CN102765249A - Machine vision detection method based on four-colour printed matter registration detection marks - Google Patents

Machine vision detection method based on four-colour printed matter registration detection marks Download PDF

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Publication number
CN102765249A
CN102765249A CN2012102364126A CN201210236412A CN102765249A CN 102765249 A CN102765249 A CN 102765249A CN 2012102364126 A CN2012102364126 A CN 2012102364126A CN 201210236412 A CN201210236412 A CN 201210236412A CN 102765249 A CN102765249 A CN 102765249A
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Prior art keywords
circular ring
image
circle
ring marks
central coordinate
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Chinese (zh)
Inventor
费敏锐
刘凯龙
周文举
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Abstract

The invention discloses a machine vision detection method based on four-colour printed matter registration detection marks, comprising the following steps of: presetting graphs of the four-colour printed matter registration detection marks, and taking the circle centre of a black solid circular mark graph as a reference of the registration detection marks, wherein the circle centre of a yellow annular mark graph, the circle centre of a pinkish red annular mark graph, and the circle centre of a cyan annular mark graph are respectively as same as the circle centre of the black solid circular mark graph; acquiring images of preset graphs of the registration detection marks during a printing process; respectively obtaining coordinates of the circle centres of the registration detection marks in the images by a computer system; calculating registration deviation via the coordinates of the circle centres; comparing the squared value of the registration deviation with a deviation tolerance level; and finally, outputting a registration deviation result. The registration detection marks are simple in structure and small in occupied space, and camera can be convenient to rapidly and accurately shoot. According to the corresponding detection method, only deviation analysis does need to be performed via circle centre parameters, thus being high in detection efficiency, intuitive in result, and capable of realizing online detection for high-speed printed matters.

Description

A kind of machine vision detection method based on four look printing alignment certification marks
Technical field
What the present invention relates to is a kind of machine vision detection method based on four look printing alignment certification marks, particularly a kind of employing four look printing alignment certification marks and the corresponding machine vision detection method of four look printing alignment certification marks.
Background technology
In colored printing printing process, often adopt Y (yellow), M (magenta), C (cyan), four kinds of colors of BL (black) to print.Printing back staff regulates registration mechanism through estimating near the alignment certification mark deviation size the printing edge, hopes that finally four looks overlap as far as possible, and printing just can reach best definition.The alignment certification mark is the four-color process technology key link with corresponding detection method.
It is the mode through the artificial visually examine that the alignment of traditional colored printing detects; Operating personnel face toward colored printing with magnifying glass; Estimate the deviation between yellow mark, magenta mark, cyan mark, the density bullet again, the alignment of above-mentioned traditional chromatograp detects the shortcoming that exists and is: 1. alignment speed is slow, efficient is low; 2. it is unstable to detect quality.When the repetitive operation work, artificial visually examine's deviation is big, even false retrieval can occur, causes unstable product quality; 3. it is long to detect control cycle.Because manual detection is non-online detection, it is long to detect control cycle, in case the product quality deviation appears in production line, can't in time adjust, and has a large amount of defect wares and is printed out, causes waste.
Defective to artificial visually examine in the alignment detection exists presses for a kind of on-line automatic monitoring system.Machine Vision Detection has untouchable, and detection speed is fast, and accuracy rate is high; The testing result reliable characteristics, the existing precedent of using in the register partial difference detection range, for example; Its name is called " automatic detection method for printed product four-color register partial difference ", and the patent No. is " 200810102897.3 ".But this method is not explained the alignment certification mark, and on the market many alignment certification marks such as linear pattern alignment certification mark to take up an area of the space bigger; Corresponding registration test method is complicated, can make the camera coverage big, and the image of collection is handled also comparatively complicated; Consuming time longer, be difficult to satisfy the requirement of fast detecting, particularly; On some newspaper printing production lines, per second need detect more than 13 parts of newspapers, therefore at least; Press for and develop a kind of simple in structurely, take up an area of little alignment certification mark and the high efficiency registration test method in space.
Summary of the invention
To the technical problem that exists in the above prior art; The purpose of this invention is to provide the corresponding machine vision detection method of a kind of four look printing alignment certification marks; Through the rapid analysis of machine vision to four look printing alignment certification mark deviations; Realize the online detection of four look printings, improve alignment detection speed and alignment detection efficiency.
In order to achieve the above object; Design of the present invention is: at first; The figure of preset four look printing alignment certification marks; The figure of this mark comprises: solid black circle mark figure, yellow circular ring marks figure, magenta circular ring marks figure, cyan circular ring marks figure; The center of circle with solid black circle mark figure is the benchmark of alignment certification mark, and the center of circle of yellow circular ring marks figure, magenta circular ring marks figure, cyan circular ring marks figure is the same center of circle with the center of circle of solid black circle mark figure respectively; Secondly in printing process, gather the image of preset alignment certification mark figure; Then, obtain the central coordinate of circle of the alignment certification mark in the image respectively by computer system; Calculate the chromatography deviation through central coordinate of circle then again; Again chromatography deviation square value and deviation tolerance are compared; At last, chromatography deviation, the chromatography deviation square value that exceeds deviation tolerance scope are outputed to the deviation repairing mechanism and carry out the deviation reparation.
According to the foregoing invention design, a kind of machine vision detection method based on four look printing alignment certification marks of the present invention specifically comprises the steps:
(1), the figure of preset four look printing alignment certification marks;
(2), gather the image of preset alignment certification mark figure, this image is sent to computer system;
(3), obtain the central coordinate of circle of the alignment certification mark in the four look printing alignment certification mark images respectively;
(4), calculate the chromatography deviation of the central coordinate of circle of yellow circular ring marks image, magenta circular ring marks image, cyan circular ring marks image respectively with respect to solid black circle mark image central coordinate of circle;
(5), respectively relatively, with transverse axis chromatography deviation square value, longitudinal axis chromatography deviation square value and transverse axis deviation tolerance, longitudinal axis deviation tolerance obtain respectively exceeding transverse axis deviation tolerance transverse axis chromatography deviation square value, exceed the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance;
(6), respectively the central coordinate of circle of the described yellow circular ring marks image of step (4), magenta circular ring marks image, cyan circular ring marks image is outputed to the deviation repairing mechanism with respect to the described transverse axis chromatography deviation square value that exceeds transverse axis deviation tolerance of the chromatography deviation of solid black circle mark image central coordinate of circle and step (5), the longitudinal axis chromatography deviation square value that exceeds longitudinal axis deviation tolerance and carry out the deviation reparation.
