CN110308157A - A kind of method and device of detection transparent print cross cutting quality - Google Patents
A kind of method and device of detection transparent print cross cutting quality Download PDFInfo
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- CN110308157A CN110308157A CN201910723421.XA CN201910723421A CN110308157A CN 110308157 A CN110308157 A CN 110308157A CN 201910723421 A CN201910723421 A CN 201910723421A CN 110308157 A CN110308157 A CN 110308157A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
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Abstract
This application provides a kind of method and devices of detection transparent print cross cutting quality.The described method includes: the light transmittance according to light source relative to vertical range and printed matter between the angle of incident parallel light, light source and printed matter, adjustment light source injects the incident angle when printed matter, and the angle according to light source relative to incident parallel light, adjust the angle in video camera between the corresponding central axes of camera lens and horizontal plane, image to be detected is obtained after opening light source, if existing defects region in image to be detected, it is determined that there are quality problems for printed matter.There are incident angles when due to effective sunlight injection printed matter, therefore, effective sunlight will appear violent angle change in the cross cutting edge of printed matter and fault location, this angle change can be clearly embodied in image to be detected, this method can clearly judge the cross cutting quality of the intersection of label paper image and base stock image, and then can be improved cross cutting quality testing effect.
Description
Technical field
This application involves printed matter detection technique field, in particular to a kind of method of detection transparent print cross cutting quality
And device.
Background technique
Traditional die-cutting process is a kind of cutting process of printed matter post-production, can be printed matter according to prior design
Printed matter is rolled according to die cutter version be cut into required shape under the effect of the pressure by good graphic making at die cutter version.
Transparent print is a kind of current widely used printed matter.Transparent print has very much, with all-transparent
For label printed matter, the label printed matter of all-transparent requires label paper and base stock is transparent material, die-cutting process and biography
The die-cutting process of system is identical.The label printed matter of all-transparent is usually made of plane materiel, binder, silicone coating and base stock, mould
Cutting mode in cutting process is no longer traditional full cutting, but half cut-off, as long as cutting off surface material, base stock is still kept
Original state.Whether the cutting of the label printed matter of all-transparent, which meets the requirements, is very important in whole process, directly
Product quality and labeling speed etc. are influenced, therefore the detection work for reinforcing the label printed matter cross cutting quality of all-transparent is
Very it is necessary to.
However, light is usually vertically injected printed matter when detecting the cross cutting quality of transparent print by the prior art
Method obtain imaging, since label and base stock are transparent material in transparent print, the light transmittance difference of the two is smaller,
Therefore, after light vertically injects printed matter, label paper image and the contrast of base stock image are lower in imaging obtained, can not
Clearly judge the cross cutting quality of the intersection of label paper image and base stock image, and then leads to the detection effect of cross cutting quality not
It is good.
Based on this, a kind of method for needing detection transparent print cross cutting quality at present, for solving light in the prior art
After line vertically injects printed matter, the cross cutting matter of label paper image Yu base stock image can not be clearly judged in imaging obtained
Amount, and then cause to be die cut the ineffective problem of quality testing.
Summary of the invention
This application provides a kind of method and devices of detection transparent print cross cutting quality, can be used for solving in existing skill
After art light vertically injects printed matter, the boundary of label area Yu base stock region can not be clearly judged in imaging obtained
The cross cutting quality at place, and then the technical problem for causing detection effect bad.
In a first aspect, the embodiment of the present application provides a kind of method of detection transparent print cross cutting quality, the method is answered
For transparent cross cutting quality detecting system, the system comprises detection platform, video camera and light sources；The detection platform is for putting
Set printed matter, the video camera setting is in the upside of the detection platform, and the camera lens of the video camera is towards the printed matter
Front, the light source is set to the downside of the detection platform, and the light emission that issues of the light source enters the back of the printed matter
It is simultaneously projected from the front of the printed matter in face；The described method includes:
According to the light source relative to the vertical range between the angle of incident parallel light, the light source and the printed matter
And the light transmittance of the printed matter, adjust the incident angle when light source injects the printed matter；
Angle according to the light source relative to incident parallel light, adjust in the video camera the corresponding central axes of camera lens with
Angle between horizontal plane；
Open the light source；
Obtain the collected image to be detected of the video camera；
Judge with the presence or absence of defect area in described image to be detected, if there is defect area, it is determined that the printing
There are quality problems for product.
