CN113588222B - Ink color consistency detection device and method - Google Patents
Ink color consistency detection device and method Download PDFInfo
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- CN113588222B CN113588222B CN202111129542.5A CN202111129542A CN113588222B CN 113588222 B CN113588222 B CN 113588222B CN 202111129542 A CN202111129542 A CN 202111129542A CN 113588222 B CN113588222 B CN 113588222B
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Abstract
The application relates to an ink consistency detection device and method, which relate to the technical field of optical detection, and the device comprises: the calibration plate is horizontally arranged and used for containing a product to be tested; the first image acquisition device is arranged right above the calibration plate at intervals, and a lens of the first image acquisition device is over against the center of the top surface of the calibration plate; the second image acquisition device is arranged above the calibration plate at intervals, and a lens of the second image acquisition device inclines towards the center of the top surface of the calibration plate at a first inclination angle; and each pair of first light sources is arranged above the calibration plate at intervals and symmetrically arranged on two sides of the center of the top surface of the calibration plate, and obliquely irradiates the center of the top surface of the calibration plate at a second inclination angle. This application is based on predetermined light source and image acquisition device, carries out image acquisition to the product, carries out the analysis based on the image acquisition result and compares to accomplish the detection of black consistency, effectively avoid the error of subjective judgement, improve and detect the accuracy.
Description
Technical Field
The application relates to the technical field of optical detection, in particular to a device and a method for detecting ink color consistency.
Background
With the continuous pursuit of people for large-screen display effect, the quality requirement of the display requirement is higher and higher. The existing manufacturing technology of the high-resolution large-size display is formed by splicing a certain number of small screens with the same resolution and the same size, and the ink color consistency on the surfaces of the certain number of small screens can influence the display effect of the finally spliced high-resolution large-size display. Therefore, it is important how to perform the ink color consistency detection.
Ink color consistency is primarily manifested in color and brightness consistency. In the traditional detection method, the consistency of ink colors is observed by personnel under a fluorescent lamp at different angles, but the judgment of the consistency of the ink colors can be influenced by long-time detection fatigue of the same personnel or detection standards of different personnel, so that the error of a product sorting result can be caused.
Therefore, there is a need for an ink consistency detection technique to meet the current detection requirements.
Disclosure of Invention
The application provides an ink consistency detection device and method, based on a preset light source and an image acquisition device, image acquisition is carried out on a product, and analysis and comparison are carried out based on an image acquisition result, so that the ink consistency detection is completed, errors of subjective judgment are effectively avoided, and the detection accuracy is improved.
In a first aspect, the present application provides an ink consistency detection apparatus, the apparatus comprising:
the calibration plate is horizontally arranged and used for containing a product to be tested;
the first image acquisition devices are arranged right above the calibration plate at intervals, and a lens of each first image acquisition device is over against the center of the top surface of the calibration plate;
the second image acquisition devices are arranged above the calibration plate at intervals, and a lens of each second image acquisition device inclines towards the center of the top surface of the calibration plate at a first inclination angle;
at least one pair of first light sources, wherein each pair of first light sources are arranged above the calibration plate at intervals and symmetrically arranged on two sides of the center of the top surface of the calibration plate, and the first light sources are configured to obliquely irradiate the center of the top surface of the calibration plate at a second inclination angle according to preset light intensity; wherein the content of the first and second substances,
the calibration plate has diffuse reflection characteristics and color characteristics.
Preferably, the first image acquisition device comprises an area array color camera and/or an area array colorimeter;
the second image acquisition device comprises an area array color camera and/or an area array colorimeter.
Specifically, the range value of the first inclination angle is 30-60 degrees.
Further, the apparatus comprises at least two pairs of the first light sources,
the second inclination angles corresponding to each pair of first light sources are different from each other;
the device is configured to obliquely illuminate the center of the top surface of the calibration plate with a pair of the first light sources corresponding to the second inclination angle corresponding to a preset illumination angle requirement.
