CN1310760C - Method of printing data by using different ink droplet size - Google Patents
Method of printing data by using different ink droplet size Download PDFInfo
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- CN1310760C CN1310760C CNB2003101214866A CN200310121486A CN1310760C CN 1310760 C CN1310760 C CN 1310760C CN B2003101214866 A CNB2003101214866 A CN B2003101214866A CN 200310121486 A CN200310121486 A CN 200310121486A CN 1310760 C CN1310760 C CN 1310760C
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Abstract
The present invention relates to a method for generating printing data by using different sizes of ink droplets. The present invention is suitable for a printing device which outputs the ink droplets with different sizes through a plurality of ink guns. First, all of combination modes are calculated according to the number of the ink guns and the number of the ink droplets which can be output by each ink gun, and a halftoning threshold-table is built according to the color saturation displayed by various combination modes; when image data to be printed in input, each pixel of the image data is corresponding to one proper combination mode in the halftoning threshold-table according to the halftoning threshold-table, and the combination mode is a halftoning encoding value, wherein the halftoning encoding value can be divided into bits of a plurality of groups, and each group is directly corresponding to the number of the ink droplets in charge of one single ink gun, so in the mode of directly driving each ink gun for printing, the treatment process of the printing data is simplified, and the printing efficiency is improved.
Description
Technical field
The present invention relates to printer, refer to a kind of printed information production method that prints with different ink drop size that is applicable to especially.
Background technology
Inkjet printing (Drop-on-Demand Ink Jet Printing) is to utilize ink gun to move back and forth on paper, and the spray orifice that drives ink gun in the position of desiring to spray ink droplet is sprayed onto this place and finishes print job.Inkjet printing now must make print result have abundant color range and change in order to present photograph quality (Photographicquality); That is, some printing colors (for example C, M, Y), arbitrary location of pixels on paper (Pixel location), must be able to produce from shallow to deep different levels and change (for example by not spraying, shallowly telling 8 kinds of variations) to the darkest, thus, by the combination of C, M, these main colors of Y (Primary color), just can go out abundant colors and color range variation by structure, and reach the requirement of photograph quality.
This level that produces from shallow to deep changes, and can print (Multi-dropprinting) by many ink droplets and reach, and promptly sprays plural number in same position and drips ink droplet, to reach the effect of printing (Multi-level printing) on the color at many levels.But reach because many ink droplets are printed the skill that needs by multiple-pass (Multi-pass) is printed, therefore when printing, ink gun must carry out the reciprocating motion of repetition, and the required number that drips is sprayed in accumulation on all location of pixels in regular turn.Its whole print speed (Throughput) just is restricted thus, has caused the printing of photograph quality to need result for a long time consuming time usually.
In order to reach so-called photograph quality (photo image quality), make the result who prints have more continuous tone, most important key is to make the amount of color on each location of pixels reach at most, and its necessary condition be the ink droplet of ink-jet must be littler.Early stage ink-jet ink-droplet size is bigger, 80 to 100pl. (picoliter are arranged approximately, the part per trillion litre), if to print resolution is that 300dpi is an example, single ink droplet promptly takes the size of a pixel approximately, therefore the change color that can produce is just fewer, the photo analysis degree enhancing technology (PhotoREt that is proposed by Hewlett-Packard (Hewlett Packard), photo resolution enhancement technology) promptly provide a kind of scheme of solution, along with the development of manufacturing technology, color ink gun (three looks of releasing at present, CMY), its output ink droplet is only had about 10pl, and on any location of pixels, a color can be sprayed onto 8 ink droplets at most.For this kind ink gun, if on a location of pixels with 0,1,3 or 8 ink droplets of solid color, then can obtain by white and deeper and deeper 4 kinds of different color ranges.If add the result of colour mixture, just can directly produce above 250 kinds of printable colors, significantly improve the degree of enriching of the number and the color of color range.
