CN100526075C - Method of using camera to carry out controlling automatic alignment for printing machine - Google Patents

Method of using camera to carry out controlling automatic alignment for printing machine Download PDF

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Publication number
CN100526075C
CN100526075C CNB2007100552454A CN200710055245A CN100526075C CN 100526075 C CN100526075 C CN 100526075C CN B2007100552454 A CNB2007100552454 A CN B2007100552454A CN 200710055245 A CN200710055245 A CN 200710055245A CN 100526075 C CN100526075 C CN 100526075C
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China
Prior art keywords
colour code
color
image
video camera
printing
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CNB2007100552454A
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Chinese (zh)
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CN101003202A (en
Inventor
孙海涛
黎妹红
王强
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长春市吉海测控技术有限责任公司
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Abstract

A method for controlling the automatic chromaticity of printing machine by use of camera includes such steps as light printing a marker for detecting the chromaticity error, using a camera to take the digital image of the marker area, transmitting the digital image, detecting the chromaticity error, outputting chromaticity control signal, and fast regulating the position of printing drum.

Description

Utilize video camera to carry out the method for printing machine register control control

Technical field

The present invention relates to a kind of method of printing machine register control control.

Background technology

Existing printing machine is the color separation printing, and promptly a printing station only prints a kind of color, and is last when of the same colour when having printed when printable fabric just has been printed on pattern of all kinds during successively by each printing element, just formed complete multicolour pattern.But in printing process, because the variation of the factors such as physical characteristic of system tension, temperature, printable fabric, can cause the original printing position of actual print position deviation and produce error, this error just is called chromatography error.

Because the existence of chromatography error, high-speed press is at start, change of lap and wash in the process of version and can produce a large amount of waste products, and the start waste product is sometimes up to five, 6,000 parts more than.Common mode of operation is manually-operated at present, and the operator constantly goes to observe the printing quality of printed matter by naked eyes, finds to go after deviation occurring the position of the corresponding printing cylinder of manual adjustments, hand labor intensity is very big, labor productivity is low, and percent defective is very high, and waste is serious.

Summary of the invention

The invention provides a kind of method of utilizing video camera to carry out printing machine register control control, when solving the artificial perusal of present employing, the bad control of the printing quality of printed matter, the problem that percent defective is high.

The technical scheme that the present invention takes is: comprise the following steps:

Shine a mark that is used for detecting chromatography error specially simultaneously in the outside of every look printed patterns when one, making a plate;

Two, finish at each color printing, the position of printed matter before entering receiving section place a video camera, be used to detect the printing registration error, when video camera was passed through in the zone that is printed on colour code on the printed matter, video camera was captured, and obtains the digital picture in this colour code zone;

Three, this digital picture is sent to central server,

Four, in central server, detect the variation of colour code position by image processing algorithm, compare with the colour code position and the reference position that detect, detect the chromatography error of each station color.

Five, the output of alignment control signal is gone to control the anglec of rotation of motor in the dynamo-electric governor motion, after the mechanical actuating mechanism transmission, the quick adjustment correction is carried out in the printing cylinder position, make it consistent with a reference value.

A kind of technical scheme of the present invention is: shine a sets of color patches that is used for detecting chromatography error specially simultaneously in the outside of every look printed patterns during plate-making; This sets of color patches is made of one group of color sign that is shaped as rhombus, and colour code can be arranged in any position of forme, other patterns can occur around the sets of color patches;

Colour code length of side a is 0.3-3 millimeters, and colour code and colour code centre-to-centre spacing m are 3-15 millimeters, and colour code can be according to the forme circumferential array, also can be according to the forme axially-aligned; The colour code number of each sets of color patches is N+1, and wherein N is the printing color number; Sets of color patches foremost and rearmost colour code are with a kind of color, and this color colour code is as the benchmark colour code, as the foundation of registration error detection; This color can be selected the color of gray value maximum in the print color usually, if comprise black in the print color, then can select black usually, is arranged as the colour code of other non-benchmark colors in the middle of the sets of color patches;

This sets of color patches is to make on forme, printed come out in printing process; In design during forme, two colour codes of exposure on the forme of benchmark color, the colour code spacing is N * m millimeter, N-printing color number wherein, m-colour code centre-to-centre spacing.The mark that on the forme of other non-benchmark colors, respectively exposes, and along the colour code orientation m millimeter that staggers successively;

Sets of color patches exposure when plate-making forms, and prints on printable fabric by forme in printing process.