In a second aspect, the present application provides a method for detecting ink consistency, the method comprising the following steps:
utilizing a preset pair of first light sources to irradiate the center of the top surface of the calibration plate from two sides of the center of the top surface of the calibration plate in an inclined manner at a second inclined angle according to preset light intensity;
placing different products to be measured on the calibration plate one by one, taking images from the position right above the center of the top surface of the calibration plate by using a preset first image acquisition device, and taking images from the position above the top surface of the calibration plate by using a second image acquisition device at a first inclination angle to obtain corresponding image information;
classifying the products to be detected based on the brightness information and the color information of the image information of the products to be detected; wherein the content of the first and second substances,
the calibration plate has diffuse reflection characteristics and color characteristics.
Specifically, the image information includes front-view image information and side-view image information;
the front-view image information comprises front-view brightness information and front-view color information;
the side-view image information includes side-view luminance information and side-view color information.
Specifically, the classifying the to-be-detected product based on the brightness information and the color information of the image information of the to-be-detected product includes the following steps:
comparing the brightness information and the color information of the image information of the product to be detected with preset image parameter ranges with different numerical values, and classifying the products to be detected which accord with the same image parameter range into the same class; wherein the content of the first and second substances,
the image parameter ranges include a front brightness range, a front color range, a side brightness range, and a side color range.
Further, the method comprises the following steps:
calibrating parameters of the first image acquisition device and the second image acquisition device based on brightness information and color information of the image information;
keeping the parameters of the first light source, the first image acquisition device and the second image acquisition device unchanged, and taking images of different products to be detected.
Further, the method comprises the following steps:
and when the number of the products to be detected after image taking exceeds a preset first number, recalibrating the first image acquisition device and the second image acquisition device.
The beneficial effect that technical scheme that this application provided brought includes:
this application is based on predetermined light source and image acquisition device, carries out image acquisition to the product, carries out the analysis based on the image acquisition result and compares to accomplish the detection of black consistency, effectively avoid the error of subjective judgement, improve and detect the accuracy.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of an ink consistency detection apparatus provided in an embodiment of the present application;
fig. 2 is a schematic position diagram of a first image capturing device and a second image capturing device in an ink consistency detection apparatus provided in an embodiment of the present application;
fig. 3 is a plan view of an ink consistency detection apparatus provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of an ink color consistency detection apparatus provided in an embodiment of the present application when the apparatus includes a plurality of pairs of first light sources;
fig. 5 is a plan view of an ink color consistency detection apparatus provided in an embodiment of the present application when the apparatus includes a plurality of pairs of first light sources;
fig. 6 is a schematic diagram of a prior art detection technique corresponding to an ink consistency detection apparatus provided in an embodiment of the present application;
in the figure:
1. calibrating the plate; 2. A first image acquisition device; 3. A second image acquisition device; 4. A first light source; 5. a product to be tested; A. a chromaticity detection device; B. a brightness detection device; C. a light source is detected.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides an ink consistency detection device, based on predetermined light source and image acquisition device, carries out image acquisition to the product, carries out analysis and comparison based on the image acquisition result to accomplish the detection of ink consistency, effectively avoid subjective judgement's error, improve and detect the accuracy.
In order to achieve the technical effects, the general idea of the application is as follows:
an ink consistency detection apparatus, the apparatus comprising:
the calibration plate 1 is horizontally arranged and used for containing a product 5 to be tested;
the first image acquisition devices 2 are arranged right above the calibration plate 1 at intervals, and a lens of each first image acquisition device 2 is over against the center of the top surface of the calibration plate 1;
the second image acquisition devices 3 are arranged above the calibration plate 1 at intervals, and the lens of the second image acquisition devices 3 inclines towards the center of the top surface of the calibration plate 1 at a first inclination angle;
at least one pair of first light sources 4, each pair of first light sources 4 being spaced above the calibration plate 1 and symmetrically disposed at both sides of the center of the top surface of the calibration plate 1, the first light sources 4 being configured to obliquely irradiate the center of the top surface of the calibration plate 1 at a second oblique angle according to a predetermined light intensity.
Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In a first aspect, referring to fig. 1 to 6, an embodiment of the present application provides an ink consistency detection apparatus, including:
the calibration plate 1 is horizontally arranged and used for containing a product 5 to be tested;
the first image acquisition devices 2 are arranged right above the calibration plate 1 at intervals, and a lens of each first image acquisition device 2 is over against the center of the top surface of the calibration plate 1;
the second image acquisition devices 3 are arranged above the calibration plate 1 at intervals, and the lens of the second image acquisition devices 3 inclines towards the center of the top surface of the calibration plate 1 at a first inclination angle;
at least one pair of first light sources 4, each pair of first light sources 4 being spaced above the calibration plate 1 and symmetrically disposed at both sides of the center of the top surface of the calibration plate 1, the first light sources 4 being configured to obliquely irradiate the center of the top surface of the calibration plate 1 at a second oblique angle according to a predetermined light intensity.
