CN106274098B - A method of identifying hidden text figure using moire phenomenon - Google Patents
A method of identifying hidden text figure using moire phenomenon Download PDFInfo
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- CN106274098B CN106274098B CN201610649332.1A CN201610649332A CN106274098B CN 106274098 B CN106274098 B CN 106274098B CN 201610649332 A CN201610649332 A CN 201610649332A CN 106274098 B CN106274098 B CN 106274098B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/06—Lithographic printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
- B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/005—Colour cards; Painting supports; Latent or hidden images, e.g. for games; Time delayed images
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The present invention discloses a kind of method identifying hidden text figure using moire phenomenon.Answer design for existing textbook books problem is unreasonable, to reduce answer thinking interference is generated to reading, this method is to use same way screening to character and graphic and background, and it is in staggered distribution, hiding for character and graphic is realized under high-resolution screen frequency, suitable material and mode of printing is selected to make identification card, identification card meshing method is identical as hidden area, therefore identification card generates moire interference with hidden area overlapping, character and graphic is set to generate opposite interference with background, the difference for increasing the two, realizes the identification of text graphic information.This method is easily understood, and typographical printing is convenient, and verification operation is simple, and the enjoyment of reading can be enjoyed during Validation Answer Key.
Description
Technical field
The present invention relates to a kind of method identifying hidden text figure using optical interference phenomena, more particularly to a kind of utilizations
The method that moire phenomenon identifies hidden text figure.
Background technology
In books and publications, especially it is suitble in the books of children's books reading matter, often with interesting property, inspiration
Property, educational problem and reader generate interactive, culture reader thinks deeply exploring ability, while harvesting the enjoyment of reading.However this
The answer of a little problems is directly printed on after problem a bit, some are imprinted on after problem, some are imprinted on the somewhere in book.These
Method all cannot effectively hide answer, be easy to be found by reader, to influence reader's thinking, while be not achieved problem designer's
Original meaning.
Invention content
The purpose of the present invention is the deficiencies for existing method, provide a kind of utilization moire phenomenon identification hidden text figure
Method.This method is staggered screening by high screen frequency and picture and text and background so that character and graphic is effectively hidden, and can use
With picture and text, background moire interference occurs for identification card respectively, increases picture and text discrimination, convenient identification information.Whole process is confirmatory
Can be strong, display effect is good.
The technical solution of the method for the present invention be divided into hiding content and background screening constitute hidden area and using identification card with
The moire phenomenon that hidden area generates is as follows to identify two processes progress of text graphic information, particular content：
Step 1 hides content and the screening of background constitutes hidden area：
1.1 due to hiding content include word or/and figure, thus according to actual conditions design the font of word, font size with
The shape of figure.
It is 175~200lpi that 1.2 hiding contents, which use δ (40 °~50 °) angle screening, screen frequency l, and cable is black,
So that every cable thickness w is equal to adjacent cable spacing d and about 0.0635~0.0726mm, striped hollow out word figure is formed
Shape.
1.3 background parts using the identical meshing method in 1.2 hiding content parts, and with the hiding content portion described in 1.2
Misclassification opens screening, that is, the clear area hidden between the extended line cable just adjacent in background of content screening line overlaps.
1.4 is ensure that it is clear-cut that hiding content is shown, 1.2 and 1.3 cable overlap joint detailed design has certain rule.
1.5 hiding content parts and background parts printing composition a certain size, the hidden area of shape.It is hidden due to hidden area
It is high with background screen frequency to hide content, adjacent cable is smaller than resolving power of the eye 0.2mm (under certain light source and visual field), therefore
Hidden area is not easy to be identified by the human eye, and has achieved the effect that hidden text figure.
Step 2 identifies text graphic information using the moire phenomenon that identification card and hidden area generate：
2.1 design identification card size shapes, select suitable material and mode of printing to make identification card；
(1) preferably, the material of identification card is PET polyester plastics sheet materials, light transmission is strong, and it is dry to be conducive to generation striped
It relates to.
(2) preferably, printing ink is UV ink, UV ink is that one kind not having to solvent, and rate of drying is fast, good luster,
It is bright in luster, the good ink of water-fast, solvent resistant, wearability.UV ink has become a kind of more ripe ink technology, pollutant
It discharges almost nil.UV ink is good in the inking of phenolic aldehyde polyester plastics sheet material, is not easy to take off ink, and Environmental Safety, does not influence to make
User's health.
