KR102485945B1 - Inspecting method the color quality of prints - Google Patents

Abstract

In the present invention, the proofing sheet S includes first to m proofing sheet color gamuts Sj (j is a natural number of 1 or more and m or less), and the first to nth light sources 120 are located at different positions and take pictures. RGB values of the first to nth images (n is a natural number greater than or equal to 2) generated by photographing the proof sheet S using the colorimetric device 100 equipped with the device 110, and the first to mth images A method for determining the color quality of a printed matter by learning a reflectance value previously determined in a color gamut (Sj) of proofing paper.

Description

Inspecting method the color quality of prints}

The present invention relates to a method for inspecting color quality of printed materials.

The printing device mainly performs printing using a roller. When using a roller, the thickness of the ink to be printed varies depending on the position of the roller, and it is necessary to determine whether the color of the printed product corresponds to the color requested by the customer. should be inspected Prints are mass-produced, and it is necessary to inspect mass-produced prints, so reducing the time required to inspect prints is an important issue.

Conventionally, the color of printed matter was inspected using equipment such as a colorimeter. However, equipment such as a colorimeter can inspect a spot unit or a part of a print, so there is a problem in that it takes a lot of time to inspect the print.

In addition, in the related art, there has been a perception of inspecting the color of a printed matter by inputting the printed matter into a colorimeter. However, such a colorimetry device directly measures the reflectance of a plurality of printed materials and inspects the printed materials, so there is a problem in that it takes a lot of time to inspect the printed materials.

For example, Japanese Unexamined Patent Publication No. 2018-196975 relates to a printing device and a printing device control method. When a printed matter is put into the printing device, a light source is irradiated and the reflectance when the light source is irradiated is measured to determine the quality of the printed matter. measure color However, according to this method, there is a problem in that it takes a lot of time to inspect the printed matter.

For another example, Korean Registered Patent Publication No. 10-0326861 relates to a color characteristic measuring device, a color characteristic measuring method, and a storage medium of imaging data, and a printed matter inserted by measuring the reflectance when a light source is irradiated and the light source is irradiated. measure the color of However, according to this method, there is a problem in that it takes a lot of time to inspect the printed matter.

(Patent Document 1) Japanese Unexamined Patent Publication No. 2018-196975

(Patent Document 2) Korea Patent Registration No. 10-0326861

(Patent Document 3) Japanese Unexamined Patent Publication No. 3102848

The present invention has been made to solve the above problems.

Specifically, the control unit can quickly determine the reflectance value and Lab coordinates of the printed matter based on the image of the printed matter taken by the colorimetric device, so that the color quality of the printed matter can be quickly inspected.

In addition, the present invention is for the control unit to learn the RGB values and the reflectance value of the image captured by the photographing device.

In addition, the present invention is provided with a plurality of light sources in the colorimetric device, alternately turning on and off one of the plurality of light sources, to acquire images at various angles and luminous intensities, and for the control unit to learn with the acquired images. to be.

In one embodiment of the present invention for solving the above problems, the proof sheet S includes the first to m proof sheet color gamuts Sj (j is a natural number of 1 or more and m or less), respectively, at different positions. RGB values of the first to nth images generated by photographing the proof sheet S using the colorimeter 100 provided with the first to nth light sources 120 and the photographing device 110, and ( n is a natural number of 2 or more), a method for determining the color quality of a printed matter by learning predetermined reflectance values in the first to m proofing paper color gamuts (Sj), wherein (a) the proofing sheet (S) is inputting the first to nth light sources 120 into the colorimetric device 100; (b) The controller 200 turns on any one of the first to n-th light sources 120, and when any one of the first to n-th light sources 120 is turned on, the photographing device 110 captures the proofing sheet S to generate any one of the first to nth images, and when the photographing device 110 captures the proofing sheet S, any one of the first to nth light sources 120 controlling one to be turned off; (c) generating, by the control unit 200, all of the first to n-th images by repeatedly performing the step (b) with respect to any other one of the first to n-th light sources 120; (d) transmitting, by the photographing device 110, the generated first through n-th images to the controller 200; (e) The control unit 200 classifies each of the first to n-th images so as to correspond to the first to m-th proof sheet color gamuts Sj, so that a plurality of image color gamuts Aik (i is 1 a natural number greater than or equal to m, where k is a natural number greater than or equal to 1 and less than or equal to n), and the controller 200 checking RGB values for each image color gamut (Aik); (f) grouping, by the control unit 200, the image color gamut Aik based on i-value; and (g) the control unit 200 determines in advance the RGB values identified in the grouped image color gamut Aik and the color gamut Si where j is i among the first to m proofing paper color gamuts Sj. Learning the determined reflectance value, repeatedly learning when i is from 1 to m, learning the RGB value as an input value, and learning the reflectance value as an output value; Including, it provides a method.