It should be noted that fig. 6 of the drawings in the specification illustrates an existing detection technique, in which a chromaticity detection device a, a brightness detection device B, and a detection light source C are used;
the chromaticity detection device A vertically collects images of the product 5 to be detected, the brightness detection device B obliquely collects images of the product 5 to be detected, and the detection light source C irradiates the product 5 to be detected from one side.
Compared with the detection technology, the technical scheme of the embodiment of the application is closer to the result of manual sorting of the manufacturer personnel because the manufacturer personnel can see the color and the brightness information in front view and see the color and the brightness information in 45 degrees in side view when performing manual sorting and then perform manual sorting.
The color and brightness detection values in the embodiment of the application are more accurate, because the surface of the product 5 to be detected is generally coated with glue, the color and brightness of the part of the product 5 to be detected below the glue layer are affected,
when the reflected light is used for extracting the brightness, the light is reflected most on the uppermost glue layer, most of the extracted brightness information belongs to the uppermost layer,
when the diffuse reflection is used for extracting the brightness, brightness information of each part of the glue layer can be collected by the camera, and the brightness is extracted relatively by using the reflected light, so that the extraction structure is more accurate.
In addition, the symmetrical polishing mode in the embodiment of the application can enable the detected image to be more uniform, and the accuracy of data can be improved.
In the embodiment of the application, based on the preset light source and the image acquisition device, the product is subjected to image acquisition, and the image acquisition result is analyzed and compared, so that the ink consistency detection is completed, the error of subjective judgment is effectively avoided, and the detection accuracy is improved.
It should be noted that, the embodiment of the application is based on the diffuse reflection principle, and the brightness and the carried color information of the front-view diffuse reflection light and the brightness and the carried color information of the side-view diffuse reflection light are measured at the same time, so that the ink consistency of the product is accurately detected and sorted, the method can be used for off-line and on-line detection, data support is provided for the production of the product, and valuable process and quality control is efficiently provided for the panel industry.
Preferably, the first image acquisition device 2 comprises an area array color camera and/or an area array colorimeter;
the second image acquisition device 3 comprises an area array color camera and/or an area array colorimeter.
It should be noted that the area-array color camera or the area-array colorimeter is selected according to actual situations, and the area-array color camera and the area-array colorimeter are distinguished in that:
the color camera acquires RGB data, needs to be formatted,
the data output by the colorimeter are x, y and lv, x and y are color information, and lv is luminance information, so that format conversion is not required if the colorimeter is used.
Specifically, the range value of the first inclination angle is 30-60 degrees;
preferably, the optimal angle of the first inclination angle is 45 °.
Preferably, the second inclination angle may be 0 °, 30 ° or 60 °, or may be selected from other angles according to actual requirements.
Further, the ink consistency detection means may include at least two pairs of the first light sources 4;
if necessary, the ink consistency detection means may include a plurality of pairs of the first light sources 4;
the ink consistency detection device is configured to obliquely irradiate the center of the top surface of the calibration plate 1 with a pair of the first light sources 4 corresponding to the second inclination angle corresponding to a preset irradiation angle requirement;
during actual use, the ink consistency detection device comprises a plurality of pairs of first light sources 4, wherein each pair of first light sources 4 is respectively provided with a second inclination angle corresponding to the first light source 4;
when the calibration plate is used, the irradiation angle requirement is firstly acquired, a pair of first light sources 4 corresponding to the second inclination angle of the first light sources and the irradiation angle required by the irradiation angle requirement is selected, and the pair of first light sources 4 is used for obliquely irradiating the center of the top surface of the calibration plate 1 according to the second inclination angle of the first light sources.