(3) preferably, mode of printing is lithographic printing, due to areas and the non-graphic portion on lithographic printing plate
Divide and is nearly in approximately the same plane, in printing, in order to make ink distinguish printing elements or non-graphic part,
Supply water first from the water supply installation of printing plate component to the non-graphic part of printing plate, to protect the non-graphic part of printing plate not by
Ink soaks.
The part of hidden area for identification of identification card is used meshing method identical with 1.2 by 2.2, and can be with hiding content
It is respectively formed interference fringe with background, remainder stamps the picture and text explanation in relation to identification card.
Identification card is placed with the cable on hidden area, identification card by 2.3 is superimposed generation moire phenomenon with the cable of hidden area,
Cable angle is γ (0 °~90 °), and γ ' is the identification critical angle in γ, as a result as follows：
(1) work as γ>When γ ', hiding content deforms, and the moire period is small, and character and graphic is not easy to identify.
(2) as γ≤γ ', because hiding content is identical as background meshing method but printing ink and blank distribution are on the contrary, institute
With mobile or rotation identification card, content light and shade variation is hidden.Concrete condition is：
1. when the cable of both γ=0 ° and identification card and background is completely superposed, background is still in hollow out striped；Identification card
Connect with hiding content cable or so, it is in entity mass colour to hide content.Due to screen frequency height, visually observe less than cable, because
This feels that hiding content is deeper than background color, similar positive image text.Otherwise similar negative image text (when i.e. completely misaligned).
2. when γ=0 ° and identification card it is higher with the cable overlapping degree of both backgrounds (i.e. between half overlap with completely weight
Close) when, display background cable is thicker, and spacing becomes smaller, and is in still hollow out striped, connects with hiding content cable side, blank spacing
It is smaller, generate similar positive image text.Otherwise similar negative image text (when being overlapped between half and is completely misaligned).
3. when γ=0 ° and identification card (i.e. half overlaps) identical as the two overlapping degree, that is, hide content and background hollow out
Degree is identical, similar to hidden area, and character and graphic is hidden at this time.
4. when 0 °<When γ≤γ ', hides content part and occur to reinforce interference, background parts occur to weaken interference, form sun
Picture and text, on the contrary form negative image text.With the variation of angle, the two alternately, thus increases the area for hiding content and background
Not.When wherein identification card is identical as the two interference, graph-text content is hidden.
The moire phenomenon meets the principle of interference of light：Two row or several row light waves are overlapped mutually when space is met,
Some regions are reinforced always, the phenomenon that other regions then weaken, form stable strength distribution always.
The present invention embodies contacting for moire phenomenon and interference phenomenon, with concrete principle be：
From the perspective of from essence, after the moire in printing is overlapped by the linear grating that the site of discontinuity forms with certain angle,
The several picture generated due to the interference of light.If the angle of 2 raster of dots is γ, the spacing of site is respectively P1And P2, and
The space periodic of 2 gratings differs smaller, P1>P2；Moire spacing is P, and moire direction is ɑ.
Tollenaar formula are obtained according to trigonometric function relationship：
If the screen frequency of 2 color version sites is respectively n1And n2, the frequency of moire is N, then has:
And the equidirectional, same frequency of Tomas Young's tow-slit experiment, there are two monochromatic sources of constant first phase difference to be sent out
The superposition of two row light waves.S is linear light source, and G is an eclipser, there is two slit Ss parallel with S thereon1、S2, and it is equidistant with S
From, therefore S1、S2It is coherent source, and phase is identical；S1、S2The distance between be d, the distance to screen is D.
Investigate the wave path-difference at upper certain point Q of screen.In general, double slit is much larger than double slit to the vertical range between screen
Between distance, i.e. D>>d,S1、S2Wave-path to Q points is respectively r1、r2, λ is wavelength, and θ is Q points to S1、S2Between company apart from midpoint
Line and horizontal angle, then the wave path-difference of Q points is r=r2-r1≈ dsin θ=± k λ, k=0,1,2 ...
It is deformed again by Tollennar formula：H=Psin γ (h P1、P2, γ composition triangle third side on height)
This formula is corresponding with the formula of interference of light wave path-difference, and further the contact of science and technology is showed.Furtherly, tortoise
Line is a kind of embodiment of optical phenomena, and especially under coherent source, with a kind of optimal angle, we can be clearly observed.