In one embodiment, after the step (g), (h) another proof sheet (S) is put into the colorimetry device 110, and steps (a) to (g) are repeatedly performed to obtain the control unit 200. is being learned; and (i) when a printed matter is put into the colorimeter 100, the photographing device 110 photographs the printed matter to generate printed matter image information, and the controller 200 determines RGB values from the printed matter image information. and outputting a reflectance value corresponding to the determined RGB value using the model learned in step (g); may further include.

In one embodiment, after the step (i), (j) the controller 200, if the difference between the reflectance value output in the step (i) and the reflectance value requested for the printed matter is within a preset range, the ( determining that the printed matter input in step i) is normal, and additionally learning the printed matter image information; may further include.

In one embodiment, after the step (i), (k) the controller 200, if the difference between the reflectance value output in the step (i) and the requested reflectance value is outside the preset range, the step (i) Determining the input printed matter in the defective; may further include.

In one embodiment, after the step (g), (l) the control unit 200 further checks Lab coordinate values in the image color gamut Aik, and the control unit 200 further checks the image color gamut Aik. Learning the RGB values in ) as input values and the reflectance values and the Lab coordinate values as output values; and (m) inputting another proof sheet S into the colorimeter 110 and repeating steps (a) to (l) so that the control unit 200 learns. .

Another embodiment according to the present invention is a colorimetric device to which the above method is applied, wherein n is 4, and the first to fourth light sources 120 are located at ends of the inner upper surface of the colorimetric device 100, respectively. In the colorimetric device 100, the photographing device 110 is located at the center of the inner upper surface of the colorimetric device 100, and the proof sheet S is delivered to the colorimetric device 100 through a conveyor belt. , a colorimetry instrument is provided.

According to the present invention, the following effects are achieved.

According to the present invention, since the control unit can quickly determine the reflectance value and Lab coordinates of a printed matter only with the photographed image of the printed matter, the color quality of the printed matter can be quickly inspected without a separate inspection process.

In addition, according to the present invention, the control unit can learn RGB values and reflectance values of an image captured by the photographing device.

In addition, in the present invention, a colorimetric device is provided with a plurality of light sources, and one of the plurality of light sources is alternately turned on and off, and images can be obtained at various angles and luminous intensities, and the controller can learn from the acquired images. there is.

1 is a schematic diagram for explaining a method according to the present invention.
2 is a diagram for illustratively explaining a colorimetric device according to the present invention according to the present invention.
3 is a flowchart illustrating a process of generating first through nth images according to the present invention.
4 is a view showing an example of a proof sheet according to the present invention.
5 is a diagram for explaining the classification of color gamuts according to the present invention.
6 is a flowchart illustrating a process of learning using first to nth images and reflectance values generated according to the present invention.
7 is a diagram for illustratively explaining the learning of RGB values and reflectance values according to the present invention.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form centering on core functions of each structure and device.

In addition, in describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the embodiment of the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, "RGB" values are red, green, and blue. Alternatively, the color is defined by specifying percentages of red, green, and blue, and the image contains "RGB" values. "RGB" values can be converted into "Lab coordinates" to be described later, and since this is a well-known technique, description of the conversion method will be omitted.

Hereinafter, "Lab coordinates" means color coordinates, where L is the lightness, a is the degree of red and green, and b is a three-dimensional coordinate representing the degree of yellow and blue. If L* = 0, it is black, and if L* = 100, it is white. If a* is negative, the color leans toward green, and if it is positive, it leans toward red and purple. If b* is negative, it is blue, and if b* is positive, it is yellow.

Hereinafter, "correction paper S" means a sample paper including a plurality of color gamuts in advance to teach the control unit 200.

