CN108391030A - A kind of the colorless fluorescent halftone color image screening method and device arranged side by side based on site - Google Patents
A kind of the colorless fluorescent halftone color image screening method and device arranged side by side based on site Download PDFInfo
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- CN108391030A CN108391030A CN201810149193.5A CN201810149193A CN108391030A CN 108391030 A CN108391030 A CN 108391030A CN 201810149193 A CN201810149193 A CN 201810149193A CN 108391030 A CN108391030 A CN 108391030A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/54—Conversion of colour picture signals to a plurality of signals some of which represent particular mixed colours, e.g. for textile printing
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Abstract
The invention discloses a kind of colorless fluorescent halftone color image screening method and device arranged side by side based on site.Method includes：The threshold matrix for site am screening arranged side by side is constituted with equilateral triangle site, and am screening is carried out to tri- color separation film of R, G, B of coloured image using the threshold matrix, color separation film is made to form half tone image.Device includes：Matrix module, the threshold matrix of the site am screening arranged side by side for being constituted with equilateral triangle site.Equilateral triangle site am screening method arranged side by side proposed by the present invention, so that the contrast effect that colorless fluorescent halftone color image is presented is good, the tint hierarchy of image can be showed well, reproducibility is good, overcomes the prior art and realizes the problems of colorless fluorescent coloured image.
Description
Technical field
The present invention relates to colorless fluorescent print fields, more particularly, to a kind of colorless fluorescent arranged side by side based on site half
Tone color images screening method and device.
Background technology
In recent years, with the continuous maturation of printing anti-counterfeiting technology, more and more suppliers that print pursue unique, safety
Anti-counterfeiting art effect.Colorless fluorescent ink implements that simple, bright-colored, good concealment, cost be relatively low, reviewing party due to having
Just the features such as, increasingly has been favored by people.Colorless fluorescent printing ultraviolet light shortwave excitation under can launch wavelength it is longer
Visible light, thus there is certain antifalse effect, it is widely used in the fields such as packages printing and anti-counterfeit printing.Currently, colourless
Fluorescence is confined to print monochromatic pattern, and the technology using the very color anti-counterfeiting image of colorless fluorescent printing is also immature, and rank is presented in site
The effect of tune is poor, apply in practice it is less, thus to using the research of colorless fluorescent ink printing color patterning technique aobvious
It obtains particularly important.
The duplication for attempting to carry out true color image using colorless fluorescent ink is had begun in the prior art so that in fluorescence
It is observed that coloured image bright in luster, that contrast is abundant under lamp.It is disclosed in Chinese patent CN102241208A a kind of colourless
Fluorescence falsification preventing method, this method are intended to carry out repeatedly colouring to same piece image to reach by three kinds of fluorescent colors of red, blue, yellow
The image effect of colored double exposure, and antifalse effect is improved to reach by the anti-fake line of the frequency modulation of hyperline, personalized artificial signature
Purpose.By the patent context, the mode of this colour double exposure cannot restore the abundant coloured image of contrast well.
It is also disclosed that in Chinese patent CN102514408A a kind of using colorless fluorescent ink printing color anti-counterfeiting image
Method, this method carry out color separation processing according to three color of red, green, blue to printing anti-counterfeiting image using image processing software, then press
Photograph and picture carries out network point distribution processing, is fabricated to three color printing plate of red, green, blue, it is colourless glimmering to reuse three color of corresponding red, green, blue
Light ink is printed on the machine.By the patent context, specific network point distribution processing method or algorithm are not proposed, it is difficult
To judge the specific effect of the colorless fluorescent ink printing color anti-counterfeiting image of its realization.
A kind of production method of colourless fluorescent ink anti-counterfeiting printing product is also disclosed in Chinese patent CN102490507A, it should
Patent the method and the method described in Chinese patent CN102514408A are almost the same, have no substantive improvement plan.