And as for the printing principle of ink-jet printer such as following: when desire is printed an image, earlier the image data (Image data) of input is done the processing of a halftoning (Halftoning process), the image data that also is about to input changes the information that ink-jet ink-droplet is got ready into.For instance, when early stage ink drop size is big, the selection of single melted ink of spray or not ink-jet water is only arranged for single location of pixels, therefore, if its color range of image data of input is to be expressed as 0 to 255 successive value with 8bit, then the median (promptly 127) of color range is got by its halftoning method system, as halftoning critical value (Halftoningthreshold), the pixel that surpasses this value is sprayed a melted ink, and the pixel that is less than or equal to this value is not just got ready.Through the process of this halftoning, the pixel that original 8bit represents just can represent that this is the most basic halftone process mode by 1bit (0/1, do not spray/spray).
Along with the development of photograph quality printing technique noted earlier, need spray zero on each location of pixels to several ink droplets, to increase the variation of color range.For the printing of ink droplet (Multi-drop) more than this kind, each location of pixels not only need provide spray and the information of not spraying, and also must consider the depth information of color.If adopt many ink droplets printing type of same drop size, shade is to realize by the number of ink droplet.Conspicuous, when printing when must consider more condition (whether print, shade), the above-mentioned halftoning method of representing with 1bit promptly can't satisfy.
If represent by four kinds of reference position values (level) of 0 to 3 with 2bit, these four reference position values just can be used for representing the shade that should spray on this location of pixels.Halftoning method corresponding to this then can be divided into four sections with the continuous color range of aforementioned 0-255, that is its halftoning critical value is 63,127,191.And occupy respectively 0,63}, 64,127}, 128,191}, 192, the input image data of 255} can correspond to four reference position values of 0-3, and just with 2bits represent 00,01,10,11.This halftone process of representing above 1bit is called multidigit unit or multi-level halftoning (Multi-level or Multi-bit halftoning process) program again.
Processing through halftoning after the reference position value (level) of each location of pixels correspondence has been arranged, further promptly determines the requirement that this shows each reference position value (level) with what ink droplet number.With above-mentioned 4 reference position values is example, meeting the required ink droplet number of each reference position value can be found out by following step: at first determine the highest the allowing of ink of each color on the single pixel to drip number, surpassing this number may be that shade (density) can't further be distinguished, or surpassed the permissible range of paper, beginning to take place ink droplet scope (dot area) and exceed this location of pixels, is that example is to be the upper limit with 8 with aforementioned color ink gun.Then, the number (herein being 0 to 8) that drips that may be used for printing is sprayed onto on the paper, and measures its color saturation (density) respectively.Because of target is to be divided into 4 color ranges (level), therefore count with 0%, 33%, 66%, 100% corresponding required dripping of saturation degree, obtain { 0,1,3, the result that 8} drips, as shown in Figure 4, the longitudinal axis (y axle) representative color saturation degree, and transverse axis (x axle) expression ink droplet number, the dripping numerical value and will be used to the requirement of when printing, reaching each level color range of these correspondences.In other words, foregoingly occupy respectively that { 0,63}, { 64,127}, { 128,191}, { 192, the input image data of 255} will be respectively so that { 0,1,3, the number that drips of 8} is reached.
Aforementioned techniques is that the equal equivalent of ink drop size that is provided with ink gun is the example explanation, if printer can provide the ink droplet of different sizes, then can finish print job with less total drop number by the appropriate combination of big or small ink droplet.For example, check and approve patent announcement the 5th in the U.S., 917, in No. 510 a cases, system utilizes the Drop-on-Demand ink gun of piezoelectricity (Piezo) principle, pixel according to halftoning result's different level, the different ink droplet of control ink gun ejection correspondingly-sized, to reach the purpose of printing different level ink dots, the halftoning method of this patent is general error-diffusion method (Error diffusion), and this piece patent need have the ink gun of control ink drop size ability, demand in its cost and the control is higher, and also restricted in the selection of ink gun.Moreover, when the level of halftone process gained value desire control ink gun is exported an amount of ink droplet number, it must be through an analyzing step, the level value separated to read be must be exported by those ink guns, interpretation goes out to export how many ink droplets again, and the two stage analysis mode of this kind makes the data processing speed promptly can't promote.