Optionally, according to vertical range between the attribute of the light source, the light source and the printed matter and described
The light transmittance of printed matter adjusts the incident angle when light source injects the printed matter, comprising:
If the light source is less than first threshold, and the light source and the printed matter relative to the angle of incident parallel light
Between vertical range be greater than or equal to second threshold, and the light transmittance of the printed matter be greater than or equal to third threshold value, then really
Incident angle when the fixed light source injects the printed matter is in the first pre-set interval；
If the light source relative to incident parallel light angle be greater than or equal to the first threshold, and the light source with
Vertical range between the printed matter is less than the second threshold, and the light transmittance of the printed matter is less than the third threshold
Value, it is determined that the incident angle when light source injects the printed matter is in the second pre-set interval；
If the angle of the light source incidence directional light is less than the first threshold, and meets the light source and the printing
Vertical range between product is less than the second threshold and the light transmittance of the printed matter is less than in the third threshold value at least
One condition, it is determined that the incident angle when light source injects the printed matter is in third pre-set interval；
If the angle of the light source incidence directional light is greater than or equal to the first threshold, and meets the light source and institute
It states the vertical range between printed matter and is greater than or equal to the light transmittance of the second threshold and the printed matter more than or equal to institute
State at least one condition in third threshold value, it is determined that the incident angle when light source injects the printed matter is in the third
In pre-set interval；
Wherein, the maximum value of first pre-set interval is less than the minimum value of the third pre-set interval, and the third is pre-
If the maximum value in section is less than the minimum value of second pre-set interval.
Optionally, before opening the light source, the method also includes:
According to the coke of camera lens in the detection resolution of the video camera, the pixel dimension of the video camera and the video camera
Away from adjusting the vertical range between the video camera and the printed matter；
According between the video camera and the printed matter vertical range and the light source relative to incident parallel light
Angle adjusts the video camera and the direct horizontal distance of the light source.
Optionally, the vertical range between the video camera and the printed matter determines in the following manner:
Wherein, vertical range of the W between the video camera and the printed matter；P is that the detection of the video camera is differentiated
Rate；D is the pixel dimension of the video camera；F is the focal length of camera lens in the video camera.
Optionally, described image to be detected includes base stock image and label image；
Judge with the presence or absence of defect area in described image to be detected, if there is defect area, it is determined that the printing
There are quality problems for product, comprising:
Whether the intersection for judging the base stock image and the label image is continuous and smooth black lines, if
The intersection of the base stock image and the printed matter image is not continuous and smooth black lines, it is determined that the printed matter
There are quality problems；
Judge with the presence or absence of black region in the base stock image or the label image, if the base stock image or institute
State in label image that there are black regions, it is determined that there are quality problems for the printed matter.
Optionally, the light source is linear light source.
Second aspect, the embodiment of the present application provide a kind of device of detection transparent print cross cutting quality, and described device is answered
For transparent cross cutting quality detecting system, the system comprises detection platform, video camera and light sources；The detection platform is for putting
Set printed matter, the video camera setting is in the upside of the detection platform, and the camera lens of the video camera is towards the printed matter
Front, the light source is set to the downside of the detection platform, and the light emission that issues of the light source enters the back of the printed matter
It is simultaneously projected from the front of the printed matter in face；Described device includes:
Adjustment unit, for according to the light source relative to the angle of incident parallel light, the light source and the printed matter
Between vertical range and the printed matter light transmittance, adjust the incident angle when light source injects the printed matter；
And the angle according to the light source relative to incident parallel light, adjust the corresponding central axes of camera lens and water in the video camera
Angle between plane；
Control unit, for opening the light source；
Acquiring unit, for obtaining the collected image to be detected of the video camera；
Detection unit, for judging with the presence or absence of defect area in described image to be detected, if there is defect area, then
Determine that there are quality problems for the printed matter.
Optionally, the adjustment unit is specifically used for:
If the light source is less than first threshold, and the light source and the printed matter relative to the angle of incident parallel light
Between vertical range be greater than or equal to second threshold, and the light transmittance of the printed matter be greater than or equal to third threshold value, then really
Incident angle when the fixed light source injects the printed matter is in the first pre-set interval；
If the light source relative to incident parallel light angle be greater than or equal to the first threshold, and the light source with
Vertical range between the printed matter is less than the second threshold, and the light transmittance of the printed matter is less than the third threshold
Value, it is determined that the incident angle when light source injects the printed matter is in the second pre-set interval；
If the angle of the light source incidence directional light is less than the first threshold, and meets the light source and the printing
Vertical range between product is less than the second threshold and the light transmittance of the printed matter is less than in the third threshold value at least
One condition, it is determined that the incident angle when light source injects the printed matter is in third pre-set interval；
If the angle of the light source incidence directional light is greater than or equal to the first threshold, and meets the light source and institute
It states the vertical range between printed matter and is greater than or equal to the light transmittance of the second threshold and the printed matter more than or equal to institute
State at least one condition in third threshold value, it is determined that the incident angle when light source injects the printed matter is in the third
In pre-set interval；
Wherein, the maximum value of first pre-set interval is less than the minimum value of the third pre-set interval, and the third is pre-
If the maximum value in section is less than the minimum value of second pre-set interval.
