CN100471226C - Semi-tone type image treatment system and method - Google Patents
Semi-tone type image treatment system and method Download PDFInfo
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- CN100471226C CN100471226C CNB200510125724XA CN200510125724A CN100471226C CN 100471226 C CN100471226 C CN 100471226C CN B200510125724X A CNB200510125724X A CN B200510125724XA CN 200510125724 A CN200510125724 A CN 200510125724A CN 100471226 C CN100471226 C CN 100471226C
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Abstract
The invention includes steps: inputting image tone scale data of standard color table into a second print device; carrying out halftone process based on halftone table in the print to output a second image tone scale data; next, based on the image tone scale data and the second image tone scale data obtain a local function expression; obtaining correlation function expression; based on the correlation function expression to modify the halftone table to the modified halftone table in order to make printing effect of the second print device approaches printing effect corresponding to standard function expression further. Modifying image output from non-standard print device, the method makes image output from non-standard print device approach effect of image output from standard print device.
Description
Technical field
The present invention relates to a kind of image processing system and method, particularly relate to a kind of image processing system and method for handling the halftone of image in the printing device with halftone that be used in.
Background technology
Generally before printing devices such as printer are printd, all need to carry out the seal pre-treatment of halftone (halftoning), make printer receive image data after, the desirable picture of prining of prining out.
With picture, be to have a plurality of closely pixels (pixel) arranged side by side, each pixel respectively has corresponding shade of gray, and general shade of gray scope is from 0 to 255, constitutes whole picture according to this.
So-called halftone is with half hue table (halftone table) each pixel in the corresponding picture of image data institute to be carried out the data conversion.The halftoning table is that the directivity that had according to different printing primary colors such as C, M, Y, K is to form, because it is to be an existing known techniques, so do not repeat them here.
For example, following table one is the image colourity data of one group of desire input printing device, corresponding to picture comprise a plurality of pixels (each grid) with and corresponding shade of gray (numerical value wherein).
Table one
| 0 | 70 | 70 | 70 |
| 0 | 70 | 70 | 70 |
| 0 | 0 | 70 | 70 |
| 0 | 70 | 70 | 70 |
Table two is one group of halftoning table, the adjustment value (dithervalue) of a plurality of correspondences is also arranged: 144,128,112,96,160,16,0,80,176,32,48,64,192,208,224,255 in the halftoning table.
Table two
| 144 | 128 | 112 | 96 |
| 160 | 16 | 0 | 80 |
| 176 | 32 | 48 | 64 |
| 192 | 208 | 224 | 255 |
Above-mentioned table one is compared with corresponding position with table two and obtaining table three, when the shade of gray of picture pixel during less than the numerical value of halftoning table, is to be converted to data 0.When the shade of gray of picture pixel during, be to be converted to data 1 greater than the numerical value of halftoning table.For example compare in regular turn from the upper left corner, 0＜144 is converted to 0,70＜128 is converted to 0,70＜112 are converted to 0,70＜96 is converted to 0,0＜160 and is converted to 0,70〉16 be converted to 1,70〉0 be converted to 1,0＜80 and be converted to 0,0＜176 is converted to 0,0＜32 is converted to 0,70〉48 be converted to 1,70〉64 be converted to 1,0＜192 and be converted to 0,70＜208 and be converted to 0,70＜224 are converted to 0,70＜255 is converted to 0.
Table three
| 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 0 |
| 0 | 0 | 1 | 1 |
| 0 | 0 | 0 | 0 |
Printer then according to data such as 0,1 of change back table three, is printed and is not printed with decision, and the picture of prining that the result of follow-up printing just forms.
See also Figure 1 and Figure 2, Fig. 1 is the print curve synoptic diagram of effect of the standard printer of existing known techniques, and Fig. 2 is the schematic diagram of standard color table.Image color range data with as shown in Figure 2 standard color table (testchart) 2, import in the standard printer and (claim first printing device later on), and in this first printing device, carry out halftone by aforesaid halftoning table and handle, to export one first image colourity data.Follow-up, according to this image color range data (ordinate) and this first image colourity data (abscissa), can get a standard letter formula, corresponding to the curve F (x) that is among Fig. 1 wherein.