Summary of the invention
Because the shortcoming that its speed of many ink droplets printing type can't promote in the prior art, main purpose of the present invention provides a kind of printed information production method that prints with different ink drop size, be applicable to that tool plural number ink gun is to export the printing equipment of different ink drop size, suitable data formats can be changed and be encoded to the color range value of image data, can control each ink gun individually with this enciphered data, promote printing effect by this.
The printed information production method that prints with different ink drop size that is applicable to provided by the invention comprises the following steps:
Set up a halftoning threshold values table, according to P kind ink drop size and all compound modes of N kind ink droplet number can be provided, obtain the color saturation that each compound mode can present, set up a halftoning threshold values table with corresponding full degree relation according to compound mode; Wherein, aforementioned P and N system is not equal to zero positive integer;
Produce one multistage layer of halftoning enciphered data with aforementioned threshold values table, be used for driving the ink droplet number that ink gun is exported corresponding ink drop size, to print image data.
Combinations thereof mode cording has (N+1)
PKind.
According to said method of the present invention, the halftoning enciphered data of being exported is to utilize the coding of combination P kind ink drop size and N kind ink droplet number and obtain.
According to said method of the present invention, described P kind ink drop size is to export by P ink gun.
According to said method of the present invention, described P kind ink drop size is to export by single ink gun.
According to said method of the present invention, described halftoning enciphered data is disassembled for P group, and each group represents N kind ink droplet number with X bit data, wherein 2
X=N.
According to said method of the present invention, described halftoning enciphered data is disassembled for P group, and each group's correspondence exports each ink gun to, and wherein each group represents the ink droplet number of the required ejection of this ink gun with X bit data, wherein 2
X=N.
Method by this, the image data of input can be printed by the ink droplet with the different volumes amount efficiently by the program of halftone process, reaches high color range quality to present, and significantly promotes print speed.
Description of drawings
Fig. 1 is the curve map of combined drop of the present invention and color saturation.
Fig. 2 is another curve map of combined drop of the present invention and color saturation.
Fig. 3 is the action calcspar that data of the present invention is printed production method.
Fig. 4 is the curve map of combined drop and color saturation in the prior art.
The specific embodiment
The present invention proposes a kind of production method of printed information, mainly be applicable to and produce the printing equipment that different ink drop size print, this printing equipment can be an ink droplet of exporting several different sizes by single ink gun, or formed by the ink gun of the different ink drop size of a plurality of correspondences, only in the following detailed description, the present invention is that the combined type printing equipment with tool plural number ink gun is an example.When an image data to be printed is desired to export printer to, because of each pixel of this image data is former is with continuous color range value representation, so must be converted to the decipherable data formats of printer, print action to drive ink gun, the present invention comprises two big major technique means, one is the foundation of halftoning threshold values table (Halftoningthreshold table), and another then is directly to export each ink gun to after according to this threshold values table the color range value being converted to a halftoning enciphered data.Below be explanation in detail:
(1) foundation of halftoning threshold values table
The combined type ink-jet printer is one to have the ink-jet printer of a plurality of ink guns, suppose that this printer has P same color and the different ink gun number (having P kind ink drop size so also can be considered) of ink drop size can be provided, and printing stroke is at most N time, be that Npass prints (each ink gun at most only can be stamped N and drip in same location of pixels), then maximum issuable ink-jet combinations just have (N+1) on single pixel
PMore than kind, aforementioned P and N two parameters be greater than zero and on the occasion of integer.For instance, if printer has P=2 ink gun, provide two kinds of different ink drop size respectively but the ink droplet of same color, and print with N=2pass at most, printing combination possible on the then single location of pixels just has (2+1)
2=9 kinds, it is combined as:
Drop#of P1/P2＝{0/0，0/1，0/2，1/0，1/1，1/2，2/0，2/1，2/2}。
Suppose that two ink gun P1 and the printable ink drop size of P2 are respectively 10pl. (pico-liter) and 30pl., then above 9 kinds of combinations can composed as followsly be shown.