According to the present invention, a method for learning RGB values of an image generated by photographing a proof sheet S and a reflectance value predetermined in the first to m proof sheet color gamuts Sj includes a colorimetry device 100 and a control unit 200. ).

Referring to FIG. 1, components for performing the method according to the present invention will be described, and referring to FIG. 2, the structure of the colorimetric device 100 according to the present invention will be described.

The colorimetric device 100 is a device for inspecting color by inserting a proof sheet (S) and printed matter therein.

The colorimeter 100 includes a photographing device 110 and a light source 120 .

The photographing device 110 is located on one side of the colorimetry device 100 .

The photographing device 110 may be located at the center of the inner upper surface of the colorimetric device 100, but is not limited thereto.

In addition, a plurality of photographing devices 110 may be positioned, and the same number of first through nth light sources 120 described later may be positioned. At this time, the photographing device 110 may be located at the same location as the first to nth light sources 120 to be described later. That is, the light source 120 and the photographing device 110 may be formed as a single product. In this case, when any one of the first to n-th light sources 120 is turned on, the proof sheet S can be photographed by the photographing device 110 located at the same location as any one of the first to n-th light sources 120. . However, when a plurality of photographing devices 110 are positioned, control of the photographing apparatus 110 is not limited thereto.

When any one of the first to nth light sources 120 to be described later turns on, the photographing device 110 photographs the proofing sheet S and printed matter put into the colorimeter 100 to generate first to nth images. can A detailed description of this will be given later.

At this time, the photographing device 110 may be a camera or a photographing sensor, but is not limited to any device capable of photographing.

The proof sheet S includes first to m proof sheet color gamuts Sj (s is a natural number between 1 and m).

In this case, the color gamut Sj of the proofing sheet S means an area in which the color and position of the proofing sheet S are distinguished, and means that the proofing sheet S includes m positions and colors classified as m.

Reflectance values of the first to m proofing paper color gamuts Sj are measured in advance.

At this time, the reflectance value means the reflectance of reflected light when a plurality of wavelengths are irradiated on paper such as the proofing paper (S) or printed matter. The reflectance value is a value that varies depending on the color of the proofing sheet S and printed matter, and conversely, if the reflectance value is known, the color at that time can be estimated.

When the photographing device 110 photographs the proofing sheet S to generate first through nth images, the first through nth images are respectively expressed in the first through mth proofing paper color gamuts Sj (where j is greater than 1 and less than m). natural number) and the respective image color gamuts of the first to nth images are distinguished. A detailed description of this will be given later.

The light source 120 includes first to nth light sources 120 (where n is a natural number equal to or greater than 2), and the first to nth light sources 120 are located at different positions.

For example, referring to FIG. 2, n is 4. The first to fourth light sources 120 may be respectively positioned at corners of an inner upper surface of the colorimetric device 100 . 2(b) shows a surface of the colorimetric device 100 where the photographing device 110 and the light source 120 are located, but the positions, shapes, and structures of the photographing device 110 and the light source 120 are shown respectively. It is not limited to bars.

The photographing device 110 may take a picture of the proof sheet S when any one of the first to nth light sources 120 is turned on, and check the RGB values of the proof sheet S that vary depending on the position of the light source 120. . This will be described later.

In this case, the first to nth light sources 120 may be LED lights, but are not limited thereto.

In addition, the luminous intensity of each of the first to nth light sources 120 may be adjusted. Accordingly, different images may be created by adjusting the light intensity even from the light source 120 at the same location. A detailed description of this will be given later.

At this time, the light source 120 may be an LED, but is not limited thereto, and is not limited to a specific type.

In addition, since the colorimetric device 100 may be connected to a conveyor belt, the proofing sheet S may be automatically introduced along the conveyor belt, but is not limited thereto.

The control unit 200 receives first through nth images captured by the photographing device 110 .

The controller 200 separates the first to nth images to correspond to the first to mth color gamuts Sj, respectively, so that a plurality of image color gamuts Aik (k is a natural number of 1 or more and n or less, i is a natural number between 1 and m).

For example, when the controller 200 is the first image, the k value is 1, and the first image includes the image color gamut A11 and the image color gamut A21. At this time, the image color gamut A11 is an area located at a position corresponding to the first proof sheet color gamut S1.

