CN101510049A - Grid point making method for lenticular screen three-dimensional printed chart - Google Patents

Abstract

The invention relates to a method for manufacturing printing dots of a lenticular grating stereoscopic printing map, which effectively solves the problems of improving the definition and stereoscopic impression of the lenticular grating printing map; the method thereof is as follows: according to the number of lines of used grating plates, the resolution of an output device, and the number of rows of laser points which are generated by each view, the number of images in accordance with the subdivision by visual angle and a printing dot manufacture model are determined; the computer is used for programming so as to obtain a printing dot generating program 3D-RIP which is implemented by the computer for obtaining the printing dot binary image of each color version; a film manuscript of the image is sent to a compositor by a laser typesetter or the printing version is output by a direct computer plate-making machine; the printing dot is output onto the film or the printing version; and by using a stereoscopic map printing method, a printing product of high definition and super-strong stereoscopic sense is obtained. The method is simple and easy for operation, greatly improves the expressive ability of the grating stereoscopic printing products, enhances the quality and competitiveness of the products, saves the production consumables, has broad application prospects, and enormous economic and social benefits.

Description

The site method for making of a kind of column mirror grating stereo printing figure

One, technical field

The present invention relates to print field, the site method for making of particularly a kind of column mirror grating stereo printing figure.

Two, technical background

Raising day by day along with development of science and technology and people's living standard, the variation of print product and personalized, the column mirror grating stereo print product is also more and more by promotion and application, and present employed printing net-point remains conventional amplitude modulation site or frequency-modulation halftone dot, because the singularity of stereo-picture in expression, adopt conventional site then can reduce the sharpness and the stereoscopic sensation of image greatly, so conventional site is not suitable for printing column mirror grating stereo figure, develop a kind of new site method for making so?

Three, summary of the invention

At above-mentioned situation, for overcoming the prior art defective, the present invention's purpose just provides the site method for making of a kind of column mirror grating stereo printing figure, can effectively solve the sharpness and the relief problem that improve column mirror grating stereo printing figure, the technical scheme of its solution is, line number according to the original screen panel that uses, row's number of the laser spots that output device resolution and every width of cloth view generate, determine the quantity of image by the visual angle framing, and site analogue formation, use computer programming, get site generator program 3D-RIP, carry out this program by computing machine, get version of all kinds site bianry image, this image is sent a manuscript to the compositor film or exported galley by computer direct platemaking machine by laser photocomposing machine, just the site can be outputed on film or the galley, then, adopt the stereographic map printing process, can obtain high definition and superpower relief printed matter.The inventive method is simple, easy to operate, has improved the expressive ability of grating stereo print product greatly, has improved product quality and competitiveness, saving and produce consumptive material, create more Peak output, is that one on the press is created greatly, have broad application prospects, economic and social benefit is huge.

Four, description of drawings

Fig. 1 is a process chart of the present invention.

Fig. 2 is the blank map (order that on behalf of laser spots, the direction of broken line fill) of site of the present invention growth model order one.

Fig. 3 is the blank map (order that on behalf of laser spots, the direction of broken line fill) of site of the present invention growth model order two.

Fig. 4 is site error compensation model figure of the present invention.

Fig. 5 is site of the present invention growth model 1 figure.

Fig. 6 is site of the present invention growth model 2 figure.

Five, embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.

Provided by Fig. 1-Fig. 6, the present invention is realized by following steps:

(1), at first makes three-dimensional view by common color image or stereogram, according to the grid stroke number, row's number of sending a manuscript to the compositor the laser spots that device resolution, every width of cloth view generate calculates the quantity of image by the visual angle framing, be the quantity of view, and be treated to raster image with the grating image making software, if send a manuscript to the compositor device resolution and be r (unit be a little/per inch), the grid stroke number is f (unit is line/inch), the quantity of view is that (unit is the width of cloth to a, be integer), every width of cloth view generates n row laser spots (n is an integer), and then the relation between them is determined by formula (1):

R ≈ anf formula (1),

The value of the right and left is approaching more, and the sharpness of the stereo-picture that is generated is just high more, and stereoscopic sensation is also strong more;

(2), the site model is carried out mathematical modeling, method for building up is:

(1) determines the size of unit, site

1), differentiate the computing formula of object ability, determines the height of unit, site according to human eye;

If the distance between two impact points is that (L is the interval of unit, two sites to L, the i.e. height of unit, a site), the distance of eye-observation impact point is P, then when satisfying the computing formula (2) of human eye resolution object ability between L and the P, it is two impact points that human eye will no longer be told them, and regards it as impact point;

$\frac{L}{P}\≤\frac{1}{1500}$ Formula (2),

Generally, the viewing distance of stereographic map is far away, is (being P 〉=300) more than 300 millimeters, and substitution formula (2) can calculate, and the height L of unit, site should be smaller or equal to 300/1500, promptly 0.2 millimeter;