The figure of the described preset four look printing alignment certification marks of above-mentioned steps (1) comprises: solid black circle mark figure, yellow circular ring marks figure, magenta circular ring marks figure, cyan circular ring marks figure; The center of circle with solid black circle mark figure is the benchmark of alignment certification mark, and the center of circle of yellow circular ring marks figure, magenta circular ring marks figure, cyan circular ring marks figure is the same center of circle with the center of circle of solid black circle mark figure respectively;
The described central coordinate of circle that obtains the alignment certification mark in the four look printing alignment certification mark images respectively of above-mentioned steps (3), its concrete steps are following:
(3-1), adopt vectorial median filter method to carry out filtering to the four look printing alignment certification mark images that read in the computer system; Obtain filtered four look printing alignment certification mark image I MAGE1, this image I MAGE1 is converted into four look printing alignment certification mark gray level image IMAGE2;
(3-2), four look printing alignment certification mark gray level image IMAGE2 are carried out edge extracting, obtain yellow circular ring marks image border, magenta circular ring marks image border, cyan circular ring marks image border and solid black circle mark image border;
(3-3), three point coordinates, three point coordinates on the magenta circular ring marks image border, three point coordinates on the cyan circular ring marks image border and three point coordinates on the solid black circle mark image border on the described yellow circular ring marks of step (3-2) image border are set respectively; Judge three above-mentioned point coordinates respectively not on same straight line, its concrete steps are following:
Three point coordinates that (3-3-1), are provided with on the described yellow circular ring marks of above-mentioned steps (3-2) image border are (
Figure 82584DEST_PATH_IMAGE001
; ), ( ; ), (
Figure 610069DEST_PATH_IMAGE005
,
Figure 449849DEST_PATH_IMAGE006
);
Coordinate on the then yellow circular ring marks image border (
Figure 930509DEST_PATH_IMAGE001
;
Figure 488529DEST_PATH_IMAGE002
) with yellow circular ring marks image border on coordinate (
Figure 893097DEST_PATH_IMAGE003
;
Figure 587383DEST_PATH_IMAGE004
) straight slope be
Figure 504524DEST_PATH_IMAGE007
, its expression formula is:
Figure 284261DEST_PATH_IMAGE007
?=
Figure 741787DEST_PATH_IMAGE008
Coordinate on the then yellow circular ring marks image border (
Figure 556159DEST_PATH_IMAGE001
;
Figure 378622DEST_PATH_IMAGE002
) with yellow circular ring marks image border on coordinate (
Figure 645655DEST_PATH_IMAGE005
; ) straight slope be
Figure 825019DEST_PATH_IMAGE009
, its expression formula is:
Figure 818382DEST_PATH_IMAGE009
?=
Figure 572712DEST_PATH_IMAGE010
Judge above-mentioned straight slope
Figure 372041DEST_PATH_IMAGE007
With straight slope
Figure 895426DEST_PATH_IMAGE009
Whether unequal, if unequal, three point coordinates on the above-mentioned yellow circular ring marks edge ( ,
Figure 566896DEST_PATH_IMAGE002
), (
Figure 842019DEST_PATH_IMAGE003
,
Figure 298539DEST_PATH_IMAGE004
), (
Figure 633706DEST_PATH_IMAGE005
,
Figure 362627DEST_PATH_IMAGE006
) be not on same straight line, then change step (3-4), otherwise finish determining program
(3-3-2), three point coordinates that are provided with on the described magenta circular ring marks of above-mentioned steps (3-2) edge are (
Figure 441442DEST_PATH_IMAGE011
;
Figure 1736DEST_PATH_IMAGE012
), ( ;
Figure 724021DEST_PATH_IMAGE014
), (
Figure 606527DEST_PATH_IMAGE015
;
Figure 270595DEST_PATH_IMAGE016
)
The coordinate on the magenta circular ring marks edge (
Figure 213143DEST_PATH_IMAGE011
then; ) with magenta circular ring marks edge on coordinate ( ;
Figure 606582DEST_PATH_IMAGE014
) straight slope be
Figure 720031DEST_PATH_IMAGE017
, its expression formula is:
?=
The coordinate on the magenta circular ring marks edge ( then;
Figure 28467DEST_PATH_IMAGE012
) with magenta circular ring marks edge on coordinate (
Figure 440994DEST_PATH_IMAGE015
;
Figure 468992DEST_PATH_IMAGE016
) straight slope be
Figure 650575DEST_PATH_IMAGE019
, its expression formula is:
Figure 902565DEST_PATH_IMAGE019
?=
Figure 802388DEST_PATH_IMAGE020
Judge whether above-mentioned straight slope
Figure 368498DEST_PATH_IMAGE017
and straight slope
Figure 670167DEST_PATH_IMAGE019
be unequal; If it is unequal; Three point coordinates on the above-mentioned magenta circular ring marks edge (
Figure 342325DEST_PATH_IMAGE011
;
Figure 729444DEST_PATH_IMAGE012
), (
Figure 99246DEST_PATH_IMAGE013
;
Figure 989841DEST_PATH_IMAGE014
), (
Figure 786896DEST_PATH_IMAGE015
;
Figure 458049DEST_PATH_IMAGE016
) be not on same straight line; Then change step (3-4), otherwise finish determining program;
(3-3-3), three point coordinates that are provided with on the described cyan circular ring marks of above-mentioned steps (3-2) image border are (
Figure 631541DEST_PATH_IMAGE021
;
Figure 642223DEST_PATH_IMAGE022
), ( ; ), (
Figure 230964DEST_PATH_IMAGE025
;
Figure 96152DEST_PATH_IMAGE026
)
The coordinate on the cyan circular ring marks image border (
Figure 235009DEST_PATH_IMAGE021
then;
Figure 880754DEST_PATH_IMAGE022
) with cyan circular ring marks image border on coordinate (
Figure 130470DEST_PATH_IMAGE023
;
Figure 115743DEST_PATH_IMAGE024
) straight slope be
Figure 425502DEST_PATH_IMAGE027
, its expression formula is:
?=
Figure 884655DEST_PATH_IMAGE028
The coordinate on the cyan circular ring marks image border (
Figure 724435DEST_PATH_IMAGE021
then;
Figure 205095DEST_PATH_IMAGE022
) with cyan circular ring marks image border on coordinate (
Figure 559853DEST_PATH_IMAGE025
; ) straight slope be , its expression formula is:
Figure 762798DEST_PATH_IMAGE029
?=
Figure 808114DEST_PATH_IMAGE030
Judge whether above-mentioned straight slope
Figure 16373DEST_PATH_IMAGE027
and straight slope
Figure 565166DEST_PATH_IMAGE029
be unequal; If it is unequal; Three point coordinates on the above-mentioned cyan circular ring marks image border (
Figure 653208DEST_PATH_IMAGE021
;
Figure 920241DEST_PATH_IMAGE022
), (
Figure 181458DEST_PATH_IMAGE023
;
Figure 584758DEST_PATH_IMAGE024
), (
Figure 843701DEST_PATH_IMAGE025
;
Figure 598030DEST_PATH_IMAGE026
) be not on same straight line; Then change step (3-4), otherwise finish determining program;
(3-3-4), three point coordinates that are provided with on the described solid black circle mark of above-mentioned steps (3-2) image border are (
Figure 646626DEST_PATH_IMAGE031
;
Figure 170011DEST_PATH_IMAGE032
), (
Figure 599856DEST_PATH_IMAGE033
;
Figure 575902DEST_PATH_IMAGE034
), (
Figure 116605DEST_PATH_IMAGE035
;
Figure 822393DEST_PATH_IMAGE036
)
The coordinate on the solid black circle mark image border (
Figure 157559DEST_PATH_IMAGE031
then; ) with solid black circle mark image border on coordinate ( ;
Figure 276322DEST_PATH_IMAGE034
) straight slope be
Figure 782390DEST_PATH_IMAGE037
, its expression formula is:
?=
Figure 881113DEST_PATH_IMAGE038
The coordinate on the solid black circle mark edge (
Figure 295913DEST_PATH_IMAGE031
then;
Figure 238462DEST_PATH_IMAGE032
) with solid black circle mark image border on coordinate ( ;
Figure 97013DEST_PATH_IMAGE036
) straight slope be
Figure 881167DEST_PATH_IMAGE039
, its expression formula is:
Figure 729038DEST_PATH_IMAGE039
?=
Figure 654268DEST_PATH_IMAGE040
Confirm whether above-mentioned straight slope
Figure 878576DEST_PATH_IMAGE037
and straight slope
Figure 267969DEST_PATH_IMAGE039
be unequal; If it is unequal; Three point coordinates on the above-mentioned solid black circle mark image border (
Figure 552320DEST_PATH_IMAGE031
;
Figure 964847DEST_PATH_IMAGE032
), (
Figure 727267DEST_PATH_IMAGE033
;
Figure 721898DEST_PATH_IMAGE034
), (
Figure 177151DEST_PATH_IMAGE035
;
Figure 76973DEST_PATH_IMAGE036
) not on same straight line; Then change step (3-4), otherwise finish determining program;
(3-4), according to three point coordinates on the described definite yellow circular ring marks image border of step (3-3), three point coordinates on the magenta circular ring marks image border, the central coordinate of circle (
Figure 643084DEST_PATH_IMAGE041
that three point coordinates and three point coordinates on the solid black circle mark image border on the cyan circular ring marks image border are selected yellow circular ring marks; ), the central coordinate of circle (
Figure 367643DEST_PATH_IMAGE043
of magenta circular ring marks;
Figure 754762DEST_PATH_IMAGE044
), the central coordinate of circle (
Figure 858985DEST_PATH_IMAGE045
of cyan circular ring marks;
Figure 15160DEST_PATH_IMAGE046
), the central coordinate of circle (
Figure 123799DEST_PATH_IMAGE047
, ) of solid black circle mark;
(3-4-1), select yellow circular ring marks edge three point coordinates (
Figure 906127DEST_PATH_IMAGE001
;
Figure 916808DEST_PATH_IMAGE002
), ( ;
Figure 43213DEST_PATH_IMAGE004
), (
Figure 489238DEST_PATH_IMAGE005
;
Figure 433054DEST_PATH_IMAGE006
) central coordinate of circle ( ;
Figure 155340DEST_PATH_IMAGE042
), the method for employing is following:
Whether the central coordinate of circle of judging yellow circular ring marks image meets the following conditions simultaneously:
Figure 405056DEST_PATH_IMAGE049
And
Figure 452646DEST_PATH_IMAGE050
And
Figure 762405DEST_PATH_IMAGE051
If satisfy; Then select the central coordinate of circle of yellow circular ring marks image to be (
Figure 833129DEST_PATH_IMAGE041
; ); Change step (4-1), otherwise finish option program;
(3-4-2), red circular ring marks edge three point coordinates (
Figure 37900DEST_PATH_IMAGE011
of selection;
Figure 518560DEST_PATH_IMAGE012
), (
Figure 811001DEST_PATH_IMAGE013
;
Figure 668098DEST_PATH_IMAGE014
), ( ;
Figure 76263DEST_PATH_IMAGE016
) central coordinate of circle (
Figure 121579DEST_PATH_IMAGE043
;
Figure 329838DEST_PATH_IMAGE044
), the method for employing is following:
Whether the central coordinate of circle of judging magenta circular ring marks image meets the following conditions simultaneously:
Figure 878631DEST_PATH_IMAGE052
And
And
Figure 233706DEST_PATH_IMAGE054
If satisfy; Then the central coordinate of circle of the red circular ring marks image of selection is (
Figure 167027DEST_PATH_IMAGE043
;
Figure 898223DEST_PATH_IMAGE044
); Change step (4-2), otherwise finish option program;
(3-4-3), select cyan circular ring marks edge three point coordinates ( ;
Figure 645916DEST_PATH_IMAGE022
), ( ;
Figure 483477DEST_PATH_IMAGE024
), (
Figure 647742DEST_PATH_IMAGE025
;
Figure 889367DEST_PATH_IMAGE026
) central coordinate of circle (
Figure 430070DEST_PATH_IMAGE045
;
Figure 870279DEST_PATH_IMAGE046
), the method for employing is following:
Whether the central coordinate of circle of judging cyan circular ring marks image meets the following conditions simultaneously:
Figure 471024DEST_PATH_IMAGE055
And
And
If satisfy; Then select the central coordinate of circle of cyan circular ring marks image to be (
Figure 589787DEST_PATH_IMAGE045
;
Figure 95855DEST_PATH_IMAGE046
); Change step (4-3), otherwise finish option program;
(3-4-4), select solid black circle mark edge three point coordinates (
Figure 374389DEST_PATH_IMAGE031
;
Figure 256895DEST_PATH_IMAGE032
), (
Figure 609379DEST_PATH_IMAGE033
;
Figure 286348DEST_PATH_IMAGE034
), (
Figure 724282DEST_PATH_IMAGE035
;
Figure 722063DEST_PATH_IMAGE036
) central coordinate of circle (
Figure 929053DEST_PATH_IMAGE047
;
Figure 42503DEST_PATH_IMAGE048
), the method for employing is following:
Whether the central coordinate of circle of judging solid black circle mark image meets the following conditions simultaneously:
Figure 967733DEST_PATH_IMAGE058
And
Figure 254358DEST_PATH_IMAGE059
And
Figure 581434DEST_PATH_IMAGE060
If satisfy; Then select the central coordinate of circle of solid black circle mark image to be ( ;
Figure 825782DEST_PATH_IMAGE048
); Change step (4), otherwise finish option program.
