CN209147948U - Profile measurement device based on line light source - Google Patents

Abstract

The utility model discloses a profile measuring device based on a line light source, which comprises a loading platform, an image acquisition terminal, a control and processing terminal, at least one first line light source and at least one second line light source. There is a measurement area on the loading platform, and the object to be measured is placed in the measurement area. The first line light source and the second line light source are respectively used to project the first light source line and the second light source line to the measured object, and the first line light source is arranged along the direction of the second light source line, and the second line light source is arranged along the direction of the first light source line arrangement. The image collection terminal is used to collect the projection images projected by the first line light source and the second line light source on the object to be measured, and the first and second line light sources and the optical axis of the image collection terminal respectively have a first preset angle and The second preset angle. The control and processing terminal is configured to calculate the three-dimensional contour of the object to be measured according to the positional relationship between the first line light source and the second line light source and the image acquisition terminal. The utility model can effectively improve the scanning accuracy of the measured object.

Description

Profile measurement device based on line light source

technical field

The utility model relates to the technical field of three-dimensional measurement, in particular to a contour measurement device based on a line light source.

Background technique

Detecting the three-dimensional contour of an object based on a line light source is a common detection method. Most of them use a line light source, and the detection speed is relatively slow. In order to meet the needs of rapid detection in production and to quickly detect the contours of objects in both horizontal and vertical directions at the same time, two mutually perpendicular line light sources are used for scanning.

However, since the cross-hair light source has only one light source emission position, if the plane of the stage is perpendicular to the optical axis of the camera, when two vertical light source lines are obtained on the camera image, there will be a surface formed by the light source line and the light source and the optical axis of the camera. Coplanar or parallel, when the light source surface and the camera optical axis are coplanar, the 3D information cannot be detected, and when the light source surface is parallel to the camera optical axis, the 3D detection accuracy will also be poor. And because the cross-line light source cannot independently control the brightness of each line light source, due to the different surface reflectivity of different materials, the brightness of the two lines will vary greatly, so that the best detection effect cannot be achieved at the same time.

Utility model content

Aiming at the problems existing in the prior art, the main purpose of the present invention is to provide a profile measuring device based on a line light source, which aims to improve the scanning speed and scanning effect of the measured object.

In order to achieve the above purpose, the profile measurement device based on the line light source proposed by the present invention includes: a loading platform, at least one first line light source, at least one second line light source, an image acquisition terminal, and a control processing terminal. A measurement area is provided on the object platform, and the object to be measured is placed in the center of the measurement area. The first line light source is used to project the first light source line to the measured object, the second line light source is used to project the second light source line to the measured object, and the second light source line intersects the first light source line. The image acquisition terminal is used for The projection images projected by the first line light source and the second line light source on the object to be measured are collected, and the optical axis of the image collection terminal passes through the center position of the measurement area. In addition, a first preset angle exists between the first line light source and the optical axis of the image acquisition terminal, and a second preset angle exists between the second line light source and the optical axis of the image acquisition terminal. The control and processing terminal is configured to calculate the three-dimensional contour of the object to be measured according to the positional relationship between the first line light source and the second line light source and the image acquisition terminal.

In some embodiments of the present invention, the first preset angle is between 0° and 80°.

In some embodiments of the present invention, the second preset angle is between 0° and 80°.

In some embodiments of the present invention, the first light source line projected by the first linear light source is parallel to the horizontal direction of the image acquisition terminal, and the second light source line projected by the second linear light source is parallel to the image acquisition terminal. The vertical directions of the terminals are parallel.

In some embodiments of the present invention, the first line light source and the second line light source are both in-line line lasers or line array light sources.

The technical scheme of the utility model adopts two sets of mutually independent line light sources, each group of line light sources includes at least one line light source, and each line light source can control the brightness and switch independently, and can adjust the difference according to the different reflectivity of the surface of the tested object. The brightness of the line light source ensures the best test effect; by using multiple line light sources, the position of each line light source can be set independently, so that the light source surface formed by the light source projected by each line light source and the optical axis of the image acquisition terminal There is a certain preset angle, which avoids the situation that the light source surface and the optical axis of the image acquisition terminal are parallel or coplanar caused by the use of a line light source.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without any creative effort.

1 is a schematic structural diagram of a first embodiment of a profile measuring device based on a line light source of the present invention;

FIG. 2 is a state matter diagram of the first line light source and the second line light source projected on the square hole workpiece;

3 is a schematic structural diagram of a second embodiment of a contour measuring device based on a line light source of the present invention;

4 is a schematic diagram of the state in which the first line light source and the second line light source are projected on the mobile phone case;

The purpose realization, functional characteristics and advantages of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The utility model provides a contour measuring device based on a line light source.

