CN210487642U - Glass optical distortion detection system - Google Patents
Glass optical distortion detection system Download PDFInfo
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- CN210487642U CN210487642U CN201921235920.6U CN201921235920U CN210487642U CN 210487642 U CN210487642 U CN 210487642U CN 201921235920 U CN201921235920 U CN 201921235920U CN 210487642 U CN210487642 U CN 210487642U
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- 239000011521 glass Substances 0.000 title claims abstract description 131
- 238000001514 detection method Methods 0.000 title claims abstract description 102
- 230000003287 optical effect Effects 0.000 title claims abstract description 67
- 238000007689 inspection Methods 0.000 claims description 12
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000005304 optical glass Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
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Abstract
The application discloses a glass optical distortion detection system, which comprises a pattern display device and an image acquisition device, wherein the pattern display device is provided with a display plane and is used for displaying patterns for detection; the image acquisition device is arranged at a certain distance from the pattern display device and comprises a camera which is used for acquiring the image of the detection pattern displayed on the display plane through the glass plate to be detected. The image capture device may include a camera array comprised of a plurality of cameras. The glass optical distortion detection system is beneficial to simplifying the optical distortion detection operation of the glass plate and is beneficial to improving the detection efficiency and the detection accuracy.
Description
Technical Field
The present application relates to the detection of optical properties of glass, and more particularly to optical distortion detection systems for glass sheets.
Background
Glass sheets are materials commonly used in daily life and industrial production, and are used in many occasions requiring perspective observation due to their good light transmittance, for example, as front and rear windshields of vehicles. In order to provide a good visual experience and to ensure safety in driving a vehicle as well as to serve as front and rear windshields of the vehicle, demands have been made on such glass plates in terms of optical performance. For this reason, manufacturers of glass sheets have examined glass for light transmittance, light distortion, and the like.
Glass optical distortion detection is typically performed using a projection system in which an array pattern for detection is projected through a glass sheet to be measured onto a curtain using a slide projector, and the optical distortion of the glass sheet is evaluated by measuring the distortion of the pattern on the curtain.
However, in this detection method, the deformation of the pattern on the curtain needs to be observed by human eyes, which not only takes time and labor, but also has low accuracy of the detection result and unstable quality. Even if a camera is used in combination with this detection method instead of the human eye to capture an image of the pattern projected onto the screen, the optical distortion of the glass sheet cannot be accurately detected because the camera cannot be arranged perpendicular to the screen in the apparatus system of this detection method.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned not enough that exists among the prior art, the utility model provides a glass light distortion detecting system, wherein adopt imaging system to carry out the light distortion detection of glass board.
According to an embodiment of the present invention, there is provided a glass optical distortion detection system, which includes a pattern display device and an image acquisition device, wherein the pattern display device has a display plane for displaying a pattern for detection; the image acquisition device is arranged at a certain distance from the pattern display device and comprises a camera, and the optical axis of the camera is perpendicular to the display plane of the pattern display device and is used for acquiring the image of the detection pattern displayed on the display plane through a glass plate to be detected placed between the pattern display device and the image acquisition device.
Preferably, the glass optical distortion detection system may further comprise an image processing and computing system including a processor and a memory for receiving an image of the pattern for detection, and performing image processing and computation on the image to obtain an optical distortion index of the glass sheet.
In some embodiments, the detection pattern is a dot array pattern, and the image processing and computing system identifies an ellipse corresponding to dots in the dot array pattern in the image of the detection pattern, and identifies major and minor axes of the ellipse to obtain an indication of optical distortion of the glass sheet under test.
The dot array pattern of the detection pattern may be a black-matrix white dot pattern or a white-matrix black dot pattern.
Optionally, the glass optical distortion detection system may further comprise a glass plate holder for holding a glass plate to be measured.
In some preferred embodiments, the pattern display device is a lamp box device including a front panel formed as the display plane and having a light-transmitting area and a light-non-transmitting area formed thereon, and a light source for irradiating the front panel.
In some preferred embodiments, the image capturing device may include a camera array of a plurality of cameras, each of the plurality of cameras being configured to capture a sub-image of a respective local area of the inspection pattern displayed by the display panel through the glass sheet under test.