The described chromatography deviation that calculates the central coordinate of circle of yellow circular ring marks image, magenta circular ring marks image, cyan circular ring marks image with respect to solid black circle mark central coordinate of circle respectively of above-mentioned steps (4), its concrete steps are following:
(4-1), yellow circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of yellow circular ring marks image with respect to the central coordinate of circle of solid black circle mark image is set, and its calculation expression is respectively:
Figure 853781DEST_PATH_IMAGE061
=
Figure 35364DEST_PATH_IMAGE062
Figure 490616DEST_PATH_IMAGE063
=
Figure 452756DEST_PATH_IMAGE064
Wherein:
Figure 18866DEST_PATH_IMAGE061
,
Figure 54955DEST_PATH_IMAGE063
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of yellow circular ring marks image with respect to the central coordinate of circle of solid black circle mark image; (
Figure 681109DEST_PATH_IMAGE047
;
Figure 114233DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image; (
Figure 484034DEST_PATH_IMAGE041
,
Figure 640209DEST_PATH_IMAGE042
) is the central coordinate of circle of yellow circular ring marks image;
(4-2), magenta circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of magenta circular ring marks image with respect to the central coordinate of circle of solid black circle mark image is set, and its calculation expression is respectively:
=
Figure 108417DEST_PATH_IMAGE043
-
Figure 27011DEST_PATH_IMAGE066
=
Figure 994967DEST_PATH_IMAGE067
Wherein: ,
Figure 615752DEST_PATH_IMAGE066
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of magenta circular ring marks image with respect to the central coordinate of circle of solid black circle mark image; (
Figure 746520DEST_PATH_IMAGE047
;
Figure 885377DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image; (
Figure 203226DEST_PATH_IMAGE043
,
Figure 780838DEST_PATH_IMAGE044
) is the central coordinate of circle of magenta circular ring marks image;
(4-3), cyan circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of cyan circular ring marks image with respect to the central coordinate of circle of solid black circle mark image is set, and its calculation expression is respectively:
Figure 766111DEST_PATH_IMAGE068
=
Figure 75870DEST_PATH_IMAGE045
-
Figure 881015DEST_PATH_IMAGE047
Figure 246006DEST_PATH_IMAGE069
=
Figure 85786DEST_PATH_IMAGE070
Wherein:
Figure 566446DEST_PATH_IMAGE068
,
Figure 124466DEST_PATH_IMAGE069
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of cyan circular ring marks image with respect to the central coordinate of circle of solid black circle mark image; (
Figure 778301DEST_PATH_IMAGE047
;
Figure 738167DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image; (
Figure 389728DEST_PATH_IMAGE045
,
Figure 169465DEST_PATH_IMAGE046
) is the central coordinate of circle of cyan circular ring marks image.
Above-mentioned steps (5) is described respectively with transverse axis chromatography deviation square value, longitudinal axis chromatography deviation square value and transverse axis deviation tolerance, longitudinal axis deviation tolerance relatively, draws the transverse axis chromatography deviation square value that exceeds transverse axis deviation tolerance, the longitudinal axis chromatography deviation square value that exceeds longitudinal axis deviation tolerance respectively; Its concrete steps are following:
(5-1), with transverse axis chromatography deviation square value and transverse axis deviation tolerance relatively, obtain exceeding the transverse axis chromatography deviation square value of transverse axis deviation tolerance, the employing method is following:
If transverse axis deviation tolerance is
Figure 564675DEST_PATH_IMAGE071
; Its scope does;
Figure 192096DEST_PATH_IMAGE072
; With the square value
Figure 480492DEST_PATH_IMAGE075
of the transverse axis deviation of the square value
Figure 281592DEST_PATH_IMAGE074
of the transverse axis deviation of the square value
Figure 14559DEST_PATH_IMAGE073
of the transverse axis deviation of yellow marking image, magenta marking image, cyan marking image respectively with the transverse axis deviation tolerance of image relatively; If the while is smaller or equal to the transverse axis deviation tolerance
Figure 205052DEST_PATH_IMAGE071
of image; That is, satisfy following condition simultaneously: ; And
Figure 961972DEST_PATH_IMAGE077
; And
Figure 796942DEST_PATH_IMAGE078
then finishes comparison program; If transverse axis deviation tolerance
Figure 961207DEST_PATH_IMAGE071
greater than image; That is, satisfy following condition:
Figure 202832DEST_PATH_IMAGE079
; Or ; Or ; Then obtain exceeding the transverse axis chromatography deviation square value of transverse axis deviation tolerance, change step (6);
(5-2), with longitudinal axis chromatography deviation square value and longitudinal axis deviation tolerance relatively, obtain exceeding the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance, the employing method is following:
If longitudinal axis deviation tolerance is ; Its scope does;
Figure 247832DEST_PATH_IMAGE083
; With the square value
Figure 409320DEST_PATH_IMAGE086
of the longitudinal axis deviation of the square value
Figure 637673DEST_PATH_IMAGE085
of the longitudinal axis deviation of the square value of the longitudinal axis deviation of yellow marking image, magenta marking image, cyan marking image respectively with the longitudinal axis deviation tolerance
Figure 359958DEST_PATH_IMAGE082
of image relatively; If the while is smaller or equal to the longitudinal axis deviation tolerance
Figure 242464DEST_PATH_IMAGE082
of image; That is, satisfy following condition simultaneously:
Figure 657264DEST_PATH_IMAGE087
; And
Figure 599813DEST_PATH_IMAGE088
; And
Figure 37747DEST_PATH_IMAGE089
then finishes comparison program; If longitudinal axis deviation tolerance
Figure 723943DEST_PATH_IMAGE082
greater than image; That is, satisfy following condition:
Figure 242518DEST_PATH_IMAGE090
; Or ; Or
Figure 281199DEST_PATH_IMAGE092
; Then obtain exceeding the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance, change step (6);
A kind of machine vision detection method based on four look printing alignment certification marks of the present invention has following advantage:
This method is because preset four look printing alignment certification marks are the centers of circle of adopting yellow circular ring marks figure, magenta circular ring marks figure, cyan circular ring marks figure; And be same concentric annulus figure with the center of circle respectively, be convenient to industrial camera and accurately take fast with solid black circle mark figure; This method only need calculate the chromatography deviation of the central coordinate of circle of yellow circular ring marks image, magenta circular ring marks image, cyan circular ring marks image with respect to solid black mark central coordinate of circle, and detection speed is fast, and testing result is directly perceived, and detection efficiency is high; This method can directly append on the printing production line, realizes printing online in real time high speed detection.