2), according to the resolution of output device, determine that the site cell height is that the laser of 0.2 millimeter correspondence is counted;

If output device resolution is r (unit be a little/per inch), the laser m that counts is calculated by formula (3):

$m=\frac{0.2r}{25.4}$ Formula (3),

Generally speaking, the output resolution ratio of output device is set to 2400 point/inches or 2540 point/inches, and when r=2540,0.2 millimeter site cell height should be made up of 20 laser spots, i.e. m=20;

(2) determine the site growth model

The site growth model is provided by Fig. 2, Fig. 3, the unit, site is made up of m * n laser spots, scheme medium and small box indicating site laser spots to be filled when generating, the order that on behalf of laser spots, the direction of broken line fill, black channel, cyan passage, magenta passage, yellow channels are filled laser spots separately in sequence, and two kinds of fill orders are arranged:

Order one: at m * n laser spots, black channel, cyan passage, magenta passage, yellow channels are respectively since the 5th row, the 10th row, the 15th row, the 20th row's laser spots, by from left to right, series arrangement after top row is full, is arranged downwards more from bottom to top, in the making of same width of cloth figure, the site arranged model of four Color Channels can exchange, but the model of four passages can not be identical, sees Fig. 2;

Order two: at m * n laser spots, black channel and cyan passage since the 3rd and the 8th row's laser spots, by from left to right, are arranged respectively from bottom to top, after top row is full, arrange downwards again; The magenta passage since the 14th and the 19th row's laser spots, by from left to right, is arranged respectively from top to bottom, after below row is full, arrange upward again, in the making of same width of cloth figure, the site arranged model of four Color Channels can exchange, but the model of four passages can not be identical, sees Fig. 3;

(3) gray level of ruleization image makes it and adds pessimistic concurrency control to be complementary, and method is:

1), asks original copy pixel grey scale mean value

According to the resolution of original copy, determine the number of the original copy pixel of unit, site correspondence, and pixel grey scale is averaged;

If the resolution of original copy is φ (unit be a little/inch), output device resolution is r (unit be a little/inch), and m is the number of laser spots on the site cell height, and then the number λ of the original copy pixel of unit, site correspondence is provided by formula (4);

$\mathrm{\λ}=\frac{\mathrm{\φ}}{r}\·m$ Formula (4),

From the original copy upper left side, vertically getting every λ pixel, to carry out gray-scale value average, and establishing wherein, the gray-scale value of any one pixel is G _i, try to achieve average gray value by formula (5)

, the position that should fill when this value decision generates in the site;

$\stackrel{\‾}{G}=\frac{1}{\mathrm{\λ}}\underset{1}{\overset{\mathrm{\λ}}{\mathrm{\Σ}}}{G}_i$ Formula (5);

2), the numerical value interval of average gray value is adjusted to determine filling position

If the bit depth of each passage of original image is b, the number of greyscale levels of image is 2b, promptly 0≤

≤ 2 ^b-1, because the laser that unit, a site is comprised is counted to m * n, can only represent m * n gray level, so, when filling the site by gray level, must be with 0 to 2 ^bThe average gray value of the interval expression of-1 numerical value is adjusted to the interval expression of 1 to m * n numerical value by the output linearization relation of film setter or direct platemaking machine, uses

Represent adjusted gray-scale value, represent to export the linearization relational matrix, then calculate by formula (6) with Ψ:

$\stackrel{\‾}{G}\′=\frac{\stackrel{\‾}{G}}{2^b}\·m\·n\·\mathrm{\Ψ}$ (1≤G '≤mn) formula (6),

The round off round numbers, and in the generation model of site, find out the filling sequence number identical with this value, fill smaller or equal to the sequence number position of this value, and do not fill greater than the sequence number position of this value.

3), site error compensation

The average gray value that obtains by formula (5)

Round off rounds, and has certain error, in order to remedy this error, when calculating, adopts the site error compensation model to compensate;

(3), write site generator program (3D-RIP program) by above-mentioned site model;

(4), the grating stereo view file of making carried out screening handle in site generator program (3D-RIP program), obtain branch version two-value halftone dot image;

(5), the branch version two-value halftone dot image of above-mentioned generation is outputed on the film by laser photocomposing machine, printing down obtains galley or makes galley by computer direct platemaking machine;

(6), adopt common printed method, picture and text are printed onto on the paper, and then cold mounting on the original screen panel, promptly obtain having high definition and superpower relief grating stereo printing figure, for 75 line/inches original screen panel of above (comprising 75 line/inches), can also adopt UV printing machine (being a kind of printing machine) directly on original screen panel, to be printed as figure with the ultraviolet drying device;

Said site error compensation model has two kinds, a model and b model, as shown in Figure 4.The a model is error amount to be compensated to respectively on " four sites of this right side, site and below ", its method is: if given up a certain value in calculating, then allow its four sites on every side add 1/4 of this value respectively, otherwise, if let it pass a certain value in calculating, then allow its four sites on every side deduct 1/4 of this value respectively more; The b model is that error amount is compensated to respectively on one on this right side, site and two (three) sites, below totally, its method is: if given up a certain value in calculating, then allow the site on right side add 1/2 of this value, two sites of below add 1/4 of this value respectively, if let it pass a certain value in calculating more, then allow three sites around it deduct corresponding value respectively, said " four sites of this right side, site and below " are meant with the target site and are in neighbour node on the same view; " this right side, site one and two (totally three) sites, below " also is meant with the target site and is in neighbour node on the same view.