Optionally, before described control unit opens the light source, the adjustment unit is also used to:
According to the coke of camera lens in the detection resolution of the video camera, the pixel dimension of the video camera and the video camera
Away from adjusting the vertical range between the video camera and the printed matter；And according to the video camera and the printed matter it
Between angle relative to incident parallel light of vertical range and the light source, adjust the video camera and the direct water of the light source
Flat distance.
Optionally, the vertical range between the video camera and the printed matter determines in the following manner:
Wherein, vertical range of the W between the video camera and the printed matter；P is that the detection of the video camera is differentiated
Rate；D is the pixel dimension of the video camera；F is the focal length of camera lens in the video camera.
Optionally, described image to be detected includes base stock image and label image；
The detection unit is specifically used for:
Whether the intersection for judging the base stock image and the label image is continuous and smooth black lines, if
The intersection of the base stock image and the printed matter image is not continuous and smooth black lines, it is determined that the printed matter
There are quality problems；And judge with the presence or absence of black region in the base stock image or the label image, if the bottom
There are black regions in paper image or the label image, it is determined that there are quality problems for the printed matter.
Optionally, the light source is linear light source.
Angle central axes corresponding with camera lens in video camera and water using the above method, when by adjusting injection printed matter
Angle between plane can control the incident angle that light source injects the effective sunlight of printed matter.It will in compared with the existing technology
Light is vertically injected for the method for printed matter, in the embodiment of the present application, due to there is incidence when effective sunlight injects printed matter
Angle, therefore, effective sunlight will appear violent angle change in the cross cutting edge of printed matter and fault location, and this angle becomes
Change can clearly be embodied in image to be detected, such as cross cutting edge in image to be detected can degree of being contrasted it is obvious
Black lines, for another example fault location in image to be detected can the apparent black region of degree of being contrasted, in this way, the application
The method that embodiment provides can clearly judge the cross cutting quality of the intersection of label paper image and base stock image, and then can
Improve cross cutting quality testing effect.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for cross cutting quality detecting system that the embodiment of the present application is applicable in；
Fig. 2 is that process corresponding to a kind of method of detection transparent print cross cutting quality provided by the embodiments of the present application is shown
It is intended to；
Fig. 3 is that flow diagram corresponding to the method for incident angle is adjusted in the embodiment of the present application；
Fig. 4 is a kind of structural schematic diagram of printed matter provided by the embodiments of the present application；
Fig. 5 is the schematic diagram that a kind of light provided by the embodiments of the present application injects printed matter；
Fig. 6 is the structural schematic diagram for the device that a kind of detection transparent print provided by the embodiments of the present application is die cut quality.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with attached drawing to the application embodiment party
Formula is described in further detail.
Combine Fig. 1 that the framework for the cross cutting quality detecting system that the embodiment of the present application is applicable in is introduced first below.
Referring to FIG. 1, it illustrates the transparent cross cutting quality detecting system of one kind that the embodiment of the present application is applicable in
Structural schematic diagram.The system 100 may include detection platform 101, video camera 102 and light source 103.Wherein, detection platform 101 can
For placing printed matter 104；Video camera 102 can be set in the upside of detection platform 101, and the camera lens of video camera 102
1021 towards the front of printed matter 104；Light source 103 can be set in the downside of detection platform 101, and light source 103 may include
Light-emitting surface 1031, the light issued from light-emitting surface 1031 can inject the back side of printed matter 104 and penetrate from the front of printed matter 104
Out.
Further, this be can also include control device (not shown in figure 1).Control device can by network with take the photograph
Camera 102 and light source 103 connect, so as to control position and the angle of video camera 102 and light source 103.
It should be noted that light source can be linear light source, for example, the linear light source can be in the embodiment of the present application
LED light source.Rim ray in linear light source can be used for detecting transparent print, compared to the uniform high directional light of manufacture
Source, linear light source realizability used by the embodiment of the present application is very high, and low cost, can reduce cost of light source.
Correspondingly, video camera may be linear video camera.
Based on system architecture shown in FIG. 1, Fig. 2 illustrates a kind of transparent print of detection provided by the embodiments of the present application
Brush product are die cut flow diagram corresponding to the method for quality.As shown in Fig. 2, specifically comprising the following steps:
Step 201, according to light source relative to vertical between the angle of incident parallel light, the light source and the printed matter
The light transmittance of distance and the printed matter, adjusts the incident angle when light source injects the printed matter.
Step 202, it is corresponding to adjust camera lens in the video camera for the angle according to the light source relative to incident parallel light
Angle between central axes and horizontal plane.
Step 203, the light source is opened.
Step 204, the collected image to be detected of the video camera is obtained.
Step 205, judge with the presence or absence of defect area in described image to be detected, if there is defect area, it is determined that
There are quality problems for the printed matter.