Yet, if choose another non-standard printer when (claiming the secondary series printing device later on), after the image color range data of input same standard color table 2, after the halftoning table that process is the same carries out the halftone processing, second image colourity data meeting of being exported and the first image colourity data of first printing device disagree, the image of being printd be not too black be exactly too white, even the image gray scale non-linear distribution that is that distributes.In Fig. 1, promptly can get a machine letter formula, corresponding to the curve G (x) that is among Fig. 1 wherein according to this image color range data (ordinate) and this second image colourity data (abscissa).Can find that in Fig. 1 G (x) and F (x) are devious.
This shows that above-mentioned existing image processing system and method obviously still have inconvenience and defective in structure, method and use, and demand urgently further being improved.In order to solve the problem that image processing system and method exist, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of image processing system and method for new halftone, just become the current industry utmost point to need improved target.
Because the defective that above-mentioned existing image processing system and method exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge thereof, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of image processing system and method for new halftone, can improve general existing image processing system and method, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing image processing system and method exist, to address the above problem, and a kind of new image processing system and method for handling image in the printing device with halftone that be used in be provided, technical problem to be solved is to make it can revise the image that off-gauge printing device is exported, make the output image of non-standard printing device can be similar to the effect of standard printing device output image, thereby be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.The image treatment method of a kind of halftone (halftoning) that proposes according to the present invention, this image treatment method comprises the following steps: to capture a standard letter formula; Image color range data with a standard color table (test chart), import a secondary series printing device, and in this secondary series printing device, carry out halftone by the halftoning table under this secondary series printing device (halftone table) and handle, to export one second image colourity data; According to this image color range data and this second image colourity data, to get a machine letter formula; Ask for the connection letter formula of this this machine letter formula and this standard letter formula; Adjust the halftoning table according to the halftoning table in this this secondary series printing device of connection letter formula correction to become one; And with the image color range data of this standard color table, import this secondary series printing device, and in this secondary series printing device, carry out halftone and handle by this adjustment halftoning table, to export one the 3rd image colourity data, wherein the pairing effect of prining of the 3rd image colourity data levels off to the pairing effect of prining of this standard letter formula.
The object of the invention to solve the technical problems also is further achieved by the following technical measures.
The image treatment method of aforesaid halftone, wherein said standard letter formula, be to form: with the image color range data of this standard color table through following step, import one first printing device, and in this first printing device, carry out halftone by the halftoning table under this first printing device and handle, to export one first image colourity data; And according to this image color range data and this first image colourity data, to get a standard letter formula.
The image treatment method of aforesaid halftone, wherein said standard letter formula be F (x) _, this this machine letter formula is G (x), this connection letter formula is to be F
-1(G (x)).
The object of the invention to solve the technical problems also realizes by the following technical solutions.The image processing system of a kind of halftone (halftoning) that proposes according to the present invention, it is the effect of prining according to a standard letter formula correction one secondary series printing device, this image processing system comprises: one second halftone module, be arranged in this secondary series printing device, be in order to will import the image color range data of the standard color table (test chart) in this secondary series printing device, carry out halftone by half hue table (halftone table) and handle, to export one second image colourity data; One letter formula produces module, according to this image color range data and this second image colourity data, to get a machine letter formula; One corresponding relation produces module, asks for the connection letter formula of this this machine letter formula and this standard letter formula; And an adjustment module, be to adjust the halftoning table to become one according to the halftoning table in this this secondary series printing device of connection letter formula correction; Wherein, follow-up image color range data with this standard color table, import this secondary series printing device, and in this secondary series printing device, carry out halftone and handle by this adjustment halftoning table, exporting one the 3rd image colourity data, the pairing effect of prining of the 3rd image colourity data levels off to the pairing effect of prining of this standard letter formula.
The object of the invention to solve the technical problems can also be further achieved by the following technical measures.
The image processing system of aforesaid halftone, wherein this image processing system more comprises: one first halftone module, be arranged in one first printing device, be in order to will import the image color range data of the standard color table (test chart) in this first printing device, carry out halftone by the halftoning table under this first printing device (halftone table) and handle, to export one first image colourity data; Wherein, this letter formula produces module system according to this image color range data and this first image colourity data, to get a standard letter formula.