Embodiment 1:

(1), with 70 lines/inch grating, on the direct platemaking machine of Heidelberg TopSetter102, directly make a plate with the resolution of 2400 point/inches, adopt formula (1), obtain:

$a\·n\≈\frac{2400}{70}$

a·n≈34

$a\≈\frac{34}{n},$

By above calculating as can be known:

With 70 lines/inch grating, 2400 points/inch output device output, when every width of cloth view generated 1 row's laser spots (n=1), the three-dimensional view quantity of required making was 34 width of cloth; When every width of cloth view generated 2 row's laser spots (n=2), the three-dimensional view quantity of required making was 17 width of cloth, in the present embodiment, gets n=2;

(2), the site model is carried out mathematical modeling, method for building up is:

(1) determines the size of unit, site

1), differentiate the computing formula of object ability, determines the height of unit, site according to human eye.

Draw by formula (2):

$\frac{L}{P}\≤\frac{1}{1500}$ Formula (2)

Generally, the viewing distance of stereographic map is (being P 〉=300) more than 300 millimeters, substitution formula (2) but computing machine go out, the height L of unit, site should be smaller or equal to 300/1500, promptly 0.2 millimeter;

2), according to the resolution of output device, determine that the site cell height is that the laser of 0.2 millimeter correspondence is counted;

Send a manuscript to the compositor with 2400 points/inch output device, the laser m that counts is calculated by formula (2):

$m=\frac{0.2\×2400}{25.4}\≈20,$

(2) determine the site growth model

The unit, site is made up of m * n laser spots, is determined m=20 by above condition, n=2, unit, a site is made up of 40 laser spots, the rule of the site growth model that provides according to Fig. 2, the fill order of 40 laser spots can be numbered, draw site growth model 1, as shown in Figure 5;

Laser spots to be filled when the box indicating site generates in the accompanying drawing 5, numeral in the frame is a fill order, and black channel, cyan passage, magenta passage, yellow channels are all pressed 40 laser spots filling modes and generated sites, but when growing in the site, reference position difference, fill order are also different.The reference position that provides among the figure is: black channel, cyan passage, magenta passage, yellow channels are respectively since the 5th row, the 10th row, the 15th row, the 20th row's laser spots, by from left to right, series arrangement from bottom to top, after top row is full, arrange downwards again, in the making of same width of cloth figure, the site arranged model of four Color Channels can exchange, but the model of four passages can not be identical;

(3) gray level of ruleization image makes it and adds pessimistic concurrency control to be complementary, and method is:

Original copy adopts 17 width of cloth views, and image resolution ratio φ is 1200 point/inches, and output device resolution is that r is 2400 point/inches;

1), asks original copy pixel grey scale mean value

The number λ of the original copy pixel of unit, site correspondence is obtained by formula (4);

$\mathrm{\λ}=\frac{\mathrm{\φ}}{r}\×20=\frac{1200}{2400}\×20=10$ Formula (4),

From the original copy upper left side, vertically getting per 10 pixels, to carry out gray-scale value average, tries to achieve average gray value by formula (5)

, the position that should fill when this value decision generates in the site;

$\stackrel{\‾}{G}=\frac{1}{10}\underset{1}{\overset{10}{\mathrm{\Σ}}}{G}_i$ Formula (5);

2), the numerical value interval of average gray value is adjusted to determine filling position

If the bit depth of each passage of original image is 8, the number of greyscale levels of image is 2 ⁸=256, promptly 0≤

≤ 255, be 20 * 2=40 because the laser that unit, a site is comprised is counted, so, when filling the site, must with 256 gray level ruleization on 40 gray levels, use by gray level

Gray-scale value after the expression ruleization because the linearization relational matrix Ψ of the direct platemaking machine of Heidelberg TopSetter102 is a unit matrix, is calculated by formula (6):

$\stackrel{\‾}{G}\′=\frac{\stackrel{\‾}{G}}{2^b}\·m\·n\·\mathrm{\Ψ}=\frac{\stackrel{\‾}{G}}{256}\×40,$

Calculated value between 0 to 255, when the average gray value of a cyan path 10 pixel