Preferably, the glass optical distortion detection system further comprises a glass plate support for holding a glass plate to be detected, wherein the position of the glass plate support in the horizontal and vertical directions is fixed relative to the pattern display device and the image acquisition device during the detection of the glass to be detected; and the glass plate support is provided with a pitching adjusting device and a horizontal swinging device which are mutually independent, the pitching adjusting device is used for adjusting the glass plate to be detected to enable the glass plate to be supported on the glass plate support at a pitching angle in a working state, and the horizontal swinging device is used for enabling the glass plate to be detected to rotate in the horizontal direction so as to detect different parts of the glass plate to be detected.
In some embodiments, the image acquisition device comprises a camera array composed of a plurality of cameras, each of the plurality of cameras is used for acquiring a sub-image of a corresponding local area of the pattern for detection displayed on the display plane through the glass plate to be detected; and the image processing and computing system stitches together the sub-images acquired by the plurality of cameras. In this case, it is preferable that the detection pattern includes a pattern for marking a boundary of each of the local regions.
According to the utility model discloses glass light distortion detecting system is favorable to the simplified operation to be favorable to improving the efficiency and the rate of accuracy that detect
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Other features, objects, and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings in which like reference characters designate the same or corresponding parts and features.
FIG. 1 is a schematic diagram of a glass optical distortion detection system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a light box for use as a pattern display device in the system of FIG. 1;
fig. 3a, 3b, and 3c show different examples of the pattern for detection, respectively;
FIGS. 4a, 4b schematically illustrate one example of a glass sheet holder that may be used in the system of FIG. 1, wherein FIG. 4a shows the glass sheet holder empty and FIG. 4b shows the glass sheet holder holding a glass sheet to be measured;
fig. 5 is a schematic block diagram of a glass optical distortion detection system according to an embodiment of the present invention;
fig. 6 is a schematic view of a glass optical distortion detection system according to other embodiments of the present invention, wherein the image capture device includes a camera array of multiple cameras; and
fig. 7 is a schematic block diagram of a glass optical distortion detection method according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Fig. 1 is a schematic diagram of a glass optical distortion detection system according to an embodiment of the present invention. As shown in fig. 1, the glass optical distortion detection system includes a pattern display device 10 and an image pickup device 20. The pattern display device 10 has a display plane 10a for displaying a pattern for detection. The image pickup device 20 is disposed at a distance from the pattern display device 10. In the example of the inspection system shown in fig. 1, the image pickup device 20 includes a camera disposed such that its optical axis is perpendicular to the display plane 10a of the pattern display device 10, thereby minimizing the detection result of optical distortion of the glass sheet due to optical distortion interference introduced by the imaging system of the camera itself. During the inspection, the glass sheet G to be inspected is placed between the pattern display device 10 and the image pickup device 20, and the camera of the image pickup device 20 picks up an image of the inspection pattern displayed on the display plane 10a through the glass sheet G to be inspected.
In some embodiments, as shown in fig. 1, the glass optical distortion detection system may further include an image processing and computing system 30. The image processing and computing system 30 includes a processor 31 and a memory 32 (see fig. 5), which are connected to the image capturing device 20 in a wired or wireless manner, and are used for receiving the image captured by the image capturing device 20, processing and computing the image to obtain an optical distortion index of the glass plate to be measured. The image processing and computing system 30 may be implemented using a special purpose or general purpose computer device, and the invention is not limited in this respect. Compare and observe and the recognition mode in traditional people's eye, according to the utility model discloses the glass light distortion detecting system of these embodiments has simplified detection operation greatly through the light distortion with digital means collection and processing image and calculation/aassessment glass board to detection efficiency and rate of accuracy have been improved.
Of course, it should be understood that a glass optical distortion detection system in accordance with embodiments of the present invention is not limited to necessarily including image processing and computing system 30. In other embodiments, the images captured by image capture device 20 through glass sheet G under test may be stored, printed, or otherwise displayed for subsequent manual viewing and evaluation. In such an embodiment, compared with the method of observing the detection pattern projected on the curtain by directly using human eyes to penetrate through the glass plate to be detected, the method can separate the image acquisition and the image observation in space and time, so that the arrangement of the optical distortion detection work of the glass plate is more flexible, the detection efficiency is improved, the influence of the state of workers on the detection quality is reduced, and the detection accuracy is improved.