| The ink droplet number of the first ink gun P1 (10pl.) | The ink droplet number of the first ink gun P2 (30pl.) | Ink droplet sum (pl.) | Saturation degree (density, %) | Color range value (0～255) |
| 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 30 | 37.5 | 96 |
| 0 | 2 | 60 | 75 | 192 |
| 1 | 0 | 10 | 12.5 | 32 |
| 1 | 1 | 40 | 50 | 128 |
| 1 | 2 | 70 | 87.5 | 224 |
| 2 | 0 | 20 | 25 | 64 |
| 2 | 1 | 50 | 62.5 | 160 |
| 2 | 2 | 80 | 100 | 255 |
As seen from the above table, aforementioned nine kinds of saturation combinations in various degree altogether, and only need 2 times printing stroke (2pass) just can be combined into 9 kinds of different ink droplet total amounts.After these combined drop modes were directed onto on the paper, the ink dot color saturation (density) that is produced by measuring its saturation degree, can be found out the relation curve of saturation degree and these nine kinds of compound modes also with different.
As shown in Figure 1, be illustrated in (N+1)
PPlant under the compound mode (shown in the X-axis), can present the relation curve of different colours saturation degree (shown in the Y-axis), the ink gun of wherein high saturation is the dark colour that this combined type ink gun printer can show with dripping that array closes, and minimum saturation degree is promptly represented in the combination of not spraying any ink dot.If it is 100% that saturation degree that will be the highest is worked out, it is 0% that minimum is then worked out, and is example with the input image data of 8bit (color range value 0-255), and then color range value 255 just corresponds to 100%density, and color range value 0 corresponds to 0%.According to the pairing saturation degree of each compound mode (density) value on Fig. 1, correspond to 0 to 255 interval according to ratio (on Y-axis, having marked out the position of these ratios), just can obtain the critical value of the accurate position of each halftoning.Via the resulting result's of this process combination, promptly be used to be used as the content of halftoning threshold values table (Halftoning threshold table), be provided as the foundation of halftoning conversion.
By can finding among Fig. 1, in numerous ink guns and the compound mode of dripping number, wherein having several, to be combined in the ink dot saturation degrees that produce when printing very close or identical, for example combination among the figure 5 and combination 6.In other words, this combined type ink gun printer can utilize the ink droplet and the combination of dripping number of several different sizes, produces close saturation degree.Therefore, when setting up halftoning threshold values table (Halftoningthreshold table),, just need not the saturation degree that these are close be considered as different accurate positions, only need get a typical value if wherein some saturation difference of being caused of combination is less than certain preset value.
(2) halftoning coding
According to aforesaid halftoning threshold values table, the continuous color range of image data of input can be done the halftoning classification of multistage layer (multi-level), and stratum's value of classification back gained can be represented result after the halftoning that is coding result by a series of bit data.
For combined type ink gun printer, printing action is to be finished by the mode that the ink gun with different ink drop size cooperates multiple-pass (multi-pass), many ink droplets to print (multi-drop), therefore the coding digital date after the halftoning promptly exports the action that each ink-jet head driving module is finished ink-jet to.Multistage layer (multi-level) halftone process of the prior art, be that the stratum's number that can tell is represented with several bit, in other words, it promptly is the process of a coding, for example, if via being divided into 8 stratum behind the halftoning threshold values table, then the halftoning result just can represent to be respectively 000,001,010,011,100,101,110,111 to distinguish each stratum by level 0 to level 7 by 3 bits.
And according to noted earlier, halftoning method proposed by the invention, its a series of numerical digit output data is that the ink gun of transferring to the different ink drop size of a plurality of tools is printed, and this digital date, promptly be to be used to refer to the required ink droplet number of spraying of each ink gun, if with producible stratum number altogether directly as the coding of digital date, then printer side is after receiving this string digital date, also need be by the process of identification parsing, be by those ink guns and must spray how many ink droplets and reach by the corresponding printing that goes out on each location of pixels of stratum value, will cause printing effect to descend thus.