Be 123 o'clock, press following formula and calculate, get gray-scale value

Be 19.2, this value is looked for respective value in the site model of cyan passage correspondence, it is between the 19-20, round off, get 19, then every laser spots smaller or equal to 19 position is all filled, and does not fill greater than the laser spots of 19 position, and obtaining average gray value thus is site corresponding on 123 positions;

3), site error compensation

The average gray value that obtains by formula (5)

Round off rounds, and has certain error, in order to remedy this error, when calculating, adopts the site error compensation model to compensate;

Adopt a model among Fig. 4 to carry out site error compensation, the a model is error amount to be compensated to respectively on " four sites of this right side, site and below ", its method is: in above-mentioned result of calculation with formula (5), given up 0.2, then allow its four sites on every side add 1/4 of this value respectively, i.e. 0.2 * 1/4=0.05, said among Fig. 4 " four sites of this right side, site and below " are meant with the target site and are in neighbour node on the same view, in the present embodiment, the view that adopts is 17 width of cloth, so laterally in former figure just can find neighbor on the same width of cloth view every 17 pixels;

(3), write site generator program (3D-RIP program) by above-mentioned site model;

(4), the grating stereo view file of making carried out screening handle in site generator program (3D-RIP program), obtain branch version two-value halftone dot image;

(5), the branch version two-value halftone dot image of above-mentioned generation is outputed on the film by laser photocomposing machine, printing down obtains galley or makes galley by computer direct platemaking machine;

(6), adopt common printed method, picture and text are printed onto on the paper, and then cold mounting on the original screen panel, promptly obtain having high definition and superpower relief grating stereo printing figure.

Embodiment 2:

(1), with 75 lines/inch grating, on the direct platemaking machine of Heidelberg TopSetter102, directly make a plate with the resolution of 2400 point/inches, adopt formula (1), obtain:

$a\·n=\frac{2400}{75}$

a·n＝34

$a=\frac{34}{n},$

By above calculating as can be known:

With 75 lines/inch grating, 2400 points/inch output device output, when every width of cloth view generated 4 row's laser spots (n=4), the three-dimensional view quantity of required making was 8 width of cloth;

(2), the site model is carried out mathematical modeling, method for building up is:

(1) determines the size of unit, site

1), differentiate the computing formula of object ability, determines the height of unit, site according to human eye;

Draw by formula (2):

$\frac{L}{P}\≤\frac{1}{1500}$ Formula (2),

Generally, the viewing distance of stereographic map is (being P 〉=300) more than 300 millimeters, substitution formula (2) but computing machine go out, the height L of unit, site should be smaller or equal to 300/1500, promptly 0.2 millimeter;

2), according to the resolution of output device, determine that the site cell height is that the laser of 0.2 millimeter correspondence is counted;

Send a manuscript to the compositor with 2400 points/inch output device, the laser m that counts is calculated by formula (2):

$m=\frac{0.2\×2400}{25.4}\≈20,$

(2) determine the site growth model

The unit, site is made up of m * n laser spots, is determined m=20 by above calculating, n=4, unit, a site is made up of 80 laser spots, the site growth model rule that provides according to Fig. 3, the fill order of 80 laser spots can be numbered, draw site growth model 2, as shown in Figure 6;

Pixel to be filled when the box indicating site generates in the accompanying drawing 6, numeral in the frame is a fill order, black channel, cyan passage, magenta passage, yellow channels are all pressed 80 laser spots filling modes and are generated sites, but when growing in the site, the reference position difference, fill order is also different, the reference position that provides among the figure is: black channel and cyan passage since the 3rd and the 8th row's laser spots, by from left to right, are arranged respectively from bottom to top, after top row is full, arrange downwards again; The magenta passage since the 14th and the 19th row's laser spots, by from left to right, is arranged respectively from top to bottom, after below row is full, arranges upward again.In the making of same width of cloth figure, the site arranged model of four Color Channels can exchange, but the model of four passages can not be identical;

(3) gray level of ruleization image makes it and adds pessimistic concurrency control to be complementary, and method is:

Original copy adopts 8 width of cloth views, and image resolution ratio φ is 600 point/inches, and output device resolution is that r is 2400 point/inches;

1), asks original copy pixel grey scale mean value

The number λ of the original copy pixel of unit, site correspondence is obtained by formula (4):

$\mathrm{\λ}=\frac{\mathrm{\φ}}{r}\×20=\frac{600}{2400}\×20=5$ Formula (4),

From the original copy upper left side, getting vertically per 5 pixels, to carry out gray-scale value average, tries to achieve average gray value by formula (5)

, the position that should fill when this value decision generates in the site;

$\stackrel{\‾}{G}=\frac{1}{5}\underset{1}{\overset{5}{\mathrm{\Σ}}}{G}_i$ Formula (5),

2), the numerical value interval of average gray value is adjusted to determine filling position