Description of drawings
Fig. 1 is the flow chart of a kind of machine vision detection method based on four look printing alignment certification marks of the present invention;
Fig. 2 is the sketch map of the figure of the preset four look printing alignment certification marks that the present invention adopted;
Fig. 3 is the sketch map of the central coordinate of circle of the yellow circular ring marks image described in the step 4 of the present invention, magenta circular ring marks image, cyan circular ring marks image with respect to the chromatography deviation of solid black mark central coordinate of circle.
The specific embodiment
For the ease of understanding, combine accompanying drawing that the present invention is done further to set forth in detail at present.
As shown in Figure 1, of the present invention OnePlant the machine vision detection method based on four look printing alignment certification marks, this detection method comprises following step:
(1), the figure of preset four look printing alignment certification marks
As shown in Figure 2; Among the figure; Transverse axis is represented the x axle; The longitudinal axis is represented the y axle; The figure of four look printing alignment certification marks is: solid black circle mark figure P4, yellow circular ring marks figure P1, magenta circular ring marks figure P2, cyan circular ring marks figure P3 are the benchmark of alignment certification mark with the center of circle of solid black circle mark figure P4, and the center of circle of yellow circular ring marks figure P1, magenta circular ring marks figure P2, cyan circular ring marks figure P3 is the same center of circle with the center of circle of solid black circle mark figure P4 respectively;
(2), gather the image of preset alignment certification mark figure, this image is sent to computer system;
In printing process, utilize four preset in the industrial camera acquisition step (1) look printing alignment certification mark figures, obtain four look printing alignment certification mark images, this image is sent to computer system;
(3), obtain the central coordinate of circle of the alignment certification mark in the four look printing alignment certification mark images respectively;
Four look printing alignment certification mark images to reading in the step (2) in the computer system adopt following method to obtain the central coordinate of circle of yellow circular ring marks image P1, the central coordinate of circle of magenta circular ring marks image P2, the central coordinate of circle of cyan circular ring marks image P3 and the central coordinate of circle of solid black circle mark image P4 respectively, and its concrete steps are following:
(3-1), adopt vectorial median filter method to carry out filtering to the four look printing alignment certification mark images that read in the computer system; Obtain filtered four look printing alignment certification mark image I MAGE1, this image I MAGE1 is converted into four look printing alignment certification mark gray level image IMAGE2;
(3-2) four look printing alignment certification mark gray level image IMAGE2 are carried out edge extracting, obtain yellow circular ring marks image border, magenta circular ring marks image border, cyan circular ring marks image border and density bullet image border;
(3-3), three point coordinates, three point coordinates on the magenta circular ring marks image border, three point coordinates on the cyan circular ring marks image border and three point coordinates on the density bullet image border on the described yellow circular ring marks of step (3-2) image border are set respectively; Judge three above-mentioned point coordinates respectively not on same straight line, its concrete steps are following::
Three point coordinates that (3-3-1), are provided with on the described yellow circular ring marks of above-mentioned steps (3-2) image border are (
Figure 505507DEST_PATH_IMAGE001
;
Figure 894900DEST_PATH_IMAGE002
), (
Figure 913671DEST_PATH_IMAGE003
; ), (
Figure 354197DEST_PATH_IMAGE005
, );
Coordinate on the then yellow circular ring marks image border (
Figure 804081DEST_PATH_IMAGE001
;
Figure 438325DEST_PATH_IMAGE002
) with yellow circular ring marks image border on coordinate (
Figure 4435DEST_PATH_IMAGE003
;
Figure 306103DEST_PATH_IMAGE004
) straight slope be
Figure 994574DEST_PATH_IMAGE007
, its expression formula is:
Figure 116113DEST_PATH_IMAGE007
?=
Figure 485915DEST_PATH_IMAGE008
Coordinate on the then yellow circular ring marks image border (
Figure 642090DEST_PATH_IMAGE001
;
Figure 750729DEST_PATH_IMAGE002
) with yellow circular ring marks image border on coordinate (
Figure 359565DEST_PATH_IMAGE005
;
Figure 267478DEST_PATH_IMAGE006
) straight slope
Figure 278159DEST_PATH_IMAGE009
, its expression formula is:
Figure 308432DEST_PATH_IMAGE009
?=
Figure 404564DEST_PATH_IMAGE010
Judge above-mentioned straight slope
Figure 116168DEST_PATH_IMAGE007
With straight slope
Figure 981356DEST_PATH_IMAGE009
Whether unequal, if unequal, three point coordinates on the above-mentioned yellow circular ring marks edge (
Figure 933263DEST_PATH_IMAGE001
,
Figure 516691DEST_PATH_IMAGE002
), (
Figure 31986DEST_PATH_IMAGE003
,
Figure 751680DEST_PATH_IMAGE004
), (
Figure 61439DEST_PATH_IMAGE005
,
Figure 194480DEST_PATH_IMAGE006
) be not on same straight line, then change step (3-4), otherwise finish determining program
Three point coordinates that (3-3-2), are provided with on the described magenta circular ring marks of above-mentioned steps (3-2) edge are (
Figure 247886DEST_PATH_IMAGE011
;
Figure 87666DEST_PATH_IMAGE012
), (
Figure 568326DEST_PATH_IMAGE013
; ), (
Figure 29449DEST_PATH_IMAGE015
,
Figure 723736DEST_PATH_IMAGE016
);
The coordinate on the magenta circular ring marks edge (
Figure 640876DEST_PATH_IMAGE011
then;
Figure 482930DEST_PATH_IMAGE012
) with magenta circular ring marks edge on coordinate (
Figure 878140DEST_PATH_IMAGE013
;
Figure 692512DEST_PATH_IMAGE014
) straight slope be
Figure 514974DEST_PATH_IMAGE017
, its expression formula is:
Figure 595057DEST_PATH_IMAGE017
?=
Figure 793957DEST_PATH_IMAGE018
The coordinate on the magenta circular ring marks edge (
Figure 462836DEST_PATH_IMAGE011
then;
Figure 456200DEST_PATH_IMAGE012
) with magenta circular ring marks edge on coordinate (
Figure 272846DEST_PATH_IMAGE015
;
Figure 9858DEST_PATH_IMAGE016
) straight slope be
Figure 533243DEST_PATH_IMAGE019
, its expression formula is:
?=
Figure 204713DEST_PATH_IMAGE020
Judge above-mentioned straight slope
Figure 791421DEST_PATH_IMAGE017
With straight slope
Figure 434892DEST_PATH_IMAGE019
Whether unequal, if unequal, three point coordinates on the above-mentioned magenta circular ring marks edge ( ,
Figure 498980DEST_PATH_IMAGE012
), ( ,
Figure 138089DEST_PATH_IMAGE014
), (
Figure 909736DEST_PATH_IMAGE015
,
Figure 860374DEST_PATH_IMAGE016
) be not on same straight line, then change step (3-4), otherwise finish determining program
Three point coordinates that (3-3-3), are provided with on the described cyan circular ring marks of above-mentioned steps (3-2) image border are (
Figure 555929DEST_PATH_IMAGE021
;
Figure 908413DEST_PATH_IMAGE022
), (
Figure 850961DEST_PATH_IMAGE023
;
Figure 288895DEST_PATH_IMAGE024
), (
Figure 771829DEST_PATH_IMAGE025
,
Figure 244399DEST_PATH_IMAGE026
);
The coordinate on the cyan circular ring marks image border (
Figure 357849DEST_PATH_IMAGE021
then;
Figure 283079DEST_PATH_IMAGE022
) with cyan circular ring marks image border on coordinate (
Figure 507387DEST_PATH_IMAGE023
;
Figure 880469DEST_PATH_IMAGE024
) straight slope be
Figure 164819DEST_PATH_IMAGE027
, its expression formula is:
Figure 577346DEST_PATH_IMAGE027
?=
Figure 605345DEST_PATH_IMAGE028
The coordinate on the cyan circular ring marks image border (
Figure 849245DEST_PATH_IMAGE021
then;
Figure 38917DEST_PATH_IMAGE022
) with cyan circular ring marks image border on coordinate (
