CN110567920B - Detection system for haze of transparent or semitransparent glass - Google Patents
Detection system for haze of transparent or semitransparent glass Download PDFInfo
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- CN110567920B CN110567920B CN201911031255.3A CN201911031255A CN110567920B CN 110567920 B CN110567920 B CN 110567920B CN 201911031255 A CN201911031255 A CN 201911031255A CN 110567920 B CN110567920 B CN 110567920B
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention provides a detection system for haze of transparent or semitransparent glass, which has the advantages of simple structure, low cost and good universality. The glass detection device comprises a CCD/CMOS camera and a universal telecentric light source, wherein a light source of the universal telecentric light source is emitted to the CCD/CMOS camera, glass is arranged between the light source and the camera, an image captured by the CCD/CMOS camera and corresponding to the light source is transmitted to a processor, measuring software is arranged in the processor, the measuring software acquires a first image and a second image in advance, the first image is an image shot by the universal telecentric light source in an open state without glass, the second image is an image shot by the universal telecentric light source in an open state with standard value glass, then in a measuring mode, the glass to be detected is arranged between the light source and the CCD/CMOS camera, the CCD/CMOS camera shoots a third image, the third image is transmitted to the processor, and the measuring software calculates parameters obtained by the first image and the second image, And calculating to obtain a haze value by processing the third image.
Description
Technical Field
The invention relates to the technical field of glass haze detection, in particular to a transparent or semitransparent glass haze detection system.
Background
Haze (haze) is the percentage of the total transmitted intensity of the transmitted light that deviates from the incident by more than 2.5 °, with greater haze indicating a decrease in film gloss and clarity, particularly in image formation. A beam of parallel light from a standard "c" light source is directed perpendicularly onto a transparent or translucent film, sheet, or panel, and due to scattering within and on the material, the fraction of the parallel light that deviates from the incident direction by more than 2.5 ° from the ratio of the scattered light flux Td to the light flux T2 transmitted through the material, i.e.: is an important parameter for the optical transparency of transparent or translucent materials.
The existing haze detection is carried out in an integrating sphere mode, mainstream equipment comprises BYK standard equipment and RhoPoint equipment, the equipment cost is high, the structure is complex, and the universality is poor.
Disclosure of Invention
Aiming at the problems, the invention provides a detection system for the haze of transparent or semitransparent glass, which has the advantages of simple structure, low cost and good universality.
A detection system for haze of transparent or semitransparent glass is characterized in that: the device comprises a CCD/CMOS camera and a universal telecentric light source, wherein a light source of the universal telecentric light source is emitted to the CCD/CMOS camera, glass is placed between the light source and the CCD/CMOS camera, an image corresponding to the light source and captured by the CCD/CMOS camera is transmitted to a processor, measurement software is arranged in the processor, the measurement software acquires a first image and a second image in advance, the first image is an image which is shot in a state that the universal telecentric light source is not glass when being opened, the second image is an image which is shot in a state that standard value glass is arranged when the universal telecentric light source is opened, then the glass to be detected is placed between the light source and the CCD/CMOS camera in a measurement mode, the CCD/CMOS camera shoots a third image, the third image is transmitted to the processor, and the measurement software obtains parameters through calculation of the first image and the second image, By processing the third image, a haze value is obtained by calculation.
It is further characterized in that:
the measurement software presets a height percentage calibration range, an iteration step length and a slice thickness before working, obtains an energy curve corresponding to a second image according to the second image and the position of a central point of an adjustment product image through the parameters, calculates and calibrates the energy sum of a light source in the second image scattered by the glass to be detected, and then calculates and calibrates the energy sum of the light source in the second image through a formula
Calculating to obtain a haze value of the glass to be detected, and comparing the haze value with a standard value, wherein Ts is the scattering energy after the glass is put in, and Tt is the energy curve value after the glass is put in;
then, iterative calculation is carried out, and the height percentage and the offset distance parameter when the difference value is smaller than the threshold value are obtained and are used as calibration parameters so as to measure the corresponding glass product in the following process;
in the area between the light source and the CCD/CMOS camera, the glass to be measured and the incident parallel light of the light source are randomly arranged at the position under the vertical state of the capturing area of the CCD/CMOS camera, the position of the light source away from the glass is adjustable, the position of the camera away from the glass is adjustable, and the visual field of a camera chip can cover the complete light source light spot when no product exists; the receiving surface of the camera is arranged towards the surface to be tested of the glass;
the first image and the second image are compared through measurement software to obtain the positions of boundary points n1 and n4, and then the energy sum of the light source scattered through the glass to be detected is obtained through energy curve calculation;
the height percentages are used to coarsely define the approximate positions of n1 and n4, the offset distances are used to accurately calculate the positions of n1 and n4, the iteration step size is used to iteratively calculate the adjustment step size in coarse definition, the slice thickness is specifically the thickness of the transverse slice, and is one pixel by default, and the angle step size is used to angularly adjust the dividing step size.