A kind of technical scheme of the present invention is: in step 4: concrete processing method comprises:

(1), system calibrating

In automatic chromatography control system, guarantee the certainty of measurement of color chart picture, at first just need obtain stable and high-quality image.According to the theory of machine vision, move the camera to follow the subject's movement a plurality of factors such as position, performance, angle of camera of the imaging of image are relevant.Therefore, before obtaining high-quality image, need demarcate video camera.This method adopts adaptive camera self-calibration algorithm based on the Pin-hole model in the video camera imaging model.In the application of calibration algorithm, the position of video camera and measured target and angle are very little to the quality influence of imaging, have reached the purpose that guarantees picture quality;

Z C u v 1 = a x 0 u 0 0 0 a y v 0 0 0 0 1 0 R t 0 T 1 X w Y w Z w 1 = M 1 M 2 X w = MX w ;

Wherein M is a projection matrix, and M1 is the inner parameter of video camera, and M2 is the external parameter of video camera;

(2), graphical analysis

Adopt adaptivity image filtering model, use image processing techniques, finish image and cut apart based on the Hough conversion;

ρ=x×cosθ+y×sinθ

k=(-cosθ 1)/(sinθ 1)

y=k×x+b

b=ρ 1/(sinθ 1)+oy-ox×k

Wherein: (ox oy) is centre coordinate, C (ρ, θ) expression accumulated value array.

(3), shape is judged

According to the image after cutting apart, all shapes of the appearance in the bianry image are carried out feature extraction, calculate shape area, the number on limit, all angle feature differentiation colour code and other shapes of shape;

(4), pattern measurement

At first on the forme of benchmark color the exposure two colour codes, the colour code spacing is fixed as N * m millimeter; Then, measure the number of pixels L in image between two benchmark colour codes of fixed range according to the image after cutting apart, draw the conversion factor o=N * m/L of two coordinate spaces then;

Then according to the position of the colour code profile of shape judged result record, by calculating the center of each colour code profile, obtain each rhombus colour code piece and reference colours and be marked on centre coordinate difference n on the image, according to n * o, o-conversion factor wherein, calculate colour code and reference colours target actual range, thereby judge current registration error, export to control module and be used to adjust the cylinder use.

Characteristics of the present invention: adopted image processing techniques, the alignment precision height; Permission print to detect colour code around print other guide, can automatic distinguishing colour code and non-colour code content, improved the printable fabric utilization rate greatly, save raw material; Adapt to minimum colour code, save raw material; Alignment speed is fast, and paper loss is little.This device adopts the autozoom technology, can adjust focal length automatically, and extremely strong anti-printable fabric shake ability is arranged.

Description of drawings

Fig. 1 is a flow chart of the present invention;

Fig. 2 is the schematic diagram that colour code of the present invention is vertically arranged.

Fig. 3 is the transversely arranged schematic diagram of colour code of the present invention.

Fig. 4 realizes a kind of principle of device block diagram of the present invention.

The specific embodiment

Comprise the following steps:

Shine a sets of color patches that is used for detecting chromatography error specially simultaneously in the outside of every look printed patterns when one, making a plate;

Shown in accompanying drawing 2 and accompanying drawing 3, this sets of color patches is made of one group of color sign that is shaped as rhombus, and colour code can be arranged in any position of forme, other patterns can occur around the sets of color patches;

Colour code length of side a is 0.3-3 millimeters, and colour code and colour code centre-to-centre spacing m are 3-15 millimeters, and colour code can be according to the forme circumferential array, also can be according to the forme axially-aligned; The colour code number of each sets of color patches is N+1, and wherein N is the printing color number, and such as four-color process, the sets of color patches that then prints comprises 5 colour codes.

Sets of color patches foremost and rearmost colour code are with a kind of color, and this color colour code is as the benchmark colour code, as the foundation of registration error detection; This color can be selected the color of gray value maximum in the print color usually, if comprise black in the print color, then can select black usually, is arranged as the colour code of other non-benchmark colors in the middle of the sets of color patches;

This sets of color patches is to make on forme, printed come out in printing process; In design during forme, two colour codes of exposure on the forme of benchmark color, the colour code spacing is N * m millimeter, N-printing color number wherein, m-colour code centre-to-centre spacing.The mark that on the forme of other non-benchmark colors, respectively exposes, and along the colour code orientation m millimeter that staggers successively;

Sets of color patches exposure when plate-making forms, and prints on printable fabric by forme in printing process.