Next, a pattern display device 10 suitable for a glass optical distortion detection system according to an embodiment of the present invention will be described with reference to fig. 2 and fig. 3a to 3 c.
Fig. 2 shows one light box device that may be used as the pattern display device 10. Specifically, the lamp box is configured to have a front panel 11 and a light source 12 for illuminating the front panel 11 empty. The front panel 11 forms a display plane 10a of the pattern display apparatus 10. In some preferred embodiments, the front panel 11 has transparent regions and opaque regions, which form a detection pattern with strong contrast between light and dark when the light source 12 irradiates the front panel 11. The light source 12 may be an incandescent lamp, a fluorescent lamp, an LED, or the like.
Fig. 3a, 3b, and 3c show different examples of the detection pattern. According to the embodiment of the present invention, the pattern for detection may be a dot array pattern, such as a black-matrix white dot pattern P1 shown in fig. 3a, and a white-matrix black dot pattern P2 shown in fig. 3 b. The detection pattern may also be another pattern, such as a grid pattern P3 as shown in fig. 3 c.
When the pattern for detection displayed by the pattern display device 10 penetrates through the glass sheet G to be detected, the optical distortion of the glass sheet may cause the propagation direction of the optical fiber to change, so that in the image finally acquired by the image acquisition device 20, the features in the pattern to be detected are deformed, for example, the dots may become oval, and for example, the straight lines may become curved lines, and so on. The image processing and calculation system 30 uses the features identifying these variations and calculates to obtain an index of optical distortion of the glass sheet.
In some preferred examples of the glass optical distortion detection system, the detection pattern is a dot array pattern, and the image processing and computing system 30 identifies an elliptical figure corresponding to dots in the dot array pattern in the image of the detection pattern acquired by the image acquisition device 20, and identifies major and minor axes of the elliptical figure, thereby obtaining an optical distortion index of the glass plate to be measured.
However, the present invention is not limited to the use of a specific detection pattern or to the use of a specific processing and calculation method by the image processing and calculation system. For example, in other examples, the image processing and computing system may compare an image of the inspection pattern captured through the glass sheet to be inspected with a pre-stored reference image to obtain an optical distortion indicator for the glass sheet to be inspected, wherein the reference image is an image of the inspection pattern on the display plane captured without the glass sheet being positioned between the pattern display device and the image capture device.
In the optical distortion detection process, the glass sheet G to be detected is preferably disposed between the pattern display device 10 and the image capture device 20 at its working angle α. for glass sheets for different applications, the working angle may be different. for example, for front windshields for different vehicles, the working angle is typically between 50 ° and 80 ° with respect to the horizontal.
Fig. 4a shows a preferred example of a glass panel support 40, wherein the glass panel support 40 is provided with a pitch adjustment device 41 and a roll device 42, which are independent of each other. The pitch adjusting device 41 includes, for example, a U-shaped support frame pivotally mounted for adjusting the pitch angle of the glass sheet G to be measured so as to be supported on the glass sheet support frame at the pitch angle in the operating state. The horizontal swinging means 42 includes, for example, a threaded shaft connecting structure for swinging the glass sheet G to be measured in the horizontal direction so as to detect different portions of the glass sheet G to be measured. FIG. 4b shows a state in which the glass plate G to be measured is held on the glass plate holder 40 shown in FIG. 4 a. It should be understood that the present invention is not limited to the specific configuration of the pitch adjustment device 41 and the yaw device 42.
Fig. 5 illustrates in block diagram form a glass optical distortion detection system 1 in accordance with a preferred embodiment of the present invention, the detection system 1 including both a pattern display device 10 and an image capture device 20, as well as an integrated image processing and computing system 30 and a glass sheet support 40. The specific implementation of the above devices and systems included in the detection system 1 can refer to the description above with reference to fig. 1 to 4, and are not described herein again.