Thereafter, the control unit 200 groups the image color gamut (Aik) based on the i value, and the control unit 200 determines the RGB values identified in the grouped image color gamut (Aik), and the first to m proofing paper color gamuts. In (Sj), it may be learned using a reflectance value determined in advance. Through this, the control unit 200 can predict the reflectance value and inspect the color quality of the printed material when the printed material is loaded. A detailed description of this will be given later.

The controller 200 may be located inside the colorimetric device 100, but is not limited thereto.

In this case, the image color gamuts Aik divided from the first to nth images may include different RGB values.

Referring to FIG. 3, a process of generating first through n-th images according to the present invention will be described in detail.

The proofing sheet S is put into the colorimetric device 100 where the first to nth light sources 120 (n is a natural number greater than or equal to 2) are installed.

When the controller 200 turns on any one of the first to nth light sources 120, the photographing device 110 photographs the proofing sheet S to generate an image. That is, an image is taken when any one of the first to nth light sources 120 is turned on.

When the photographing device 110 photographs the proof sheet S, the controller 200 controls one of the first to nth light sources 120 to be turned off.

The controller 200 repeatedly performs the above process for any one of the first to nth light sources 120 to generate all of the first to nth images.

For example, the controller 200 turns on the first light source 120, and the photographing device 110 photographs the proofing sheet S to generate a first image. After that, the first light source 120 is turned off. When the first light source 120 is turned off, the controller 200 turns on the second light source 120, and the photographing device 110 photographs the proofing sheet S to generate a second image. After that, the second light source 120 is turned off. By repeatedly performing this process, the photographing device 110 may generate first through n-th images.

That is, the first to nth images are generated when each of the first to nth light sources 120 is turned on.

The photographing device 110 transmits the generated first through nth images to the controller 200 .

At this time, the first to nth light sources 120 may be sequentially turned on under the control of the control unit 200, and may be turned off under the control of the control unit 200 when the photographing device 110 is operated, but is limited thereto. it is not going to be For example, the first to nth light sources 120 may be set to be automatically turned off after being turned on for a predetermined time under the control of the controller 200 .

With reference to FIGS. 4 and 5 , the classification of color gamuts in the first to n th images will be described.

4 exemplarily shows a proofing sheet S according to the present invention. At this time, the number of color gamuts included in the proofing sheet S shown in FIG. 4 is an example and is not limited thereto.

The proofing sheet S includes first through mth proofing sheet color gamuts Sj.

In this case, the first to m proofing paper color gamuts Sj may include different RGB values, but are not limited thereto.

In addition, the controller 200 stores reflectance values in the first to m proofing sheet color regions Sj of the proofing sheet S in advance.

Referring to FIG. 5 , it will be described that the first to m th proof sheet color gamuts Sj of the proof sheet S correspond to the image color gamuts Aik of the first to n th images.

The controller 200 divides the first to nth images to correspond to the first to mth color gamuts Sj, respectively, so that a plurality of image color gamuts Aik (i is a natural number of 1 or more and m or less, k is a natural number between 1 and less than n).

For example, when the first to m th color gamuts Sj are m=30, the first to n th images include the image color gamut Aik of m=30. This is shown in FIG. 5 .

Also, for example, if k is 1 and m is 4, the first proof sheet color gamut (S1), the second proof sheet color gamut (S2), the third proof sheet color gamut (S3), and the fourth proof sheet color gamut (S4) It is divided into an image color gamut (A11), an image color gamut (A21), an image color gamut (A31), and an image color gamut (A41) that are divided in the corresponding first image.

Since the first to nth images are all information obtained by photographing the proofing sheet S, the image color gamut Aik can be distinguished to correspond to the first to mth proofing paper color gamuts Sj included in the proofing sheet S. can

At this time, the image color gamut Aik may be divided into image color gamuts Aik so that positions correspond to the first to m proofing paper color gamuts Sj. The image color gamut A11 and the image color gamut A12 may each correspond to the position of the first proofing paper color gamut S1. Alternatively, the image color gamut (Aik) has been described as corresponding to the first to m proofing paper color gamuts (Sj) in position, but is not limited thereto and may be determined to correspond based on the fact that the color is within a preset range. and it may be determined that they correspond in consideration of both location and color.

Referring to FIGS. 6 and 7 , a process in which the controller 200 learns using RGB values and reflectance values included in the first through n-th images will be described.

The controller 200 groups the image color gamut Aik based on the value i.

