KR101660481B1 - Vision Checking Method for Distinction of Front/Reverse Side in Compression Ring and the Apparatus therefor - Google Patents

Abstract

The present invention relates to a vision inspection method and apparatus for discriminating the front and back surfaces of a compression ring through a 2D image inspection using a line laser and a laser pattern inspection program. The object of the present invention is to provide a 3D laser range It is possible to distinguish very precisely without 3D image analysis using finder and high-end operating computer, and 2D image inspection using line laser and laser pattern inspection program so that error range according to field environment is not large, It improves the quality of domestic products and prevents the defect to be done beforehand by dramatically improving precision while being driven. It is the vision inspection method for identifying the front and back sides of compression ring that can contribute to domestic industrial development and domestic industrial development of expensive inspection equipment. And an apparatus .
In order to achieve the above object, the present invention provides a method of manufacturing a semiconductor device, comprising the steps of preparing a device (S10), introducing a product (S20), irradiating a line laser (S30) , A laser pattern acquiring step (S50), a laser pattern analyzing step (S60), a discriminating step (S70), and a processing step (S100). It is essential.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vision inspection method and apparatus for identifying front and rear faces of a compression ring,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vision inspection method and apparatus for discriminating front and rear faces of a compression ring through a 2D image inspection using a line laser and a laser direction confirmation program, and more particularly, It is possible to distinguish very precisely without analyzing 3D image using rangefinder and high-end operating computer, and it is possible to perform 2D image inspection using line laser and laser direction confirmation program so that error range according to field environment is not large, It improves the precision and improves the precision of the product. It prevents the defect in advance and improves the quality of the domestic product. It can make the inspection of the front and rear sides of the compression ring that can contribute to the domestic industrial development and the domestic industry. ≪ / RTI >

Compression Rings are generally two or three rings of three or four piston rings used in a piston, which are connected to the top of the piston. The two rings are reciprocating with the piston while preventing gas leakage. It scrapes and discharges the explosion heat to the cylinder.

This compression ring is required to prevent wear of the inside of the cylinder during the reciprocating motion and to prevent gas leakage and to collect engine oil. Therefore, as shown in FIG. 1, chamfering or beveling is performed on the outer circumferential surface, Should be precisely formed.

The chamfer or slope formed on the outer circumferential surface of the compression ring has a problem that the width is very narrow within 0.05 to 0.4 mm and is not visually distinguishable. When chamfers or slopes are formed on the outer circumferential surface, the inner circumferential surface has a wider slope of 0.3 to 0.9 mm And thus it is not easy to identify with the naked eye.

In this case, the slit is formed in the compression ring so that the thinner side in the radial direction is referred to as the "front side", the side in which the thickness in the radial direction is not changed is referred to as the "rear side" Marking is carried out to indicate that the front surface is to be coupled with the 'front' facing the piston head side when assembled to the piston, as shown in FIG.

2A, the piston 70 is raised while pressing the combustion chamber during compression and exhaustion. The compression ring 60 is subjected to a small friction due to a slope of a chamfer or a slope, As shown in FIG. 2B, the piston 70 is lowered by expanding the combustion chamber at the time of suction and explosion. The bottom surface of the compression ring 60 is closely attached to the inner wall of the cylinder 71 to increase the friction, It will work.

3A, when the piston 70 rises while pressing the combustion chamber during compression and exhaustion, the upper surface of the compression ring 60 is closely attached to the inner wall of the cylinder 71 Friction is increased and the inner wall is worn. As shown in FIG. 3B, when the engine is sucked or exploded, the piston 70 is lowered by expanding the combustion chamber. The compression ring 60 is lowered by a slope of the chamfer or slope and descends, And it flows into the combustion chamber.

Therefore, if the front and rear faces of the compression ring are incorrectly assembled in the opposite direction, the output of the engine is lowered and the compression ring and the inner surface of the cylinder are abraded to promote the inflow of the engine oil into the combustion chamber. As a result, Sludge is generated and the temperature of the piston is increased due to the decrease of the thermal conductivity, resulting in piston fusion, engine overheating or engine explosion.

In this way, it is very important to determine the front and rear sides of the compression ring, and it is difficult to identify the wide slope formed on the inner circumference when the naked eye is identified, so that the error range is large and the labor cost is increased.

As a vision inspection apparatus for discriminating the front and rear surfaces of conventional compression rings, 2D image inspection using LED illumination and inspection using a 3D laser range finder are representative.