After the invention is adopted, the universal CCD/CMOS camera and the universal telecentric light source are used, and the universal CCD/CMOS camera and the universal telecentric light source can be suitable for various glasses after the positions of the universal CCD/CMOS camera and the universal telecentric light source are determined, so that the universal CCD/CMOS camera has good universality and lower cost, the cost is about 1 ten thousand, and compared with the current product, the universal CCD/CMOS camera has greater advantages (more than 20 ten thousand of BYK standard equipment, about 10 ten thousand of RhoPoint equipment and about 5 ten thousand of other equipment); the method is suitable for an off-customization measuring scheme, and the measuring position of the glass can be flexibly adjusted according to the actual situation under the condition that the hardware part is kept unchanged; the algorithm of the measurement software can be customized, and the algorithm part of the matched software can be customized; supporting on-line calibration and measurement; support integrated automation equipment (the existing equipment is difficult to be directly applied to automatic detection equipment due to the problems of volume and the like); the required assembly space is small; in conclusion, the structure is simple, the cost is low, and the universality is good.
Drawings
FIG. 1 is a diagram illustrating a hardware configuration of the present invention;
FIG. 2 is a graph of the energy curve of an image taken by a CCD/CMOS camera of the present invention;
FIG. 3 is a graph of an image taken by a CCD/CMOS camera of the present invention used to calculate energy;
FIG. 4 is a schematic diagram of an intensity image generated by measuring an image captured by a CCD through measurement software;
the names corresponding to the sequence numbers in the figure are as follows:
CCD/CMOS camera 1, general telecentric light source 2.
Detailed Description
A system for detecting haze in transparent or translucent glass, see fig. 1-3: the device comprises a CCD/CMOS camera 1 and a universal telecentric light source 2, wherein a light source of the universal telecentric light source 2 is emitted to the CCD/CMOS camera 1, glass is arranged between the light source and the CCD/CMOS camera 1, an image corresponding to the light source and captured by the CCD/CMOS camera 1 is transmitted to a processor, the processor is internally provided with measurement software, the measurement software acquires a first image and a second image in advance, the first image is an image which is shot in a state that the universal telecentric light source 2 is not glass when opened, the second image is an image which is shot in a state that the universal telecentric light source 2 is opened and the standard value of the glass is set, then in a measurement mode, the glass to be detected is arranged between the universal telecentric light source 2 and the CCD/CMOS camera 1, the CCD/CMOS camera shoots a third image, then the third image is transmitted to the processor, and the measurement software obtains parameters through calculation of the first image and the second image, By processing the third image, a haze value is obtained by calculation.
The measurement software presets a height percentage calibration range, an iteration step length and a slice thickness before working, calculates and calibrates the energy sum of a light source scattered by the glass to be detected in a second image according to the second image and the position of the central point of an adjustment product image through the parameters and then passes through a formula
Calculating to obtain a haze value of the glass to be detected, and comparing the haze value with a standard value, wherein Ts is the scattering energy after the glass is put in, and Tt is the energy curve value after the glass is put in;
then, iterative calculation is carried out, and the height percentage and the offset distance parameter when the difference value is smaller than the threshold value are obtained and are used as calibration parameters, so that the glass product meeting the requirements can be obtained through subsequent measurement;
in the area between the light source and the CCD/CMOS camera 1, the glass to be measured and the incident parallel light of the light source are randomly arranged at the position of the CCD/CMOS camera 1 in the vertical state of the capturing area, the position of the light source away from the glass is adjustable, the position of the camera away from the glass is adjustable, and the vision of a camera chip covers a complete light source light spot when no product exists; the receiving surface of the camera is arranged towards the surface to be tested of the glass;
comparing the positions of the calibrated boundary points n1 and n4 (see fig. 2 and 3) through measurement software, and then calculating to obtain the total energy (the total energy corresponding to the shaded part in fig. 3) scattered by the light source through the glass to be detected;
the height percentage is used for roughly defining the positions of n1 and n4, the offset distance is used for accurately calculating the positions of n1 and n4, the iteration step size is used for iteratively calculating the adjustment step size during rough definition, the slice thickness is specifically the thickness of a transverse slice and is one pixel by default, and in addition, the angle step size is also set for adjusting the division step size by an angle, so that the calculation is fast, efficient and accurate.