A kind of fluorescence coloured picture screening method and device are disclosed in Chinese patent CN106515241A, this method proposes near
Few three sites are arranged in an equilateral triangle or regular hexagonal cell unit, and grid cell is arranged networking battle array, have public affairs
The grid element center point line on side and the angle of horizontal datum include X °, X+60 ° or X+120 ° altogether, wherein X between 0 ° -360 °,
Then screening processing is carried out in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB types ink.Change the row of site by this method
Row mode, to reduce the probability of tri- color ink double exposures of RGB, solution colorless fluorescent ink generates pale under ultraviolet excitation state
The problem of, but double exposure probability of this method due to reducing RGB three-colour printing inks, the image restored can be made whole partially dark,
The bad phenomenon of bright part color rendition occurs.
It is visible under printing fluorescent lamp on anti-fake certificate and marketable securities that one kind is disclosed in foreign patent US8085438B2
Coloured image method, this method using linear array site carry out tri- color of R, G, B screening arranged side by side handle, i.e. R, G,
The site of tri- colors of B successively between wrong arrangement, linear, then printed using tri- color colorless fluorescent ink of corresponding R, G, B.
It is avoided that the phenomenon that tri- colors of RGB cause color to whiten by overlapping excessively by this method, but since site is that whole line shape is arranged side by side
, the gap between neighbour node can make paper color reveal out, and when being observed under ultraviolet light, the sheet of unstressed configuration brightening agent addition
Coloured paper is in black or grey black, this makes the coloured image realized by this method, and tone is partially dark on the whole.
Invention content
The present invention is at least one defect overcome described in the above-mentioned prior art, is proposed a kind of based on arranged side by side colourless in site
Fluorescence halftone color image screening method and device, can show the tint hierarchy of image well, and reproducibility is good.
In order to solve the above technical problems, technical scheme is as follows：
A kind of colorless fluorescent halftone color image screening method arranged side by side based on site is provided, is included the following steps：
S1. the threshold matrix for site am screening arranged side by side is constituted with equilateral triangle site；
S2. different threshold matrixes is set for tri- color separation of R, G, B, the satisfaction when carrying out threshold process to image：Image
Bright part dot cover area increases with the increase of high light, and net is formed in bright part to meet the tri- color site R, G, B
The effect of point overlapping so that the bright part of reduction is consistent with original image；Image shadow part dot cover area is with dark
The increase of tune and reduce, form site effect arranged side by side to meet the tri- color site R, G, B in shadow part so that reduction it is dark
Part is adjusted to be consistent with original image；
S3. it uses threshold matrix corresponding with tri- color separation of R, G, B to carry out amplitude modulation to tri- color separation film of R, G, B of coloured image to add
Net makes color separation film form half tone image；
Color separation printing plate is exported after the completion of screening color separations, and is printed using corresponding R, G, B color colorless fluorescent ink, it is multiple
Make color, contrast the colorless fluorescent halftone color image consistent with artwork.
Further, step S1 is specifically included：
Step S11, equilateral triangle site of tiling in threshold matrix；
Different threshold matrixes is arranged for tri- color separation of R, G, B in step S12；
Step S13, by each equilateral triangle of each pixel-map of corresponding threshold matrix to tri- color separation of corresponding R, G, B
Site；
Threshold value is arranged to each pixel therein for each equilateral triangle site in tri- color separation of R, G, B in step S14.
Further, step S11 is specifically included：
The threshold matrix is divided into multiple characteristic rectangles of tiling；
Each characteristic rectangle, which is arranged, includes：Two equilateral triangle site D01 and D02, it is in an intermediate position and 4 1/2 just
Triangle site D1, D2, D3, D4 are located at the quadrangle of characteristic rectangle, and adjacent with D01 and D02.Wherein, with direction of tiling
Horizontal line be cutting line, pass through equilateral triangle center line, equilateral triangle site is divided into 2 parts.
