CN100458423C - Detecting method for color printing quality - Google Patents

Detecting method for color printing quality Download PDF

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CN100458423C
CN100458423C CN 03120817 CN03120817A CN100458423C CN 100458423 C CN100458423 C CN 100458423C CN 03120817 CN03120817 CN 03120817 CN 03120817 A CN03120817 A CN 03120817A CN 100458423 C CN100458423 C CN 100458423C
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color
image
error
printing
sampling
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CN 03120817
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CN1532541A (en )
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周仁忠
屈明生
艺 杨
川 王
王岩松
顾克俭
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中国印钞造币总公司
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Abstract

一种彩色印刷质量检查方法,其特征在于:对彩色印刷的图像按颜色分区后进行采样,并直接对采样图像的色度误差进行检查,采样密度为原始图像的1%-10%。 A color printing quality inspection method, comprising: printing a color image is sampled by the partition color, chroma sampling error and directly check the image, the sampling density of 1% -10% of the original image. 本发明采样后直接对彩色图像的色度误差进行检查,而不是将彩色图像转换为“黑白模型”后再进行色度误差检查,避免了“黑白模型”存在的在间接检查彩色印刷的各种色度误差时对环境非常敏感的严重缺陷。 The present invention is directed to a color image chrominance error checking is performed after sampling, rather than the color image into a "black and white model" chromaticity then checked for errors, to avoid indirect examination of color printing in the presence of "black and white model" various serious defect is very sensitive to the environment when the chroma error. 本发明还提供一种用于检查钞票质量的检查方法,能对钞票质量的所有误差进行检查,且检查的数据大为减少,检查设备简单、检查速度快,无需每日进行三次白平衡校正。 The present invention also provides a quality inspection method for inspecting for banknotes, all the errors can be checked by mass of banknotes, checks and the data greatly reduced, inspection apparatus is simple, fast inspection speed, white balance correction without three times a day.

Description

彩色印刷质量检查方法 Color printing quality inspection method

技术领域 FIELD

本发明涉及一种彩色印刷质量检查方法,特别是适用于检查大张钞票的彩色印刷质量的方法。 The present invention relates to a color printing quality inspection method, particularly to a method for color printing quality inspection of large banknotes. 背景技术 Background technique

彩色印刷文件特别是大张钞票彩色印刷质量的检查方法,决定着检查精度、检查速度和检查设备的复杂程度,是检查设备中的关键技术之一。 Color printing quality color printing papers particularly large bills inspection method determines the inspection accuracy, speed and complexity of the examination of inspection equipment, is one of the key technical inspection equipment. 目前, Currently,

世界上只有瑞士的公司生产出了大张钞票彩色印刷质量检查机Nota Save Check H。 The world's only Swiss company to produce large bills color printing quality inspection machine Nota Save Check H. 但是,这种机器检查用的4全查方法是:通过下式将图像彩色的三刺激值R (红色值)G (绿色值)和B (蓝色值)转换成黑白灰度J值,即 However, such a machine 4 full search method is used to check: converting the color image by the following formula tristimulus values ​​of R (red value) G (green value) and B (blue value) to black and white grayscale value J, i.e.,

J = Kr R + Kg G + Kb B (1 ) J = Kr R + Kg G + Kb B (1)

式中Kr、 Kg和Kb是转换系数,是在大张上分区域分别设定的。 Where Kr, Kg, and Kb is a conversion coefficient, on a large sheet is set in each subregion. 由此,便将彩色图像转换成黑白图像。 Thus, it puts the color image is converted into monochrome image.

上述方法可称之为"黑白才莫型",它的优点是:信息量由2"bit缩小为28bit, 即信息量减少到6万5千分之一,这对于简化系统和加快检查速度无疑是很有意义的。但是,因为丟失了彩色信息,而企图用灰度信息来反映彩色状况是有严重缺陷的,即不能检查出彩色印刷的各种色度误差,更不能检查出彩色印刷的绝对色度误差;另一方面,为了使上述"黑白模型"能部分反应彩色印刷的某种色度误差现象,便需要建立许多实施的检查模型,为此,在检查现场, 需^t时两周以上才能建立起预定的检查算法才莫型;上述"黑白才莫型"还有一 The method described above can be referred to as "black and white only Mo type", its advantages are: the amount of information from the 2 "bit is a 28bit reduced, the amount of information that is one thousandth to 60,005, and simplified system for which speed up the checking doubt that makes sense. However, because color information is lost, while attempting to use the gray color information to reflect the situation is seriously flawed, that error can not check out the wide range of color color printing, but can not check out the color printing absolute colorimetric error; the other hand, in order to make the above-described "black and white model" some error phenomenon can be partially reacted chroma color printing, checking model would require the establishment of many embodiments, for which the inspection site, the time required ^ t two weeks or more in order to establish a predetermined algorithm checks only Mo type; the above "black and white only Mo-type" there is a