For the output data of avoiding halftoning when exporting the driving module of back segment to, driving module must further correspondingly find out the efficient that suitable ink gun, ink droplet number caused and reduce, the present invention proposes a kind of coding method, can more directly drive the ink droplet number of ink gun output institute palpus, to improve the data treatment effeciency, simplified control system below is its detailed description.
What at first must emphasize a bit is that this coding method is not to carry out the numerical digit coding in regular turn according to the saturation degree exponent number value (density level) of halftone process, particularly, suppose total 7 eight kinds of exponent numbers of level0-level, then its coding output is not that 000-111 with correspondence is represented.
Opposite, coded system of the present invention will include ink gun information and printed dot number information simultaneously.At first at each ink gun, utilize its ink droplet number that can provide to encode in regular turn, certainly, this ink droplet that can provide is counted maximum can not surpass stroke (pass) number N of printing.
With regard to each ink gun, must use enough this ink gun of expression provide the bit number that might the ink droplet array closes represented, for instance, if N=3, and this ink gun can provide 0,1,2,3 ink droplet to a location of pixels in the printing of 3pass, the desire ink droplet number of this ink gun of encoding then must represent that these 4 kinds drip arrays and close with the data of 2bit at least.
Then, the multi-bit coding result with all ink guns is combined into a last halftoning output valve again, and this value is delivered to printer side as the data of printing.
Therefore, print the combined type ink gun printer of 3pass (P=2, N=3), and each ink gun all provides 0,1,2,3 ink droplet number, then altogether must be with a if having 2 ink guns
1a
2a
3a
4This 4bit is used as the output that this system represents the halftoning result, wherein a
1a
2The ink droplet number of representing first ink gun to export, and a
3a
4Promptly represent the ink droplet number that second ink gun must be exported.
Seeing also shown in Figure 2ly, below is to utilize a complete embodiment that the present invention is explained in detail.
Suppose that a combined type ink gun printer has 2 ink guns, print 3pass, each ink gun can spray 0,1,2,3 ink droplet in this 3pass, amounts to go out (3+1) capable of being combined
2=16 kinds of ink droplet concentration.Count level (level 0-level 3) because of each ink gun has 4 kinds of ink droplets, each level encodes with 2bit.So 2 ink guns the expression of the total 2bit+2bit=4bit of printed dots combination that might provide.
Among Fig. 2, the coding that the coded digital on the X-axis is this 2 ink gun of combination forms.Binary bit (binary) data for example: 0110 (6), promptly represent the ink droplet number (1) of first ink gun ejection level 1 (binary:01); Second ink gun then sprays the ink droplet number (2) of level 2 (binary:10).
After these 16 kinds printing compound modes are all printed, measure the ink dot saturation degree that various combination produces, can obtain as the curve among Fig. 2.By learning on the figure, in density 0% to 100%, can distinguish 12 intervals altogether, utilize material point on the figure as the node in interval respectively.
These represent the node of different colours degree of saturation, will be according to pro rates, and the image data (color range value continuously) of input is done the interval action (for example 0 to 255) of halftoning.
After finishing halftone process, the data of its coding output is still according to the coding of the X-axis among original Fig. 2, but not by the low paramount coding in proper order of density.
See also shown in Figure 3, via above way, after an input image data is made halftone process via halftoning threshold values table of the present invention (Halftoning threshold table), coding output via ink gun and ink droplet number, the enciphered data of being exported can be disassembled into array according to the ink gun number, deliver to each corresponding ink gun printed information respectively and handle module, and then deliver to the ink-jet driving module of each ink gun, to finish the action of printed information.
In sum, method proposed by the invention, be earlier at each ink gun and ink droplet number encoder thereof, after the saturation degree of waiting to obtain printing (density), constitute a halftoning threshold values table (Halftoning threshold table) by each material point, and in the halftoning cataloged procedure, quilt is divided the input pixel information point to a certain interval, the i.e. data that is used as exporting with its pairing encoded radio.Thus, the data of this output just can directly resolve into the bits of several groups, and each group is directly corresponding to an ink gun (original coding is exactly the combination of each ink gun individual encoded).So the multi-bit of halftoning output, can directly be sent to each ink-jet head driving module, make each ink gun according to its halftoning numerical value that receives, printing type via multiple-pass (multi-pass), mutli-drop, spray corresponding ink droplet number, thus, can simplify the process that printed information is handled, and each ink gun of efficient driving.