Further, in step S11, the method that the threshold matrix is divided into multiple characteristic rectangles of tiling includes：
The long s and width t that characteristic rectangle is arranged are relatively prime, and meet
Setting tiling direction θ, wherein tg θ=a/b, and a and b is also relatively prime；
The long M and width N of threshold matrix are set, wherein：
Wherein, Min {, } indicates to be minimized operation,<,>Expression takes greatest common divisor operation, symbol int () expressions to take just
Number operation, res are the output for printing resolution ratio, and freq is printing screening line number.
Further, step S12 is specifically included：
The threshold value of R color separation films is arranged using the left vertex of equilateral triangle as starting point, is moved towards shown in arrow along figure, until positive triangle
Vertex is terminated in shape, completes threshold value setting；
The threshold value of G color separation films is arranged using the right vertex of equilateral triangle as starting point, is moved towards shown in arrow along figure, until positive triangle
The left vertex of shape is terminated, and threshold value setting is completed；
The threshold value of B color separation films is arranged using the upper vertex of equilateral triangle as starting point, is moved towards shown in arrow along figure, until positive triangle
The right vertex of shape is terminated, and threshold value setting is completed.
Further, minimum threshold matrix [M is obtainedmin, Nmin], M at this timemin=34, Nmin=20.
Another object of the present invention is to provide a kind of am screening devices that site is arranged side by side, including：Matrix module is used for
With the threshold matrix for the site am screening arranged side by side that equilateral triangle site is constituted.
Further, the matrix module includes：
Tile module, for the equilateral triangle site of tiling in the threshold matrix.The tiling module includes：
Division module, multiple characteristic rectangles for the threshold matrix to be divided into tiling；
Module is built, includes for each characteristic rectangle to be arranged：Two equilateral triangle site D01 and D02 are in interposition
It sets and 4 1/2 equilateral triangle sites D1, D2, D3, D4, is located at the quadrangle of characteristic rectangle, and adjacent with D01 and D02.Its
In, using the horizontal line in direction of tiling as cutting line, the center line of equilateral triangle is passed through, equilateral triangle site is divided into 2 parts.
Compared to the prior art, beneficial effects of the present invention are：
Screening method arranged side by side proposed by the present invention so that colorless fluorescent halftone color image present contrast effect compared with
It is good, the tint hierarchy of image can be showed well, reproducibility is preferable.
Description of the drawings
Attached drawing as used herein constitutes part of this application, this hair to provide a further understanding of the present invention
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In attached drawing：
Fig. 1 is the schematic diagram according to the equilateral triangle dot shape changing rule of the embodiment of the present invention.
Fig. 2 is the flow chart that threshold matrix is constituted with equilateral triangle site according to the embodiment of the present invention.
Fig. 3 is the characteristic rectangle schematic diagram created according to the embodiment of the present invention.
Fig. 4 is multiple characteristic rectangle schematic diagrames that threshold matrix is divided into tiling according to the embodiment of the present invention.
Fig. 5 is to divide schematic diagram according to equilateral triangle in each characteristic rectangle of the embodiment of the present invention.
Fig. 6 is that signal is moved towards in threshold value setting when being arranged according to tri- chromatic threshold value of R, G, B of the embodiment of the present invention in equilateral triangle
Figure.
Fig. 7 is to simulate printing schematic diagram according to the tri- color half tone image of R, G, B of the embodiment of the present invention.
Fig. 8 is the minimum threshold matrix of the R color separation films obtained according to threshold matrix processing mode described in the embodiment of the present invention
Schematic diagram.
Specific implementation mode
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
A kind of colorless fluorescent half tone image screening method that site is arranged side by side is present embodiments provided, including：With positive triangle
Shape site constitutes the threshold matrix for site am screening arranged side by side.