The image processing system of aforesaid halftone, wherein said standard letter formula is F (x), and this this machine letter formula is G (x), and this connection letter formula is to be F
-1(G (x)).
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to achieve the above object, the invention provides the image processing system of a kind of halftone (halftoning), is the effect of prining according to a standard letter formula correction one secondary series printing device.Image processing system comprises that one second halftone module, a letter formula produce module, a corresponding relation produces a module and an adjustment module.
This second halftone module, be arranged in the secondary series printing device, be in order to will import the image color range data of the standard color table in this secondary series printing device, and to carry out halftone by the halftoning table under the secondary series printing device and handle, to export one second image colourity data.
This letter formula produces module, is according to this image color range data and this second image colourity data, to get a machine letter formula.
This corresponding relation produces module, is the connection letter formula of asking for this this machine letter formula and this standard letter formula.
This adjustment module, be to be one to adjust the halftoning table according to this this halftoning telogenesis of connection letter formula correction, follow-up, image color range data with this standard color table, import this secondary series printing device, and in this secondary series printing device, carry out halftone by this adjustment halftoning table and handle, to export one the 3rd image colourity data.
By said structure, make the pairing effect of prining of the 3rd image colourity data level off to the pairing effect of prining of this standard letter formula.
In order to achieve the above object, the present invention also provides a kind of image treatment method of halftone, and it mainly is the image color range data with the standard color table, imports in the secondary series printing device, and carry out halftone according to wherein halftoning table and handle, to export one second image colourity data.Follow-uply get a machine letter formula according to this image color range data and this second image colourity data, and the connection letter formula of this machine of asking for letter formula and standard letter formula.Be adjustment halftoning table according to this halftoning telogenesis of connection letter formula correction again, make the more pairing effect of prining of convergence standard letter formula of effect of prining of follow-up secondary series printing device.
By technique scheme, the image processing system of a kind of halftone of the present invention and method have following advantage at least: be used in the printing device by the present invention, handle the image processing system and the method for image with halftone, utilize corresponding relation to produce module and ask for connection letter formula, utilizing the adjustment module again is to adjust the halftoning table according to connection letter formula correction halftoning telogenesis, revises this machine letter formula with convergence standard letter formula more.Can revise the image that off-gauge printing device is exported by this, make the output image of non-standard printing device can be similar to the effect of standard printing device output image.
In sum, the invention provides a kind of image processing system and method for handling image in the printing device with halftone that be used in, it can revise the image that off-gauge printing device is exported, make the output image of non-standard printing device can be similar to the effect of standard printing device output image, thereby be suitable for practicality more.It has above-mentioned plurality of advantages and practical value, no matter bigger improvement is all arranged on product structure, method or function, has than much progress technically, and has produced handy and practical effect, thereby be suitable for practicality more, and have the extensive value of industry.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the print curve synoptic diagram of effect of the standard printer of existing known techniques.
Fig. 2 is the schematic diagram of standard color table.
Fig. 3 is the schematic diagram of the image processing system of halftone of the present invention.
Fig. 4 is the flow chart of the image treatment method of halftone of the present invention.
30: 34: the first halftone modules of image processing system
36: the second halftone modules 37: the letter formula produces module
38: corresponding relation produces module 39: the adjustment module
Printing device 46 in 44: the first: the secondary series printing device
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, image processing system and its embodiment of method, structure, method, step, feature and the effect thereof of a kind of halftone that foundation the present invention is proposed, describe in detail as after.
Can be about the advantages and spirit of the present invention by following detailed Description Of The Invention and appended graphic being further understood.
Seeing also shown in Figure 3ly, is the schematic diagram of the image processing system of halftone of the present invention.The image processing system 30 of a kind of halftone (halftoning) of preferred embodiment of the present invention, comprise that one first halftone module 34, one second halftone module 36, a letter formula produce module 37, one corresponding relation and produce a module 38 and an adjustment module 39, wherein:
This first halftone module 34, be arranged in one first printing device 44, be in order to will import the image color range data of the standard color table (test chart) 2 in first printing device 44, carry out halftone by the halftoning table (halftone table) under first printing device 44 and handle, to export one first image colourity data.