When a plurality of pairs of first light sources 4 are adopted, each pair of first light sources 4 is configured with a different second inclination angle, so that a user can select the corresponding first light source 4 only when using the light source, and the angle of the first light source 4 is not required to be adjusted;
on the one hand, the operation of a user is facilitated, and on the other hand, the angle deviation caused by the active adjustment of the angle of the first light source 4 by the user is avoided, so that the detection effect is prevented from being influenced.
Note that each pair of first light sources 4 corresponds to one kind of second inclination angle, and when the ink consistency detection device is used, only one pair of first light sources 4 may be used.
Preferably, the first inclination angle is 45 °, and other angles may be selected according to actual requirements.
Specifically, the calibration plate 1 has a diffuse reflection characteristic and a color characteristic.
It should be noted that, through the technical scheme of the embodiment of the application, the method and the device can be used for real-time online detection, improve the detection efficiency, and replace the artificial visual effect with the image acquired by the machine device, thereby avoiding subjective judgment and having higher detection stability and accuracy.
In a second aspect, an embodiment of the present application provides an ink consistency detection using method, which is based on the ink consistency detection using apparatus mentioned in the first aspect, and the method includes the following steps:
s1, irradiating the center of the top surface of the calibration board 1 from both sides of the center of the top surface of the calibration board 1 at a second inclination angle with a predetermined pair of first light sources 4 according to a predetermined light intensity;
s2, placing different products 5 to be tested on the calibration board 1 one by one, taking images from the center of the top surface of the calibration board 1 by using a preset first image acquisition device 2, and taking images from the top of the top surface of the calibration board 1 by using a second image acquisition device 3 at a first inclination angle to obtain corresponding image information;
s3, classifying the product 5 to be detected based on the brightness information and the color information of the image information of the product 5 to be detected.
In the embodiment of the application, based on the preset light source and the image acquisition device, the product is subjected to image acquisition, and the image acquisition result is analyzed and compared, so that the ink consistency detection is completed, the error of subjective judgment is effectively avoided, and the detection accuracy is improved.
It should be noted that, the embodiment of the application is based on the diffuse reflection principle, and the brightness and the carried color information of the front-view diffuse reflection light and the brightness and the carried color information of the side-view diffuse reflection light are measured at the same time, so that the ink consistency of the product is accurately detected and sorted, the method can be used for off-line and on-line detection, data support is provided for the production of the product, and valuable process and quality control is efficiently provided for the panel industry.
Specifically, the ink consistency detection device based on the ink consistency detection using method comprises the following steps:
the calibration plate 1 is horizontally arranged and used for containing a product 5 to be tested;
the first image acquisition devices 2 are arranged right above the calibration plate 1 at intervals, and a lens of each first image acquisition device 2 is over against the center of the top surface of the calibration plate 1;
the second image acquisition devices 3 are arranged above the calibration plate 1 at intervals, and the lens of the second image acquisition devices 3 inclines towards the center of the top surface of the calibration plate 1 at a first inclination angle;
at least one pair of first light sources 4, each pair of first light sources 4 being spaced above the calibration plate 1 and symmetrically disposed at both sides of the center of the top surface of the calibration plate 1, the first light sources 4 being configured to obliquely irradiate the center of the top surface of the calibration plate 1 at a second oblique angle according to a predetermined light intensity.
Compared with the traditional technical means, the color and brightness detection values in the embodiment of the application are more accurate, because the surface of the product 5 to be detected is generally coated with glue, the color and brightness of the part of the product 5 to be detected below the glue layer are affected,
when the reflected light is used for extracting the brightness, the light is reflected most on the uppermost glue layer, most of the extracted brightness information belongs to the uppermost layer,
when the diffuse reflection is used for extracting the brightness, brightness information of each part of the glue layer can be collected by the camera, and the brightness is extracted relatively by using the reflected light, so that the extraction structure is more accurate.
In addition, the symmetrical polishing mode in the embodiment of the application can enable the detected image to be more uniform, and the accuracy of data can be improved.
Preferably, the first image acquisition device 2 comprises an area array color camera and/or an area array colorimeter;
the second image acquisition device 3 comprises an area array color camera and/or an area array colorimeter.
It should be noted that the area-array color camera or the area-array colorimeter is selected according to actual situations, and the area-array color camera and the area-array colorimeter are distinguished in that:
the color camera acquires RGB data, needs to be formatted,
the data output by the colorimeter are x, y and lv, x and y are color information, and lv is luminance information, so that format conversion is not required if the colorimeter is used.