Specifically include following steps：
S1. the threshold matrix for site am screening arranged side by side is constituted with equilateral triangle site；
S2. different threshold matrixes is set for tri- color separation of R, G, B, the satisfaction when carrying out threshold process to image：Image
Bright part dot cover area increases with the increase of high light, and net is formed in bright part to meet the tri- color site R, G, B
The effect of point overlapping so that the bright part of reduction is consistent with original image；Image shadow part dot cover area is with dark
The increase of tune and reduce, form site effect arranged side by side to meet the tri- color site R, G, B in shadow part so that reduction it is dark
Part is adjusted to be consistent with original image；
S3. it uses threshold matrix corresponding with tri- color separation of R, G, B to carry out amplitude modulation to tri- color separation film of R, G, B of coloured image to add
Net makes color separation film form half tone image.
Fig. 1 be the present embodiment equilateral triangle dot shape with 0-100 contrast change procedure site changing rule
Schematic diagram.According to the otherness of coloured light additive color principle and colorant subtractive theorem, the most deep left side of color after halftone screen in Fig. 1
Side is the most shallow white area of color (highlight area) in fact in original image；The most shallow right side of color after halftone screen,
It is the most deep black region of color (shadow region) in fact in original image.
Fig. 2 shows the flows that threshold matrix is constituted with equilateral triangle site in accordance with a preferred embodiment of the present invention
Figure, including：
Step S11, equilateral triangle site of tiling in threshold matrix；
Different threshold matrixes is arranged for tri- color separation of R, G, B in step S12；
Step S13, by each equilateral triangle of each pixel-map of corresponding threshold matrix to tri- color separation of corresponding R, G, B
Site；
Threshold value is arranged to each pixel therein for each equilateral triangle site in tri- color separation of R, G, B in step S14.
Fig. 3-Fig. 5 shows the equilateral triangle (step S11) according to the preferred embodiment of the invention that tiles in threshold matrix
Schematic diagram, Fig. 3 show the characteristic rectangle of establishment；Fig. 4 show multiple characteristic rectangles that threshold matrix is divided into tiling；
Fig. 5 show each characteristic rectangle of setting：Two equilateral triangle site D01 and D02, it is in an intermediate position and 4 1/2
Equilateral triangle site D1, D2, D3, D4 are located at the quadrangle of characteristic rectangle, and adjacent with D01 and D02.Wherein, with the side of tiling
To horizontal line be cutting line, pass through equilateral triangle center line, equilateral triangle site is divided into 2 parts.
Fig. 6 show described in step S12 when for tri- color separation of R, G, B, different threshold matrixes are set, in equilateral triangle
Schematic diagram is moved towards in interior threshold value setting.Wherein, the threshold value of R color separation films is arranged using the left vertex of equilateral triangle as starting point, along figure
Trend shown in arrow completes threshold value setting until vertex is terminated on equilateral triangle；The threshold value of G color separation films is arranged with equilateral triangle
Right vertex is starting point, is moved towards shown in arrow along figure, until the left vertex of equilateral triangle is terminated, completes threshold value setting；The threshold of B color separation films
Value is arranged using the upper vertex of equilateral triangle as starting point, is moved towards shown in arrow along figure, until the right vertex of equilateral triangle is terminated, completes threshold
Value setting；
It since equilateral triangle compares square or rectangular site, can not tile, therefore define in threshold matrix
Characteristic rectangle A (i.e. shown in Fig. 3), after carrying out threshold matrix tiling operation (i.e. shown in Fig. 4) using characteristic rectangle A, in each spy
It levies and divides equilateral triangle (i.e. shown in Fig. 5) in rectangle A, the effect for equilateral triangle site of tiling in threshold matrix is realized with this.
Fig. 7 show tri- color half tone image of R, G, B simulation printing schematic diagram according to the preferred embodiment of the invention, wherein
Black be simulation ultraviolet light under unbleached paper color developing effect.Enlarged drawing show original image shadow part R, B on the left of Fig. 7
The laid out in parallel effect of double-colored site；Intermediate enlarged drawing show the arranged side by side of the tri- color site original image middle tone part R, G, B
Arrangement effect, wherein R, B are double-colored has there is site excessive effects；Right side enlarged drawing show original image bright part R, G,
The overlapping arrangement effect of the tri- color sites B makes three color coloured light be added by presentation white, and leads to by the double exposure of the tri- color site R, G, B
The dimmed phenomenon of high light tone that the mode for crossing three color double exposures avoids image bright part from occurring side by side entirely due to site.