This second halftone module 36, be arranged in the secondary series printing device 46, be in order to will import the image color range data of the standard color table (test chart) 2 in the secondary series printing device 46, carry out halftone by the halftoning table (halftone table) under the secondary series printing device 46 and handle, to export one second image colourity data.
This letter formula produces module 37, is according to this image color range data and this first image colourity data, to get a standard letter formula F (x).The letter formula produces module 37 and according to this image color range data and this second image colourity data, with a machine letter formula G (x).
This corresponding relation produces module 38, is the connection letter formula of asking for this this machine letter formula and this standard letter formula.
This adjustment module 39, be to be one to adjust the halftoning table according to the halftoning telogenesis under this connection letter formula correction secondary series printing device 46, follow-up, again with the image color range data of this standard color table, input secondary series printing device 46, and in secondary series printing device 46, carry out halftone by this adjustment halftoning table and handle, to export one the 3rd image colourity data.The pairing effect of prining of the 3rd image colourity data levels off to the pairing effect of prining of this standard letter formula, and make the output image of non-standard printing device advance like or equal the effect of standard printing device output image.
What need supplementary notes is that standard letter formula F (x) can preset, and then is that directly acquisition gets final product.The foregoing description is to utilize first printing device 44 to obtain standard letter formula F (x), is the explanation for a kind of embodiment.
Further, now further specify as follows about the generation of correlating the letter formula.Suppose this machine letter formula G (x), standard letter formula F (x), numerous effects of I/O can be obtained representational letter formula through regression analysis on this machine letter formula G (x) and standard letter formula F (x) practice.Follow-up, then this machine letter formula G (x) is F-1 (G (x)) with the connection letter formula f (x) of standard letter formula F (x).
If f (x) is (x/255) 1/2*255, utilize the example of each the adjustment value (dither value) in the halftoning table that correlates the former table two of letter formula correction as follows.Connection letter formula described as follows:
f(0)＝0
f(16)＝64
f(32)＝90
f(48)＝107
f(64)＝128
f(80)＝143
f(96)＝156
f(112)＝169
f(128)＝181
f(144)＝192
f(160)＝202
f(176)＝212
f(192)＝221
f(208)＝230
f(224)＝239
f(255)＝255
So, the former table two adjustment halftoning table that just becomes table ten one is as follows:
Table ten one
| 192 | 181 | 169 | 156 |
| 202 | 64 | 0 | 143 |
| 212 | 90 | 107 | 128 |
| 221 | 230 | 239 | 255 |
With the adjustment halftoning table comparison of table one with table ten one, the resulting new effect of prining is following table ten three, and is please as follows referring to table ten three:
Table ten three
| 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 0 |
| 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 01 |
Former table one is described image color range data, and former table three is the second image colourity data, can obtain this machine letter formula G (x) according to table one and table three.And new table ten one is for adjusting the halftoning table, and table ten three is the 3rd image colourity data, and the pairing effect of prining of the 3rd image colourity data levels off to the pairing effect of prining of this standard letter formula.Just according to the new letter formula of table one and table ten three gained, be more to level off to standard letter formula F (x) than this machine letter formula G (x), and the better image quality of can prining out.
The present invention also is the image treatment method that aforementioned image processing system 30 is implemented.Seeing also shown in Figure 4ly, is the flow chart of the image treatment method of halftone of the present invention.The image treatment method of halftone of the present invention comprises the following steps:
Step S02: with the image color range data of a standard color table (test chart) 2, import one first printing device 44, and in first printing device 44, carry out halftone by the halftoning table (halftone table) under first printing device 44 and handle, to export one first image colourity data.
Step S04: according to this image color range data and this first image colourity data, to get a standard letter formula.
Step S06: with the image color range data of standard color table 2, import a secondary series printing device 46, and in secondary series printing device 46, carry out halftone and handle, to export the second image colourity data by the halftoning table under the secondary series printing device 46.
Step S08: according to image color range data and this second image colourity data, to get a machine letter formula.