Claims (7)
1, a kind of printed information production method that prints with different ink drop size that is applicable to comprises the following steps:
Set up a halftoning threshold values table, according to P kind ink drop size and all compound modes of N kind ink droplet number can be provided, obtain the color saturation that each compound mode can present, set up a halftoning threshold values table with corresponding saturation degree relation according to compound mode; Wherein, aforementioned P and N are not equal to zero positive integer;
Produce one multistage layer of halftoning enciphered data with aforementioned threshold values table, be used for driving the ink droplet number that ink gun is exported corresponding ink drop size, to print image data.
2, the printed information production method that prints with different ink drop size that is applicable to as claimed in claim 1, it is characterized in that: its compound mode cording has (N+1)
PKind.
3, the printed information production method that prints with different ink drop size that is applicable to as claimed in claim 1 is characterized in that: the halftoning enciphered data of being exported is to utilize the coding of combination P kind ink drop size and N kind ink droplet number and obtain.
4, the printed information production method that prints with different ink drop size that is applicable to as claimed in claim 1 is characterized in that: described P kind ink drop size is to export by P ink gun.
5, the printed information production method that prints with different ink drop size that is applicable to as claimed in claim 1 is characterized in that: described P kind ink drop size is to export by single ink gun.
6, the printed information production method that prints with different ink drop size that is applicable to as claimed in claim 1 is characterized in that: described halftoning enciphered data is disassembled for P group, and each group represents N kind ink droplet number with X bit data, wherein 2
X=N.
7, the printed information production method that prints with different ink drop size that is applicable to as claimed in claim 4, it is characterized in that: described halftoning enciphered data is disassembled P the group that be, each group's correspondence exports each ink gun to, wherein each group represents the ink droplet number of the required ejection of this ink gun with X bit data, wherein 2
X=N.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5497180A (en) * | 1992-06-04 | 1996-03-05 | Kabushiki Kaisha Toshiba | Image recording apparatus for representing a halftone by use of a plurality of recorded dots |
| US6042211A (en) * | 1997-11-25 | 2000-03-28 | Hewlett-Packard Company | Ink drop volume variance compensation for inkjet printing |
| US6081344A (en) * | 1997-10-30 | 2000-06-27 | Hewlett-Packard Company | Device state error diffusion technique for halftoning |
| US6354689B1 (en) * | 1998-12-22 | 2002-03-12 | Eastman Kodak Company | Method of compensating for malperforming nozzles in a multitone inkjet printer |
| US6629746B2 (en) * | 2000-11-10 | 2003-10-07 | Gretag Imaging Trading Ag | Reduction of artefacts in reproduced images |
| US6637851B2 (en) * | 2001-03-09 | 2003-10-28 | Agfa-Gevaert | Color halftoning for printing with multiple inks |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5497180A (en) * | 1992-06-04 | 1996-03-05 | Kabushiki Kaisha Toshiba | Image recording apparatus for representing a halftone by use of a plurality of recorded dots |
| US6081344A (en) * | 1997-10-30 | 2000-06-27 | Hewlett-Packard Company | Device state error diffusion technique for halftoning |
| US6042211A (en) * | 1997-11-25 | 2000-03-28 | Hewlett-Packard Company | Ink drop volume variance compensation for inkjet printing |
| US6354689B1 (en) * | 1998-12-22 | 2002-03-12 | Eastman Kodak Company | Method of compensating for malperforming nozzles in a multitone inkjet printer |
| US6629746B2 (en) * | 2000-11-10 | 2003-10-07 | Gretag Imaging Trading Ag | Reduction of artefacts in reproduced images |
| US6637851B2 (en) * | 2001-03-09 | 2003-10-28 | Agfa-Gevaert | Color halftoning for printing with multiple inks |
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