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Detection control method used in printing color

A technology for detection control and color, applied in the direction of electrical program control, color measurement device, program control in sequence/logic controllers, etc.

Inactive Publication Date: 2009-12-16
海安运城制版有限公司
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Problems solved by technology

[0004] The object of the present invention is to address the deficiencies in the prior art and provide a color detection and control method for color printing, which can not only accurately measure the color characteristics, but also guide the printing process of yellow, magenta, Adjust the amount of ink in the four colors of cyan and black, which solves the problem of effective and reliable monitoring of the color reproduction effect in the field of color printing

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  • Detection control method used in printing color
  • Detection control method used in printing color
  • Detection control method used in printing color

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Embodiment Construction

[0044] The specific steps of the method for detecting the color printing color are:

[0045] Step (1) adopting CCD industrial color camera acquisition equipment to obtain the RGB value of printed matter color information;

[0046] Step (2) Convert RGB values ​​to CIEL * a * b * Space corresponding to L * a * b * value, specifically:

[0047] First convert the RGB value to the XYZ value of the XYZ color space, the conversion formula is:

[0048] X=a 11 R+a 12 G+a 13 B

[0049] Y=a 21 R+a 22 G+a 23 B (a)

[0050] Z=a 31 R+a 32 G+a 33 B

[0051] In the formula, a 11 、a 12 、a 13 、a 21 、a 22 、a 23 、a 31 、a 32 、a 33 It is the characteristic parameter of CCD industrial color camera;

[0052] Then, convert the XYZ values ​​to CIEL again * a * b * Space corresponding to L * a * b * value, the conversion formula is:

[0053]

[0054] a * =500[(X / X n ) 1 / 3 -(Y / Y n ) 1 / 3 ] (b)

[0055] b * =200[(Y / Y n ) 1 / 3 -(Z / Z n ) 1 / 3 ]

[0056] In the ...

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Abstract

The invention relates to a detection control method used in printing color, and aims to overcome the disadvantage that the prior printing reproduction effect detection method has limited analysis and measuring capabilities. The detection control method comprises the following steps: firstly, adopting CCD industrial color camera collection equipment to obtain a presswork color information RGB value; secondly, converting the RGB value into an Lab value corresponding to a CIELab space, and adopting a least square support vector machine method to realize transformation modeling from an Lab space to a CYMK space; converting the Lab value of a to-be-detected sample into a CYMK value of the CYMK space by a trained model to obtain the ink value of a corresponding ink area of a color presswork; and finally, comparing the ink amount value with a standard value to obtain an adjustment amount of the ink amount in the corresponding ink area. The detection control method not only measures color characteristics accurately, but also directs the adjustment in the amount of yellow, fuchsine, cyan and black ink during the printing, thereby solving the problem of effective and realizable monitoring of color reproduction effect in the color printing field.

Description

technical field [0001] The invention belongs to the technical field of printing, and in particular relates to a method for detecting printing colors. Background technique [0002] As a printing and reproduction process, what is pursued is "faithful reproduction" of the original manuscript. Therefore, how to accurately detect the printing reproduction effect and adjust the printing process in time is a key technology in the field of printing production. [0003] At present, the detection methods of printing reproduction effect mainly include density detection method and chromaticity detection method. The density method can only obtain the relative amount of a certain primary color ink in printing, and cannot indicate the hue of the measured color. Its analysis and measurement capabilities are limited. At the same time, the density method cannot be compared with CIE in some form. * associated with the colorimetric system, while the CIE * The color system is a recognized col...

Claims

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Application Information

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IPC IPC(8): G05B19/04G01J3/46
Inventor 管力明林剑何宏陈梅胡更生
Owner 海安运城制版有限公司
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