The 2D image inspection apparatus 101 using the double LED illuminates the LED illumination 150 to the inspection ring 160 and the 2D image obtained from the camera 120 at the upper center, ). However, the accuracy of the inspection results is very variable according to the environment and the situation of the lighting such as brightness and vibration of the light. However, There is a problem in that the incidence rate is increased and the results are different according to the stain and foreign matter on the surface of the inspection object and the influence of the material of the product is also great so that the reliability of the front and rear inspection results of the compression ring is very low.

As shown in FIG. 5, the inspection apparatus 102 using the 3D laser rangefinder is an expensive apparatus having a cost of 30 million won or more as shown in FIG. 5, irradiating a specific laser to the inspection object, receiving the returning laser, It is possible to inspect the front and rear faces of the compression ring by imaging the surface shape of the body in a profile format and checking the step height and height of the inspection body. However, there is room for localization as an excessively expensive foreign equipment.

Korean Patent No. 10-742003 filed on May 2, 2006, entitled "Method and Apparatus for Inspection of Surface Defects" Korean Patent No. 10-382439 filed on January 25, 2000, entitled "Range finder device and camera"

SUMMARY OF THE INVENTION It is an object of the present invention to provide a 3D laser range finder capable of highly precise discrimination without 3D image analysis using an expensive 3D laser range finder and a high-grade operating computer when discriminating the front and rear faces of a compression ring through slopes And 2D image inspection using a line laser and a laser direction check program so that the error range according to the field environment is not large, the operation computer is operated very quickly in the low-end operating computer, and the precision is remarkably improved, so the work efficiency is very high and the defect is prevented in advance It is an object of the present invention to provide a vision inspection method and apparatus for improving the quality of domestic products, localization of expensive inspection equipment, and identification of the front and rear faces of compression rings, which can contribute to domestic industrial development.

In order to accomplish the above object, the present invention provides a method of controlling a laser beam projector, comprising: providing a line laser projector (10), a camera (20), an operating computer (40) and a monitor (41) (S10); (S20) of transferring the compression ring (60) of the inspection chain to a predetermined inspection position by a conveyor; A line laser irradiation step (S30) of irradiating a line laser across the compression ring in a radial direction on one side of the front and rear surfaces of the compression ring in the line laser projector (10); A laser irradiation image acquiring step (S40) of photographing the compression ring (60) irradiated with the line laser from the camera (20) installed at a predetermined angle, and obtaining the laser irradiation image and transmitting the laser irradiation image to the operation computer (40); A pattern obtaining step (S50) of obtaining a pattern of the line laser from the transmitted laser irradiation image; A laser pattern analysis step (S60) of analyzing the laser pattern obtained by the laser pattern inspection program (30); (S70) of determining the front, back, or re-inspecting of the compression ring using the information obtained from the analyzed pattern, and displaying the result on the monitor 41; And a processing step (S100) of rotating or re-inspecting the compression ring in accordance with the discriminated result, wherein the compression ring is judged as a retest when an error occurs in progress at every step. And the object of the present invention is achieved.

In the vision inspection method for discriminating the front and back sides of the compression ring, the laser pattern analysis step S60 is a step of setting the region immediately before the compression ring from the obtained laser pattern as a base region 32 A base region setting step S61; A vertical line obtaining step (S62) of obtaining a 'vertical line (33)' perpendicular to the laser pattern at the end of the pattern searched in the base area; A mask area setting step (S63) of setting a 'mask area (34)' in a laser pattern area found after the obtained vertical line; A center line acquiring step (S64) of acquiring a center line (35) by searching a laser pattern perpendicular to the vertical line (33) in the set mask area; An inspection area setting step (S65) of searching for a laser pattern deviating from the center line and setting a 'inspection area (36)'; A slant line acquiring step (S66) of acquiring a slanting line (37) having a slope in the inspection area; And a slant line measuring step (S67) of measuring the slope and the length of the obtained slant line.

In the method of inspecting the front and back sides of the compression ring, if the oblique line can not be obtained in the oblique line acquiring step (S66), it is determined that the inspection surface is 'rear side' and the process proceeds to a discrimination step (S70); In the determining step S70, it is preferable to determine 'front side' if the oblique slope and the length of the oblique line are all satisfied in the information of the obtained oblique line, and to determine 'rear side' if the oblique line length is short.