Figure 938740DEST_PATH_IMAGE025
;
Figure 504851DEST_PATH_IMAGE026
) straight slope be
Figure 619569DEST_PATH_IMAGE029
, its expression formula is:
Figure 980143DEST_PATH_IMAGE029
?=
Figure 367262DEST_PATH_IMAGE030
Judge above-mentioned straight slope
Figure 737063DEST_PATH_IMAGE027
With straight slope
Figure 689976DEST_PATH_IMAGE029
Whether unequal, if unequal, three point coordinates on the above-mentioned cyan circular ring marks image border (
Figure 487030DEST_PATH_IMAGE021
,
Figure 95866DEST_PATH_IMAGE022
), (
Figure 269359DEST_PATH_IMAGE023
,
Figure 591624DEST_PATH_IMAGE024
), (
Figure 559580DEST_PATH_IMAGE025
,
Figure 655712DEST_PATH_IMAGE026
) be not on same straight line, then change step (3-4), otherwise finish determining program
Three point coordinates that (3-3-4), are provided with on the described solid black circle mark of above-mentioned steps (3-2) image border are (
Figure 367316DEST_PATH_IMAGE031
;
Figure 294821DEST_PATH_IMAGE032
), (
Figure 433679DEST_PATH_IMAGE033
;
Figure 17107DEST_PATH_IMAGE034
), ( ,
Figure 65145DEST_PATH_IMAGE036
);
The coordinate on the solid black circle mark image border (
Figure 374904DEST_PATH_IMAGE031
then;
Figure 445628DEST_PATH_IMAGE032
) with solid black circle mark image border on coordinate (
Figure 561352DEST_PATH_IMAGE033
;
Figure 401132DEST_PATH_IMAGE034
) straight slope be
Figure 881791DEST_PATH_IMAGE037
, its expression formula is:
Figure 174233DEST_PATH_IMAGE037
?=
Figure 944431DEST_PATH_IMAGE038
The coordinate on the solid black circle mark image border (
Figure 638718DEST_PATH_IMAGE031
then; ) with solid black circle mark image border on coordinate (( ;
Figure 793122DEST_PATH_IMAGE036
) straight slope
Figure 341915DEST_PATH_IMAGE039
, its expression formula is:
Figure 429956DEST_PATH_IMAGE039
?=
Figure 696990DEST_PATH_IMAGE040
Confirm above-mentioned straight slope
Figure 708939DEST_PATH_IMAGE037
With straight slope
Figure 112239DEST_PATH_IMAGE039
Whether unequal, if unequal, three point coordinates on the above-mentioned solid black circle mark image border (
Figure 371182DEST_PATH_IMAGE031
,
Figure 125511DEST_PATH_IMAGE032
), ( ,
Figure 448225DEST_PATH_IMAGE034
), (
Figure 878069DEST_PATH_IMAGE035
,
Figure 854116DEST_PATH_IMAGE036
) not on same straight line, then change step (3-4), otherwise finish determining program ,
(3-4), according to three point coordinates on the described definite yellow circular ring marks image border of step (3-3), three point coordinates on the magenta circular ring marks image border, the central coordinate of circle (
Figure 706403DEST_PATH_IMAGE041
that three point coordinates and three point coordinates on the density bullet image border on the cyan circular ring marks image border are selected yellow circular ring marks;
Figure 349874DEST_PATH_IMAGE042
), the central coordinate of circle (
Figure 685040DEST_PATH_IMAGE043
of magenta circular ring marks;
Figure 413962DEST_PATH_IMAGE044
), the central coordinate of circle (
Figure 555093DEST_PATH_IMAGE045
of cyan circular ring marks image;
Figure 53070DEST_PATH_IMAGE046
), the central coordinate of circle (
Figure 559138DEST_PATH_IMAGE047
,
Figure 775356DEST_PATH_IMAGE048
) of solid black circle mark image
(3-4-1) three point coordinates ( on the yellow circular ring marks of the selection image border;
Figure 823394DEST_PATH_IMAGE002
), (
Figure 765943DEST_PATH_IMAGE003
;
Figure 266194DEST_PATH_IMAGE004
), (
Figure 686811DEST_PATH_IMAGE005
; ) central coordinate of circle (
Figure 7251DEST_PATH_IMAGE041
;
Figure 244066DEST_PATH_IMAGE042
), the method for employing is following:
Whether the central coordinate of circle of judging yellow circular ring marks image meets the following conditions simultaneously:
Figure 468374DEST_PATH_IMAGE049
And
Figure 795450DEST_PATH_IMAGE050
And
If satisfy; Then select the central coordinate of circle of yellow circular ring marks image to be ( ;
Figure 317065DEST_PATH_IMAGE042
); Change step (4-1), otherwise finish option program;
(3-4-2), red circular ring marks edge three point coordinates (
Figure 498647DEST_PATH_IMAGE011
of selection; ), (
Figure 666771DEST_PATH_IMAGE013
;
Figure 232882DEST_PATH_IMAGE014
), (
Figure 268971DEST_PATH_IMAGE015
;
Figure 895125DEST_PATH_IMAGE016
) central coordinate of circle (
Figure 344560DEST_PATH_IMAGE043
;
Figure 448783DEST_PATH_IMAGE044
), the method for employing is following:
Whether the central coordinate of circle of judging magenta circular ring marks image meets the following conditions simultaneously:
And
And
If satisfy; Then select the central coordinate of circle of yellow circular ring marks image to be (
Figure 495925DEST_PATH_IMAGE041
;
Figure 506606DEST_PATH_IMAGE042
); Change step (4-2), otherwise finish option program;
(3-4-3), select cyan circular ring marks edge three point coordinates (
Figure 474562DEST_PATH_IMAGE021
;
Figure 633011DEST_PATH_IMAGE022
), (
Figure 79036DEST_PATH_IMAGE023
;
Figure 209803DEST_PATH_IMAGE024
), (
Figure 348660DEST_PATH_IMAGE025
;
Figure 745138DEST_PATH_IMAGE026
) central coordinate of circle ( ; ), the method for employing is following:
Whether the central coordinate of circle of judging cyan circular ring marks image meets the following conditions simultaneously:
Figure 289886DEST_PATH_IMAGE055
And
Figure 360610DEST_PATH_IMAGE056
And
If satisfy; Then select the central coordinate of circle of yellow circular ring marks image to be (
Figure 316113DEST_PATH_IMAGE041
;
Figure 796773DEST_PATH_IMAGE042
); Change step (4-3), otherwise finish option program;
(3-4-4), select solid black circle mark image border three point coordinates (
Figure 89214DEST_PATH_IMAGE031
;
Figure 257896DEST_PATH_IMAGE032
), (
Figure 952183DEST_PATH_IMAGE033
;
Figure 603744DEST_PATH_IMAGE034
), (
Figure 649061DEST_PATH_IMAGE035
;
Figure 106587DEST_PATH_IMAGE036
) central coordinate of circle (
Figure 655380DEST_PATH_IMAGE047
;
Figure 743421DEST_PATH_IMAGE048
), the method for employing is following:
Whether the central coordinate of circle of judging solid black circle mark image meets the following conditions simultaneously:
Figure 10455DEST_PATH_IMAGE058
And
Figure 756825DEST_PATH_IMAGE059
And
Figure 425704DEST_PATH_IMAGE060
If satisfy, then select the central coordinate of circle of yellow circular ring marks image to be (
Figure 684647DEST_PATH_IMAGE041
,
Figure 173397DEST_PATH_IMAGE042
), change step (4-1), otherwise finish option program
(4), respectively calculate the chromatography deviation of the central coordinate of circle of yellow circular ring marks image P1, magenta circular ring marks image P2, cyan circular ring marks image P3 with respect to solid black circle mark image P4 central coordinate of circle, as shown in Figure 3, its concrete steps are following:
(4-1), yellow circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of yellow circular ring marks image P1 with respect to the central coordinate of circle of density bullet image P4 is set, and its calculation expression is respectively:
Figure 175988DEST_PATH_IMAGE061
=
Figure 761690DEST_PATH_IMAGE062
Figure 925955DEST_PATH_IMAGE063
=
Figure 167581DEST_PATH_IMAGE064
Wherein:
Figure 708283DEST_PATH_IMAGE061
,
Figure 397760DEST_PATH_IMAGE063
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of yellow circular ring marks image P1 with respect to the central coordinate of circle of density bullet image P4; (
Figure 998505DEST_PATH_IMAGE047
;
Figure 461848DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image P4; (
Figure 806241DEST_PATH_IMAGE041
,
Figure 366536DEST_PATH_IMAGE042
) is the central coordinate of circle of yellow circular ring marks image P1;
(4-2), magenta circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of magenta circular ring marks image P2 with respect to the central coordinate of circle of density bullet image P4 is set, and its calculation expression is respectively:
Figure 872603DEST_PATH_IMAGE065
=
Figure 88821DEST_PATH_IMAGE043
-
Figure 971326DEST_PATH_IMAGE047