If the bit depth of each passage of original image is 8, the number of greyscale levels of image is 2 ⁸=256, be 20 * 4=80 because the laser that unit, a site is comprised is counted, so, when filling the site, must with 256 gray level ruleization on 80 gray levels, use by gray level

Expression because the linearization relational matrix Ψ of the direct platemaking machine of Heidelberg TopSetter102 is a unit matrix, is calculated by formula (6):

$\stackrel{\‾}{G}\′=\frac{\stackrel{\‾}{G}}{2^b+1}\·m\·n\·\mathrm{\Ψ}=\frac{\stackrel{\‾}{G}}{256}\×80,$

Calculated value between 0 to 255, for example, when the average gray value of 5 pixels of cyan passage

Be 95 o'clock, press following formula and calculate, get gray-scale value

Be 29.6, this value is looked for respective value in the site model of cyan passage correspondence, it is between the 29-30, round off, get 30, then every laser spots smaller or equal to 30 position is all filled, and does not fill greater than the laser spots of 30 position, and obtaining average gray value thus is site corresponding on 95 positions;

3), site error compensation

The average gray value that obtains by formula (5)

Round off rounds, and has certain error, in order to remedy this error, when calculating, adopts the site error compensation model to compensate;

Adopt the b model in the site error compensation model shown in Figure 4 to carry out error compensation, the b model is that error amount is compensated to respectively on one on this right side, site and two (three) sites, below totally, in formula (5) result of calculation, calculated 0.4 more, then allow the site on right side deduct 0.4 1/2, promptly 0.2, the below two sites deduct respectively 0.4 1/4, promptly 0.1, in the present embodiment, the quantity of view is 8 width of cloth, so in former figure, laterally just can find with the target site every 8 row's pixels to be in neighbour node on the same view;

(3), write site generator program (3D-RIP program) by above-mentioned site model;

(4), the grating stereo view file of making carried out screening handle in site generator program (3D-RIP program), obtain branch version two-value halftone dot image;

(5), the branch version two-value halftone dot image of above-mentioned generation is outputed on the film by laser photocomposing machine, printing down obtains galley or makes galley by computer direct platemaking machine;

(6), adopt common printed method, picture and text are printed onto on the paper, and then cold mounting on the original screen panel, promptly obtain having high definition and superpower relief grating stereo printing figure.

Claims (5)

1, the site method for making of a kind of column mirror grating stereo printing figure is characterized in that, is realized by following steps:

(1), at first makes three-dimensional view by common color image or stereogram, according to the grid stroke number, row's number of sending a manuscript to the compositor the laser spots that device resolution, every width of cloth view generate calculates the quantity of image by the visual angle framing, be the quantity of view, and be treated to raster image with the grating image making software, if send a manuscript to the compositor device resolution is r, r unit be a little/per inch, the grid stroke number is f, f unit is line/inch, the quantity of view is a, a unit is the width of cloth, and every width of cloth view generates n row laser spots, and then the relation between them is determined by formula (1):

R ≈ anf formula (1),

The value of the right and left is approaching more, and the sharpness of the stereo-picture that is generated is just high more, and stereoscopic sensation is also strong more;

(2), the site model is carried out mathematical modeling, method for building up is:

(1) determines the size of unit, site

1), differentiate the computing formula of object ability, determines the height of unit, site according to human eye;

If the distance between two impact points is L, the distance of eye-observation impact point is P, and then when satisfying human eye between L and the P and differentiate the computing formula (2) of object ability, it is two impact points that human eye will no longer be told them, and regards it as impact point;

$\frac{L}{P}\≤\frac{1}{1500}$ Formula (2),

The viewing distance of stereographic map is far away, more than 300 millimeters, and P 〉=300, substitution formula (2) can calculate, and the height L of unit, site is smaller or equal to 300/1500, promptly 0.2 millimeter;

2), according to the resolution of output device, determine that the site cell height is that the laser of 0.2 millimeter correspondence is counted;

If output device resolution is r, the laser m that counts is calculated by formula (3):

$m=\frac{0.2r}{25.4}$ Formula (3),

The output resolution ratio of output device is set to 2400 point/inches or 2540 point/inches, and when r=2540,0.2 millimeter site cell height is made up of 20 laser spots, i.e. m=20;

(2) determine the site growth model

The unit, site is made up of m * n laser spots, and black channel, cyan passage, magenta passage, yellow channels are filled laser spots separately in sequence, and two kinds of fill orders are arranged:

Order one: at m * n laser spots, black channel, cyan passage, magenta passage, yellow channels are respectively since the 5th row, the 10th row, the 15th row, the 20th row's laser spots, by from left to right, series arrangement from bottom to top, after top row is full, arrange downwards again, in the making of same width of cloth figure, the site arranged model of four Color Channels can exchange, but the model of four passages can not be identical;