Specifically, the range value of the first inclination angle is 30-60 degrees;
preferably, the optimal angle of the first inclination angle is 45 °.
Preferably, the second inclination angle may be 0 °, 30 ° or 60 °, or may be selected from other angles according to actual requirements.
Further, the ink consistency detection means may include at least two pairs of the first light sources 4;
if necessary, the ink consistency detection means may include a plurality of pairs of the first light sources 4;
the ink consistency detection device is configured to obliquely irradiate the center of the top surface of the calibration plate 1 with a pair of the first light sources 4 corresponding to the second inclination angle corresponding to a preset irradiation angle requirement.
During actual use, the ink consistency detection device comprises a plurality of pairs of first light sources 4, wherein each pair of first light sources 4 is respectively provided with a second inclination angle corresponding to the first light source 4;
when the calibration plate is used, the irradiation angle requirement is firstly acquired, a pair of first light sources 4 corresponding to the second inclination angle of the first light sources and the irradiation angle required by the irradiation angle requirement is selected, and the pair of first light sources 4 is used for obliquely irradiating the center of the top surface of the calibration plate 1 according to the second inclination angle of the first light sources.
When a plurality of pairs of first light sources 4 are adopted, each pair of first light sources 4 is configured with a different second inclination angle, so that a user can select the corresponding first light source 4 only when using the light source, and the angle of the first light source 4 is not required to be adjusted;
on the one hand, the operation of a user is facilitated, and on the other hand, the angle deviation caused by the active adjustment of the angle of the first light source 4 by the user is avoided, so that the detection effect is prevented from being influenced.
Note that each pair of first light sources 4 corresponds to one kind of second inclination angle, and when the ink consistency detection device is used, only one pair of first light sources 4 may be used.
Preferably, the first inclination angle is 45 °, and other angles may be selected according to actual requirements.
Specifically, the calibration plate 1 has a diffuse reflection characteristic and a color characteristic.
Through the technical scheme of this application embodiment, can be used for real-time on-line measuring, improve detection efficiency, utilize the image of machine device collection to replace artifical visual effect to avoid subjective judgement, the stability and the accuracy of detection are higher.
It should be noted that, the embodiment of the application is based on the diffuse reflection principle, and the brightness and the carried color information of the front-view diffuse reflection light and the brightness and the carried color information of the side-view diffuse reflection light are measured at the same time, so that the ink consistency of the product is accurately detected and sorted, the method can be used for off-line and on-line detection, data support is provided for the production of the product, and valuable process and quality control is efficiently provided for the panel industry.
Specifically, the image information includes front-view image information and side-view image information;
the front-view image information comprises front-view brightness information and front-view color information;
the side-view image information includes side-view luminance information and side-view color information.
Specifically, step S4 of the ink consistency detection using method, the classifying the product 5 to be detected based on the brightness information and the color information of the image information of the product 5 to be detected includes the following steps:
comparing the brightness information and the color information of the image information of the product 5 to be detected with preset image parameter ranges with different values, and classifying the product 5 to be detected which accords with the same image parameter range into the same class; wherein the content of the first and second substances,
the image parameter ranges include a front brightness range, a front color range, a side brightness range, and a side color range.
Specifically, in step S4 of the ink consistency detection using method, before the step of classifying the product 5 to be detected based on the brightness information and the color information of the image information of the product 5 to be detected, the method further includes the following steps:
and converting the RGB value in the image information into a color mode based on a preset calculation formula.
Further, the ink consistency detection and use method further comprises a parameter calibration process, wherein the parameter calibration process comprises the following steps:
calibrating parameters of the first image acquisition device 2 and the second image acquisition device 3 based on the brightness information and the color information of the image information;
keeping the parameters of the first light source 4, the first image acquisition device 2 and the second image acquisition device 3 unchanged, and taking images of different products 5 to be detected.
Furthermore, the ink consistency detection and use method also comprises a parameter recalibration process, and the parameter recalibration process comprises the following steps
And when the number of the products to be detected 5 which finish image capture exceeds a preset first number, recalibrating the first image acquisition device 2 and the second image acquisition device 3.