It should be noted that above-mentioned steps 201 to step 205 can control device execution；Alternatively, in system shown in fig. 1
When not including control device in system framework, detection platform 101 can be set and connect by network with video camera 102 and light source 103,
And above-mentioned steps 201 are executed by detection platform 101 to step 205.
Angle central axes corresponding with camera lens in video camera and water using the above method, when by adjusting injection printed matter
Angle between plane can control the incident angle that light source injects the effective sunlight of printed matter.It will in compared with the existing technology
Light is vertically injected for the method for printed matter, in the embodiment of the present application, due to there is incidence when effective sunlight injects printed matter
Angle, therefore, effective sunlight will appear violent angle change in the cross cutting edge of printed matter and fault location, and this angle becomes
Change can clearly be embodied in image to be detected, such as cross cutting edge in image to be detected can degree of being contrasted it is obvious
Black lines, for another example fault location in image to be detected can the apparent black region of degree of being contrasted, in this way, the application
The method that embodiment provides can clearly judge the cross cutting quality of the intersection of label paper image and base stock image, and then can
Improve cross cutting quality testing effect.
Specifically, in step 201, light source inject printed matter when incident angle influence factor have it is multiple, for example, entering
Firing angle degree will receive influence of the light source relative to the angle of incident parallel light；Alternatively, incident angle also will receive light source and printing
The influence of vertical range between product；Alternatively, incident angle also suffers from the influence of the light transmittance of printed matter.Wherein, incident flat
Row light can refer to the directional light for injecting printed matter.
It should be noted that the influence of incident angle when light source injects printed matter may also suffer from the knot of light source itself
The influence of structure.Wherein, the structure of light source itself may include mechanical structure, light-emitting surface transmission plate material, the lamp bead particle angle of divergence
The structures such as degree, emergent light reshaping structure.It may include acrylic board, matte board, Fresnel lenses etc. that light-emitting surface, which transmits plate material,
Material.
Lower mask body introduces the method for adjustment of incident angle, can specifically refer to Fig. 3, and Fig. 3 illustrates the application
Flow diagram corresponding to the method for incident angle is adjusted in embodiment, is included the following steps:
Step 301, judge whether light source is less than first threshold relative to the angle of incident parallel light, if it is less than the first threshold
Value, thens follow the steps 302；Otherwise, step 306 is executed.
Step 302, judge whether the vertical range between light source and printed matter is greater than or equal to second threshold, if it is greater than
Or it is equal to second threshold, then follow the steps 303；Otherwise, step 305 is executed.
Step 303, judge whether the light transmittance of printed matter is greater than or equal to third threshold value, if it is greater than or equal to third threshold
Value, thens follow the steps 304；Otherwise, step 305 is executed.
Step 304, determine incident angle when light source injects printed matter in the first pre-set interval.
Step 305, determine incident angle when light source injects printed matter in third pre-set interval.
Step 306, judge whether the vertical range between light source and printed matter is less than second threshold, if it is less than the second threshold
Value, thens follow the steps 307；Otherwise, step 309 is executed.
Step 307, judge whether the light transmittance of printed matter is less than third threshold value, if it is less than third threshold value, then execute step
Rapid 308；Otherwise, step 309 is executed.
Step 308, determine incident angle when light source injects printed matter in the second pre-set interval.
Step 309, determine incident angle when light source injects printed matter in third pre-set interval.
It should be understood that (1) above-mentioned steps 301, into step 309, it is pre- that the maximum value of the first pre-set interval is less than third
If the minimum value in section, the minimum value of the maximum value of third pre-set interval less than the second pre-set interval；(2) first threshold, second
Threshold value and third threshold value may each be what those skilled in the art rule of thumb set with actual conditions, specifically without limitation.
Another expression way of above-mentioned steps 301 to method described in step 309 can be that light source goes out light type and gets over
Close to source of parallel light, i.e. the light source emergent ray angle that includes is fewer, and light source light-emitting angle is smaller when adjusting.Conversely, light source goes out
Penetrate that the angle that light includes is more, and light-source angle is bigger.The height of light source distance detection faces is bigger simultaneously, detects the translucency of material
Better, light-source angle is smaller.
Further, the value range of incident angle when light source injection printed matter can be between 30 ° to 60 °.
Further, in conjunction with above-mentioned steps 301 to 309 and the value range of incident angle, the first pre-set interval can
Be [30 °, 40 °)；Second pre-set interval can be [50 °, 60 °)；Third pre-set interval can be [40 °, 50 °).
In step 202, it is contemplated that light source used herein can be linear light source, the light phase which is included
May be different for the angle of incident parallel light, therefore, in the embodiment of the present application, adjust the corresponding central axes of camera lens in video camera
The mode of angle between horizontal plane can there are many.