Various other embodiments of the present invention for detecting optical distortion in glass will now be described with reference to fig. 6. The glass optical distortion detection system shown in fig. 6 is substantially the same as the detection system shown in fig. 1, except that the image capture device 20' in the detection system shown in fig. 6 includes a camera array of a plurality of cameras. Preferably, the plurality of cameras have optical axes parallel to each other. Preferably, each of the plurality of cameras is adapted to acquire a sub-image of a corresponding partial area of the pattern for inspection displayed on the display plane 10a through the glass sheet G to be inspected.
In this case, the image processing and computing system 30 may stitch together the sub-images acquired by the multiple cameras in processing. Accordingly, although not shown in the drawings, in some examples, the detection pattern may include a figure for marking a boundary of the local area corresponding to each camera, for example, a boundary line.
In the present embodiment, since the image capture device 20' employs a camera array of multiple cameras, each camera being used to image only a portion of the pattern for detection, the individual cameras may have lower resolution relative to the cameras in the embodiment shown in fig. 1, with the same detection accuracy requirements. Thus, the range of applicable cameras is wider, and it is possible to reduce the device cost. In another view, in the case of using the same resolution camera, the detection system of the embodiment shown in fig. 6 is intended to read the detection system of the embodiment shown in fig. 1, and thus higher detection accuracy can be achieved.
Meanwhile, in the image pickup apparatus 20' according to the present embodiment, since the plurality of cameras in the camera array are used to image the parts of the pattern for detection, respectively, each camera can image only a portion near its optical axis; moreover, since the imaging system of the camera itself also introduces optical distortion, which is particularly true for imaging objects that are further off-axis, the image capture device 20' including the camera array is further advantageous in suppressing optical distortion introduced by the imaging system of the camera itself, thereby facilitating an increase in the glass sheet optical distortion detection accuracy.
Furthermore, a glass plate holder 40 is preferably included in the optical distortion detection system of fig. 6, and the glass plate holder 40 may be the glass plate holder as described above in connection with fig. 4a and 4 b. It is to be noted that, in the present embodiment, since the image pickup device 20' employs the camera array, the glass plate holder 40 is allowed to be fixed in the horizontal and vertical directions with respect to the pattern display device 10 and the image pickup device 20 during the inspection, and the inspection of the entire area to be inspected of the glass plate G to be inspected is realized only by the pitch angle adjustment and the horizontal swing of the glass plate G to be inspected on the glass plate holder 40. Of course, the present embodiment is not limited to implementations in which the glass panel holder 40 is positionally fixed during the inspection process.
Next, a method for detecting optical distortion of glass according to an embodiment of the present invention will be described with reference to fig. 7, and fig. 7 is a flow chart of the method.
As shown in fig. 7, a glass optical distortion detection method 2 according to an embodiment of the present invention includes the following processes:
s10, providing a pattern display device and an image acquisition device, wherein the pattern display device is provided with a display plane for displaying the pattern for detection, the image acquisition device is arranged at a certain distance from the pattern display device and comprises a camera, and the optical axis of the camera is vertical to the display plane of the pattern display device;
s20, placing the glass plate to be measured between the pattern display device and the image acquisition device at a preset angle; and
and S30, acquiring the image of the detection pattern displayed on the display plane through the glass plate to be detected by using the camera of the image acquisition device.
Optionally, the glass optical distortion detection method 2 may further include:
and S40, performing image processing and calculation on the image of the pattern for detection by using an image processing and calculating system comprising a processor and a memory to obtain an optical distortion index of the glass plate to be detected.
In some embodiments in which the detection pattern is a dot array pattern, the "performing image processing and calculation" described in the above processing S40 may include: and identifying an elliptical figure corresponding to the dots in the dot array pattern in the image of the detection pattern, and identifying the major axis and the minor axis of the elliptical figure, thereby obtaining the optical distortion index of the glass plate to be detected.
In some other embodiments, the "performing image processing and calculation" in the above processing S40 may include: and comparing the image of the detection pattern acquired by penetrating through the glass plate to be detected with a prestored reference image to acquire the optical distortion index of the glass plate to be detected, wherein the reference image is the image of the detection pattern on the display plane acquired by using a camera of the image acquisition device under the condition that the glass plate is not arranged between the pattern display device and the image acquisition device.