Frequency, intensity and the viewing angle of light source all have an impact the generation of moire.
When moire formation basic theory analysis cable angle γ being used to be more than identification critical angle γ ' below, picture and text cannot be identified
The reason of：
If hidden area cable center spacing is equal to identification card cable center spacing and is all P0, cable angle is γ.According to
Formula (1) is calculated, moire period P=P0/ [2sin (γ/2)], moire direction α=90 ° ± arccos [Psin γ/P0]。
From expression formula it is also seen that being inversely proportional with angle in the moire period.Substitute into P0(figure/text is distinguished for numerical value and P identifications critical numerical value
Degree), 90 ° of γ ≈ γ ', α ≈ can be obtained.When being less than figure/text discrimination in the moire period, γ>γ ', graphic profile are difficult identification, side
It differs greatly to α close to 90 ° and picture and text screen angle δ, picture and text is made to generate visual deformation, picture and text are formed close with background at this time
The vision of hidden area is distributed.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) for reader, when thinking, is not interfered by character and graphic, easy to verify, is full of children's interesting, while can feel
The enjoyment read；
(2) for publishing house, typesetting is convenient, after only hidden area need to being imprinted on problem；
(3) for problem designer, diversity is presented in answer, increases the interactivity with reader, has attracted reader,
It increases readability；
(4) for researcher, the example of principle of knowledge application is provided, inspires them to carry out related horizontal and vertical
Research etc..
Description of the drawings
Fig. 1 is identification card identification division screening schematic diagram
Fig. 2 is the screening enlarged drawing that books print hidden area segment word and ambient background.
Fig. 3 is the cloudy word figure that identification card is generated with hidden area segment word and ambient background overlapping.
Fig. 4 is that books print hidden area school and mark on a map the screening enlarged drawing of shape and ambient background.
Fig. 5 is the cloudy shape figure that identification card is generated with hidden area figure and ambient background overlapping.
Fig. 6 is the screening enlarged drawing that books print that character and graphic and ambient background are marked in hidden area school.
Fig. 7 is the cloudy shape figure that identification card is generated with hidden area character and graphic and ambient background overlapping.
Specific implementation mode
Explanation that the present invention is further analyzed in the following with reference to the drawings and specific embodiments.
Embodiment 1
The screening line concealing of step 1 text informations：
1.1 according to the content of the puzzle answer " thing that a fat person finds：Corner Li Nagenyin the spool of fox face." set
Count word font size, the word should structure it is smooth, it is smooth vertical and horizontal, convenient for screening line printing hide and observation, so
Black matrix is advisable, " the thing that a fat person finds：" it is puzzle title, font size should be No. four." corner Li Nagenyin the volume of fox face
Axis." it is answer content, font size should be No. five.Two parts respectively account for a line, since typesetting is on the left of books, so left-justify two
Point, it is overlapped convenient for identification card.
1.2 word segments select 45 ° of screenings, and screen frequency 200lpi, cable is black so that cable thickness is equal to phase
Adjacent cable is spaced about 0.0635mm, forms striped hollow out word.
1.3 background parts use the identical meshing method of 1.2 word segments, and are staggered and add with the word segment described in 1.2
Clear area between net, the i.e. extended line of word screening line cable just adjacent in background overlaps.
1.4 is ensure that text profile is clear, and 1.2 and 1.3 cable overlap joint meets following rule：
(1) when strokes of characters is " cross ", cable connects with the background cable that top keeps left in " cross ", with the back of the body kept right below
Scape cable connects.
(2) when strokes of characters is " perpendicular ", cable connects with the background cable of the left side on the lower in " perpendicular ", the top back of the body with the right
Scape cable connects.
(3) strokes of characters does not connect in the cable of turning point and inclined stroke with background cable, or all with both sides cable
Connect.
(4) when strokes of characters is " slash ", " right-falling stroke ", cable connects to be gradient to (1) by (2).
(5) when strokes of characters angle is close to 45 °, stroke cable contour connection is prone to dot gain and papering, so
There are blank, increase cable spacing.
1.5 words and background printing composition a certain size, the hidden area of shape, hidden area is round rectangle, a length of
100.0mm, width 20.0mm, wide fillet radius of the radian are 4.0mm, and hidden area frame is solid line, wide about 0.25mm.Hidden area
Word and background discrimination are small, and screen frequency is high, is not easy to be identified by the human eye, has achieved the effect that hiding answer, as shown in Figure 2.