Preferably, include by the method that threshold matrix is divided into multiple tiling characteristic rectangles：
The long s and width t that characteristic rectangle is arranged are relatively prime, and meet
Setting tiling direction θ, wherein tg θ=a/b, and a and b is also relatively prime；
The long M and width N of threshold matrix are set, wherein：
Wherein, Min {, } indicates to be minimized operation,<,>Expression takes greatest common divisor operation, symbol int () expressions to take just
Number operation, res are the output for printing resolution ratio, and freq is printing screening line number；
Preferably, as θ=0, s=17, t=10 are set, obtain minimum threshold matrix [M at this timemin, Nmin], M at this timemin
=34, Nmin=20, so as to mitigate calculation amount, accelerates screening processing speed, be easily achieved with computer.
Fig. 8 show the minimum of the R color separation films obtained according to threshold matrix processing mode described in the preferred embodiment of the present invention
Threshold matrix similarly can obtain the minimum threshold matrix of G, B color separation film, and the threshold matrix for meeting tri- color separation film of R, G, B is complete
It is complete different.
Embodiment 2
The present embodiment provides a kind of colorless fluorescent halftone color image screening device arranged side by side based on site, including：Square
Array module, for being constituted the threshold matrix for am screening with equilateral triangle site.It also include tiling mould in the matrix module
Block, for equilateral triangle site of tiling in threshold matrix.
Preferably, tiling module includes：
Division module, multiple characteristic rectangles for the threshold matrix to be divided into tiling；
Module is built, includes for each characteristic rectangle to be arranged：Two equilateral triangle site D01 and D02 are in interposition
It sets and 4 1/2 equilateral triangle sites D1, D2, D3, D4, is located at the quadrangle of characteristic rectangle, and adjacent with D01 and D02.Its
In, using the horizontal line in direction of tiling as cutting line, the center line of equilateral triangle is passed through, equilateral triangle site is divided into 2 parts.
The above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be to the present invention
Embodiment restriction.For those of ordinary skill in the art, it can also make on the basis of the above description
Other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all the present invention
All any modification, equivalent and improvement etc., should be included in the protection of the claims in the present invention made by within spirit and principle
Within the scope of.
Claims (10)
1. a kind of colorless fluorescent halftone color image screening method arranged side by side based on site, which is characterized in that use positive triangle
Shape site constitutes the threshold matrix for site am screening arranged side by side.
2. the colorless fluorescent halftone color image screening method arranged side by side based on site according to claim 1, feature
It is, includes the following steps：
S1. the threshold matrix for site am screening arranged side by side is constituted with equilateral triangle site；
S2. different threshold matrixes is set for tri- color separation of R, G, B, the satisfaction when carrying out threshold process to image：Image high light
Part dot cover area increases with the increase of high light, and site weight is formed in bright part to meet the tri- color site R, G, B
Folded effect so that the bright part of reduction is consistent with original image；Image shadow part dot cover area is with shadow
Increase and reduce, forms site effect arranged side by side in shadow part to meet the tri- color site R, G, B so that the shadow portion of reduction
Divide and is consistent with original image；
S3. threshold matrix corresponding with tri- color separation of R, G, B is used to carry out am screening to tri- color separation film of R, G, B of coloured image,
Color separation film is set to form half tone image.
3. the colorless fluorescent halftone color image screening method arranged side by side based on site according to claim 2, step S1
It specifically includes：
Step S11, equilateral triangle site of tiling in threshold matrix；
Different threshold matrixes is arranged for tri- color separation of R, G, B in step S12；
Step S13, by each equilateral triangle net of each pixel-map of corresponding threshold matrix to tri- color separation of corresponding R, G, B
Point；
Threshold value is arranged to each pixel therein for each equilateral triangle site in tri- color separation of R, G, B in step S14.
