High-power image dot coverage rate digital measuring method suitable for whole printing process

A technology of dot coverage and measurement method, which is applied in the field of digital measurement of dot coverage of high-magnification images, and can solve the problems of inaccuracy, affecting the accuracy of measurement values, too large or too small per unit area, etc.

Active Publication Date: 2015-07-01
周广伟
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the dot image obtained is either blurred, or the unit area is too large or too small, which directly affects the accuracy of the measured value
In short, even if a l

Method used

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  • High-power image dot coverage rate digital measuring method suitable for whole printing process
  • High-power image dot coverage rate digital measuring method suitable for whole printing process
  • High-power image dot coverage rate digital measuring method suitable for whole printing process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1: preferably use 300 times of 0.001 mm precision high-magnification magnifying glass, first measure the dot pitch to determine the number of screen lines, then measure the diameter of the dots, and compare the diameter and dot percentage value corresponding to the number of screen lines to obtain the dot percentage value.

[0064] In the foregoing, as attached figure 2 As shown, taking the 175 line as an example, the amplitude modulation square and the dots are used to determine the data of the 175 line using a 0.145mm dot pitch; according to the RIP principle and the area formula, the 175 line dot 1-78.5% diameter formula is as follows:

[0065] =2r S= r 2 ≈3.14 1 inch =25.4 mm=175 lpi

[0066] = 2

[0067] =2

[0068] =2

[0069] =2

[0070] =2

[0071] in: :diameter S:area r:circle radius n:dot number per unit area m:dot percentage value.

[0072] In the above, if it is not 175 lines, use the formula: network line L=25.4÷dot pi...

Embodiment 2

[0087] Embodiment 2: In the case of dot enlargement, the above-mentioned method is still used for the dot measurement of the small-version copy proofing. When outputting a large format, there will be dot gain, and the dot gain is complicated. Before the matching correction "reduction" data is obtained, the existing technology usually uses the method of printing and adding time to ensure the printing of large format dots. CTP To add the corresponding curve to solve.

[0088] In the foregoing, there are two cases of network expansion:

[0089] 50% dots 150 lines 175 lines 200 lines Diameter (mm) 0.135 0.116 0.100 perimeter 0.424 0.364 0.314 Area (mm2) 0.0143 0.0106 0.0079 Area enlarged by 0.01mm 0.0189 0.0145 0.0113 Dot gain value (%) 32% 37% 43%

[0090] 175 line dots 25% outlets 50% outlets 75% outlets Diameter (mm) 0.082 0.116 0.142 Expanded Diameter (mm) 0.092 0.126 0.152 Expand...

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Abstract

The invention discloses a high-power image dot coverage rate digital measuring method suitable for a whole printing process. The measuring method includes the processes that in the whole printing processes of platemaking, reprinting, filming and the like, a printing image to be measured is selected, screenshot is conducted to obtain color samples by using a high magnified glass, pixel values of the color samples are measured by an image tool software, percentage judgment is conducted by using a general formula, the dot coverage rate is obtained through comparison and correction, the dot coverage rate is measured and corrected reasonably according to a new theory accurately and rapidly, and abnormal reprinting sample making is completed in advance at a time. Dot area rate is measured accurately and rapidly and corrected to replace the coverage rate, errors are corrected automatically, and the accuracy is high. Datamation and automation joint are convenient to conduct. In the printing of a frequency adjustment web and printing dots, edges, shapes and dot spacing are easy to determined, the website of the film or PS edition is clear, the shape is good, and the distinguish accuracy and identification error can be controlled within 1%.

Description

technical field [0001] The invention relates to the measurement technology of IPC classification B41F printing machinery or G01B irregular surface or contour; it belongs to the field of dot quality control in printing technology, especially a digital measurement method for high-magnification image dot coverage in the whole printing process. Background technique [0002] In the process of modern printing operations, the measurement and monitoring program has become an indispensable and important link, and the realization of dataization, standardization and normalization has become the basic premise and guarantee. [0003] "Today's Printing" published a new method of measuring dot coverage in the 03 issue of 1998. It is believed that the color halftone image reproduces the tone and color of the original manuscript by means of a combination of various primary color dots and a known target color scale. From color separation film, plate printing, proofing to printing image, it is...

Claims

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Application Information

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IPC IPC(8): B41F33/00
Inventor 周广伟
Owner 周广伟
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