个严重缺点,即对使用环境极其敏感,例如,这种"黑白模型"对照明光源和钞票纸的颜色变动就4艮敏感,所以工作中一天至少^^故三次白平衡校正工作。 Serious drawback, i.e., is very sensitive to the environment, e.g., the "black and white model" to 4 Burgundy sensitive color variations of illuminating light source and banknote paper, the working day at least three times so that the white balance correction ^^ work. 发明内容 SUMMARY

本发明解决上述彩色印刷质量检查是通过转换为"黑白模型"后间接检查彩色印刷的色度误差从而存在的对环境非常敏感、不能真实反应彩色印刷质量的缺陷,提供一种能检查彩色印刷的色度误差,数据量又不大,对环境不敏感且所需系统简单、检查速度快的彩色印刷质量检查方法。 The present invention solves the above-described color printing quality inspection by converted to "monochrome model" Indirect after error checking is very sensitive to chrominance color print so that there is the environment, the defect can not truly reflect the quality of color printing, color printing to provide a check of chromaticity error, not a large amount of data, and the system is environmentally insensitive simple, fast inspection speeds desired color print quality inspection method.

本发明的技术解决方案是: Technical solutions of the present invention are:

一种彩色印刷质量冲全查方法,其特征在于:对彩色印刷的图像按颜色分区后进行采样,采样后对采样图像的色度误差直接进行检查,采样密度为原始图像的1%—10%。 A color print quality red full search method, comprising: printing a color image is sampled by the color partition the chroma sampling error is checked directly sampled image sample density of 1% -10% of the original images .

对所述采样图像采用LUV色度模型或LAB色度模型进行检查。 LUV sample images using the colorimetric model or LAB color model checking.

所述采样密度为原始图像的3.5%—4.5%。 The sampling density is 3.5% -4.5% of the original image.

上述LUV为国际通用的色度才莫型检查方法,LUV为均匀颜色空间的三个坐标值,L代表颜色的明度,U、 V两个坐标值代表颜色的色品。 LUV above only internationally accepted colorimetric Mo type inspection method, three coordinate values ​​to LUV color space uniformly, L represents the color lightness, U, V coordinates of two representative color values ​​of chromaticity. 上迷LUV色度模型的公式如下: The above-LUV color model formula is as follows:

丄=116(1)7-16 Shang = 116 (1) 7-16

少0 Less 0

F二13丄(v-v0) 式中: Shang two 13 F (v-v0) where:

(2) (2)

<formula>formula see original document page 4</formula>(3)<formula>formula see original document page 5</formula> <Formula> formula see original document page 4 </ formula> (3) <formula> formula see original document page 5 </ formula>

上述各式中的符号意义如下:(X、 Y、 Z)是理想观察者得到的颜色三剌激值,是从(R、 G、 B)转换过来的;(U、 V)为国际照明工程师协会(C旧) 规定的色品两个坐标符号,而(u。、 v0、 y。)则是(u、 v、 Y)的特定值。 The meanings of symbols in the above formulas are as follows: (X, Y, Z) is a three color stimuli values ​​obtained over the viewer, is the conversion from (R, G, B) over; (U, V) of International Illumination Engineers predetermined Association (C old) chromaticity coordinates of two symbols, and (u., v0, y.) is (u, v, Y) of a specific value.

对钞票中除色度误差以外的其他误差进行检查仍是将彩色印刷图像转变成黑白图像后,再采用逐点法进行检查。 Banknotes other than the color of other error checking error remains after color print image is converted into monochrome image, then check point by point method.

在对钞票质量的检查中,除色度误差以外的其他误差包括印刷误差和纸张误差,印刷误差:如几何尺寸误差、斑块、缺印等瑕疯;纸张误差指纸张本身的缺陷:如水印、安全线缺陷、孔洞等。 Checking the quality of banknotes, in addition to other errors chromaticity error comprises an error and printing paper error, printing error: error such as geometry, patches, and other printing flaws lack mad; paper error is the defect of paper itself: such as watermarks safety line defects, holes and so on.

