Bottle body outer surface three-dimensional modeling method, detection method and detection device

Abstract

The invention discloses a bottle body outer surface three-dimensional modeling method, a detection method and a detection device in the technical field of non-contact optical detection. The three-dimensional modeling method for the outer surface of the bottle body comprises the following steps that A, a parallel light source is used for lighting the side face of the bottle body, reflected light enters a large-dynamic-range phase measuring device, and an output result of the large-dynamic-range phase measuring device is processed by an upper computer so that three-dimensional modeling of the outer surface of the bottle body in the view field range can be obtained; and B, rotating the bottle body and repeating the steps so as to carry out three-dimensional modeling on the outer surface of the whole bottle body. After the parallel light beams are reflected by the surface of the glass bottle, the phase of reflected light carries three-dimensional depth information of the bottle body, the three-dimensional depth of the bottle body can be obtained by detecting the phase of the reflected light through a large-dynamic-range wavefront detection device, and the detection accuracy of defects of the glass bottle can be hopefully improved.

Description

Technical Field

[0001] The present invention relates to the technical field of non-contact optical detection, and in particular to a three-dimensional modeling method, a detection method and a detection device for the outer surface of a bottle. Background Art

[0002] In the wine industry, one of the important symbols of brand image is the appearance of the glass bottle. The external dimensions and surface defects of the glass bottle have a significant impact on the appearance of the glass bottle, so it is of great significance to detect the external dimensions and surface defects of the glass bottle. At present, in the wine industry, related inspections mainly rely on manual work. In particular, the external dimensions of the glass bottle are often inspected with a variety of decorative patterns and irregular shapes, so it is difficult to achieve effective measurement with conventional tools such as vernier calipers and micrometers. Although there are automated inspection methods based on image processing, the decorative patterns and textures on the surface of the glass bottle are prone to lighting shadows and other problems, which can easily lead to false detection of defects. Summary of the invention

[0003] In order to overcome the problem of false defect detection caused by decorative patterns on the surface of existing glass bottles, the present invention provides a three-dimensional modeling method, a detection method and a detection device for the outer surface of a bottle.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] The three-dimensional modeling method of the outer surface of the bottle includes the following steps:

[0006] A. Use a parallel light source to illuminate the side of the bottle body so that the reflected light enters a large dynamic range phase measurement device. The output result of the large dynamic range phase measurement device is processed by a host computer to obtain a three-dimensional model of the outer surface of the bottle body within the field of view;

[0007] B. Rotate the bottle and repeat the above steps to perform 3D modeling on the entire outer surface of the bottle.

[0008] The principle of this patent is that after a parallel light beam is reflected from the surface of a glass bottle, the phase of the reflected light will carry the three-dimensional depth information of the bottle body. The three-dimensional depth of the bottle body can be obtained by detecting the phase of the reflected light through a large dynamic range wavefront detection device.

[0009] In this application, the outer surface of the glass bottle is modeled and detected based on phase detection, which is expected to improve the detection accuracy of glass bottle defects.

[0010] In some embodiments, before step A, a parallel light source is used to perform an offline calibration on the large dynamic range phase measurement device.

[0011] The present invention also provides a method for detecting the outer surface of a bottle body, which uses the three-dimensional modeling method for the outer surface of a bottle body in any of the above embodiments for detection.

[0012] In some embodiments, the steps include:

[0013] S1. First, a standard glass bottle is obtained by three-dimensional modeling of the outer surface of the bottle using the three-dimensional modeling method of the standard glass bottle;

[0014] S2. Then obtain a three-dimensional model of the glass bottle to be tested by the three-dimensional modeling method of the outer surface of the bottle;

[0015] S3. Compare the 3D modeling differences between the glass bottle to be tested and the standard glass bottle, so as to inspect the outer surface of the bottle.

[0016] The present invention also provides a device for the bottle outer surface detection method described in any of the above embodiments, comprising a parallel light source, a workbench, a large dynamic range phase measurement device and a host computer, wherein the large dynamic range phase measurement device and the host computer are signal-connected, and an optical axis of the parallel light source and an optical axis of the large dynamic range phase measurement device form an acute angle, so that when the parallel light source illuminates the bottle on the workbench, the reflected light can enter the large dynamic range phase measurement device.