Based on the technical scheme of the embodiment of the application, an implementation process in actual operation is provided, and the specific conditions are as follows:
the working process is as follows:
firstly, assembling the device, and setting a second inclination angle of the first light sources 4 arranged in pairs according to the light reflection characteristic of the product 5 to be detected;
certainly, a plurality of pairs of first light sources 4 may be provided, each pair of first light sources 4 is respectively configured with a corresponding second inclination angle, at this time, the apparatus is assembled, a pair of first light sources 4 corresponding to the corresponding second inclination angle is selected according to the light reflection characteristic of the product 5 to be measured and the requirement of the irradiation angle, and the first light sources 4 are used as the irradiation light sources.
Secondly, temporarily not placing the product 5 to be detected on the calibration plate 1, starting the first image acquisition device 2, the second image acquisition device 3 and the first light source 4, acquiring images of the calibration plate 1 with specific diffuse reflection characteristics and specific color characteristics, calibrating the image acquisition parameters of the first image acquisition device 2 and the second image acquisition device 3 by the first light source 4 according to the brightness information and the color information of the images, keeping the setting of the calibrated image acquisition parameters, and forbidding the adjustment of the setting values of the image acquisition parameters in the subsequent image acquisition process;
in order to ensure the service life and trend stability of the light source, the first light source 4 is turned on during image capture, and the first light source 4 is turned off at other times.
And thirdly, placing a product 5 to be detected on the calibration plate 1, starting the first image acquisition device 2, the second image acquisition device 3 and the first light source 4, and taking images of the product 5 to be detected by using the first image acquisition device 2 and the second image acquisition device 3.
Fourthly, calculating to obtain image information of a picture corresponding to the product 5 to be detected according to the data obtained by image capture;
the image information comprises front-view image information and side-view image information;
the front-view image information comprises front-view brightness information and front-view color information;
the side-view image information includes side-view luminance information and side-view color information.
Fifthly, replacing the product 5 to be tested, and repeating the third step and the fourth step;
when the product 5 to be measured is replaced, the replacement can be performed manually or automatically.
Sixthly, after the detection of the products 5 to be detected with the preset first number is completed, repeatedly executing the second step to the fifth step, wherein the key is that the image capturing parameters of the first image acquisition device 2 and the second image acquisition device 3 are corrected, so that the device can run stably for a long time, and the data is accurate; wherein the content of the first and second substances,
the preset first number may be 100.
Seventhly, after the detection of a batch of products 5 to be detected is finished, sorting is carried out according to a sorting rule;
of course, classification may also be performed according to the sorting rule after each detection of one product 5 to be detected is completed.
Specifically, the sorting rule in the technical scheme of the embodiment of the application is as follows:
the sorting rule includes a plurality of image parameter ranges, each of which includes a front-view luminance range, a front-view color range, a side-view luminance range, and a side-view color range, taking one image parameter range as an example, specific examples are as follows:
front brightness range a: front brightness small threshold value < front brightness large threshold value
Front view color range b: front view color small threshold < front view color large threshold
Side-view luminance range c: side-view brightness small threshold < side-view brightness large threshold
Side view color range d: the side-looking color small threshold value is less than the side-looking color and less than the side-looking color large threshold value;
it should be noted that each image parameter range includes a front-view luminance range, a front-view color range, a side-view luminance range, and a side-view color range, that is, each image parameter range includes 8 corresponding threshold values;
when the products 5 to be detected are classified, when the front brightness, the front color, the side brightness and the side color of the products 5 to be detected, which are obtained through detection of the ink consistency detection device, meet a certain image parameter range, the products 5 to be detected are classified as the product classification corresponding to the image parameter range.
It should be noted that, the first image capturing device 2 includes an area array color camera and/or an area array colorimeter;
the second image acquisition device 3 comprises an area array color camera and/or an area array colorimeter;
therefore, the RGB values acquired by the area-array color camera need to be converted into the color mode HSL.
The RGB color scheme is a color standard in the industry, and various colors are obtained by changing three color channels of red R, green G, and blue B and superimposing the three color channels on each other, wherein RGB represents the colors of the three color channels of red, green, and blue;
HSL is a representation of a point in the RGB color mode in a cylindrical coordinate system, Hue, Saturation, and brightness.