Step S10: the connection letter formula of asking for this this machine letter formula and this standard letter formula.
Step S12: according to the halftoning telogenesis under this connection letter formula correction secondary series printing device 46 is an adjustment halftoning table.
Step S14: follow-up image color range data with this standard color table, input secondary series printing device 46, and in secondary series printing device 46, carry out halftone by this adjustment halftoning table and handle, to export one the 3rd image colourity data.Then the pairing effect of prining of the 3rd image colourity data levels off to the pairing effect of prining of this standard letter formula, that is the 3rd image colourity data and image color range data produce new letter formula, than this this machine letter formula this standard letter formula of convergence more, even equal this standard letter formula.
Therefore, be used in the printing device by the present invention, handle the image processing system 30 and the method for image with halftone, utilize corresponding relation to produce module 38 and ask for connection letter formula, utilizing adjustment module 39 again is to adjust the halftoning table according to connection letter formula correction halftoning telogenesis, revises this machine letter formula with convergence standard letter formula more.Can revise the image that off-gauge printing device is exported by this, make the output image of non-standard printing device can be similar to the effect of standard printing device output image.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, by the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed specific embodiment.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (6)
1, the image treatment method of a kind of halftone (halftoning) is characterized in that this image treatment method comprises the following steps:
Capture a standard letter formula;
Image color range data with a standard color table (test chart), import a secondary series printing device, and in this secondary series printing device, carry out halftone by the halftoning table (halftonetable) under this secondary series printing device and handle, to export one second image colourity data;
According to this image color range data and this second image colourity data, to get a machine letter formula;
Ask for the connection letter formula of this this machine letter formula and this standard letter formula;
Adjust the halftoning table according to the halftoning table in this this secondary series printing device of connection letter formula correction to become one; And
Image color range data with this standard color table, import this secondary series printing device, and in this secondary series printing device, carry out halftone and handle by this adjustment halftoning table, to export one the 3rd image colourity data, wherein the pairing effect of prining of the 3rd image colourity data levels off to the pairing effect of prining of this standard letter formula.
2, the image treatment method of halftone according to claim 1 is characterized in that wherein said standard letter formula, is to form through following step:
With the image color range data of this standard color table, import one first printing device, and in this first printing device, carry out halftone and handle, to export one first image colourity data by the halftoning table under this first printing device; And
According to this image color range data and this first image colourity data, to get a standard letter formula.
3, the image treatment method of halftone according to claim 1 is characterized in that wherein said standard letter formula is F (x), and this this machine letter formula is G (x), and this connection letter formula is to be F
-1(G (x)).
4, the image processing system of a kind of halftone (halftoning) is according to the effect of prining of a standard letter formula correction one secondary series printing device, it is characterized in that this image processing system comprises:
One second halftone module, be arranged in this secondary series printing device, be in order to will import the image color range data of the standard color table (test chart) in this secondary series printing device, carry out halftone by half hue table (halftone table) and handle, to export one second image colourity data;
One letter formula produces module, according to this image color range data and this second image colourity data, to get a machine letter formula;
One corresponding relation produces module, asks for the connection letter formula of this this machine letter formula and this standard letter formula; And
One adjustment module is to adjust the halftoning table according to the halftoning table in this this secondary series printing device of connection letter formula correction to become one;
Wherein, follow-up image color range data with this standard color table, import this secondary series printing device, and in this secondary series printing device, carry out halftone and handle by this adjustment halftoning table, exporting one the 3rd image colourity data, the pairing effect of prining of the 3rd image colourity data levels off to the pairing effect of prining of this standard letter formula.
5, the image processing system of halftone according to claim 4 is characterized in that this image processing system more comprises:
One first halftone module, be arranged in one first printing device, be in order to will import the image color range data of the standard color table (test chart) in this first printing device, carry out halftone by the halftoning table under this first printing device (halftone table) and handle, to export one first image colourity data;
Wherein, this letter formula produces module system according to this image color range data and this first image colourity data, to get a standard letter formula.
6, the image processing system of halftone according to claim 4 is characterized in that wherein said standard letter formula is F (x), and this this machine letter formula is G (x), and this connection letter formula is to be F
-1(G (x)).
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