Two, finish at each color printing, the position of printed matter before entering receiving section place a video camera, be used to detect the printing registration error, when video camera was passed through in the zone that is printed on colour code on the printed matter, video camera was captured, and obtains the digital picture in this colour code zone;

Three, this digital picture is sent to central server,

Four, in central server, detect the variation of colour code position by image processing algorithm, compare with the colour code position and the reference position that detect, detect the chromatography error of each station color, concrete processing method comprises:

(1), system calibrating

In automatic chromatography control system, guarantee the certainty of measurement of color chart picture, at first just need obtain stable and high-quality image.According to the theory of machine vision, move the camera to follow the subject's movement a plurality of factors such as position, performance, angle of camera of the imaging of image are relevant.Therefore, before obtaining high-quality image, need demarcate video camera.This method adopts adaptive camera self-calibration algorithm based on the Pin-hole model in the video camera imaging model (shown in formula 1-1).In the application of calibration algorithm, the position of video camera and measured target and angle are very little to the quality influence of imaging, have reached the purpose that guarantees picture quality.

Z C u v 1 = a x 0 u 0 0 0 a y v 0 0 0 0 1 0 R t 0 T 1 X w Y w Z w 1 = M 1 M 2 X w = MX w - - - ( 1 - 1 )

Wherein M is a projection matrix, and M1 is the inner parameter of video camera, and M2 is the external parameter of video camera.

(2), graphical analysis

Because influences such as the quality of printable fabric, color, roughness, may there be various interference of noise in the color chart picture that digital image sensor obtains.The existence of noise can cause the erroneous judgement of colour code position and measurement, thereby influences the precision of chromatography control system.This method adopts adaptivity image filtering model at the application scenario and the type that may have noise of chromatography control system, uses the image processing techniques (based on the straight-line detection technology shown in the formula 1-2) based on the Hough conversion, finishes image and cuts apart.

ρ=x×cosθ+y×sinθ (1-2)

k=(-cosθ 1)/(sinθ 1)

y=k×x+b

b=ρ 1/(sinθ 1)+oy-ox×k

Wherein: (ox oy) is centre coordinate, C (ρ, θ) expression accumulated value array.

(3), shape is judged

According to the image after cutting apart, all shapes to the appearance in the bianry image are carried out feature extraction, calculate shape area, the number on limit, all angle feature differentiation colour code and other shapes of shape, if shape area is 300-400 pixels, the number on limit is 4, and all angle of shape is all about 90 degree, then judge the current rhombus colour code that is shaped as, shape is judged two purposes:

1, detects in the present image whether N+1 rhombus colour code is arranged, wherein N-printing color number.Judge current effective duty that whether is in.If current do not have colour code or be not that complete colour code is arranged, proof system can be sought the mark motor by adjustment and obtain the image that complete colour code is arranged not in effective duty.

If 2 current be effective duty, the position of then writing down each colour code profile changes the pattern measurement part over to.

(4), pattern measurement

At first, according to step 1, two colour codes of exposure on the forme of benchmark color, the colour code spacing is fixed as N * m millimeter; Then, measure the number of pixels L in image between two benchmark colour codes of fixed range according to the image after cutting apart, draw the conversion factor o=N * m/L of two coordinate spaces then.

Then according to the position of the colour code profile of shape judged result record, by calculating the center of each colour code profile, obtain each rhombus colour code piece and reference colours and be marked on centre coordinate difference n on the image, according to n * o, o-conversion factor wherein, calculate colour code and reference colours target actual range, thereby judge current registration error, export to control module and be used to adjust the cylinder use.

Five, the output of alignment control signal is gone to control the anglec of rotation of motor in the dynamo-electric governor motion, after the mechanical actuating mechanism transmission, the quick adjustment correction is carried out in the printing cylinder position, make it consistent with a reference value.

Referring to Fig. 4, below be to realize a kind of device of the present invention.

Video camera is connected with central control server, central control server is connected with each field controller by industrial field bus, the photoelectric encoder that is used for the system signal detection and localization is connected with central control server, display is connected with central control server, and each field controller is connected with operating motor respectively.

Central control server: be made of high-performance industrial control computer, industrial field bus card, data collecting card, industrial computer adopts IPC-6808.

Video camera: constitute by light source and CCD circuit, be used for chromatography error and detect.

Field controller: constitute by intelligent chip and advance signal modulate circuit, be used for error signal conditioning and data and handle and export control; Microcontroller adopts MCS-98.

Photoelectric encoder: play synchronous effect, the signal framing that is used for system detects.

Man-machine interface: constitute by the lcd touch display.