Step 2 identifies text information using the moire phenomenon that identification card and hidden area generate：
2.1 according to the size shape and service condition of hidden area：
(1) identification card, the rounded rectangle of identification card, a length of 100.0mm, width 40.0mm, wide fillet radius of the radian are designed
For 4.0mm, hidden area frame is solid line, wide about 0.25mm.It can not only facilitate and read hidden area, be also used as bookmark, such as
Shown in Fig. 1.
(2) material selection of identification card is PET polyester plastics sheet materials, and light transmission is strong, is conducive to that speckle pattern interferometry occurs.
(3) printing ink is UV ink, and UV ink is that one kind not having to solvent, and rate of drying is fast, good luster, bright in luster,
The good ink of water-fast, solvent resistant, wearability.UV ink has become a kind of more ripe ink technology, and pollutant emission is almost
It is zero.UV ink is good in the inking of PET polyester plastics sheet materials, is not easy to take off ink, and Environmental Safety, does not influence user's health.
(4) mode of printing is lithographic printing, since the areas on lithographic printing plate is almost located with non-graphic part
In in approximately the same plane, in printing, in order to make ink distinguish printing elements or non-graphic part, first by printing
The water supply installation of version component supplies water to the non-graphic part of printing plate, to protect the non-graphic part of printing plate not soaked by ink
It is wet.
The part of hidden area for identification of identification card is used meshing method identical with 1.2 by 2.2, and can be with word and the back of the body
Scape is respectively formed interference fringe, and remainder stamps the picture and text explanation in relation to identification card.
The identification division of identification card is placed with by certain angle in hidden area, profit by 2.3 hand-held identification card picture and text declaratives
It is as a result as follows with moire phenomenon reading characters information：
(1) work as γ>At 10 °, the moire period is less than human eye maximum resolution so that word deforms, and word is not at this time
It is easy to identify.
(2) when γ≤10 °, because word is identical as background meshing method but printing ink and blank distribution are on the contrary, move
Dynamic or rotation identification card, the variation of word light and shade.Select γ=0 ° best, moire is infinitely great at this time, is influenced on identification word little.
Concrete condition is：
1. when the cable of both γ=0 ° and identification card and background is completely superposed, background is still in hollow out striped；Identification card
Connect with word cable or so, word is in entity mass colour.It due to screen frequency height, visually observes less than cable, therefore feels text
Word is deeper than background color, similar sun word.Otherwise similar cloudy word (when i.e. completely misaligned), as shown in Figure 3.
2. when γ=0 ° and identification card it is higher with the cable overlapping degree of both backgrounds (i.e. between half overlap with completely weight
Close) when, display background cable is thicker, and spacing becomes smaller, and is in still hollow out cable, connects with word cable side, and blank spacing is smaller,
Generate similar characters cut in relief.Otherwise similar characters cut in intaglio (when being overlapped between half and is completely misaligned).
3. when γ=0 ° and identification card with both overlapping degree identical (i.e. half coincidence) when, i.e. word and background hollow out degree
Identical, similar to hidden area, word is hidden at this time.
4. when 0 °<When γ≤10 °, hides content part and occur to reinforce interference, background parts occur to weaken interference, form sun
Text, on the contrary form characters cut in intaglio.With the variation of angle, the two alternately, thus increases the difference for hiding content and background.Its
When middle identification card is identical as the two interference, word content is hidden.
It cannot identified reason when moire formation basic theory analysis rotation angle being used to be more than 10 ° below：
If hidden area cable center spacing is P1, identification card cable center spacing is P2, angle γ.According to formula (1) into
Row calculates, and since the two cable spacing is identical, enables P1=P2=P0, then moire period P=P0/ [2sin (γ/2)], moire direction
α=90 ° ± arccos [Psin γ/P0].From expression formula it is also seen that being inversely proportional with angle in the moire period.Substitute into P0Numerical value
0.127mm, P numerical value are word discrimination 0.73mm, can obtain 10 ° of γ ≈, α=90 ° ± 1.54 °.It is less than when the moire period
When 0.73mm, γ>10 °, text profile be difficult identification, direction close to 90 ° with word screen angle 45 ° differ greatly, so that word is produced
Raw visual deformation, the vision that word is formed with background close to hidden area at this time are distributed.