Figure 136860DEST_PATH_IMAGE066
=
Figure 813829DEST_PATH_IMAGE067
Wherein:
Figure 251763DEST_PATH_IMAGE065
,
Figure 937959DEST_PATH_IMAGE066
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of magenta circular ring marks image P2 with respect to the central coordinate of circle of reference black marking image P4; (
Figure 144950DEST_PATH_IMAGE047
;
Figure 320716DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image P4; (
Figure 245947DEST_PATH_IMAGE043
,
Figure 470255DEST_PATH_IMAGE044
) is the central coordinate of circle of magenta circular ring marks image P2;
4-3), cyan circular ring marks chromatography deviation approach being set is:
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of cyan circular ring marks image P3 with respect to the central coordinate of circle of density bullet image P4 is set, and its calculation expression is respectively:
Figure 797331DEST_PATH_IMAGE068
= -
=
Figure 749795DEST_PATH_IMAGE070
Wherein:
Figure 267364DEST_PATH_IMAGE068
,
Figure 167187DEST_PATH_IMAGE069
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of cyan circular ring marks image P3 with respect to the central coordinate of circle of reference black marking image P4; (
Figure 733298DEST_PATH_IMAGE047
;
Figure 769387DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image P4; (
Figure 208590DEST_PATH_IMAGE045
,
Figure 330129DEST_PATH_IMAGE046
) is the central coordinate of circle of cyan circular ring marks image P3;
(5), respectively relatively, with transverse axis chromatography deviation square value, longitudinal axis chromatography deviation square value and transverse axis deviation tolerance, longitudinal axis deviation tolerance obtain respectively exceeding transverse axis deviation tolerance transverse axis chromatography deviation square value, exceed the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance; Its concrete steps are following:
(5-1), with transverse axis chromatography deviation square value and transverse axis deviation tolerance relatively, obtain exceeding the transverse axis chromatography deviation square value of transverse axis deviation tolerance, the employing method is following:
If transverse axis deviation tolerance is
Figure 699931DEST_PATH_IMAGE071
; Its scope does;
Figure 856106DEST_PATH_IMAGE072
; With the square value
Figure 232226DEST_PATH_IMAGE075
of the transverse axis deviation of the square value
Figure 324313DEST_PATH_IMAGE074
of the transverse axis deviation of the square value
Figure 653160DEST_PATH_IMAGE073
of the transverse axis deviation of yellow marking image, magenta marking image, cyan marking image respectively with the transverse axis deviation tolerance
Figure 242908DEST_PATH_IMAGE071
of image relatively; If the while is smaller or equal to the transverse axis deviation tolerance
Figure 210864DEST_PATH_IMAGE071
of image; That is, satisfy following condition simultaneously:
Figure 618580DEST_PATH_IMAGE076
; And
Figure 330184DEST_PATH_IMAGE077
; And
Figure 460951DEST_PATH_IMAGE078
then finishes comparison program; If transverse axis deviation tolerance
Figure 599809DEST_PATH_IMAGE071
greater than image; That is, satisfy following condition:
Figure 979974DEST_PATH_IMAGE079
; Or
Figure 495269DEST_PATH_IMAGE080
; Or ; Then obtain exceeding the transverse axis chromatography deviation square value of transverse axis deviation tolerance, change step (6);
(5-2), with longitudinal axis chromatography deviation square value and longitudinal axis deviation tolerance relatively, obtain exceeding the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance, the employing method is following:
If longitudinal axis deviation tolerance is ; Its scope does;
Figure 408496DEST_PATH_IMAGE083
; With the square value
Figure 782342DEST_PATH_IMAGE086
of the longitudinal axis deviation of the square value
Figure 301682DEST_PATH_IMAGE085
of the longitudinal axis deviation of the square value
Figure 461902DEST_PATH_IMAGE084
of the longitudinal axis deviation of yellow marking image, magenta marking image, cyan marking image respectively with the longitudinal axis deviation tolerance
Figure 402680DEST_PATH_IMAGE082
of image relatively; If the while is smaller or equal to the longitudinal axis deviation tolerance
Figure 994198DEST_PATH_IMAGE082
of image; That is, satisfy following condition simultaneously:
Figure 954064DEST_PATH_IMAGE087
; And
Figure 605625DEST_PATH_IMAGE088
; And then finishes comparison program; If longitudinal axis deviation tolerance
Figure 92156DEST_PATH_IMAGE082
greater than image; That is, satisfy following condition:
Figure 906528DEST_PATH_IMAGE090
; Or
Figure 728990DEST_PATH_IMAGE091
; Or
Figure 996024DEST_PATH_IMAGE092
; Then obtain exceeding the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance, change step (6);
(6), respectively the central coordinate of circle of the described yellow circular ring marks image of step (4), magenta circular ring marks image, cyan circular ring marks image is outputed to the deviation repairing mechanism with respect to the described transverse axis chromatography deviation square value that exceeds transverse axis deviation tolerance of the chromatography deviation of solid black circle mark image central coordinate of circle and step (5), the longitudinal axis chromatography deviation square value that exceeds longitudinal axis deviation tolerance and carry out the deviation reparation.

Claims (5)

1. the machine vision detection method based on four look printing alignment certification marks specifically comprises the steps:
(1), the figure of preset four look printing alignment certification marks;
(2), gather the image of preset alignment certification mark figure, this image is sent to computer system;
(3), obtain the central coordinate of circle of the alignment certification mark in the four look printing alignment certification mark images respectively;
(4), calculate the chromatography deviation of the central coordinate of circle of yellow circular ring marks image, magenta circular ring marks image, cyan circular ring marks image respectively with respect to solid black circle mark image central coordinate of circle;
(5), respectively relatively, with transverse axis chromatography deviation square value, longitudinal axis chromatography deviation square value and transverse axis deviation tolerance, longitudinal axis deviation tolerance obtain respectively exceeding transverse axis deviation tolerance transverse axis chromatography deviation square value, exceed the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance;
(6), respectively the central coordinate of circle of the described yellow circular ring marks image of step (4), magenta circular ring marks image, cyan circular ring marks image is outputed to the deviation repairing mechanism with respect to the described transverse axis chromatography deviation square value that exceeds transverse axis deviation tolerance of the chromatography deviation of solid black circle mark image central coordinate of circle and step (5), the longitudinal axis chromatography deviation square value that exceeds longitudinal axis deviation tolerance and carry out the deviation reparation.
2. a kind of machine vision detection method according to claim 1 based on four look printing alignment certification marks; It is characterized in that; The figure of the described preset four look printing alignment certification marks of above-mentioned steps (1) comprises: solid black circle mark figure, yellow circular ring marks figure, magenta circular ring marks figure, cyan circular ring marks figure; The center of circle with solid black circle mark figure is the benchmark of alignment certification mark, and the center of circle of yellow circular ring marks figure, magenta circular ring marks figure, cyan circular ring marks figure is the same center of circle with the center of circle of solid black circle mark figure respectively.