本发明方法由于直接对彩色印刷的彩色采样图像的色度误差进行检查,而不是将彩色图像转换为"黑白模型"后再进行色度误差检查,避免上述"黑白才莫型"存在的在间接检查彩色印刷的各种色度误差时对环境非常敏感的严重缺陷。 The method of the present invention, since the color samples directly chrominance error image color printing inspection, not the color image is converted to "monochrome model" chromaticity then checked for errors, to avoid the above-described "black and white only Mo type" is present in an indirect very sensitive to the environment serious defects of various error checking chrominance color printing. 另外,本发明方法中由于釆用了对彩色图l象采样的方法,因此能4吏彩色印刷图像处理的数据量大为减少,又由于采样密度为1%—10%,该范围内的采样密度能足以精确^^区域内的平均色度误差,故能检测出各种色度误差,包括现有技术根本不能检测出的绝对色度误差;同时小比例采样检查可使本发明的数据量大为减少,所以检查设备简单、检查速度快。 Further, since the method of the present invention preclude the use of the color image in FIG. L sampling method, the amount of data it is possible to print a color image processing Official 4 is reduced, and because the sampling density of 1% -10%, the samples within this range the average density sufficient to color error within precise ^^ area, it can detect a wide range of color errors, including errors prior art absolute chromaticity can not be detected; the same small amount of data can check the sampling ratio of the present invention greatly reduced, so a simple inspection apparatus, inspection speed fast. 本发明彩色图像除色度误差以外的误差则可以采取常规的检查方法进行检查。 The present invention is a color image other than the color error can be taken to a conventional error check method checks. 附困说明 Description attached trapped

图1是本发明的工作流程框图。 FIG. 1 is a block diagram showing a workflow of the present invention. 具体实施方式 detailed description

实施例1:如图1所示,彩色CCD相机采集到待检查的彩色印刷文件的彩色图像,并且分别输出三刺激色R、 G、 B图像信号。 Example 1: As shown, a color CCD camera to capture color images printed color document to be examined, and outputs the tristimulus R, G, B image signals 1, respectively. 由于光源照明不均匀及彩色CCD相机响应的不均匀,造成图像亮度不均匀,所以JMt此进行图像 Since the light source for illuminating the uneven color CCD camera response and uneven, resulting in uneven image brightness, so this image JMt

非均匀补偿;此外,又由于光源的变化及彩色CCD相扭对RGB颜色响应的差别,故要对彩色CCD相机进行白平衡校正,但这种校正无需一日进行三次, 只要每日进行一次,甚至更少的校正即可。 Non-uniformity compensation; In addition, and because the light source changes the color CCD and the RGB color difference relative torsion response, it is to be a color CCD camera white balance correction, but this correction without three times a day, once a day for as long as, even less can be corrected.

经过白平衡校正后,彩色印刷文件的彩色图像信号分成两路: 一路传至彩色图形采样环节,而另一路则传至彩色图像至H图像变换环节。 After the white balance correction, color printing, a color image signal is divided into two files: one part is transmitted to the sample color graphics, and the other way is transmitted to a color image to the image transform part H.

上述彩色图像的色度检查不是逐点进行的,而是按相同颜色分区再进行采样检测的,采样密度为原始图像的4%左右,因而彩色图〗象处理的数据量大为减少;接着再对彩色图像进行色度LUV检测,便可以准确检测出大张钞票的色度误差。 Chromaticity point by point inspection of the color image is not performed, but the same color and then partitioned sampling detection, sampling density is about 4% of the original image, so that the color image data amount〗 FIG treatment is reduced; followed LUV color image color detection, can accurately detect the color error of large bills. 即由招Hljf几采集到图像各点的(R、 G、 B)值,按公式(4)计算出(X、 Y、 Z)值,下一步便依公式(3)算出(U、 V)值,M则由公式(2) 算出(L、 U、 V)值,得出彩色印刷的色度状况。 I.e., a few strokes Hljf points acquired image (R, G, B) values, (4) calculated according to the formula a (X, Y, Z) values, then the next step according to Equation (3) is calculated (U, V) value M by equation (2) is calculated (L, U, V) values ​​obtained status chrominance color printing.

对上述采样彩色图像还可选用其他的色度才莫型进4亍检查,比如LAB色度模型。 The above-described sampling may also use other color image chromaticity MO intake was checked right foot 4, such as LAB color model.