The beneficial effects are as follows: the universal CCD/CMOS camera and the universal telecentric light source are used, and the universal CCD/CMOS camera and the universal telecentric light source can be suitable for various glasses after the positions of the universal CCD/CMOS camera and the universal telecentric light source are determined, so that the universal glass has good universality and lower cost, the cost is about 1 ten thousand, and compared with the current product, the universal glass has great advantages (more than 20 thousand BYK standard equipment, about 10 thousand RhoPoint equipment and about 5 thousand other equipment); the method is suitable for an off-customization measuring scheme, and the measuring position of the glass can be flexibly adjusted according to the actual situation under the condition that the hardware part is kept unchanged; the algorithm of the measurement software can be customized, and the algorithm part of the matched software can be customized; supporting on-line calibration and measurement; support integrated automation equipment (the existing equipment is difficult to be directly applied to automatic detection equipment due to the problems of volume and the like); the required assembly space is small; in conclusion, the structure is simple, the cost is low, and the universality is good.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A detection system for haze of transparent or semitransparent glass is characterized in that: the device comprises a CCD/CMOS camera and a universal telecentric light source, wherein a light source of the universal telecentric light source is emitted to the CCD/CMOS camera, glass is placed between the light source and the CCD/CMOS camera, an image corresponding to the light source and captured by the CCD/CMOS camera is transmitted to a processor, measurement software is arranged in the processor, the measurement software acquires a first image and a second image in advance, the first image is an image which is shot in a state that the universal telecentric light source is not glass when being opened, the second image is an image which is shot in a state that standard value glass is arranged when the universal telecentric light source is opened, then the glass to be detected is placed between the light source and the CCD/CMOS camera in a measurement mode, the CCD/CMOS camera shoots a third image, the third image is transmitted to the processor, and the measurement software obtains parameters through calculation of the first image and the second image, Obtaining a haze value through calculation by processing the third image;
the measurement software presets a height percentage calibration range, an iteration step length and a slice thickness before working, obtains an energy curve corresponding to a second image according to the second image and the position of a central point of an adjustment product image through the parameters, calculates and calibrates the energy sum of a light source in the second image scattered by the glass to be detected, and then calculates and calibrates the energy sum of the light source in the second image through a formula
Calculating to obtain a haze value of the glass to be detected, and comparing the haze value with a standard value, wherein Ts is the scattering energy after the glass is put in, and Tt is the energy curve value after the glass is put in;
and then, carrying out iterative calculation, and obtaining the height percentage and the offset distance parameter when the difference value is smaller than the threshold value as calibration parameters so as to subsequently calibrate and measure the corresponding glass product.
2. The system of claim 1, wherein the haze of the transparent or translucent glass is measured by: in the area between the light source and the CCD/CMOS camera, the glass to be measured and the incident parallel light of the light source are randomly arranged at the position under the vertical state of the capturing area of the CCD/CMOS camera, the position of the light source away from the glass is adjustable, the position of the camera away from the glass is adjustable, and the visual field of a camera chip can cover the complete light source light spot when no product exists; the camera receiving surface is arranged towards the surface to be tested of the glass.
3. The system of claim 1, wherein the haze of the transparent or translucent glass is measured by: the first image and the second image are compared through measurement software to obtain the positions of boundary points n1 and n4, and then the energy sum of the light source scattered through the glass to be detected is obtained through energy curve calculation.
4. The system of claim 3, wherein the haze of the transparent or translucent glass is measured by: the height percentages are used for roughly defining the positions of n1 and n4, the offset distances are used for accurately calculating the positions of n1 and n4, the iteration step size is used for iteratively calculating an adjustment step size in rough definition, the slice thickness is specifically the thickness of a transverse slice, is one pixel by default, and is also provided with an angle step size which is used for dividing the step size by angle adjustment.
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| CN111077683B (en) * | 2019-12-30 | 2022-07-26 | 南京奥汀科技发展有限公司 | Intelligent device for rapidly and automatically testing haze consistency of transparent liquid crystal display in batches and detection method |
| CN114324256A (en) * | 2021-12-21 | 2022-04-12 | 福耀玻璃工业集团股份有限公司 | Real-time fogging testing device and real-time fogging testing method |
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