In one example, can maximum angle according to light source relative to incident parallel light, adjust camera lens pair in video camera
Angle between the central axes answered and horizontal plane.For example, can using light source relative to incident parallel light maximum angle as taking the photograph
Angle in camera between the corresponding central axes of camera lens and horizontal plane.Light source can be by relative to the maximum angle of incident parallel light
Light source type and outgoing light characteristic determine.
In another example, can different angle according to the light that light source includes relative to incident parallel light, adjustment takes the photograph
Angle in camera between the corresponding central axes of camera lens and horizontal plane.For example, can be by light that light source includes relative to incidence
The corresponding average value of the different angle of directional light, as the angle between the corresponding central axes of camera lens in video camera and horizontal plane.
Further, the value range of the angle in video camera between the corresponding central axes of camera lens and horizontal plane can be
Between 30 ° to 50 °.
Before executing above-mentioned steps 203, the embodiment of the present application can also adjust the position of video camera.For example, can adjust
Vertical range and video camera and the direct horizontal distance of light source between whole video camera and printed matter.
Specifically, for the adjustment of the vertical range between video camera and printed matter, the embodiment of the present application can be according to taking the photograph
The focal length of camera lens in the detection resolution of camera, the pixel dimension of video camera and video camera adjusts between video camera and printed matter
Vertical range.Wherein, the detection resolution of video camera may be influenced by material breadth, and specifically, material breadth is bigger,
The detection resolution of video camera is required higher.
Further, the vertical range between video camera and the printed matter is determined by formula (1).
In formula (1), vertical range of the W between the video camera and printed matter；P is the detection resolution of video camera；D
For the pixel dimension of video camera；F is the focal length of camera lens in video camera.
For the adjustment of video camera and the direct horizontal distance of light source, the embodiment of the present application can be according to video camera and printing
The angle of vertical range and light source relative to incident parallel light between product, adjustment video camera and the direct horizontal distance of light source.
Specifically, the vertical range between video camera and printed matter is smaller, and video camera and the direct horizontal distance of light source are smaller；Light source
Angle relative to incident parallel light is smaller, and video camera and the direct horizontal distance of light source are smaller.
In step 203 to step 205, after opening light source, the light of video camera is able to enter in the light that light source projects, it can
To be referred to as effective sunlight.Due to the integrally-built limitation of the cross cutting quality detecting system, the especially limitation of light-source structure,
The angular range for being able to enter the light of video camera is smaller, realizes using small range angle light to the transparent mesh for being die-cut to picture
's.
As shown in figure 4, being a kind of structural schematic diagram of printed matter provided by the embodiments of the present application.The printed matter 104 can be with
Including base stock 1041 and label paper 1042.Correspondingly, the collected image to be detected of video camera may include base stock image and mark
Sign image.
In order to preferably detect printed matter cross cutting quality, the embodiment of the present application can judge described from following many aspects
It whether there is defect area in image to be detected.
In a first aspect, whether the intersection for judging base stock image and label image is continuous and smooth black lines, such as
The intersection of fruit base stock image and printed matter image is not continuous and smooth black lines, it is determined that there are quality to ask for printed matter
Topic；If the intersection of base stock image and printed matter image is continuous and smooth black lines, it is determined that printed matter is not present
Quality problems.
Above-mentioned judgment mode is the refraction principle based on light to judge, light is in cross cutting edge (i.e. base stock and mark
Sign the intersection of paper) occur acutely to change, it cannot be introduced into video camera, therefore, cross cutting edge imaging is the high black of contrast
Lines.
Further, qualified cross cutting end face is very smooth, therefore the black lines for being die cut edge imaging generally only have 2-3
A pixel wide, detection accuracy are very high.
Further, the corresponding quality problems of these black lines can specifically include and be die cut imperfect, burr, missing
With positional shift and other issues, specifically without limitation.
In order to clearly describe light in the refraction situation of base stock and the intersection of label paper, come below by Fig. 5
Exemplary illustration.As shown in figure 5, for a kind of schematic diagram of light injection printed matter provided by the embodiments of the present application.
It can see according to the content shown in Fig. 5, for printed matter after cross cutting, the cross cutting edge of label paper has two
Side, be respectively shown in Fig. 5 first while and when second.Due to the step eminence of the first side formation and entering for light source effective sunlight
Firing angle degree is opposite, and therefore, effective sunlight will occur acutely to change on the first side, cannot be introduced into camera, in this way, the first side is to be checked
An apparent black lines are imaged as in altimetric image.The incidence angle of step eminence and light source effective sunlight that second side is formed
In the same direction, the angle after effective sunlight is injected will change degree, and part effective sunlight not can enter camera, and therefore, the second side exists
Imaging in image to be detected is also a black lines, but its contrast is slightly weaker than the first side image contrast.
Further, since the black lines of label paper image and the intersection of base stock image are by effective sunlight in label
What the angle acute variation that the cross cutting end face of fabric occurs was formed, and qualified cross cutting end face is very smooth, therefore is die cut edge
The black line of imaging generally only has 2-3 pixel wide, and detection accuracy is very high.