在彩色图像至M图像的变换环节中,彩色图像也按公式(1)转换成黑白图像,然后对图像的每个点依次分别检查大张钞票图像的几何尺寸误差、斑点疵病、浅印、缺印和纸张缺陷等,即包括彩色色度以外的所有印刷误差的检查。 In the color image converting part to M images, the color image but also according to formula (1) is converted into black and white images, then for each point of the image are sequentially large error checking banknotes geometry image, the spot flaws, light printing, lack of paper and printing defects, i.e., comprising all the check print color other than the color error. 当以上检查完成后,将所有检查结杲均输入至彩色印刷质量分析环节,在此环节中,除对印刷误差进行分析外,也对印刷质量作综合 When the above check is completed, all the check nodes are input to the color printing Gao mass analysis part, in this session, in addition to printing error analysis, but also for print quality for comprehensive

评定。 assessment. 彩色印刷文件的印刷质量经过综合评定之后,便要进行如下控制: ' Printing quality color printing files after a comprehensive evaluation, we have to control the following: '

1、 将好品输入好品仓; 1, the good product good for input bins;

2、 将废品输入废品仓,并发出声光4艮警。 2, the input scrap waste bins, concurrent Gen 4 sound and light alarm.

3、 对机器进行控制,可按废品出现的情况,控制机器的运行速度; 3, control of the machine, where the waste may occur, controlling the machine speed;

4、 对产品质量进行统计,必要时还可以联网,通报产品情况。 4, product quality statistics, where necessary, can be networked to inform and products. 本发明广泛应用于各种彩色印刷文件的质量检测,尤其适用于对彩色印 The present invention is widely used in color printing quality inspection documents, especially for color printing

刷质量要求严格的钞票。 Brush strict quality requirements of the bill.

采样密度为原始图像的4%左右的原因可作如下说明: 一张钞票的像元点 Cause sampling density is about 4% of the original image may be explained as follows: a pixel dot banknotes

数约为320000个。 The number is about 320,000. 按照现行钞票特点,将此小张钞票可按相同颜色分成16 个区,则每个区的平均图像点数为20000个;如果采样密度取为4%,即可取得800个采样点。 Under the current characteristics of the banknote, the banknote may be the same color this Zhang divided into 16 regions, the average number of points per image area is 20,000; to get 800 samples if the sampling density is taken to be 4%. 对于一个颜色一致的小区,测量如此多的采样点的色度误差,它的平均色度误差就足以精确代表区域内的平均误差。 For a uniform color cell, the chromaticity measurement error so many sampling points, it is sufficient to average chromaticity error accurately represent the average error region. 因此,采样密度取为原始图像的4%左右是允许的。 Accordingly, the sampling density is taken to be about 4% of the original image is permitted.

实施例2:采样密度选为原始图像的1%,其他同实施例1。 Example 2: sampling density preferably 1% of the original image, the same as in Example 1 other. 实施例3:采样密度为原始图像的10%,其他同实施例1。 Example 3: 10% of the sampling density of the original image, the same as in Example 1 other.

Claims (3)

  1. 1、一种彩色印刷质量检查方法,其特征在于:对彩色印刷的图像按颜色分区后进行采样,采样后对采样图像的色度误差直接进行检查,采样密度为原始图像的1%-10%。 A color printing quality inspection method, comprising: printing a color image is sampled by the color partition the chroma sampling error is checked directly sampled image sample density of 1% -10% of the original images .
  2. 2、 根据权利要求1所述的彩色印刷质量检查方法,其特征在于:对所述采样图像采用LUV色度模型或LAB色度模型进行检查。 2. The color print quality inspection method according to claim 1, wherein: a check using LAB or LUV color model models the chrominance sampled image.
  3. 3、 根据权利要求1所述的彩色印刷质量检查方法,其特征在于:所述采样密度为原始图像的3.5%—4.5%。 3. The color print quality inspection method according to claim 1, wherein: said sampling density is 3.5% -4.5% of the original image.
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CN105938088A (en) * 2016-04-14 2016-09-14 明基材料有限公司 Detection method and detection system for color defects of contact lenses

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CN1037773A (en) 1988-05-20 1989-12-06 Univ Zhejiang Quick detector of colour
US5068810A (en) 1989-07-14 1991-11-26 Gretag Aktiengesellschaft Process for the determination of colorimetric differences between two screen pattern fields printed by a printing machine and process for the color control or ink regulation of the print of a printing machine
US5724259A (en) 1995-05-04 1998-03-03 Quad/Tech, Inc. System and method for monitoring color in a printing press

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Publication number Priority date Publication date Assignee Title
CN1037773A (en) 1988-05-20 1989-12-06 Univ Zhejiang Quick detector of colour
US5068810A (en) 1989-07-14 1991-11-26 Gretag Aktiengesellschaft Process for the determination of colorimetric differences between two screen pattern fields printed by a printing machine and process for the color control or ink regulation of the print of a printing machine
US5724259A (en) 1995-05-04 1998-03-03 Quad/Tech, Inc. System and method for monitoring color in a printing press

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