Referring to FIG. 1 or FIG. 3 , FIG. 1 is a schematic structural diagram of the first embodiment of the contour measuring device based on the line light source of the present invention, and FIG. 3 is the structural schematic diagram of the second embodiment of the contour measuring device based on the line light source of the present invention.

As shown in FIG. 1 or FIG. 3 , in an embodiment of the present invention, the profile measurement device based on a line light source includes: a loading platform 400 , at least one first line light source 210 , at least one second line light source 220 , and an image acquisition terminal 100, and the control processing terminal 300. Wherein, the object loading platform 400 is provided with a measurement area, and the object to be measured is placed in the center of the measurement area. The first line light source 210 is used to project the first light source line 212 to the measured object, the second line light source 220 is used to project the second light source line 222 to the measured object, and the second light source line 222 intersects with the first light source line 212 and forms The intersection point is projected on the measured object. The image collection terminal 100 is used to collect the projection images projected by the first line light source 210 and the second line light source 220 on the measured object, and the optical axis of the image collection terminal 100 passes through the center of the measurement area. There is a first preset angle between the first linear light source 210 and the optical axis of the image acquisition terminal 100 , so that the light source surface 211 formed by the light source lines projected by the first linear light source 210 forms a preset angle with the optical axis of the image acquisition terminal 100 a. There is a second preset angle between the second linear light source 220 and the optical axis of the image acquisition terminal 100 , so that the light source surface 221 formed by the light source lines projected by the second linear light source 220 forms a preset angle β with the optical axis of the image acquisition terminal 100 . The control and processing terminal 300 is configured to calculate the two-dimensional and three-dimensional contours of the object to be measured according to the positional relationship between the first line light source 210 and the second line light source 220 and the image acquisition terminal 100 .

Wherein, the first line light sources 210 are arranged along the direction of the second light source line 222, the second line light sources 220 are arranged along the direction of the first light source line 212, and the first line light sources and the second line light sources arranged in a regular arrangement can form an equidistant arrangement. Light source lines, so that the overall outline of the object to be measured can be carried out later according to the projection image formed by these light source lines.

The technical scheme of the utility model adopts two sets of mutually independent line light sources, each group of line light sources includes at least one line light source, and each line light source can control the brightness and switch independently, and can adjust the difference according to the different reflectivity of the surface of the tested object. The brightness of the line light source ensures the best test effect; by using multiple line light sources, the position of each line light source can be set independently, so that the light source surface formed by the light source projected by each line light source and the light of the image acquisition terminal 100 The axis has a certain preset angle, which avoids the situation that the light source surface and the optical axis of the image acquisition terminal 100 are parallel or coplanar caused by using a line light source.

In some embodiments, the first preset angle is between 0° and 80°, that is, the preset angle α is between 0° and 80°; similarly, the first preset angle is between 0° and 80°. , that is, the preset angle β is between 0° and 80°. The first line light source 210 and the second line light source 220 are independent of each other, and the angle between the two and the image acquisition terminal 100 can be adjusted separately without affecting each other, so the angle adjustment is more flexible and has a wider range.

In some embodiments, the optical axis of the image capture terminal 100 is in a vertical relationship with the stage 400 , and the first line light source is arranged on the left or right side of the image capture terminal 100 , and the second line light source 220 is arranged on the image capture terminal 100 . The front side or the back side of the acquisition terminal 100, so that the direction of the first light source line 212 projected by the first linear light source 210 is consistent with the horizontal direction of the screen of the image acquisition terminal 100, and the direction of the second light source line 222 projected by the second linear light source 220 It is consistent with the vertical direction of the screen of the image acquisition terminal 100 . Therefore, the first light source line 212 and the second light source line 222 are vertically intersected in the projection image collected by the image acquisition terminal 100, and are consistent with the horizontal and vertical directions of the projection image, which facilitates the rapid acquisition of the horizontal and vertical directions of the measured object. The contours in two directions, and the scanning effect is kept the same in the horizontal and vertical directions, so that the generated contour image has a small error in the horizontal and vertical directions.

In some embodiments, the first line light source 210 and the second line light source 220 may use an in-line line laser or a line array light source.

In order to further understand the present invention, the following two embodiments are used to further illustrate the specific implementation of the present invention.