3. a kind of machine vision detection method according to claim 2 based on four look printing alignment certification marks; It is characterized in that; The described central coordinate of circle that obtains the alignment certification mark in the four look printing alignment certification mark images respectively of above-mentioned steps (3), its concrete steps are following:
(3-1), adopt vectorial median filter method to carry out filtering to the four look printing alignment certification mark images that read in the computer system; Obtain filtered four look printing alignment certification mark image I MAGE1, this image I MAGE1 is converted into four look printing alignment certification mark gray level image IMAGE2;
(3-2), four look printing alignment certification mark gray level image IMAGE2 are carried out edge extracting, obtain yellow circular ring marks image border, magenta circular ring marks image border, cyan circular ring marks image border and solid black circle mark image border;
(3-3), three point coordinates, three point coordinates on the magenta circular ring marks image border, three point coordinates on the cyan circular ring marks image border and three point coordinates on the solid black circle mark image border on the described yellow circular ring marks of step (3-2) image border are set respectively; Judge three above-mentioned point coordinates respectively not on same straight line, its concrete steps are following:
Three point coordinates that (3-3-1), are provided with on the described yellow circular ring marks of above-mentioned steps (3-2) image border are (
Figure 118474DEST_PATH_IMAGE001
; ), (
Figure 279514DEST_PATH_IMAGE003
;
Figure 999208DEST_PATH_IMAGE004
), (
Figure 308967DEST_PATH_IMAGE005
,
Figure 691275DEST_PATH_IMAGE006
);
Coordinate on the then yellow circular ring marks image border (
Figure 744682DEST_PATH_IMAGE001
;
Figure 646779DEST_PATH_IMAGE002
) with yellow circular ring marks image border on coordinate (
Figure 127439DEST_PATH_IMAGE003
;
Figure 685459DEST_PATH_IMAGE004
) straight slope be
Figure 90027DEST_PATH_IMAGE007
, its expression formula is:
Figure 784313DEST_PATH_IMAGE007
?=
Figure 701454DEST_PATH_IMAGE008
Coordinate on the then yellow circular ring marks image border ( ;
Figure 938717DEST_PATH_IMAGE002
) with yellow circular ring marks image border on coordinate (
Figure 753089DEST_PATH_IMAGE005
;
Figure 723074DEST_PATH_IMAGE006
) straight slope be , its expression formula is:
Figure 251324DEST_PATH_IMAGE009
?=
Figure 920203DEST_PATH_IMAGE010
Judge above-mentioned straight slope
Figure 913567DEST_PATH_IMAGE007
With straight slope Whether unequal, if unequal, three point coordinates on the above-mentioned yellow circular ring marks edge (
Figure 217957DEST_PATH_IMAGE001
,
Figure 741342DEST_PATH_IMAGE002
), (
Figure 233504DEST_PATH_IMAGE003
,
Figure 475129DEST_PATH_IMAGE004
), (
Figure 750253DEST_PATH_IMAGE005
,
Figure 705308DEST_PATH_IMAGE006
) be not on same straight line, then change step (3-4), otherwise finish determining program
Three point coordinates that (3-3-2), are provided with on the described magenta circular ring marks of above-mentioned steps (3-2) edge are (
Figure 40475DEST_PATH_IMAGE011
;
Figure 831713DEST_PATH_IMAGE012
), (
Figure 910527DEST_PATH_IMAGE013
;
Figure 408505DEST_PATH_IMAGE014
), (
Figure 993201DEST_PATH_IMAGE015
,
Figure 943840DEST_PATH_IMAGE016
);
The coordinate on the magenta circular ring marks edge (
Figure 888662DEST_PATH_IMAGE011
then;
Figure 241146DEST_PATH_IMAGE012
) with magenta circular ring marks edge on coordinate (
Figure 495278DEST_PATH_IMAGE013
;
Figure 933213DEST_PATH_IMAGE014
) straight slope be
Figure 416147DEST_PATH_IMAGE017
, its expression formula is:
Figure 888717DEST_PATH_IMAGE017
?=
Figure 815215DEST_PATH_IMAGE018
The coordinate on the magenta circular ring marks edge (
Figure 740446DEST_PATH_IMAGE011
then;
Figure 964754DEST_PATH_IMAGE012
), with magenta circular ring marks edge on coordinate (
Figure 88568DEST_PATH_IMAGE015
; ) straight slope be
Figure 97030DEST_PATH_IMAGE019
, its expression formula is:
Figure 125029DEST_PATH_IMAGE019
?=
Figure 368928DEST_PATH_IMAGE020
Judge whether above-mentioned straight slope and straight slope
Figure 458424DEST_PATH_IMAGE019
be unequal; If it is unequal; Three point coordinates on the above-mentioned magenta circular ring marks edge (
Figure 837584DEST_PATH_IMAGE011
; ), (
Figure 562143DEST_PATH_IMAGE013
;
Figure 949262DEST_PATH_IMAGE014
), (
Figure 630648DEST_PATH_IMAGE015
;
Figure 521244DEST_PATH_IMAGE016
) be not on same straight line, then change step
(3-4), otherwise finish determining program;
Three point coordinates that (3-3-3), are provided with on the described cyan circular ring marks of above-mentioned steps (3-2) image border are (
Figure 380616DEST_PATH_IMAGE021
;
Figure 989451DEST_PATH_IMAGE022
), ( ;
Figure 986674DEST_PATH_IMAGE024
), (
Figure 954630DEST_PATH_IMAGE025
,
Figure 50762DEST_PATH_IMAGE026
);
The coordinate on the cyan circular ring marks image border (
Figure 824683DEST_PATH_IMAGE021
then;
Figure 689871DEST_PATH_IMAGE022
) with cyan circular ring marks image border on coordinate (
Figure 828729DEST_PATH_IMAGE023
;
Figure 412157DEST_PATH_IMAGE024
) straight slope be
Figure 973457DEST_PATH_IMAGE027
, its expression formula is:
Figure 958730DEST_PATH_IMAGE027
?=
Figure 268489DEST_PATH_IMAGE028
The coordinate on the cyan circular ring marks image border (
Figure 401530DEST_PATH_IMAGE021
then;
Figure 454937DEST_PATH_IMAGE022
) with cyan circular ring marks image border on coordinate (
Figure 294717DEST_PATH_IMAGE025
;
Figure 588426DEST_PATH_IMAGE026
) straight slope be
Figure 880867DEST_PATH_IMAGE029
, its expression formula is:
Figure 737965DEST_PATH_IMAGE029
?=
Judge whether above-mentioned straight slope
Figure 146129DEST_PATH_IMAGE027
and straight slope
Figure 191446DEST_PATH_IMAGE029
be unequal; If it is unequal; Three point coordinates on the above-mentioned cyan circular ring marks image border (
Figure 898239DEST_PATH_IMAGE021
;
Figure 447032DEST_PATH_IMAGE022
), (
Figure 535074DEST_PATH_IMAGE023
;
Figure 864424DEST_PATH_IMAGE024
), (
Figure 63324DEST_PATH_IMAGE025
;
Figure 466624DEST_PATH_IMAGE026
) be not on same straight line; Then change step (3-4), otherwise finish determining program;
Three point coordinates that (3-3-4), are provided with on the described solid black circle mark of above-mentioned steps (3-2) image border are ( ; ), (
Figure 29958DEST_PATH_IMAGE033
;
Figure 553343DEST_PATH_IMAGE034
), (
Figure 983187DEST_PATH_IMAGE035
,
Figure 21550DEST_PATH_IMAGE036
);
The coordinate on the solid black circle mark image border (
Figure 562253DEST_PATH_IMAGE031
then;
Figure 205724DEST_PATH_IMAGE032
) with solid black circle mark image border on coordinate (
Figure 540890DEST_PATH_IMAGE033
;
Figure 581396DEST_PATH_IMAGE034
) straight slope be
Figure 660211DEST_PATH_IMAGE037
, its expression formula is:
Figure 158188DEST_PATH_IMAGE037
?=
Figure 726573DEST_PATH_IMAGE038
The coordinate on the solid black circle mark edge (
Figure 942791DEST_PATH_IMAGE031
then;
Figure 825296DEST_PATH_IMAGE032
) with solid black circle mark image border on coordinate (
Figure 177780DEST_PATH_IMAGE035
;
Figure 933377DEST_PATH_IMAGE036
) straight slope be
Figure 371312DEST_PATH_IMAGE039
, its expression formula is:
Figure 791929DEST_PATH_IMAGE039
?=
Figure 264499DEST_PATH_IMAGE040
Confirm whether above-mentioned straight slope and straight slope
Figure 99917DEST_PATH_IMAGE039
be unequal; If it is unequal; Three point coordinates on the above-mentioned solid black circle mark image border (
Figure 324224DEST_PATH_IMAGE031
;
Figure 651301DEST_PATH_IMAGE032
), ( ;
Figure 659763DEST_PATH_IMAGE034
), (
Figure 422182DEST_PATH_IMAGE035
;
Figure 603765DEST_PATH_IMAGE036
) not on same straight line; Then change step (3-4), otherwise finish determining program;
(3-4), according to three point coordinates on the described definite yellow circular ring marks image border of step (3-3), three point coordinates on the magenta circular ring marks image border, the central coordinate of circle (
Figure 121334DEST_PATH_IMAGE041
that three point coordinates and three point coordinates on the solid black circle mark image border on the cyan circular ring marks image border are selected yellow circular ring marks;
Figure 21157DEST_PATH_IMAGE042
), the central coordinate of circle (
Figure 587267DEST_PATH_IMAGE043
of magenta circular ring marks;
Figure 436406DEST_PATH_IMAGE044
), the central coordinate of circle (
Figure 62559DEST_PATH_IMAGE045
of cyan circular ring marks;
Figure 449678DEST_PATH_IMAGE046
), the central coordinate of circle (
Figure 616217DEST_PATH_IMAGE047
,
Figure 772392DEST_PATH_IMAGE048
) of solid black circle mark;
(3-4-1), select yellow circular ring marks edge three point coordinates (
Figure 569447DEST_PATH_IMAGE001
;
Figure 178283DEST_PATH_IMAGE002
), (
Figure 663360DEST_PATH_IMAGE003
;
Figure 674041DEST_PATH_IMAGE004
), (
Figure 641997DEST_PATH_IMAGE005
;
Figure 738129DEST_PATH_IMAGE006
) central coordinate of circle (
Figure 246471DEST_PATH_IMAGE041
; ), the method for employing is following:
Whether the central coordinate of circle of judging yellow circular ring marks image meets the following conditions simultaneously:
Figure 516095DEST_PATH_IMAGE049
And
And
Figure 162288DEST_PATH_IMAGE051
If satisfy; Then select the central coordinate of circle of yellow circular ring marks image to be ( ;
Figure 457320DEST_PATH_IMAGE042
); Change step (4-1), otherwise finish option program;
(3-4-2), red circular ring marks edge three point coordinates ( of selection; ), (
Figure 483548DEST_PATH_IMAGE013
; ), (
Figure 256649DEST_PATH_IMAGE015
;
Figure 425331DEST_PATH_IMAGE016
) central coordinate of circle (
Figure 119618DEST_PATH_IMAGE043
;
Figure 771179DEST_PATH_IMAGE044
), the method for employing is following:
Whether the central coordinate of circle of judging magenta circular ring marks image meets the following conditions simultaneously:
And
Figure 274021DEST_PATH_IMAGE053
And
If satisfy; Then the central coordinate of circle of the red circular ring marks image of selection is (
Figure 910856DEST_PATH_IMAGE043
;
Figure 990939DEST_PATH_IMAGE044
); Change step (4-2), otherwise finish option program;
(3-4-3), select cyan circular ring marks edge three point coordinates (
Figure 924260DEST_PATH_IMAGE021
;
Figure 593138DEST_PATH_IMAGE022
), (
Figure 852081DEST_PATH_IMAGE023
;
Figure 403148DEST_PATH_IMAGE024
), ( ;
Figure 929125DEST_PATH_IMAGE026
) central coordinate of circle (
Figure 93390DEST_PATH_IMAGE045
;
Figure 646600DEST_PATH_IMAGE046
), the method for employing is following:
Whether the central coordinate of circle of judging cyan circular ring marks image meets the following conditions simultaneously:
Figure 187303DEST_PATH_IMAGE055
And
And
Figure 165940DEST_PATH_IMAGE057
If satisfy; Then select the central coordinate of circle of cyan circular ring marks image to be (
Figure 691599DEST_PATH_IMAGE045
; ); Change step (4-3), otherwise finish option program;
(3-4-4), select solid black circle mark edge three point coordinates (
Figure 533970DEST_PATH_IMAGE031
;
Figure 853087DEST_PATH_IMAGE032
), (
Figure 69305DEST_PATH_IMAGE033
;
Figure 951810DEST_PATH_IMAGE034
), (
Figure 304294DEST_PATH_IMAGE035
;
Figure 43580DEST_PATH_IMAGE036
) central coordinate of circle (
Figure 481515DEST_PATH_IMAGE047
;
Figure 167711DEST_PATH_IMAGE048
), the method for employing is following:
Whether the central coordinate of circle of judging solid black circle mark image meets the following conditions simultaneously:
Figure 374701DEST_PATH_IMAGE058
And
Figure 799735DEST_PATH_IMAGE059
And
If satisfy; Then select the central coordinate of circle of solid black circle mark image to be (
Figure 949274DEST_PATH_IMAGE047
;
Figure 276350DEST_PATH_IMAGE048
); Change step (4), otherwise finish option program.