Second aspect judges with the presence or absence of black region in base stock image or label image, if base stock image or label
There are black regions in image, it is determined that there are quality problems for printed matter；If be not present in base stock image and label image
Black region, it is determined that quality problems are not present in printed matter.
Above-mentioned judgment mode is again based on the refraction principle of light to judge, light is sent out in the fault location of printed matter
It is raw acutely to change, it cannot be introduced into video camera, therefore, the fault location of printed matter is imaged as the high black region of contrast.
Further, the corresponding quality problems of these black regions can specifically include hole deviation, folding line, scuffing, wrinkle
With greasy dirt and other issues, specifically without limitation.
Following is the application Installation practice, can be used for executing the application embodiment of the method.It is real for the application device
Undisclosed details in example is applied, the application embodiment of the method is please referred to.
Fig. 6 illustrates the knot of the device of the transparent detection printed matter cross cutting quality of one kind provided by the embodiments of the present application
Structure schematic diagram.As shown in fig. 6, the device has the function of the method for realizing above-mentioned detection printed matter cross cutting quality, the function
Corresponding software realization can also be executed by hardware by hardware realization.The device can be applied to transparent cross cutting quality inspection
Examining system, the system comprises detection platform, video camera and light sources；The detection platform is for placing printed matter, the camera shooting
Machine is set to the upside of the detection platform, and the camera lens of the video camera, towards the front of the printed matter, the light source is set
It is placed in the downside of the detection platform, and the light emission that issues of the light source enters the back side of the printed matter and from the printed matter
It projects in front；The apparatus may include: adjustment unit 601, control unit 602, acquiring unit 603 and detection unit 604.
Adjustment unit 601, for according to the light source relative to the angle of incident parallel light, the light source and the printing
The light transmittance of vertical range and the printed matter between product, adjusts the incidence angle when light source injects the printed matter
Degree；And the angle according to the light source relative to incident parallel light, adjust in the video camera the corresponding central axes of camera lens with
Angle between horizontal plane；
Control unit 602, for opening the light source；
Acquiring unit 603, for obtaining the collected image to be detected of the video camera；
Detection unit 604, for judging with the presence or absence of defect area in described image to be detected, if there is defect area
Domain, it is determined that there are quality problems for the printed matter.
Optionally, the adjustment unit 601 is specifically used for:
If the light source is less than first threshold, and the light source and the printed matter relative to the angle of incident parallel light
Between vertical range be greater than or equal to second threshold, and the light transmittance of the printed matter be greater than or equal to third threshold value, then really
Incident angle when the fixed light source injects the printed matter is in the first pre-set interval；
If the light source relative to incident parallel light angle be greater than or equal to the first threshold, and the light source with
Vertical range between the printed matter is less than the second threshold, and the light transmittance of the printed matter is less than the third threshold
Value, it is determined that the incident angle when light source injects the printed matter is in the second pre-set interval；
If the angle of the light source incidence directional light is less than the first threshold, and meets the light source and the printing
Vertical range between product is less than the second threshold and the light transmittance of the printed matter is less than in the third threshold value at least
One condition, it is determined that the incident angle when light source injects the printed matter is in third pre-set interval；
If the angle of the light source incidence directional light is greater than or equal to the first threshold, and meets the light source and institute
It states the vertical range between printed matter and is greater than or equal to the light transmittance of the second threshold and the printed matter more than or equal to institute
State at least one condition in third threshold value, it is determined that the incident angle when light source injects the printed matter is in the third
In pre-set interval；
Wherein, the maximum value of first pre-set interval is less than the minimum value of the third pre-set interval, and the third is pre-
If the maximum value in section is less than the minimum value of second pre-set interval.
Optionally, before described control unit 602 opens the light source, the adjustment unit is also used to:
According to the coke of camera lens in the detection resolution of the video camera, the pixel dimension of the video camera and the video camera
Away from adjusting the vertical range between the video camera and the printed matter；And according to the video camera and the printed matter it
Between angle relative to incident parallel light of vertical range and the light source, adjust the video camera and the direct water of the light source
Flat distance.
Optionally, the vertical range between the video camera and the printed matter determines in the following manner:
Wherein, vertical range of the W between the video camera and the printed matter；P is that the detection of the video camera is differentiated
Rate；D is the pixel dimension of the video camera；F is the focal length of camera lens in the video camera.
Optionally, described image to be detected includes base stock image and label image；
The detection unit 604 is specifically used for:
Whether the intersection for judging the base stock image and the label image is continuous and smooth black lines, if
The intersection of the base stock image and the printed matter image is not continuous and smooth black lines, it is determined that the printed matter
There are quality problems；And judge with the presence or absence of black region in the base stock image or the label image, if the bottom
There are black regions in paper image or the label image, it is determined that there are quality problems for the printed matter.