Embodiment 2
The screening line concealing of step 1 graphical informations：
1.1 design configuration：In conjunction with the contour shape of word, to simple graph transition, such as Electronic University Of Science & Technology Of Hangzhou
School badge center is gradually changed by 4 letter Cs and is constituted, whole as a letter " E ", signifies the head of " electronics " this English word
Letter.4 elegant smoothnesses of letter C, signify Hangzhoupro electricity emancipate the mind, the target of scientific and technical innovation.Dimension of picture size is 20*
20mm。
1.2 visuals select 45 ° of screenings, and screen frequency 175lpi, cable is black so that cable thickness is equal to phase
Adjacent cable is spaced about 0.0726mm, forms striped hollow out figure.
1.3 background parts use the identical meshing method of 1.2 visuals, and are staggered and add with the visuals described in 1.2
Clear area between net, the i.e. extended line of figure screening line cable just adjacent in background overlaps.
1.4 is ensure that graph outline is clear, and 1.2 and 1.3 cable overlap joint meets following rule：
(1) figure horizontal component cable connects with the background cable that top keeps left, and connects with the background cable kept right below.
(2) figure vertical portion cable connects with the background cable of the left side on the lower, and the background cable top with the right connects.
(3) figure does not connect in the cable of turning point and inclined part with background cable, or all connects with both sides cable.
(4) graph curve part, cable, which connects, to be gradient to (1) by (2) or is gradient to (2) by (1).
(5) when visuals profile angle is close to 45 °, cable contour connection is prone to dot gain and papering, so
There are blank, increase cable spacing.
1.5 figures and background printing composition a certain size, the hidden area of shape, hidden area is round rectangle, a length of
20.0mm, width 20.0mm, wide fillet radius of the radian are 1.0mm, and hidden area frame is solid line, wide about 0.25mm.Hidden area
Figure and background discrimination are small, and screen frequency is high, is not easy to be identified by the human eye, has achieved the effect that hiding answer, as shown in Figure 4.
Step 2 identifies graphical information using the moire phenomenon that identification card and hidden area generate：
2.1 according to the size shape and service condition of hidden area：
(1) identification card, the rounded rectangle of identification card, a length of 100.0mm, width 40.0mm, wide fillet radius of the radian are designed
For 4.0mm, hidden area frame is solid line, wide about 0.25mm.It can not only facilitate and read hidden area, be also used as bookmark, such as
Shown in Fig. 1.
(2) material selection of identification card is PET polyester plastics sheet materials, and light transmission is strong, is conducive to that speckle pattern interferometry occurs.
(3) printing ink is UV ink, and UV ink is that one kind not having to solvent, and rate of drying is fast, good luster, bright in luster,
The good ink of water-fast, solvent resistant, wearability.UV ink has become a kind of more ripe ink technology, and pollutant emission is almost
It is zero.UV ink is good in the inking of PET polyester plastics sheet materials, is not easy to take off ink, and Environmental Safety, does not influence user's health.
(4) mode of printing is lithographic printing, since the areas on lithographic printing plate is almost located with non-graphic part
In in approximately the same plane, in printing, in order to make ink distinguish printing elements or non-graphic part, first by printing
The water supply installation of version component supplies water to the non-graphic part of printing plate, to protect the non-graphic part of printing plate not soaked by ink
It is wet.
The part of hidden area for identification of identification card is used meshing method identical with 1.2 by 2.2, and can be with figure and the back of the body
Scape is respectively formed interference fringe, and remainder stamps the picture and text explanation in relation to identification card.
The identification division of identification card is placed with by certain angle in hidden area, profit by 2.3 hand-held identification card picture and text declaratives
Graphical information is read with moire phenomenon, it is as a result as follows：
(1) work as γ>At 5 °, the moire period is less than human eye maximum resolution so that figure deforms, and figure is not easy at this time
Identification.
(2) when γ≤5 °, because figure is identical as background meshing method but printing ink and blank distribution are on the contrary, mobile
Or rotation identification card, the variation of figure light and shade.Select γ=0 ° best, moire is infinitely great at this time, is influenced on identification figure little.Tool
Body situation is：
1. when the cable of both γ=0 ° and identification card and background is completely superposed, background is still in hollow out striped；Identification card
Connect with figure cable or so, figure is in entity mass colour.It due to screen frequency height, visually observes less than cable, therefore feels figure
Shape is deeper than background color, similar positive image.Otherwise similar negative image (when i.e. completely misaligned), as shown in Figure 5.