4. the colorless fluorescent halftone color image screening method arranged side by side based on site according to claim 3, step S11
It specifically includes：
The threshold matrix is divided into multiple characteristic rectangles of tiling；
Each characteristic rectangle, which is arranged, includes：Two equilateral triangle site D01 and D02, in an intermediate position and 4 1/2 positive triangles
Shape site D1, D2, D3, D4 are located at the quadrangle of characteristic rectangle, and adjacent with D01 and D02.Wherein, with the water in direction of tiling
Horizontal line is cutting line, passes through the center line of equilateral triangle, equilateral triangle site is divided into 2 parts.
5. the colorless fluorescent halftone color image screening method arranged side by side based on site according to claim 4, step S11
In, the method that the threshold matrix is divided into multiple characteristic rectangles of tiling includes：The long s and width t that characteristic rectangle is arranged are mutual
Matter, and meet
Setting tiling direction θ, wherein tg θ=a/b, and a and b is also relatively prime；
The long M and width N of threshold matrix are set, wherein：
Wherein, Min {, } indicates to be minimized operation,<,>Expression takes greatest common divisor operation, symbol int () expressions that positive number is taken to transport
It calculates, res is the output for printing resolution ratio, and freq is printing screening line number.
6. the colorless fluorescent halftone color image screening method arranged side by side based on site according to claim 3 or 4 or 5,
Step S12 is specifically included：
The threshold value of R color separation films is arranged using the left vertex of equilateral triangle as starting point, is moved towards shown in arrow along figure, until on equilateral triangle
Vertex is terminated, and threshold value setting is completed；
The threshold value of G color separation films is arranged using the right vertex of equilateral triangle as starting point, is moved towards shown in arrow along figure, until equilateral triangle is left
Vertex is terminated, and threshold value setting is completed；
The threshold value of B color separation films is arranged using the upper vertex of equilateral triangle as starting point, is moved towards shown in arrow along figure, until equilateral triangle is right
Vertex is terminated, and threshold value setting is completed.
7. the colorless fluorescent halftone color image screening method arranged side by side based on site according to claim 3 or 4 or 5,
It is characterized in that, obtaining minimum threshold matrix [Mmin, Nmin], M at this timemin=34, Nmin=20.
8. a kind of colorless fluorescent halftone color image screening device arranged side by side based on site, which is characterized in that including：
Matrix module, for being constituted the threshold matrix for am screening arranged side by side with equilateral triangle site.
9. the colorless fluorescent halftone color image screening device arranged side by side based on site according to claim 8, feature
It is, the matrix module includes：
Tile module, for the equilateral triangle site of tiling in the threshold matrix.
10. the colorless fluorescent halftone color image screening device arranged side by side based on site according to claim 9, feature
It is, the tiling module includes：
Division module, multiple characteristic rectangles for the threshold matrix to be divided into tiling；
Module is built, includes for each characteristic rectangle to be arranged：Two equilateral triangle site D01 and D02, it is in an intermediate position,
With 4 1/2 equilateral triangle sites D1, D2, D3, D4, it is located at the quadrangle of characteristic rectangle, and adjacent with D01 and D02.Wherein,
Using the horizontal line in direction of tiling as cutting line, the center line of equilateral triangle is passed through, equilateral triangle site is divided into 2 parts.
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|---|---|---|---|
| CN201810149193.5A CN108391030B (en) | 2018-02-12 | 2018-02-12 | Colorless fluorescent halftone color image screening method and device based on dot juxtaposition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810149193.5A CN108391030B (en) | 2018-02-12 | 2018-02-12 | Colorless fluorescent halftone color image screening method and device based on dot juxtaposition |
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| CN108391030B CN108391030B (en) | 2020-11-03 |
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| CN108391030B (en) | 2020-11-03 |
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