4. a kind of machine vision detection method according to claim 3 based on four look printing alignment certification marks; It is characterized in that; The described chromatography deviation that calculates the central coordinate of circle of yellow circular ring marks image, magenta circular ring marks image, cyan circular ring marks image with respect to solid black circle mark central coordinate of circle respectively of above-mentioned steps (4), its concrete steps are following:
(4-1), yellow circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of yellow circular ring marks image with respect to the central coordinate of circle of solid black circle mark image is set, and its calculation expression is respectively:
Figure 623018DEST_PATH_IMAGE061
=
Figure 769965DEST_PATH_IMAGE062
Figure 797964DEST_PATH_IMAGE063
=
Wherein:
Figure 247848DEST_PATH_IMAGE061
,
Figure 147671DEST_PATH_IMAGE063
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of yellow circular ring marks image with respect to the central coordinate of circle of solid black circle mark image; (
Figure 713782DEST_PATH_IMAGE047
;
Figure 812188DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image; (
Figure 438341DEST_PATH_IMAGE041
,
Figure 559881DEST_PATH_IMAGE042
) is the central coordinate of circle of yellow circular ring marks image;
(4-2), magenta circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of magenta circular ring marks image with respect to the central coordinate of circle of solid black circle mark image is set, and its calculation expression is respectively:
Figure 929682DEST_PATH_IMAGE065
= -
Figure 194497DEST_PATH_IMAGE047
Figure 803332DEST_PATH_IMAGE066
=
Figure 711246DEST_PATH_IMAGE067
Wherein:
Figure 784244DEST_PATH_IMAGE065
,
Figure 752200DEST_PATH_IMAGE066
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of magenta circular ring marks image with respect to the central coordinate of circle of solid black circle mark image; ( ;
Figure 559936DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image; (
Figure 503752DEST_PATH_IMAGE043
,
Figure 642609DEST_PATH_IMAGE044
) is the central coordinate of circle of magenta circular ring marks image;
(4-3), cyan circular ring marks chromatography deviation is set
Transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of cyan circular ring marks image with respect to the central coordinate of circle of solid black circle mark image is set, and its calculation expression is respectively:
Figure 960458DEST_PATH_IMAGE068
=
Figure 538070DEST_PATH_IMAGE045
-
Figure 523344DEST_PATH_IMAGE047
Figure 833102DEST_PATH_IMAGE069
=
Figure 638247DEST_PATH_IMAGE070
Wherein:
Figure 3238DEST_PATH_IMAGE068
,
Figure 843018DEST_PATH_IMAGE069
are respectively transverse axis deviation and the longitudinal axis deviation of the central coordinate of circle of cyan circular ring marks image with respect to the central coordinate of circle of solid black circle mark image; (
Figure 323678DEST_PATH_IMAGE047
;
Figure 881699DEST_PATH_IMAGE048
) be the central coordinate of circle of solid black circle mark image; ( ,
Figure 495400DEST_PATH_IMAGE046
) is the central coordinate of circle of cyan circular ring marks image.
5. a kind of machine vision detection method according to claim 4 based on four look printing alignment certification marks; It is characterized in that; Above-mentioned steps (5) is described respectively with transverse axis chromatography deviation square value, longitudinal axis chromatography deviation square value and transverse axis deviation tolerance, longitudinal axis deviation tolerance relatively, obtain respectively exceeding transverse axis deviation tolerance transverse axis chromatography deviation square value, exceed the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance; Its concrete steps are following:
(5-1), with transverse axis chromatography deviation square value and transverse axis deviation tolerance relatively, obtain exceeding the transverse axis chromatography deviation square value of transverse axis deviation tolerance, the employing method is following:
If transverse axis deviation tolerance is ; Its scope does;
Figure 926698DEST_PATH_IMAGE072
; With the square value
Figure 771791DEST_PATH_IMAGE075
of the transverse axis deviation of the square value
Figure 949329DEST_PATH_IMAGE074
of the transverse axis deviation of the square value of the transverse axis deviation of yellow marking image, magenta marking image, cyan marking image respectively with the transverse axis deviation tolerance
Figure 38825DEST_PATH_IMAGE071
of image relatively; If the while is smaller or equal to the transverse axis deviation tolerance
Figure 300042DEST_PATH_IMAGE071
of image; That is, satisfy following condition simultaneously:
Figure 968920DEST_PATH_IMAGE076
; And
Figure 962284DEST_PATH_IMAGE077
; And
Figure 28198DEST_PATH_IMAGE078
then finishes comparison program; If transverse axis deviation tolerance
Figure 30789DEST_PATH_IMAGE071
greater than image; That is, satisfy following condition:
Figure 554174DEST_PATH_IMAGE079
; Or
Figure 718439DEST_PATH_IMAGE080
; Or
Figure 22382DEST_PATH_IMAGE081
; Then obtain exceeding the transverse axis chromatography deviation square value of transverse axis deviation tolerance, change step (6);
(5-2), with longitudinal axis chromatography deviation square value and longitudinal axis deviation tolerance relatively, obtain exceeding the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance, the employing method is following:
If longitudinal axis deviation tolerance is
Figure 563085DEST_PATH_IMAGE082
; Its scope does;
Figure 940976DEST_PATH_IMAGE083
; With the square value
Figure 162507DEST_PATH_IMAGE086
of the longitudinal axis deviation of the square value
Figure 818114DEST_PATH_IMAGE085
of the longitudinal axis deviation of the square value of the longitudinal axis deviation of yellow marking image, magenta marking image, cyan marking image respectively with the longitudinal axis deviation tolerance
Figure 394906DEST_PATH_IMAGE082
of image relatively; If the while is smaller or equal to the longitudinal axis deviation tolerance of image; That is, satisfy following condition simultaneously:
Figure 179508DEST_PATH_IMAGE087
; And
Figure 62013DEST_PATH_IMAGE088
; And then finishes comparison program; If longitudinal axis deviation tolerance
Figure 692067DEST_PATH_IMAGE082
greater than image; That is, satisfy following condition: ; Or
Figure 816198DEST_PATH_IMAGE091
; Or
Figure 23189DEST_PATH_IMAGE092
; Then obtain exceeding the longitudinal axis chromatography deviation square value of longitudinal axis deviation tolerance, change step (6).
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CN110893725A (en) * 2018-09-12 2020-03-20 海德堡印刷机械股份公司 Register-register measurement with circular measurement marks
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CN111016449A (en) * 2019-05-23 2020-04-17 深圳圣德京粤科技有限公司 Method for adjusting positive and negative overprinting of ink-jet printing
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