Let r, g, b be the red, green and blue coordinates of a certain point color on the sample color image, respectively, and their values are real numbers between 0 and 1 after normalization;
setting max equal to the maximum value of r, g and b, and min equal to the minimum value of r, g and b;
the h, s, l values in the HSL space are calculated in the following way:
wherein h is a hue angle, s is saturation, and l is brightness;
the color information is evaluated by the hue angle h, and the brightness information is evaluated by the brightness l.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An ink consistency detection apparatus, characterized in that the apparatus comprises:
the calibration plate (1) is horizontally arranged and is used for containing a product (5) to be tested;
the first image acquisition devices (2) are arranged right above the calibration plate (1) at intervals, and a lens of each first image acquisition device (2) is over against the center of the top surface of the calibration plate (1);
the second image acquisition devices (3) are arranged above the calibration plate (1) at intervals, and lenses of the second image acquisition devices (3) are inclined towards the center of the top surface of the calibration plate (1) at a first inclination angle;
at least one pair of first light sources (4), wherein each pair of first light sources (4) is arranged above the calibration plate (1) at intervals and symmetrically arranged on two sides of the center of the top surface of the calibration plate (1), and the first light sources (4) are configured to obliquely irradiate the center of the top surface of the calibration plate (1) at a second inclination angle according to preset light intensity; wherein the content of the first and second substances,
the calibration plate (1) has diffuse reflection characteristics and color characteristics.
2. The ink consistency detection apparatus according to claim 1, characterized in that:
the first image acquisition device (2) comprises an area array color camera and/or an area array colorimeter;
the second image acquisition device (3) comprises an area array color camera and/or an area array colorimeter.
3. The ink consistency detection apparatus according to claim 1, characterized in that:
the range value of the first inclination angle is 30-60 degrees.
4. The ink consistency detection apparatus according to claim 1, characterized in that:
said device comprising at least two pairs of said first light sources (4),
the second inclination angles corresponding to each pair of the first light sources (4) are different from each other;
the device is configured to obliquely illuminate the center of the top surface of the calibration plate (1) with a pair of the first light sources (4) corresponding to the second inclination angle corresponding to a preset illumination angle requirement.
5. An ink consistency detection and use method is characterized by comprising the following steps:
utilizing a preset pair of first light sources (4) to irradiate the center of the top surface of the calibration plate (1) from two sides of the center of the top surface of the calibration plate (1) at a second inclination angle according to preset light intensity;
placing different products (5) to be measured on the calibration plate (1) one by one, taking images from the position right above the center of the top surface of the calibration plate (1) by using a preset first image acquisition device (2), and taking images from the position above the top surface of the calibration plate (1) by using a second image acquisition device (3) at a first inclination angle to obtain corresponding image information;
classifying the product (5) to be tested based on the brightness information and the color information of the image information of the product (5) to be tested; wherein the content of the first and second substances,
the calibration plate (1) has diffuse reflection characteristics and color characteristics.
6. The ink consistency detection use method as claimed in claim 5, wherein:
the image information comprises front-view image information and side-view image information;
the front-view image information comprises front-view brightness information and front-view color information;
the side-view image information includes side-view luminance information and side-view color information.
7. The ink consistency detection using method as claimed in claim 6, wherein the classifying the product (5) to be detected based on the brightness information and the color information of the image information of the product (5) to be detected comprises the following steps:
comparing the brightness information and the color information of the image information of the product (5) to be detected with preset image parameter ranges with different values, and classifying the products (5) to be detected which accord with the same image parameter range into the same class; wherein the content of the first and second substances,
the image parameter ranges include a front brightness range, a front color range, a side brightness range, and a side color range.
8. The method for use in ink color consistency testing according to claim 5, further comprising the steps of:
calibrating parameters of the first image acquisition device (2) and the second image acquisition device (3) based on brightness information and color information of the image information;
keeping the parameters of the first light source (4), the first image acquisition device (2) and the second image acquisition device (3) unchanged, and taking images of different products to be detected (5).
9. The method for use in ink color consistency testing according to claim 8, further comprising the steps of:
when the number of the products to be detected (5) which finish image capture exceeds a preset first number, the first image acquisition device (2) and the second image acquisition device (3) are recalibrated.
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