For example, the controller 200 groups the image color gamut A11, the image color gamut A12, the image color gamut A13, etc., in which i is all 1, into the same group.

The controller 200 learns the RGB values identified in the grouped image color gamut Aik and the reflectance value predetermined in the color gamut Si where j is i among the first to m proofing paper color gamuts Sj. However, learning is repeated from 1 to m.

That is, the control unit 200 learns the RGB values of the image color gamut Aik grouped on the basis of the i value and the reflectance value predetermined in the color gamut Si at this time.

At this time, the control unit 200 learns by using the RGB values as input values and the reflectance values as output values. However, the learning method is not limited to a specific method.

In addition, another proof sheet S is put into the colorimeter 110, and the above process is repeatedly performed so that the control unit 200 can learn more.

At this time, the reflectance value of one or more of the color gamuts included in the other proofing sheet S may be different from the reflectance value of the already learned color gamut of the proofing sheet S.

Through this, the present invention can learn by reflecting the fact that the color changes according to the angle and luminous intensity of the light source 120 even if the color of the proof sheet color gamut Si included in the same proof sheet S is reflected.

As described above, the proofing sheet S is put into the colorimetric device 100 and taken, and the first to nth images that vary according to the angle and luminous intensity of the light source 120 may be generated, and the control unit 200 may generate the proofing sheet S ) Classifies the image color gamut (Aik) in each of the first to n th images corresponding to the first to m proofing paper color gamuts (Sj) included, and groups the image color gamuts (Aik) based on i value. and learning the reflectance value in the color gamut (Si) of the proofing paper at that time was explained. Accordingly, in the present invention, it is possible to learn by reflecting the fact that colors are measured differently according to the angle and luminous intensity of the light source 120 .

Through this, the control unit 200, when a printed matter is put into the colorimetry device 100, the photographing device 110 photographs the printed matter to generate printed matter image information, and the control unit 200 determines RGB values from the printed matter image information, , a reflectance value corresponding to an RGB value determined using the learned model may be output. At this time, in the present invention, the color of the printed matter can be inspected while controlling the lighting of the light source 120, so the color of the printed matter can be more accurately inspected without being affected by the angle and light intensity of the light source 120.

At this time, printed matter refers to paper output from a printing press and put into the colorimeter 100 to inspect color.

In addition, the control unit 200 may additionally learn Lab coordinate values.

At this time, the Lab coordinate value means a value obtained by converting the averaged RGB value by averaging the RGB values included in the image color gamut (Aik) grouped based on the i value, but is not limited thereto. Alternatively, the Lab coordinate values may refer to values previously confirmed in the color gamut Sj of the proofing sheet.

The control unit 200 learns using RGB values as input values and reflectance values and Lab coordinate values as output values, but is not limited thereto and the learning method is not limited to a specific method.

For example, see FIG. 7 . At this time, it is assumed that n is 4 and m is 3. The control unit 200 sets the RGB values checked in the image color gamut A11, the image color gamut A12, the image color gamut A13, and the image color gamut A14 as input values, and calculates the reflectance value and the LAB coordinates at this time. The value is used as an output value and learned, and the color gamut at other locations is also learned through the same process.

A method of inspecting a printed matter after the control unit 200 learns will be described.

When a printed matter is loaded into the colorimetric device 100, the photographing device 110 photographs the printed matter to generate printed matter image information.

The control unit 200 determines RGB values from printed image information, and outputs reflectance values and Lab coordinate values corresponding to the determined RGB values.

If the difference between the output reflectance value and the Lab coordinate value and the requested reflectance value and the Lab coordinate value are within a predetermined range, the control unit 200 determines that the print is normal. In addition, the control unit 200 may additionally learn printed image information of the loaded printed matter.

At this time, the requested reflectance value means a reflectance value previously requested by the customer, and since the color varies according to the reflectance value, requesting the reflectance value means requesting the color quality of the printed matter.

At this time, it has been described that the control unit 200 determines that the printed matter is normal if any one of the difference between the output reflectance value and the requested reflectance value is within a predetermined range, but is not limited thereto. For example, the control unit 200 may determine that the loaded printed matter is normal if the difference between the output reflectance value and the Lab coordinate value and the requested reflectance value and the requested Lab coordinate value are both within a preset range.