Claims (2)

1, a kind of method of utilizing video camera to carry out the control of printing machine register control comprises the following steps:
Shine a mark that is used for detecting registration error specially simultaneously in the outside of every look printed patterns when one, making a plate;
Two, finish at each color printing, the position of printed matter before entering receiving section place a video camera, be used to detect the printing registration error, when video camera was passed through in the zone that is printed on the rhombus colour code on the printed matter, video camera was captured, and obtains the digital picture in this colour code zone;
Three, this digital picture is sent to central server;
Four, in central server, detect the variation of colour code position by image processing algorithm, compare with the colour code position and the reference position that detect, detect the chromatography error of each station color; Concrete Processing Algorithm comprises:
(1), system calibrating
In the register control control system, guarantee the certainty of measurement of color chart picture, at first just need obtain stable and high-quality image, theory according to machine vision, the move the camera to follow the subject's movement position of camera of the imaging of image, performance, a plurality of factors such as angle are relevant, therefore, before obtaining high-quality image, need demarcate video camera, this algorithm adopts adaptive camera self-calibration algorithm based on the Pin-hole model in the video camera imaging model, in the application of calibration algorithm, the position of video camera and measured target and angle are very little to the quality influence of imaging, have reached the purpose that guarantees picture quality;
Z C u v 1 = a x 0 u 0 0 0 a y v 0 0 0 0 1 0 R t 0 T 1 X w Y w Z w 1 = M 1 M 2 X w = MX w ;
Wherein M is a projection matrix, and M1 is the inner parameter of video camera, and M2 is the external parameter of video camera;
(2), graphical analysis
Adopt adaptivity image filtering model, use image processing techniques, finish image and cut apart based on the Hough conversion;
ρ=x×cosθ+y×sinθ
k=(-cosθ 1)/(sinθ 1)
y=k×x+b
b=ρ 1/(sinθ 1)+oy-ox×k
Wherein: (ox oy) is centre coordinate, C (ρ, θ) expression accumulated value array;
(3), shape is judged
According to the image after cutting apart, all shapes of the appearance in the bianry image are carried out feature extraction, calculate shape area, the number on limit, all angle feature differentiation colour code and other shapes of shape;
(4), pattern measurement
At first on the forme of benchmark color the exposure two colour codes, the colour code spacing is fixed as N * m millimeter; Then, measure the number of pixels L in image between two benchmark colour codes of fixed range according to the image after cutting apart, draw the conversion factor o=N * m/L of two coordinate spaces then;
Then according to the position of the colour code profile of shape judged result record, by calculating the center of each colour code profile, obtain each rhombus colour code piece and reference colours and be marked on centre coordinate difference n on the image, according to n * o, o-conversion factor wherein, calculate colour code and reference colours target actual range, thereby judge current registration error, export to control module and be used to adjust the cylinder use;
Five, the output of alignment control signal is gone to control the anglec of rotation of motor in the dynamo-electric governor motion, after the mechanical actuating mechanism transmission, the quick adjustment correction is carried out in the printing cylinder position, make it consistent with a reference value.
2, the method for utilizing video camera to carry out the control of printing machine register control according to claim 1 is characterized in that: shine a sets of color patches that is used for detecting chromatography error specially simultaneously in the outside of every look printed patterns during plate-making; This sets of color patches is made of one group of color sign that is shaped as rhombus, and colour code is arranged in any position of forme, other patterns can occur around the sets of color patches;
Colour code length of side a is 0.3-3 millimeters, and colour code and colour code centre-to-centre spacing m are 3-15 millimeters, and colour code is according to the forme circumferential array or according to the forme axially-aligned; The colour code number of each sets of color patches is N+1, and wherein N is the printing color number; Sets of color patches foremost and rearmost colour code are with a kind of color, this color colour code is as the benchmark colour code, as the foundation that registration error detects, this color can be selected the color of gray value maximum in the print color usually, is arranged as the colour code of other non-benchmark colors in the middle of the sets of color patches;
This sets of color patches is to make on forme, printed come out in printing process; When the design forme, two colour codes of exposure on the forme of benchmark color, the colour code spacing is N * m millimeter, N-printing color number wherein, m-colour code centre-to-centre spacing, the mark that on the forme of other non-benchmark colors, respectively exposes, and along the colour code orientation m millimeter that staggers successively;
Sets of color patches exposure when plate-making forms, and prints on printable fabric by forme in printing process.
CNB2007100552454A 2007-01-19 2007-01-19 Method of using camera to carry out controlling automatic alignment for printing machine CN100526075C (en)

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