Order two: at m * n laser spots, black channel and cyan passage since the 3rd and the 8th row's laser spots, by from left to right, are arranged respectively from bottom to top, after top row is full, arrange downwards again; The magenta passage since the 14th and the 19th row's laser spots, by from left to right, is arranged respectively from top to bottom, after below row is full, arrange upward again, in the making of same width of cloth figure, the site arranged model of four Color Channels can exchange, but the model of four passages can not be identical;

(3) gray level of ruleization image makes it and adds pessimistic concurrency control to be complementary, and method is:

1), asks original copy pixel grey scale mean value

According to the resolution of original copy, determine the number of the original copy pixel of unit, site correspondence, and pixel grey scale is averaged;

If the resolution of original copy is φ, the unit of φ be a little/inch, output device resolution is r, the unit of r be a little/inch, m is the number of laser spots on the site cell height, then the number λ of the original copy pixel of unit, site correspondence is provided by formula (4);

$\mathrm{\λ}=\frac{\mathrm{\φ}}{r}\·m$ Formula (4),

From the original copy upper left side, vertically getting every λ pixel, to carry out gray-scale value average, and establishing wherein, the gray-scale value of any one pixel is G _i, try to achieve average gray value by formula (5)

, the position that should fill when this value decision generates in the site;

$\stackrel{\‾}{G}=\frac{1}{\mathrm{\λ}}\underset{1}{\overset{\mathrm{\λ}}{\mathrm{\Σ}}}{G}_i$ Formula (5);

2), the numerical value interval of average gray value is adjusted to determine filling position

If the bit depth of each passage of original image is b, the number of greyscale levels of image is 2 ^b, promptly 0≤

≤ 2 ^b-1, because the laser that unit, a site is comprised is counted to m * n, can only represent m * n gray level, so, when filling the site, with 0 to 2 by gray level ^bThe average gray value of the interval expression of-1 numerical value is adjusted to the interval expression of 1 to m * n numerical value by the output linearization relation of film setter or direct platemaking machine, uses

Represent adjusted gray-scale value, Ψ represents to export the linearization relational matrix, is got by formula (6):

$\begin{array}{cc}\stackrel{\‾}{G}\′=\frac{\stackrel{\‾}{G}}{2^b}\·m\·n\·\mathrm{\Ψ}& (1\≤\stackrel{\‾}{G}\′\≤m\·n)\end{array}$ Formula (6),

The round off round numbers, and in the generation model of site, find out the filling sequence number identical with this value, fill smaller or equal to the sequence number position of this value, and greater than not filling the sequence number position of this value;

3), site error compensation

The average gray value that obtains by formula (5)

Round off rounds, and has certain error, when calculating, adopts the site error compensation model to compensate;

(3), write the site by above-mentioned site model and generate the 3D-RIP program;

(4), the grating stereo view file of making is carried out screening in the generator program of site and handle score version two-value halftone dot image;

(5), the branch version two-value halftone dot image of above-mentioned generation is outputed on the film by laser photocomposing machine, printing down obtains galley or makes galley by computer direct platemaking machine;

(6), picture and text are printed onto on the paper, and then cold mounting on the original screen panel, promptly obtain having high definition and superpower relief grating stereo printing figure, or, adopt the UV printing machine directly on original screen panel, to be printed as figure for the above original screen panel of 75 line/inches.

2, the site method for making of column mirror grating stereo printing figure according to claim 1, it is characterized in that, said site error compensation model has two kinds, a model and b model, the a model is error amount to be compensated to respectively on " four sites of this right side, site and below ", its method is: if given up a certain value in calculating, then allow its four sites on every side add 1/4 of this value respectively, otherwise, if let it pass a certain value in calculating, then allow its four sites on every side deduct 1/4 of this value respectively more; The b model is that error amount is compensated to respectively on one on this right side, site and two sites, below, its method is: if given up a certain value in calculating, then allow the site on right side add 1/2 of this value, two sites of below add 1/4 of this value respectively, if let it pass a certain value in calculating, then allow its three sites on every side deduct corresponding value respectively more.

3, the site method for making of column mirror grating stereo according to claim 2 printing figure is characterized in that, said " four sites of this right side, site and below " are meant with the target site and are in neighbour node on the same view; " this right side, site one and two sites, below " also is meant with the target site and is in neighbour node on the same view.