In the method of inspecting the front and back sides of the compression ring, the method further includes an LED lighting preparation step (S11) of additionally providing an LED illumination (50) at a predetermined position in the preparation step (S10); An LED illumination image analysis step S80 and an LED illumination image determination step S90 for analyzing the LED illumination image obtained by photographing the compression ring 60 irradiated with LED illumination are performed between the discrimination step S70 and the processing step S100, ); The LED illumination image analysis step S80 includes an LED illumination step S81 for applying power to the LED illumination 50 and illuminating the illumination at the compression ring 60; An LED illumination image acquisition step (S82) of photographing the compression ring (60) irradiated with the LED illumination and obtaining an LED illumination image and transmitting the LED illumination image to the operation computer (40); And a length measuring step (S83) of measuring a length in a radial direction of a surface and a side surface from the transmitted LED illumination image, wherein the LED illumination image discriminating step (S90) comprises the steps of: The result of the discrimination step S70 and the result of the LED lighting image discrimination step S80 are different from each other, It is preferable to proceed to the processing step S100 for re-inspection.

According to another aspect of the present invention, there is provided a vision inspection apparatus for identifying front and back surfaces of a compression ring, comprising: a line laser projector (10) for irradiating a line laser across a compression ring in a radial direction, Wow; A camera (20) for photographing the compression ring irradiated by the line laser at a side inclined at an angle and transmitting the laser irradiation image; A laser pattern inspection program (30) for analyzing a laser pattern from a laser irradiation image to discriminate front and rear faces of the compression ring; And an operation computer 40 installed with the laser pattern inspection program 30 and transmitting a result discriminated from the laser irradiation image received from the camera 20 to the monitor 41 and delivering a control command according to the result The present invention provides a vision inspection apparatus for identifying the front and back surfaces of a compression ring.

In the vision inspection apparatus for discriminating the front and rear sides of the compression ring, the laser pattern inspection program 30 acquires a pattern of the line laser irradiated onto the compression ring from the input laser irradiation image, analyzes the pattern, The pattern in the designated base area 32 is analyzed to obtain a perpendicular line 33 perpendicular to the pattern and the mask area 34 is set and the pattern in the set mask area 34 is analyzed to determine the center line 35, And an algorithm for determining the front and rear faces of the compression ring by measuring the slope and the length of the slash line by obtaining the slash line 37 by analyzing the pattern in the set inspection area 36 by setting the inspection area 36. [

In the vision inspection apparatus for discriminating the front and rear sides of the compression ring, it is preferable that the line laser projector 10 is installed in the direction perpendicular to the compression ring 60, which is a test piece, and irradiates the line laser in the downward direction.

The effects of the present invention are as follows.

It is possible to distinguish very precisely without 3D image analysis using expensive 3D laser range finder and high-end operating computer when determining the front and rear sides of compression ring through slope, , It is possible to improve the quality of domestic products and to make high-priced inspection equipments by localization of domestic products and development of domestic industries. Which is a very useful invention capable of providing a vision inspection method and apparatus for discriminating the front and rear sides of compression rings that can contribute.

1 is a perspective view showing a compression ring and a partial enlarged view
Fig. 2 is a schematic diagram of the state of piston movement when the compression ring is normally engaged. Fig.
Fig. 3 is a schematic diagram of the piston movement when the compression ring is reverse-
Figure 4 is a schematic diagram of 2D image inspection using conventional LED illumination
5 is a schematic view of a test using a conventional 3D laser range finder
6 is a schematic diagram of 2D image inspection using a line laser and a laser pattern inspection program of the present invention
Fig. 7 is a photograph showing a pattern of a line laser obtained from a camera and a line laser irradiated on the front side of the compression ring during the inspection according to the present invention
8 is a photograph showing a pattern of a line laser obtained from a camera and a line laser irradiated on the back surface of a compression ring during the inspection according to the present invention
FIG. 9 is a photograph showing the process of discriminating the front and back surfaces by analyzing the line laser pattern obtained from the front side of the compression ring during the inspection according to the present invention
10 is a photograph showing the process of discriminating the front and back surfaces by analyzing the line laser pattern obtained from the back surface of the compression ring during the inspection according to the present invention
11 is a photograph showing a 2D image inspection using a LED illumination on the front side of the compression ring of the present invention
FIG. 12 is a photograph showing a 2D image inspection using the LED illumination on the rear surface of the compression ring of the present invention
13 is a flowchart showing a vision inspection process to which the present invention is applied
14 is a flowchart showing a laser pattern analysis step in the inspection process of the present invention
FIG. 15 is a flowchart showing an LED illumination image analysis step in the inspection process of the present invention

Hereinafter, the present invention will be described in detail with reference to preferred embodiments. It is to be understood, however, that the embodiments are illustrative of the invention in order that the invention may be better understood, and that the terms or words used should not be construed in a conventional or dictionary sense, It should be understood that the present invention should not be construed as being limited to the meanings and concepts consistent with the technical idea of the present invention based on the principle that the concept of the term can be appropriately defined in order to explain it by a method.