In some embodiments, where the image capture device includes a camera array formed by a plurality of cameras, the process S30 may include: sub-images of corresponding partial areas of the pattern for detection are acquired with each of the plurality of cameras, respectively. In this case, as discussed above in connection with the glass optical distortion detection system according to an embodiment of the present invention, the above-described process S40 may include a process of stitching together sub-images acquired by a plurality of cameras.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A glass optical distortion detection system, comprising:
a pattern display device having a display plane for displaying a pattern for detection; and
the image acquisition device is arranged at a certain distance from the pattern display device and comprises a camera, and the optical axis of the camera is perpendicular to the display plane of the pattern display device and used for acquiring the image of the detection pattern displayed on the display plane through a glass plate to be detected placed between the pattern display device and the image acquisition device.
2. The glass optical distortion detection system of claim 1, further comprising an image processing and computing system including a processor and a memory for receiving an image of said detection pattern, and performing image processing and computing on the image to obtain an optical distortion index for the glass sheet under test.
3. The glass optical distortion detection system of claim 2, wherein the detection pattern is a dot array pattern, and the image processing and computing system identifies an elliptical pattern corresponding to dots in the dot array pattern in the image of the detection pattern, and identifies major and minor axes of the elliptical pattern, thereby obtaining an optical distortion index of the glass sheet under test.
4. The optical glass distortion detection system according to claim 3, wherein the dot array pattern of the detection pattern is a black-matrix white dot pattern or a white-matrix black dot pattern.
5. The glass optical distortion detection system of any of claims 1-4, further comprising a glass sheet holder for holding a glass sheet to be tested.
6. The glass optical distortion detection system of any one of claims 1 to 4, wherein said pattern display device is a lamp box device including a front panel formed as said display plane and a light source for irradiating the front panel, said front panel having a light-transmitting area and a light-non-transmitting area formed thereon.
7. A glass optical distortion detection system as claimed in any of claims 1 to 4 wherein said image capture means comprises a camera array of a plurality of cameras, each of said plurality of cameras being adapted to capture a sub-image of a respective local area of said display panel displayed inspection pattern through the glass sheet to be inspected.
8. The glass optical distortion detection system of claim 7, further comprising a glass sheet holder for holding a glass sheet to be tested, wherein the position of the glass sheet holder in the horizontal and vertical directions is fixed with respect to the pattern display device and the image capture device during the testing of the glass sheet to be tested; and the glass plate support is provided with a pitching adjusting device and a horizontal swinging device which are mutually independent, the pitching adjusting device is used for adjusting the glass plate to be detected to enable the glass plate to be supported on the glass plate support at a pitching angle in a working state, and the horizontal swinging device is used for enabling the glass plate to be detected to rotate in the horizontal direction so as to detect different parts of the glass plate to be detected.
9. A glass optical distortion detection system as claimed in claim 2 wherein the image capture device comprises a camera array of a plurality of cameras, each of the plurality of cameras being adapted to capture a sub-image of a respective local area of the inspection pattern displayed by the display panel through the glass sheet to be inspected; and the image processing and computing system stitches together the sub-images acquired by the plurality of cameras.
10. The glass optical distortion detection system of claim 9, wherein the detection pattern includes a pattern for marking the boundaries of each of the local regions.
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| CN201921235920.6U CN210487642U (en) | 2019-08-01 | 2019-08-01 | Glass optical distortion detection system |
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| CN201921235920.6U CN210487642U (en) | 2019-08-01 | 2019-08-01 | Glass optical distortion detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441331A (en) * | 2019-08-01 | 2019-11-12 | 北京杰福科技有限公司 | Glass optical distortion detection system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441331A (en) * | 2019-08-01 | 2019-11-12 | 北京杰福科技有限公司 | Glass optical distortion detection system and method |
| CN110441331B (en) * | 2019-08-01 | 2024-04-12 | 北京杰福科技有限公司 | Glass optical distortion detection system and method |
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