

In addition, the calculation unit may use the image provided from the line scan camera, the information provided in units of triggers from the distance measurement and trigger output device, the measured value provided from the tilt sensor, and the horizontal length of the subject using Equation 2 below. It is preferable to include a standard measurement system of a subject using a line scan camera, characterized in that (width) is calculated.

Equation  2

Width of the subject [mm] = Number of horizontal pixels of the subject × Line scan interval of camera [mm]

In addition, the operation unit may include a standard measurement system of a subject using a line scan camera, characterized in that the output function for displaying the specification of the subject is provided.

 According to the standard measurement system of the subject using the line scan camera of the present invention, the system can be configured using a single camera, thereby reducing the cost, and the process of deriving information from the image is simple and clear, and the error of the measured value. There is an advantage that can measure the exact size of the subject to minimize.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

1A and 1B are schematic views of a system for measuring a standard of a subject using a line scan camera 10 according to an exemplary embodiment of the present invention, and FIG. 2 is a diagram of a system for measuring a standard of a subject using a line scan camera 10 in spatial coordinates. The figure shown.

1A and 2, a standard measurement system for a subject using a line scan camera according to an embodiment of the present invention includes a line scan camera 10, a distance measurement and trigger output device 20, a tilt sensor 30, It includes a calculator 40.

A method of measuring the height y of the subject 100 by using the line scan camera 10 will be described below.

As shown in FIGS. 1A and 1B, the system for measuring a subject standard according to the present invention mounts the line scan camera 10 to a moving means to move and capture an image, and the line scan camera 10 has already measured. The line scan camera 10 is fixed in accordance with the installation height (H). In addition, the inclination sensor 30 and the calculator 40 are provided at one side of the line scan camera 10.

Here, the matter to be considered is that the alignment of the line scan camera 10 should be horizontally aligned so as to be parallel to the ground surface. However, it is inevitable that the line scan camera 10 is fixed to the moving means actually moved, and the horizontal alignment of the line scan camera 10 is disturbed due to the vertical vibration generated while the moving means moves. Therefore, in order to correct this, it is necessary to measure a tilt change value (a level of horizontal alignment) caused by vertical vibration of the line scan camera 10, which is a tilt sensor 30 provided in the line scan camera 10. ) Can be measured. Using the data on the change value of the horizontal alignment state of the line scan camera 10 obtained from the inclination sensor 30, it is possible to know the degree of inclination of the captured image up and down, the change in the tilt of the line scan camera By reconstructing the image by setting an upper and lower offset of the captured image according to the value, the error of the measured value due to the horizontal alignment of the line scan camera 10 may be corrected.

Meanwhile, the line scan camera 10 is fixedly installed at a predetermined height H, and moves in parallel with the subject 100 to capture the subject 100. Here, one side of the moving means is provided with the distance measuring and trigger output device 20 to measure the moving distance of the moving means, and transmits a trigger output signal to the line scan camera in proportion to a constant moving distance of the moving means. Accordingly, the line scan camera 10 receiving the trigger output signal from the distance measurement and trigger output device 20 captures the image of the subject 100 at a predetermined distance interval based on the trigger output signal.

In addition, as shown in FIG. 3, the operation unit 40 receives and stores a 2D image captured by the line scan camera 10, and receives a result value measured by the tilt sensor 30. The image of the image received from the line scan camera 10 is reconstructed and corrected. As described above, the operation unit 40 calculates the height and width of the subject through a process of comprehensively calculating the information transmitted from each component and correcting the error.

 In this case, the operation unit 40 preferably has an output function for displaying the standard of the subject.

On the other hand, if the positional relationship between the subject and the image captured after the line scan camera 10 is installed on the plane of the XZ axis, it can be expressed as shown in FIG. Each variable of FIG. 2 has the following meaning.

H: height from the ground to the camera

L: Number of vertical pixels of camera

k: Number of pixels from the bottom of the image to the bottom of the subject

x: Subject height in the image

y: the actual height of the subject

Where y is a function of x and k.

Equation  One

Becomes Where H and L are known constants, and k and x can simply be calculated in the image.

Therefore, by using Equation 1, the vertical height y of the subject can be easily calculated from the image acquired using the line scan camera 10.

Meanwhile, a method of measuring the horizontal length of the subject 100 using the line scan camera 10 will be described below.

In order to measure the height (y) of the above-described subject, the equipment is installed in the same state as the arrangement of the equipment included in the measurement system, and the imaging interval is set so that the line scan camera 10 is photographed at a predetermined moving distance. do. For example, when the trigger output interval according to the movement distance is set to 1 mm in the distance measuring and trigger output device 20, the distance measuring and trigger output device 20 moves 1 mm every time the 1 mm is moved. When the output signal is sent to the line scan camera 10, each time the line scan camera 10 receives an output signal of one trigger, one line is photographed in units of one line arranged in a vertical direction. . Therefore, in the image taken by the line scan camera 10, one pixel in the horizontal direction (or the distance between one line arranged in the vertical direction and another line) corresponds to a distance of exactly 1 mm. Done.

By using this point, the horizontal length of the subject can be easily calculated from the acquired image. That is, if only the number of horizontal pixels (number of lines) of the subject can be measured in the image regardless of the perspective, the horizontal length of the subject can be obtained by the following equation (2). Here, the initial point in the horizontal pixel number (the number of lines) is not included in the number.

Equation  2

Width of the subject [mm] = Number of horizontal pixels of the subject × Line scan interval of camera [mm]

As mentioned above, although this invention was demonstrated by the limited embodiment, this invention is not limited by this and it will be described below by the person of ordinary skill in the art, and the following. Of course, various modifications and variations are possible within the scope of the claims.

1A and 1B are schematic diagrams illustrating a standard measurement system of a subject using a line scan camera;

2 is a spatial coordinate showing a standard measurement system of a subject using a line scan camera;

3 is an overall configuration diagram of a standard measurement system of a subject using a line scan camera.

<Explanation of symbols for the main parts of the drawings>

10 ... line scan camera 20 ... distance measurement and trigger output

30.Tilt sensor 40 ... Operating part

50 Wheel of transport means 100 ... Subject (object to be measured)

Claims (4)

In the measurement system for measuring the standard of the subject, A line scan camera 10 for photographing a subject; A distance measuring and trigger output device 20 for measuring a moving distance of a moving means equipped with the line scan camera and outputting a trigger signal for each fixed moving distance of the moving means; An inclination sensor 30 measuring an inclination degree of the line scan camera; And Comprising a calculation unit 40 for calculating the specification of the subject using the image provided from the line scan camera, the information provided in the trigger unit in the distance measurement and trigger output device and the measured value provided from the tilt sensor Understand, The calculating unit may include an image provided from the line scan camera, information provided in a trigger unit from the distance measurement and trigger output device, a measurement value provided from the inclination sensor, and a photographing height H of the line scan camera previously measured. A system for measuring a standard of a subject using a line scan camera, wherein the height y of the subject is calculated using Equation 1 below.

Here, L is the number of vertical pixels of the line scan camera, k is the number of pixels from the bottom of the image to the bottom of the subject, and x is the height of the subject in pixels. delete The method of claim 1, The calculating unit 40 calculates the horizontal length (width) of the subject using the image provided from the line scan camera, the information provided in units of triggers from the distance measurement and trigger output device, and the following equation (2). A system for measuring the size of a subject using a line scan camera. Width of the subject [mm] = Number of horizontal pixels of the subject × Line scan interval of camera [mm] The method according to claim 1 or 3, The calculation unit 40 is a standard measurement system of a subject using a line scan camera, characterized in that it comprises an output function for displaying the specification of the subject.

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