In addition, if the difference between the output reflectance value and the requested reflectance value and the Lab coordinate value is out of a predetermined range, the controller 200 determines that the loaded printed matter is defective.

In the above, the present specification has been described with reference to the embodiments shown in the drawings so that those skilled in the art can easily understand and reproduce the present invention, but this is only exemplary, and those skilled in the art can make various modifications and equivalents from the embodiments of the present invention. It will be appreciated that embodiments are possible. Therefore, the scope of protection of the present invention should be defined by the claims.

100: colorimetric device
110: photographing device
120: light source
200: control unit
S: proof sheet
Sj: color gamut of proofing paper
Aik: image gamut

Claims (6)

The proof sheet S includes first to m proof sheet color gamuts Sj (j is a natural number of 1 or more and m or less), and is positioned at different positions to irradiate light at different angles to the proof sheet S RGB values of the first to nth images generated by photographing the proof sheet S using the colorimeter 100 equipped with the first to nth light sources 120 and the photographing device 110 (n is A natural number of 2 or more), a method for determining the color quality of a printed material by learning a reflectance value predetermined for each of the first to m proofing paper color gamuts (Sj),
(a) putting the proof sheet S into the colorimetric device 100 equipped with the first to nth light sources 120;
(b) The controller 200 turns on any one of the first to n-th light sources 120, and when any one of the first to n-th light sources 120 is turned on, the photographing device 110 captures the proofing sheet S to generate any one of the first to nth images, and when the photographing device 110 captures the proofing sheet S, any one of the first to nth light sources 120 controlling one to turn off;
(c) generating, by the control unit 200, all of the first to n-th images by repeatedly performing the step (b) with respect to any other one of the first to n-th light sources 120;
(d) transmitting, by the photographing device 110, the generated first through n-th images to the controller 200;
(e) The control unit 200 classifies each of the first to n-th images so as to correspond to the first to m-th proof sheet color gamuts Sj, so that a plurality of image color gamuts Aik (i is 1 a natural number greater than or equal to m, where k is a natural number greater than or equal to 1 and less than or equal to n), and the controller 200 checking RGB values for each image color gamut (Aik);
(f) grouping, by the control unit 200, the image color gamut Aik based on i-value; and
(g) The control unit 200 controls the plurality of RGB values identified in the grouped image color gamut Aik and the color gamut Si where j is i among the first to m proofing paper color gamuts Sj. Learning a predetermined reflectance value, repeatedly learning when i is from 1 to m, and learning using the plurality of RGB values as input values and the reflectance values as output values; including,
After the step (g),
(h) inputting another proof sheet (S) to the colorimeter 110 and repeating steps (a) to (g) to learn the controller 200; and
(i) When a printed matter is put into the colorimeter 100 and any one of the first to nth light sources 120 is turned on by the photographing device 110, the photographing device 110 photographs the printed matter Print image information is generated, and the control unit 200 determines a plurality of RGB values from the print image information, inputs the determined plurality of RGB values to the model learned in the step (g), and outputs a reflectance value. step of becoming; Including more,
Way.
delete According to claim 1,
After step (i),
(j) the control unit 200 determines that the printed matter inserted in step (i) is normal if the difference between the reflectance value output in step (i) and the reflectance value requested for the printed matter is within a preset range, additionally learning the print image information; Including more,
Way.
According to claim 1,
After step (i),
(k) if the difference between the reflectance value output in the step (i) and the requested reflectance value is outside a predetermined range, the control unit 200 determining that the printed matter inserted in the step (i) is defective; Including more,
Way.
According to claim 1,
After the step (g),
(l) the controller 200 further checks Lab coordinate values in the image color gamut Aik, the controller 200 sets the RGB values in the image color gamut Aik as input values, learning the reflectance value and the Lab coordinate value as output values; and
(m) inputting another proof sheet (S) to the colorimeter 110 and repeating steps (a) to (m) so that the control unit 200 learns;
Way.
As a colorimetric device to which the method according to claim 1 is applied,
n is 4, and the first to fourth light sources 120 are located at the ends of the inner upper surface of the colorimetric device 100, respectively.
The colorimetric device 100,
The photographing device 110 is located at the center of the inner upper surface of the colorimetric device 100.
The proofing sheet (S) is transferred to the colorimetric device 100 through a conveyor belt,
colorimetric device.

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