Angle central axes corresponding with camera lens in video camera and water using above-mentioned apparatus, when by adjusting injection printed matter
Angle between plane can control the incident angle that light source injects the effective sunlight of printed matter.It will in compared with the existing technology
Light is vertically injected for the method for printed matter, in the embodiment of the present application, due to there is incidence when effective sunlight injects printed matter
Angle, therefore, effective sunlight will appear violent angle change in the cross cutting edge of printed matter and fault location, and this angle becomes
Change can clearly be embodied in image to be detected, such as cross cutting edge in image to be detected can degree of being contrasted it is obvious
Black lines, for another example fault location in image to be detected can the apparent black region of degree of being contrasted, in this way, the application
The method that embodiment provides can clearly judge the cross cutting quality of the intersection in label area and base stock region, and then can mention
Height cross cutting quality testing effect.
In the exemplary embodiment, a kind of computer readable storage medium is additionally provided, is stored in the storage medium
Computer program or intelligent contract, the computer program or intelligent contract are loaded and executed by nodes to realize above-described embodiment
The transaction methods of offer.Optionally, above-mentioned computer readable storage medium can be read-only memory (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), CD-ROM, tape, floppy disk and
Optical data storage devices etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present application can add by software
The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present application substantially or
Say that the part that contributes to existing technology can be embodied in the form of software products, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that computer equipment (can be with
It is personal computer, server or the network equipment etc.) execute certain part institutes of each embodiment of the application or embodiment
The method stated.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (10)
1. a kind of method of detection transparent print cross cutting quality, the method are applied to transparent cross cutting quality detecting system, institute
The system of stating includes detection platform, video camera and light source；The detection platform is for placing printed matter, and the video camera setting is in institute
The upside of detection platform is stated, and the camera lens of the video camera, towards the front of the printed matter, the light source is set to the inspection
The downside of platform is surveyed, and the light emission that the light source issues enters the back side of the printed matter and projects from the front of the printed matter；
It is characterized in that, which comprises
According to the light source relative between the angle of incident parallel light, the light source and the printed matter vertical range and
The light transmittance of the printed matter adjusts the incident angle when light source injects the printed matter；
Angle according to the light source relative to incident parallel light adjusts the corresponding central axes of camera lens and level in the video camera
Angle between face；
Open the light source；
Obtain the collected image to be detected of the video camera；
Judge with the presence or absence of defect area in described image to be detected, if there is defect area, it is determined that the printed matter is deposited
In quality problems.
2. the method according to claim 1, wherein according to the attribute of the light source, the light source and the print
The light transmittance of vertical range and the printed matter between brush product, adjusts the incidence angle when light source injects the printed matter
Degree, comprising:
If the light source is less than first threshold relative to the angle of incident parallel light, and between the light source and the printed matter
Vertical range be greater than or equal to second threshold, and the light transmittance of the printed matter be greater than or equal to third threshold value, it is determined that institute
Incident angle when light source injects the printed matter is stated in the first pre-set interval；
If the light source relative to incident parallel light angle be greater than or equal to the first threshold, and the light source with it is described
Vertical range between printed matter is less than the second threshold, and the light transmittance of the printed matter is less than the third threshold value, then
Determine the incident angle when light source injects the printed matter in the second pre-set interval；
If the angle of the light source incidence directional light is less than the first threshold, and meet the light source and the printed matter it
Between vertical range be less than the light transmittance of the second threshold and the printed matter and be less than at least one of described third threshold value
Condition, it is determined that the incident angle when light source injects the printed matter is in third pre-set interval；
If the angle of the light source incidence directional light is greater than or equal to the first threshold, and meets the light source and the print
The light transmittance that vertical range between brush product is greater than or equal to the second threshold and the printed matter is greater than or equal to described the
At least one condition in three threshold values, it is determined that the incident angle when light source injects the printed matter is preset in the third
In section；
Wherein, the maximum value of first pre-set interval is less than the minimum value of the third pre-set interval, the third preset areas
Between maximum value be less than second pre-set interval minimum value.
3. the method according to claim 1, wherein before opening the light source, the method also includes:
According to the focal length of camera lens in the detection resolution of the video camera, the pixel dimension of the video camera and the video camera,
Adjust the vertical range between the video camera and the printed matter；
According to the angle of vertical range and the light source relative to incident parallel light between the video camera and the printed matter,
Adjust the video camera and the direct horizontal distance of the light source.
4. according to the method described in claim 3, it is characterized in that, vertical range between the video camera and the printed matter
It determines in the following manner:
Wherein, vertical range of the W between the video camera and the printed matter；P is the detection resolution of the video camera；D
For the pixel dimension of the video camera；F is the focal length of camera lens in the video camera.