2. when γ=0 ° and identification card it is higher with the cable overlapping degree of both backgrounds (i.e. between half overlap with completely weight
Close) when, display background cable is thicker, and spacing becomes smaller, and is in still hollow out striped, connects with figure cable side, and blank spacing is smaller,
Generate similar positive image.Otherwise similar negative image (when being overlapped between half and is completely misaligned).
3. when γ=0 ° and identification card with both overlapping degree identical (i.e. half coincidence) when, i.e. figure and background hollow out degree
Identical, similar to hidden area, figure is hidden at this time.
4. when 0 °<When γ≤5 °, visuals occurs to reinforce interference, and background parts occur to weaken interference, form positive image, instead
Formation negative image.With the variation of angle, the two alternately, thus increases the difference of figure and background.Wherein identification card
When identical as the two interference, graphical content is hidden.
It cannot identified reason when moire formation basic theory analysis rotation angle being used to be more than 5 ° below：
If hidden area cable center spacing is P1, identification card cable center spacing is P2, angle γ.According to formula (1) into
Row calculates, and since the two cable spacing is identical, enables P1=P2=P0, then moire period P=P0/ [2sin (γ/2)], moire direction
α=90 ° ± arccos [Psin γ/P0].From expression formula it is also seen that the moire period is inversely proportional with angle.Substitute into P0Numerical value
0.145mm, P numerical value are that graph area indexes 1.65mm, can obtain 5 ° of γ ≈, α=90 ° ± 0.99 °.It is less than 1.65mm when the moire period
When, γ>5 °, graph outline be difficult identification, direction close to 90 ° with figure screen angle 45 ° differ greatly, make figure generation visually
Deformation, figure and background form the vision distribution close to hidden area at this time.
Embodiment 3
The screening line concealing of step 1 pictograph information：
1.1 design configuration words：It is big to simple graph transition, such as Hangzhou electronics technology in conjunction with the contour shape of word
School badge center is gradually changed by 4 letter Cs and is constituted, whole as a letter " E ", signifies " electronics " this English word
Initial.4 elegant smoothnesses of letter C, signify Hangzhoupro electricity emancipate the mind, the target of scientific and technical innovation.Word is designed around figure,
Content is the Chinese and English of school name and time for school building.The font size of word is designed, Chinese " Electronic University Of Science & Technology Of Hangzhou " is No. five
Handwritten form, English " HANGZHOU DIANZI UNIVERSITY " No. five Arial, digital " 1956 " are No. six Times New
Roman.Size of population is 40*40mm.
1.2 pictograph parts select 45 ° of screenings, and screen frequency 175lpi, cable is black so that cable thickness etc.
It is spaced about 0.0726mm in adjacent cable, forms striped hollow out figure word.
1.3 background parts use the identical meshing method in 1.2 pictograph parts, and with the pictograph portion described in 1.2
Misclassification opens screening, i.e. clear area between the extended line of pictograph screening line cable just adjacent in background overlaps.
1.4 is ensure that pictograph is clear-cut, and 1.2 and 1.3 cable overlap joint meets following rule：
(1) pictograph horizontal component cable connects with the background cable that top keeps left, with the background cable kept right below
Connect.
(2) pictograph vertical portion cable connects with the background cable of the left side on the lower, the background cable top with the right
Connect.
(3) pictograph does not connect in the cable of turning point and inclined part with background cable, or all with both sides cable
Connect.
(4) pictograph curved portion, cable, which connects, to be gradient to (1) by (2) or is gradient to (2) by (1).
(5) when pictograph partial contour angle is close to 45 °, cable contour connection is prone to dot gain and papering,
So there are blank, increase cable spacing.
1.5 pictographs and background printing composition a certain size, the hidden area of shape, hidden area is round rectangle, a length of
40.0mm, width 40.0mm, wide fillet radius of the radian are 1.0mm, and hidden area frame is solid line, wide about 0.25mm.Hidden area
Pictograph and background discrimination are small, and screen frequency is high, is not easy to be identified by the human eye, has achieved the effect that hiding answer, such as Fig. 6 institutes
Show.
Step 2 identifies pictograph information using the moire phenomenon that identification card and hidden area generate：
2.1 according to the size shape and service condition of hidden area：
(1) identification card, the rounded rectangle of identification card, a length of 100.0mm, width 40.0mm, wide fillet radius of the radian are designed
For 4.0mm, hidden area frame is solid line, wide about 0.25mm.It can not only facilitate and read hidden area, be also used as bookmark, such as
Shown in Fig. 1.