[0017] In some embodiments, the workbench is a spin table.

[0018] In some embodiments, the angle between the optical axis of the parallel light source and the optical axis of the large dynamic range phase measurement device is 22.5°±2.5°.

[0019] In some embodiments, the large dynamic range phase measurement device is a Hartmann wavefront sensor.

[0020] In some embodiments, the parallel light source is a laser parallel light source.

[0021] Furthermore, the central wavelength of the laser parallel light source is 635nm, and the output beam line width is within ±10nm.

[0022] The beneficial effects of the present invention are:

[0023] After the parallel light beam is reflected by the surface of the glass bottle, the phase of the reflected light will carry the three-dimensional depth information of the bottle body. By detecting the phase of the reflected light through a large dynamic range wavefront detection device, the three-dimensional depth of the bottle body can be obtained, which is expected to improve the detection accuracy of glass bottle defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the process of the three-dimensional modeling method of the outer surface of a bottle provided by the present invention;

[0025] Figure 2 A schematic diagram of the process of offline calibration in the three-dimensional modeling method of the outer surface of the bottle provided by the present invention;

[0026] Figure 3 This is a schematic structural diagram of a bottle outer surface detection device provided by the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings.

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Embodiment 1

[0030] Combination Figure 1 and Figure 2 As shown, the present invention provides a three-dimensional modeling method for the outer surface of a bottle.

[0031] The three-dimensional modeling method of the outer surface of the bottle body at least comprises the following steps:

[0032] A. Use a parallel light source to illuminate the side of the bottle body so that the reflected light enters a large dynamic range phase measurement device. The output result of the large dynamic range phase measurement device is processed by a host computer to obtain a three-dimensional model of the outer surface of the bottle body within the field of view;

[0033] Specifically, the host computer obtains a three-dimensional model of the outer surface of the bottle within the field of view by restoring the phase measurement result.

[0034] B. Rotate the bottle and repeat the above steps to perform 3D modeling on the entire outer surface of the bottle.

[0035] Specifically, the bottle body is rotated and step A is repeated until the three-dimensional modeling of the entire outer surface of the bottle body is completed.

[0036] The principle of this patent is that after a parallel light beam is reflected from the surface of a glass bottle, the phase of the reflected light will carry the three-dimensional depth information of the bottle body. The three-dimensional depth of the bottle body can be obtained by detecting the phase of the reflected light through a large dynamic range wavefront detection device.

[0037] In step B, preferably, the bottle body can be rotated until the portion of the bottle body observed in the previous step A just leaves the field of view, thereby simplifying the modeling process.

[0038] In this application, the outer surface of the glass bottle is modeled and detected based on phase detection, which is expected to improve the detection accuracy of glass bottle defects.

[0039] It is worth mentioning that large dynamic range phase measurement equipment is a common technical term in this field and has a clear meaning in the field of phase sensing and measurement technology. Figure 1 Wavefront measurement equipment and Figure 2The large dynamic range wavefront measurement device in the above refers to the large dynamic range phase measurement device here. The optional large dynamic range phase measurement device includes Hartmann wavefront sensor, interferometer, etc.

[0040] In this embodiment, before step A, a parallel light source is used to perform offline calibration on the large dynamic range phase measurement device. The detection accuracy is further improved through offline calibration.

[0041] Embodiment 2

[0042] Based on the above three-dimensional modeling method for the outer surface of a bottle, the present invention further provides a method for detecting the outer surface of a bottle, which uses the three-dimensional modeling method for the outer surface of a bottle in the above embodiment for detection.

[0043] The specific steps include:

[0044] S1. First, a standard glass bottle is obtained by three-dimensional modeling of the outer surface of the bottle using the three-dimensional modeling method of the standard glass bottle;

[0045] S2. Then obtain a three-dimensional model of the glass bottle to be tested by the three-dimensional modeling method of the outer surface of the bottle;

[0046] S3. Compare the 3D modeling differences between the glass bottle to be tested and the standard glass bottle, so as to inspect the outer surface of the bottle.