The present invention can discriminate the front and rear sides of a compression ring through a slope by using an expensive 3D laser range finder and a high-grade operating computer, and can accurately discriminate without analyzing a 3D image, Through 2D image inspection using laser pattern inspection program, it is operated very quickly in low-end operating computer. It improves precision drastically, and it is highly effective in work efficiency and prevents defects beforehand, thereby improving the quality of domestic products and localizing high- Provided are a vision inspection method and apparatus for discriminating the front and rear faces of a compression ring that can contribute to domestic industrial development.

(Example 1): Vision inspection apparatus and method for discriminating front and rear faces of compression ring

As shown in FIG. 6, the vision inspection apparatus 1 for discriminating the front and back sides of the compression of the present invention includes a line laser projector 10, a camera 20, a laser pattern inspection program 30 and an operation computer 40 .

The line laser projector 10 is provided with a compression ring 60 in a radial direction on one side of the front and rear faces of the compression ring 60 as a test chain, And irradiates the line laser 11 across.

The camera 20 photographs the compression ring 60 irradiated with the line laser 11 at a side inclined at a predetermined angle and transmits the laser irradiation image to the connected operating computer 40. Here, As shown in Figure 7, it is a simple 2D image, not a 3D image. It also enables black and white images, so the image size is very small and transmission and processing speed is very fast.

The laser pattern inspection program 30 is a program having an algorithm for analyzing the laser pattern 31 from the laser irradiation image transmitted from the camera 20 and discriminating the front and rear faces of the compression ring 60, It has a simple but effective principle and its capacity is small and processing speed is very fast.

The operating computer 40 transmits the result discriminated from the image received from the camera 20 with the laser pattern inspection program 30 to the monitor 41 and controls to perform front, Command. Since the installed laser pattern inspection program 30 has a small capacity and the image obtained by the camera 20 is also a 2D image having a small capacity, the operation computer 40 can be driven sufficiently even at a low level.

Hereinafter, an inspection method using a vision inspection apparatus for identifying the front and rear surfaces of the compression ring of the present invention having the above-described structure will be described in detail with reference to the drawings.

6, the line laser projector 10, the camera 20, the operating computer 40 and the monitor 41 are installed at predetermined positions, and the laser pattern inspection program 30 installed on the operating computer 40, (S10). (Preparation step)

Next, the inspection-chain compression ring 60 is transferred to a predetermined inspection position by the conveyor (S20). (Input step)

Next, in the line laser projector 10 provided in the direction perpendicular to the inspection position, a line laser 11 crossing the compression ring 60 is radially irradiated to one side of the front and rear surfaces of the compression ring 60 (S30). (Line laser irradiation step)

Next, the camera 20 installed at a certain angle photographs the compression ring 60 irradiated with the line laser 11, and obtains the laser irradiation image, which is a 2D image, and transmits it to the operation computer 40 (S40). (Image acquisition step)

Next, the pattern 31 of the line laser is obtained from the operating computer 40 from the transmitted laser irradiation image (S50). (Pattern obtaining step)

Next, the obtained laser pattern 31 is analyzed using the laser pattern inspection program 30 (S60). (Laser pattern analysis step)

Next, the front, back, or re-inspection of the compression ring is determined using the information obtained from the analyzed pattern, and the result is displayed on the monitor 41 (S70). (Discrimination step)

In the determining step S70, the obtained information is information on the slope and the length of the oblique line, and if the oblique slope and the length of the oblique line are both satisfied, it is determined as 'front side', and if the oblique line is shorter than the length of the oblique line, .

Next, a control command for rotating or re-inspecting the compression ring is transmitted according to the determined result (S100). (Process step) If it is judged as the 'front side', the compression ring 60 is transferred to the next place as it is, and if it is judged as 'rear side', the compression ring 60 is rotated to be inverted and transferred to the next place. If this is the case, transfer it to the waiting area.

In addition, if an error occurs during the above steps, the compressed ring is determined to be 'retest'.

(Example 2): Laser pattern analysis step segmentation

Here, the laser pattern analysis step S60 may be subdivided as follows.