4, the site method for making of column mirror grating stereo printing figure according to claim 1 is characterized in that, is realized by following steps:

(1), with 70 lines/inch grating, directly directly making a plate with the resolution of 2400 point/inches on the platemaking machine, employing formula (1) obtains:

$a\·n\≈\frac{2400}{70}$

a·n≈34

$a\≈\frac{34}{n},$

With 70 lines/inch grating, 2400 points/inch output device output, when every width of cloth view generated 1 row's laser spots (n=1), the three-dimensional view quantity of required making was 34 width of cloth; When every width of cloth view generated 2 row's laser spots (n=2), the three-dimensional view quantity of required making was 17 width of cloth, gets n=2;

(2), the site model is carried out mathematical modeling, method for building up is:

(1) determines the size of unit, site

1), differentiate the computing formula of object ability, determine the height of unit, site according to human eye,

$\frac{L}{P}\≤\frac{1}{1500}$ Formula (2),

The viewing distance of stereographic map is more than 300 millimeters, and substitution formula (2) gets the height L of unit, site smaller or equal to 300/1500, promptly 0.2 millimeter;

2), according to the resolution of output device, determine that the site cell height is that the laser of 0.2 millimeter correspondence is counted;

Send a manuscript to the compositor with 2400 points/inch output device, the laser m that counts is calculated by formula (2):

$m=\frac{0.2\×2400}{25.4}\≈20,$

(2) determine the site growth model

The unit, site is made up of m * n laser spots, m=20, and n=2, unit, a site is made up of 40 laser spots, according to the rule of site growth model, the fill order of 40 laser spots is numbered, and promptly draws site growth model 1;

Black channel, cyan passage, magenta passage, yellow channels are all pressed 40 laser spots filling modes and are generated the site, when growing in the site, the reference position difference, fill order is also different, the reference position of site growth is: black channel, cyan passage, magenta passage, yellow channels are respectively since the 5th row, the 10th row, the 15th row, the 20th row's laser spots, by from left to right, series arrangement from bottom to top, after top row is full, arrange downwards again, in the making of same width of cloth figure, the site arranged model of four Color Channels can exchange;

(3) gray level of ruleization image makes it and adds pessimistic concurrency control to be complementary, and method is:

Original copy adopts 17 width of cloth views, and image resolution ratio φ is 1200 point/inches, and output device resolution is that r is 2400 point/inches;

1), asks original copy pixel grey scale mean value

The number λ of the original copy pixel of unit, site correspondence is obtained by formula (4);

$\mathrm{\λ}=\frac{\mathrm{\φ}}{r}\×20=\frac{1200}{2400}\×20=10$ Formula (4),

From the original copy upper left side, vertically getting per 10 pixels, to carry out gray-scale value average, tries to achieve average gray value by formula (5)

, the position that should fill when this value decision generates in the site;

$\stackrel{\‾}{G}=\frac{1}{10}\underset{1}{\overset{10}{\mathrm{\Σ}}}{G}_i$ Formula (5);

2), the numerical value interval of average gray value is adjusted to determine filling position

If the bit depth of each passage of original image is 8, the number of greyscale levels of image is 2 ⁸=256, promptly 0≤

It is 20 * 2=40 that≤255, the laser that the unit, site is comprised is counted, and when filling the site by gray level, must use with 256 gray level ruleization on 40 gray levels

Gray-scale value after the expression ruleization is got by formula (6):

$\stackrel{\‾}{G}\text{\′=}\frac{\stackrel{\‾}{G}}{2^b}\·m\·n\·\mathrm{\Ψ}=\frac{\stackrel{\‾}{G}}{256}\×40,$

Calculated value between 0 to 255, when the average gray value of a cyan path 10 pixel

Be 123 o'clock, press following formula and calculate, get gray-scale value

Be 19.2, this value is looked for respective value in the site model of cyan passage correspondence, it is between the 19-20, round off, get 19, then every laser spots smaller or equal to 19 position is all filled, and does not fill greater than the laser spots of 19 position, and obtaining average gray value thus is site corresponding on 123 positions;

3), site error compensation

The average gray value that obtains by formula (5)

Round off rounds, and error compensates with the site error compensation model;

Carry out site error compensation with a model, the a model is error amount to be compensated to respectively on " four sites of this right side, site and below ", its method is: in above-mentioned result of calculation with formula (5), given up 0.2, then allow its four sites on every side add 1/4 of this value respectively, i.e. 0.2 * 1/4=0.05, said " four sites of this right side, site and below " are meant with the target site and are in neighbour node on the same view, because of the view that adopts is 17 width of cloth, so laterally in former figure just can find neighbor on the same width of cloth view every 17 pixels;

(3), write the site by above-mentioned site model and generate the 3D-RIP program;

(4), the grating stereo view file made generated in the site carries out screening in the 3D-RIP program and handle, obtain branch version two-value halftone dot image;

(5), the branch version two-value halftone dot image of above-mentioned generation is outputed on the film by laser photocomposing machine, printing down obtains galley or makes galley by computer direct platemaking machine;

(6), picture and text are printed onto on the paper, and then cold mounting on the original screen panel, promptly obtain having high definition and superpower relief grating stereo printing figure.