5. method according to claim 1 to 4, which is characterized in that described image to be detected includes base stock figure
Picture and label image；
Judge with the presence or absence of defect area in described image to be detected, if there is defect area, it is determined that the printed matter is deposited
In quality problems, comprising:
Whether the intersection for judging the base stock image and the label image is continuous and smooth black lines, if described
The intersection of base stock image and the printed matter image is not continuous and smooth black lines, it is determined that the printed matter exists
Quality problems；
Judge with the presence or absence of black region in the base stock image or the label image, if the base stock image or the mark
There are black regions in label image, it is determined that there are quality problems for the printed matter.
6. the method according to claim 1, wherein the light source is linear light source.
7. a kind of device of detection transparent print cross cutting quality, described device clear applications are in cross cutting quality detecting system, institute
The system of stating includes detection platform, video camera and light source；The detection platform is for placing printed matter, and the video camera setting is in institute
The upside of detection platform is stated, and the camera lens of the video camera, towards the front of the printed matter, the light source is set to the inspection
The downside of platform is surveyed, and the light emission that the light source issues enters the back side of the printed matter and projects from the front of the printed matter；
It is characterized in that, described device includes:
Adjustment unit, for according to the light source relative between the angle of incident parallel light, the light source and the printed matter
Vertical range and the printed matter light transmittance, adjust the incident angle when light source injects the printed matter；And
Angle according to the light source relative to incident parallel light, adjust in the video camera the corresponding central axes of camera lens and horizontal plane it
Between angle；
Control unit, for opening the light source；
Acquiring unit, for obtaining the collected image to be detected of the video camera；
Detection unit, for judging with the presence or absence of defect area in described image to be detected, if there is defect area, it is determined that
There are quality problems for the printed matter.
8. device according to claim 7, which is characterized in that the adjustment unit is specifically used for:
If the light source is less than first threshold relative to the angle of incident parallel light, and between the light source and the printed matter
Vertical range be greater than or equal to second threshold, and the light transmittance of the printed matter be greater than or equal to third threshold value, it is determined that institute
Incident angle when light source injects the printed matter is stated in the first pre-set interval；
If the light source relative to incident parallel light angle be greater than or equal to the first threshold, and the light source with it is described
Vertical range between printed matter is less than the second threshold, and the light transmittance of the printed matter is less than the third threshold value, then
Determine the incident angle when light source injects the printed matter in the second pre-set interval；
If the angle of the light source incidence directional light is less than the first threshold, and meet the light source and the printed matter it
Between vertical range be less than the light transmittance of the second threshold and the printed matter and be less than at least one of described third threshold value
Condition, it is determined that the incident angle when light source injects the printed matter is in third pre-set interval；
If the angle of the light source incidence directional light is greater than or equal to the first threshold, and meets the light source and the print
The light transmittance that vertical range between brush product is greater than or equal to the second threshold and the printed matter is greater than or equal to described the
At least one condition in three threshold values, it is determined that the incident angle when light source injects the printed matter is preset in the third
In section；
Wherein, the maximum value of first pre-set interval is less than the minimum value of the third pre-set interval, the third preset areas
Between maximum value be less than second pre-set interval minimum value.
9. device according to claim 7, which is characterized in that described before described control unit opens the light source
Adjustment unit is also used to:
According to the focal length of camera lens in the detection resolution of the video camera, the pixel dimension of the video camera and the video camera,
Adjust the vertical range between the video camera and the printed matter；And according between the video camera and the printed matter
Angle relative to incident parallel light of vertical range and the light source, adjust the video camera and the light source be directly horizontal
Distance.
10. device according to any one of claims 7 to 9, which is characterized in that described image to be detected includes base stock figure
Picture and label image；
The detection unit is specifically used for:
Whether the intersection for judging the base stock image and the label image is continuous and smooth black lines, if described
The intersection of base stock image and the printed matter image is not continuous and smooth black lines, it is determined that the printed matter exists
Quality problems；And judge with the presence or absence of black region in the base stock image or the label image, if the base stock figure
There are black regions in picture or the label image, it is determined that there are quality problems for the printed matter.
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| CN201910723421.XA CN110308157B (en) | 2019-08-06 | 2019-08-06 | Method and device for detecting die cutting quality of transparent printed matter |
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|---|---|---|---|
| CN201910723421.XA CN110308157B (en) | 2019-08-06 | 2019-08-06 | Method and device for detecting die cutting quality of transparent printed matter |
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| CN112829002A (en) * | 2020-12-31 | 2021-05-25 | 深圳市诚亿自动化科技有限公司 | COF punching positioning device |
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| CN116550850A (en) * | 2023-05-22 | 2023-08-08 | 深圳市云海电子辅料有限公司 | Spare and accessory part die-cutting device with automatic waste clearing function |
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| CN110308157B (en) | 2022-04-22 |
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