(2) material selection of identification card is PET polyester plastics sheet materials, and light transmission is strong, is conducive to that speckle pattern interferometry occurs.
(3) printing ink is UV ink, and UV ink is that one kind not having to solvent, and rate of drying is fast, good luster, bright in luster,
The good ink of water-fast, solvent resistant, wearability.UV ink has become a kind of more ripe ink technology, and pollutant emission is almost
It is zero.UV ink is good in the inking of PET polyester plastics sheet materials, is not easy to take off ink, and Environmental Safety, does not influence user's health.
(4) mode of printing is lithographic printing, since the areas on lithographic printing plate is almost located with non-graphic part
In in approximately the same plane, in printing, in order to make ink distinguish printing elements or non-graphic part, first by printing
The water supply installation of version component supplies water to the non-graphic part of printing plate, to protect the non-graphic part of printing plate not soaked by ink
It is wet.
The part of hidden area for identification of identification card is used meshing method identical with 1.2 by 2.2, and can be with picture and text and the back of the body
Scape is respectively formed interference fringe, and remainder stamps the picture and text explanation in relation to identification card.
The identification division of identification card is placed with by certain angle in hidden area, profit by 2.3 hand-held identification card picture and text declaratives
Pictograph information is read with moire phenomenon, it is as a result as follows：
(1) work as γ>At 5 °, hiding content deforms, and the moire period is small, and character and graphic is not easy to identify.
(2) when γ≤5 ° because hide that content is identical with background meshing method but printing ink and blank are distributed on the contrary,
Mobile or rotation identification card hides content light and shade variation.Concrete condition is：
1. when the cable of both γ=0 ° and identification card and background is completely superposed, background is still in hollow out striped；Identification card
Connect with hiding content cable or so, it is in entity mass colour to hide content.Due to screen frequency height, visually observe less than cable, because
This feels that hiding content is deeper than background color, similar positive image text.Otherwise similar negative image text (when i.e. completely misaligned), such as Fig. 7
It is shown.
2. when γ=0 ° and identification card it is higher with the cable overlapping degree of both backgrounds (i.e. between half overlap with completely weight
Close) when, display background cable is thicker, and spacing becomes smaller, and is in still hollow out cable, connects with hiding content cable side, blank spacing
It is smaller, generate similar positive image text.Otherwise similar negative image text (when being overlapped between half and is completely misaligned).
3. when γ=0 ° and identification card (i.e. half overlaps) identical as the two overlapping degree, that is, hide content and background hollow out
Degree is identical, similar to hidden area, and character and graphic is hidden at this time.
4. when 0 °<When γ≤5 °, hides content part and occur to reinforce interference, background parts occur to weaken interference, form sun
Picture and text, on the contrary form negative image text.With the variation of angle, the two alternately, thus increases the area for hiding content and background
Not.When wherein identification card is identical as the two interference, graph-text content is hidden.
It cannot identified reason when moire formation basic theory analysis rotation angle being used to be more than 5 ° below：
If hidden area cable center spacing is P1, identification card cable center spacing is P2, angle γ.According to formula (1) into
Row calculates, and since the two cable spacing is identical, enables P1=P2=P0, then moire period P=P0/ [2sin (γ/2)], moire direction
α=90 ° ± arccos [Psin γ/P0].From expression formula it is also seen that the moire period is inversely proportional with angle.Substitute into P0Numerical value
0.145mm, P numerical value are pictograph discrimination 1.65mm, can obtain 5 ° of γ ≈, α=90 ° ± 0.99 °.It is less than when the moire period
When 1.65mm, γ>5 °, pictograph profile be difficult identification, direction close to 90 ° with pictograph screen angle 45 ° differ greatly, make
Pictograph generates visual deformation, and pictograph forms the vision distribution close to hidden area with background at this time.
Above-described embodiment is not for the limitation of the present invention, and the present invention is not limited only to above-described embodiment, as long as meeting
The present invention claims all belong to the scope of protection of the present invention.