First, as shown in Figs. 9 to 10, the region immediately before the compression ring 60 is set as the base region 32, which is a reference for the search, from the obtained laser pattern 31 (S61). (Base area setting step)

Next, a 'vertical line 33' perpendicular to the laser pattern 31 is obtained at the end of the pattern 31 searched in the Base region (S62). (Vertical line acquisition step)

Next, a 'mask area 34' is set in the laser pattern area found after the obtained vertical line 33 (S63). (Mask area setting step)

Next, the center line 35 is obtained by searching the laser pattern perpendicular to the vertical line 33 in the set mask area (S64). (Center line acquisition step)

Next, the laser pattern that is deviated from the center line is searched to set the 'inspection area 36' (S65). (Inspection area setting step)

Next, a slanting line 37 having a slope in the inspection area is obtained (S66). If the oblique line can not be obtained in the oblique line acquiring step S66, it is determined that the inspection surface is the rear surface, and the process proceeds to the discrimination step S70.

Next, the slope and length of the oblique line are measured (S67). (Diagonal measurement step)

(Example 3): Image analysis using LED illumination and discrimination step (auxiliary secondary inspection)

First, in the preparation step S10, an LED illumination 50 is additionally installed at a predetermined position as shown in FIG. 6 (S11).

Next, an LED illumination image analysis step (S80) for analyzing the LED illumination image obtained by photographing the compression ring 60 irradiated with the LED illumination is performed between the discrimination step (S70) and the processing step (S100) (S90), which is an auxiliary secondary inspection method.

First, the LED illumination image analysis step S80 is subdivided as follows.

As shown in FIGS. 11A and 12A, power is applied to the LED illumination 50 and illumination is applied to the compression ring 60 (S81). (LED irradiation step)

Next, the compression ring 60 irradiated with the LED illumination is photographed, and the LED illumination image is obtained and transmitted to the operation computer 40 (S82). (LED illumination image acquisition step)

Next, the lengths in the radial direction of the surface and the side are measured from the transmitted LED illumination image as shown in FIGS. 11B and 12B (S83). 11b and 12b show the laser pattern, the base area, the mask area, the inspection area, the vertical line, the center line, the slant line, and the like, Helps you identify the exact location of the surface.

Next, the LED lighting image discrimination step (S90) compares the lengths of the surface and the side obtained in the length measuring step (S83) with the inputted information, and if the length is equal to the length of the surface, And if the result of the discriminating step S70 differs from the result of the LED lighting image discriminating step S90, it is judged as 'retesting' The process proceeds to the processing step S100 for re-inspection. (LED lighting image discrimination step)

The image analysis (S80) and the discrimination step (S90) using the LED illumination are optional as an auxiliary secondary inspection of a vision inspection method using a line laser and a laser pattern inspection program.

In practice, the vision inspection method and apparatus using a line laser and a laser pattern inspection program are highly accurate so that there is no falsehood after stabilization, so that an image inspection method using an LED illumination as an auxiliary secondary inspection is unnecessary. However, As the method can be tested together.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
1: Vision inspection apparatus of the present invention 10: Line laser projector
11: line laser 20: camera
30: laser pattern inspection program 31: laser pattern
32: Base area 33: Vertical line
34: Mask area 35: Center line
36: inspection area 37: oblique line
40: computer 41: monitor
50: LED lighting 60: compression ring
61: front 62: rear
63: outer slope surface 64: inner slope surface
70: Piston 71: Cylinder
72: Oiling
S10: preparation step S11: LED lighting preparation step
S20: product input step S30: line laser irradiation step
S40: Image acquisition step S50: Pattern acquisition step
S60: Laser pattern analysis step S61: Base area setting step
S62: Vertical line acquisition step S63: Mask area setting step
S64: center line acquisition step S65: inspection area setting step
S66: Oblique line acquisition step S67: Oblique line measurement step
S70: Identification step S80: LED illumination image analysis step
S81: LED illumination step S82: LED illumination image acquisition step
S83: Length measurement step S90: LED illumination image determination step
S100: Processing step