As shown in FIGS. 1-2 , in the first embodiment of the present invention, the object to be measured is a square-hole workpiece 501 , and the workpiece 501 is placed in the measurement area of the object stage 400 . The image acquisition terminal 100 is a CCD camera, and the optical axis of the camera is perpendicular to the object stage 400 and passes through the center of the workpiece 501 and the center of the measurement area. The control processing terminal 300 is a computer with image processing and data calculation and analysis functions. The number of the first line light source 210 and the number of the second line light source 220 is one, and the preset angle α between the light source surface formed by the light source lines projected by the first line light source 210 and the optical axis of the camera is 30°, and the second line light source 220 projects the light source. The preset angle β between the light source surface formed by the light source lines and the optical axis of the camera is 30°. Meanwhile, the first line light source 210 is arranged above the left side of the object stage 400 , and the direction of the projected first light source line 212 is consistent with the horizontal direction of the object stage 400 ; the second line light source 220 is arranged under the object stage 400 Above the side, the direction of the projected second light source line 222 is consistent with the vertical direction of the stage 400 .

After fixing the CCD camera, the first line light source 210 and the second line light source 220 according to the above-mentioned relative positional relationship, the light source line is projected to the square hole workpiece 501. Since the square hole workpiece 501 has hole characteristics, the light source projected on the square hole workpiece 501 The line will be broken, and the projection image formed by these broken light source lines is captured by the CCD camera, and the positional relationship between the first line light source 210 and the second line light source 220 and the CCD camera and the projection image are sent to the control processing terminal 300, and the control processing terminal 300 According to the positions of the first light source line 212 and the second light source line 222, and the preset angle between the first line light source 210 and the second line light source 220 of the camera and the optical axis of the CCD camera, the square hole workpiece 501 is calculated according to the triangulation method. The heights in the horizontal and vertical directions are used to calculate the three-dimensional features of the square hole workpiece 501 .

As shown in FIGS. 3-4 , in the second embodiment of the present invention, the object to be measured is a mobile phone case 502 , and the workpiece is placed in the measurement area of the object stage 400 . The image acquisition terminal 100 is a CCD camera, and the optical axis of the camera is perpendicular to the object stage 400 and passes through the center of the mobile phone case 502 and the center of the measurement area. The control processing terminal 300 is a computer with image processing and data calculation and analysis functions. The number of the first line light sources 210 is two, the two first line light sources 210 are arranged along the direction of the second light source line 222 , and the light source surface 211 formed by the light source lines projected by each first line light source 210 and the optical axis of the camera is the same. The preset included angle α is all 30°. The number of the second line light sources 220 is three, the three first line light sources 210 are arranged along the direction of the first light source line 212 , and the light source surface 221 formed by the light source lines projected by each second line light source 220 and the camera optical axis are preset The included angle α is both 30°. After the first line light source 210 and the second line light source 220 project light source lines to the object to be measured, the CCD camera will capture the projected image and send it to the control processing terminal 300. The relative positional relationship of the two-line light sources 220 is used to calculate the three-dimensional contour of the mobile phone case 502 .

The above are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model patent. Under the concept of the utility model of the present utility model, the equivalent structure transformations made by using the contents of the present utility model description and accompanying drawings, Or directly/indirectly applied in other related technical fields are included in the scope of patent protection of the present invention.

Claims (5)

1. A profile measuring device based on a line light source, characterized in that, comprising: an object platform, on which a measurement area is arranged, and the object to be measured is placed in the center of the measurement area; at least one first line light source for projecting the first light source line to the measured object; At least one second line light source is used to project a second light source line to the measured object, and the second light source line intersects with the first light source line and the intersection formed is projected in the measurement area; The line light sources are arranged along the direction of the second light source line, and the second line light sources are arranged along the direction of the first light source line; an image acquisition terminal for acquiring the projection images projected by the first line light source and the second line light source on the measured object; the optical axis of the image acquisition terminal passes through the center position of the measurement area; and the There is a first preset angle between the first line light source and the optical axis of the image acquisition terminal, and there is a second preset angle between the second line light source and the optical axis of the image acquisition terminal; The control and processing terminal is configured to calculate the three-dimensional contour of the object to be measured according to the positional relationship between the first line light source and the second line light source and the image acquisition terminal. 2 . The profile measurement device based on a line light source according to claim 1 , wherein the first preset angle is between 0° and 80°. 3 . 3 . The profile measurement device based on a line light source according to claim 1 , wherein the second preset angle is between 0° and 80°. 4 . 4 . The profile measurement device based on a line light source according to claim 1 , wherein the first light source line projected by the first line light source is parallel to the horizontal direction of the image acquisition terminal, and the second line light source is parallel to the horizontal direction of the image acquisition terminal. 5 . The projected second light source line is parallel to the vertical direction of the image acquisition terminal. 5 . The profile measurement device based on a line light source according to claim 1 , wherein the first line light source and the second line light source are both in-line lasers or line array light sources. 6 .