[0047] Specifically, the bottle outer surface detection method can be used to detect three-dimensional surface defects, such as spots and scratches.

[0048] Embodiment 3

[0049] like Figure 3 As shown, the present invention also provides a device for the bottle body outer surface detection method described in the above embodiment, comprising a parallel light source, a workbench, a large dynamic range phase measurement device and a host computer, wherein the large dynamic range phase measurement device is signal-connected to the host computer, and an optical axis of the parallel light source forms an acute angle with an optical axis of the large dynamic range phase measurement device, so that when the parallel light source illuminates the bottle body on the workbench, the reflected light can enter the large dynamic range phase measurement device.

[0050] In this embodiment, the workbench is a spinning workbench.

[0051] Setting up the workbench as above facilitates the rotation of the bottle body, improves the degree of automation, and is conducive to further improving the detection accuracy and detection efficiency.

[0052] In this embodiment, the angle between the optical axis of the parallel light source and the optical axis of the large dynamic range phase measurement device is 22.5°±2.5°.

[0053] The angle is set as above to take into account both the field of view and the convenience of design.

[0054] In this embodiment, the large dynamic range phase measurement device is a Hartmann wavefront sensor, which is easy to operate and has low environmental requirements.

[0055] In this embodiment, the parallel light source is a laser parallel light source.

[0056] Furthermore, the central wavelength of the laser parallel light source is 635nm, and the output beam line width is within ±10nm.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-dimensional modeling method for the outer surface of a bottle, characterized in that: The following steps are involved: A. Use a parallel light source to illuminate the side of the bottle body so that the reflected light enters a large dynamic range phase measurement device. The output result of the large dynamic range phase measurement device is processed by a host computer to obtain a three-dimensional model of the outer surface of the bottle body within the field of view; B. Rotate the bottle and repeat the above steps to perform 3D modeling on the entire outer surface of the bottle.

2. The three-dimensional modeling method for the outer surface of a bottle as claimed in claim 1, characterized in that: Before step A, the large dynamic range phase measurement device is first calibrated offline using a parallel light source.

3. Bottle outer surface detection method, characterized in that: The detection is performed using the three-dimensional modeling method for the outer surface of the bottle body as described in any one of claims 1-2.

4. The bottle outer surface detection method according to claim 3, characterized in that: The following steps are involved: S1. First, a standard glass bottle is obtained by three-dimensional modeling of the outer surface of the bottle using the three-dimensional modeling method of the standard glass bottle; S2. Then obtain a three-dimensional model of the glass bottle to be tested by the three-dimensional modeling method of the outer surface of the bottle; S3. Compare the 3D modeling differences between the glass bottle to be tested and the standard glass bottle, so as to inspect the outer surface of the bottle.

5. A device for the bottle outer surface detection method according to any one of claims 3 to 4, characterized in that: The invention comprises a parallel light source, a workbench, a large dynamic range phase measurement device and a host computer. The large dynamic range phase measurement device is connected to the host computer by signal. An optical axis of the parallel light source forms an acute angle with an optical axis of the large dynamic range phase measurement device, so that when the parallel light source illuminates the bottle body on the workbench, the reflected light can enter the large dynamic range phase measurement device.

6. The device for detecting the outer surface of a bottle as claimed in claim 5, characterized in that: The workbench is a spinning workbench.

7. The device for detecting the outer surface of a bottle as claimed in claim 5, characterized in that: The angle between the optical axis of the parallel light source and the optical axis of the large dynamic range phase measurement device is 22.5°±2.5°.

8. The device for detecting the outer surface of a bottle as claimed in claim 5, characterized in that: The large dynamic range phase measurement device is a Hartmann wavefront sensor.

9. The device for detecting the outer surface of a bottle according to any one of claims 5 to 8, characterized in that: The parallel light source is a laser parallel light source.

10. The device for detecting the outer surface of a bottle as claimed in claim 9, characterized in that: The central wavelength of the laser parallel light source is 635nm, and the output beam line width is within ±10nm.

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