5, the site method for making of column mirror grating stereo printing figure according to claim 1 is characterized in that, is realized by following steps:

(1), with 75 lines/inch grating, directly directly making a plate with the resolution of 2400 point/inches on the platemaking machine, employing formula (1) obtains:

$a\·n=\frac{2400}{75}$

a·n＝34

$a=\frac{34}{n},$

With 75 lines/inch grating, 2400 points/inch output device output, when generating 4, every width of cloth view arranges laser spots, and during n=4, the three-dimensional view quantity of required making is 8 width of cloth;

(2), the site model is carried out mathematical modeling, method for building up is:

(1) determines the size of unit, site

1), differentiate the computing formula of object ability, determine the height of unit, site according to human eye,

$\frac{L}{P}\≤\frac{1}{1500}$ Formula (2),

The viewing distance of stereographic map is more than 300 millimeters, and substitution formula (2) gets the height L of unit, site smaller or equal to 300/1500, promptly 0.2 millimeter;

2), according to the resolution of output device, determine that the site cell height is that the laser of 0.2 millimeter correspondence is counted;

Send a manuscript to the compositor with 2400 points/inch output device, the laser m that counts is calculated by formula (2):

$m=\frac{0.2\×2400}{25.4}\≈20,$

(2) determine the site growth model

The unit, site is made up of m * n laser spots, m=20, and n=4, unit, a site is made up of 80 laser spots; According to the rule of site growth model, the fill order of 80 laser spots is numbered, promptly draw site growth model 2;

Black channel, cyan passage, magenta passage, yellow channels are all pressed 80 laser spots filling modes and are generated the site, but when growing in the site, the reference position difference, fill order is also different, the reference position of site growth is: black channel and cyan passage since the 3rd and the 8th row's laser spots, by from left to right, are arranged respectively from bottom to top, after top row is full, arrange downwards again; The magenta passage since the 14th and the 19th row's laser spots, by from left to right, is arranged respectively from top to bottom, after below row is full, arranges upward again, and in the making of same width of cloth figure, the site arranged model of four Color Channels can exchange;

(3) gray level of ruleization image makes it and adds pessimistic concurrency control to be complementary, and method is:

Original copy adopts 8 width of cloth views, and image resolution ratio φ is 600 point/inches, and output device resolution is that r is 2400 point/inches;

1), asks original copy pixel grey scale mean value

The number λ of the original copy pixel of unit, site correspondence is obtained by formula (4):

$\mathrm{\λ}=\frac{\mathrm{\φ}}{r}\×20=\frac{600}{2400}\×20=5$ Formula (4),

From the original copy upper left side, getting vertically per 5 pixels, to carry out gray-scale value average, tries to achieve average gray value by formula (5)

, the position that should fill when this value decision generates in the site;

$\stackrel{\‾}{G}=\frac{1}{5}\underset{1}{\overset{5}{\mathrm{\Σ}}}{G}_i$ Formula (5),

2), definite filling position is adjusted in the numerical value interval of average gray value

If the bit depth of each passage of original image is 8, the number of greyscale levels of image is 2 ⁸It is 20 * 4=80 that=256, the laser that the unit, site is comprised is counted, and when filling the site by gray level, must use with 256 gray level ruleization on 80 gray levels

Expression is got by formula (6):

$\stackrel{\‾}{G}\′=\frac{\stackrel{\‾}{G}}{2^b+1}\·m\·m\·\mathrm{\Ψ}=\frac{\stackrel{\‾}{G}}{256}\×80,$

Calculated value between 0 to 255, when the average gray value of 5 pixels of cyan passage

Be 95 o'clock, press following formula and calculate, get gray-scale value

Be 29.6, this value is looked for respective value in the site model of cyan passage correspondence, it is between the 29-30, round off, get 30, then every laser spots smaller or equal to 30 position is all filled, and does not fill greater than the laser spots of 30 position, average gray value be site corresponding on 95 positions;

3), site error compensation

The average gray value that obtains by formula (5)

Round off rounds, and error compensates with the site error compensation model;

Carry out error compensation with the b model in the error compensation model of site, the b model is that error amount is compensated to respectively on one on this right side, site and two sites, below, in formula (5) result of calculation, calculated 0.4 more, then allow the site on right side deduct 0.4 1/2, promptly 0.2, two sites of below deduct respectively 0.4 1/4, promptly 0.1 because the quantity of view is 8 width of cloth, on original image, laterally just can find with the target site to be in neighbour node on the same view every 8 row's pixels;

(3), write the site by above-mentioned site model and generate the 3D-RIP program;

(4), the grating stereo view file made generated in the site carries out screening in the 3D-RIP program and handle, obtain branch version two-value halftone dot image;

(5), the branch version two-value halftone dot image of above-mentioned generation is outputed on the film by laser photocomposing machine, printing down obtains galley or makes galley by computer direct platemaking machine;

(6), picture and text are printed onto on the paper, and then cold mounting on the original screen panel, promptly obtain having high definition and superpower relief grating stereo printing figure.

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