Claims (5)
1. a method of identifying hidden text figure using moire phenomenon, it is characterised in that：
Hiding content and background on the hidden area hiding to needs are all made of screen angle δ and carry out screening, screen frequency 175
~200lpi, cable are black so that striped thickness is equal to fringe spacing, forms striped hollow out character and graphic；And hide content
Striped is in staggered distribution with background striped；Striped thickness is 0.0635~0.0726mm, δ=40 °~50 °；
Identification card uses meshing method identical with hidden area, and is respectively formed interference fringe with hiding content and background；
Identification card is placed on hidden area, is read using moire phenomenon and hides content partial information；
To ensure that it is clear-cut that hiding content is shown, the cable splicing detailed design satisfaction for hiding content and background is as follows：
It wherein hides word segment in content and meets following rule：
(1) when strokes of characters is " cross ", cable connects with the background cable that top keeps left in " cross ", with the background net kept right below
Line connects；
(2) when strokes of characters is " perpendicular ", cable connects with the background cable of the left side on the lower in " perpendicular ", the background net top with the right
Line connects；
(3) strokes of characters does not connect in the cable of turning point and inclined stroke with background cable, or all connects with both sides cable；
(4) when strokes of characters is " slash ", " right-falling stroke ", cable connects is gradient to rule (1) by rule (2)；
(5) when 45 ° of strokes of characters angle, stroke cable contour connection is prone to dot gain and papering, so there are blank,
Increase cable spacing；
It hides visuals in content and meets following rule：
(1) figure horizontal component cable connects with the background cable that top keeps left, and connects with the background cable kept right below；
(2) figure vertical portion cable connects with the background cable of the left side on the lower, and the background cable top with the right connects；
(3) figure does not connect in the cable of turning point and inclined part with background cable, or all connects with both sides cable；
(4) graph curve part, cable, which connects, to be gradient to rule (1) by rule (2) or is gradient to rule (2) by rule (1)；
(5) when 45 ° of visuals profile angle, cable contour connection is prone to dot gain and papering, so there are blank,
Increase cable spacing.
2. a kind of method identifying hidden text figure using moire phenomenon as described in claim 1, it is characterised in that described
Identification card material be phenolic aldehyde polyester plastics sheet material.
3. a kind of method identifying hidden text figure using moire phenomenon as described in claim 1, it is characterised in that use
Printing ink be UV ink.
4. a kind of method identifying hidden text figure using moire phenomenon as described in claim 1, it is characterised in that use
Mode of printing be lithographic printing.
5. a kind of method identifying hidden text figure using moire phenomenon as described in claim 1, it is characterised in that work as knowledge
Not Ka on cable moire phenomenon occurs respectively when being superimposed with the cable in hiding content and background, cable angle is γ, and γ ' is
The phenomenon that identification critical angle in γ, generation includes as follows：
(1) work as γ>When γ ', hiding content deforms, and the moire period is small, and character and graphic is not easy to identify；
(2) as γ≤γ ', because hiding content is identical as background meshing method but printing ink and blank distribution are on the contrary, move
Dynamic identification card hides content light and shade variation；Concrete condition is：
1. when the cable of γ=0 ° and identification card and background is completely superposed, background is still in hollow out striped；Identification card with hide in
Hold cable or so to connect, it is in entity mass colour to hide content；Due to screen frequency height, visually observe less than cable, therefore feel hidden
Content is hidden than background color depth, forms positive image text；When the cable of both γ=0 ° and identification card and background is completely misaligned, shape
At negative image text；
2. when the cable overlapping degree of γ=0 ° and identification card and background is higher, display background cable is thicker, and spacing becomes smaller, and hidden
It hides content cable side to connect, blank spacing is smaller, and background is still in hollow out striped, generates positive image text；When γ=0 ° and identification card
When relatively low with the cable overlapping degree of background, negative image text is formed；
The higher reference of above-mentioned identification card and the cable overlapping degree of both backgrounds is not wrapped between half is overlapped and is completely superposed
Include the case where being completely superposed；
When identification card overlaps between half with the relatively low reference of the cable overlapping degree of both backgrounds and is completely misaligned, but do not included
Complete misaligned situation；
3. when γ=0 ° and identification card identical as both hiding content, background overlapping degree, that is, hide content and background hollow out journey
Spend it is identical, at this time character and graphic hide；
4. when 0 °<When γ≤γ ', hides content part and occur to reinforce interference, background parts occur to weaken interference, form positive image
Text；It hides content part to occur to weaken interference, background parts occur to reinforce interference, form negative image text；Wherein identification card with hide
When the interference of both content, background is identical, graph-text content is hidden.
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