Claims (7)

delete A preparation step S10 of installing the line laser projector 10, the camera 20, the operating computer 40 and the monitor 41 at predetermined positions and driving the laser pattern inspection program 30;
(S20) of transferring the compression ring (60) of the inspection chain to a predetermined inspection position by a conveyor;
A line laser irradiation step (S30) of irradiating a line laser across the compression ring in a radial direction on one side of the front and rear surfaces of the compression ring in the line laser projector (10);
A laser irradiation image acquiring step (S40) of photographing the compression ring (60) irradiated with the line laser from the camera (20) installed at a predetermined angle, and obtaining the laser irradiation image and transmitting the laser irradiation image to the operation computer (40);
A pattern obtaining step (S50) of obtaining a pattern of the line laser from the transmitted laser irradiation image;
A laser pattern analysis step (S60) of analyzing the laser pattern obtained by the laser pattern inspection program (30);
(S70) of determining the front, back, or re-inspecting of the compression ring using the information obtained from the analyzed pattern, and displaying the result on the monitor 41;
And a processing step (S100) of rotating or re-inspecting the compression ring as it is according to the discriminated result,
If an error occurs in progress at every step, the compression ring is determined to be retested;
The laser pattern analysis step (S60)
A base region setting step (S61) of setting a region immediately before the compression ring from the obtained laser pattern as a base region (32) serving as a search reference;
A vertical line obtaining step (S62) of obtaining a 'vertical line (33)' perpendicular to the laser pattern at the end of the pattern searched in the base area;
A mask area setting step (S63) of setting a 'mask area (34)' in a laser pattern area found after the obtained vertical line;
A center line acquiring step (S64) of acquiring a center line (35) by searching a laser pattern perpendicular to the vertical line (33) in the set mask area;
An inspection area setting step (S65) of searching for a laser pattern deviating from the center line and setting a 'inspection area (36)';
A slant line acquiring step (S66) of acquiring a slanting line (37) having a slope in the inspection area;
And a diagonal line measuring step (S67) of measuring the inclination and length of the obtained oblique line. 3. The method of claim 2,
If the oblique line can not be obtained in the oblique line acquiring step (S66), it is determined that the inspection surface is 'rear side', and the process proceeds to a discrimination step (S70);
If it is determined that the slope and the length of the oblique line are all satisfied in the information of the obtained oblique line in the discriminating step (S70), it is determined as 'front side', and if the oblique line length is less than the oblique line length, Vision inspection method for discrimination. The method of claim 3,
And an LED illumination preparation step (S11) for additionally providing an LED illumination (50) at a predetermined position in the preparation step (S10);
An LED illumination image analysis step S80 and an LED illumination image determination step S90 for analyzing the LED illumination image obtained by photographing the compression ring 60 irradiated with LED illumination are performed between the discrimination step S70 and the processing step S100, );
The LED illumination image analysis step (S80)
An LED illumination step (S81) for applying power to the LED illumination (50) and illuminating the compression ring (60);
An LED illumination image acquisition step (S82) of photographing the compression ring (60) irradiated with the LED illumination and obtaining an LED illumination image and transmitting the LED illumination image to the operation computer (40);
And a length measuring step (S83) of measuring a length in the radial direction of the surface and the side from the transmitted LED illumination image,
The LED lighting image discrimination step (S90) is a step of discriminating the front and rear faces of the compression ring by comparing the lengths of the surface and the side obtained in the length measuring step (S83) with the inputted information and displaying the result on the monitor 41, Wherein when the result of the discriminating step S70 is different from the result of the LED lighting image discriminating step S80, the process goes to the step S100 for the re-inspection. delete A vision inspection apparatus for identifying the front and rear faces of a compression ring,
A line laser projector (10) for irradiating a line laser across the compression ring in a radial direction on one side of the front and rear surfaces of the inspection chain compression ring;
A camera (20) for photographing the compression ring irradiated by the line laser at a side inclined at an angle and transmitting the laser irradiation image;
A laser pattern inspection program (30) for analyzing a laser pattern from a laser irradiation image to discriminate front and rear faces of the compression ring;
And an operation computer 40 installed with the laser pattern inspection program 30 and transmitting a result discriminated from the laser irradiation image received from the camera 20 to the monitor 41 and delivering a control command according to the result ≪ / RTI >
The laser pattern inspection program (30)
A pattern of the line laser irradiated onto the compression ring is obtained from the input laser irradiation image, and the pattern is analyzed to designate the base area 32. The pattern in the designated base area 32 is analyzed and a vertical line 33 orthogonal to the pattern is obtained The mask area 34 is set and the pattern in the set mask area 34 is analyzed to obtain the center line 35 and the inspection area 36 is set and the pattern in the set inspection area 36 is analyzed, And an algorithm for determining the front and rear sides of the compression ring by measuring the slope and length of the slope line. The method according to claim 6,
Characterized in that the line laser projector (10) is installed in a direction perpendicular to the compression ring (60) as an inspection and irradiates a line laser in a direct downward direction.

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