CN104580819A - Spectral-analysis-based color restoration method and system - Google Patents
Spectral-analysis-based color restoration method and system Download PDFInfo
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- CN104580819A CN104580819A CN201410727139.6A CN201410727139A CN104580819A CN 104580819 A CN104580819 A CN 104580819A CN 201410727139 A CN201410727139 A CN 201410727139A CN 104580819 A CN104580819 A CN 104580819A
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- spectral information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/50—Picture reproducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The invention discloses a spectral-analysis-based color restoration method and system. The color restoration method comprises the following steps: scanning a blank area and an area printed with printing ink in a manuscript to obtain first spectral information and second spectral information respectively by virtue of a spectral analyzer, performing subtraction on the second spectral information and the first spectral information to obtain third spectral information, selecting a printing stock with spectral information the same as or similar to the first spectral information and printing ink with spectral information the same as or similar to the third spectral information from a pre-established spectral information database, and combining the printing stock with the printing ink to restore the color of the manuscript. Different from a color-analysis-based color restoration method in the prior art, the spectral-analysis-based color restoration method has the advantage that the hue, brightness and saturation of the color are ensured to be consistent with those of the manuscript when being observed under any light source.
Description
Technical field
The present invention relates to color reduction technique field, particularly relate to a kind of color method of reducing based on spectrum analysis and system.
Background technology
The industry of printing to be one with copying image be core.In copying image process, need to reduce as much as possible the color of original copy.
At present, the color of reduction original copy is substantially in the following way:
First measure the value of chromatism ▽ E of original copy through color difference meter, and measure thickness by Density Measuring Instrument, write down corresponding data, then, data according to obtaining are drawn a design, and time consistent with original copy color by range estimation (general needs many people range estimation) specimen page of drawing a design, reach the object of reduction original copy.
But in actual production, the image copied and original image, standard is met by detecting, color looks it is on all four, when printing in concrete commodity packaging, but there is deviation in color: difference is also larger sometimes, makes commodity packaging not fully up to expectations, when printing equipment, material and operating technology are all without exception, its main cause is the metamerism phenomenon in color science.
Often kind of object has its fixing optical characteristics, and which coloured light it absorbs in other words, and the character reflecting which coloured light is fixing.Under the daylight that spectrum is complete, the color of often kind of object is fixing.So-called solid colour is constant, the optical characteristics just referring to object and the color presented in the sunlight constant.But, when the spectral component of light source changes, both the monochromatic light of a certain wave-length coverage had been lacked in light source, and the coloured light that the optical characteristics that the coloured light of this wave-length coverage is jobbie reflects, so this object does not just demonstrate its solid colour under this light source, and presents different colors.This color presented under certain light source when a pair color is identical, but under other light source, its color presented changes, and this phenomenon is just called metamerism phenomenon.In this change, the spectroscopic data of object itself is constant, that is spectroscopic data is the surface nature describing color body, with the change of working flare, observer is different, and clone method difference is all without impact, and object color is relevant with the spectral power distribution of reflection (transmission) light, but not one_to_one corresponding, the color sensation (i.e. blend of colors metamerism phenomenon) that many luminous energy that thus spectral distribution is different cause human eye same.
In application, metamerism refers to same group of color, simple, and be exactly that LAB is identical, color is different, and its reason is exactly that spectral reflectance curve is different.Thus, observe under a certain specific light source, no matter in form and aspect, lightness or saturation, may all there is certain difference.
Color-control technique existing defects in current printing enterprise, prior art haves much room for improvement and improves.
Summary of the invention
In view of the deficiencies in the prior art, the object of the invention is to provide a kind of color method of reducing based on spectrum analysis and system.Due to metamerism phenomenon when being intended to solve color reduction in prior art, the product of the actual production caused and the larger problem of original copy heterochromia.
Technical scheme of the present invention is as follows:
Based on a color method of reducing for spectrum analysis, wherein, said method comprising the steps of:
S1, spectroanalysis instrument scan the white space in original copy, obtain the first spectral information M1 of stock in original copy;
S2, from the spectral information database set up in advance, select there is the stock with the same or analogous spectral information of the first spectral information M1;
S3, spectroanalysis instrument scan the region being printed with ink in original copy, obtain the second spectral information M2;
S4, the second spectral information M2 and the first spectral information M1 to be subtracted each other, obtain the 3rd spectral information M3;
S5, from the spectral information database set up in advance, select that there is the ink with the same or analogous spectral information of the 3rd spectral information M3, then print on the stock that obtains in step s 2, thus achieve the color reduction of original copy.
The described color method of reducing based on spectrum analysis, wherein, also comprises step S0, carries out spectrum analysis respectively to dissimilar stock and ink, obtain its spectral information, be stored in spectral information database.
Based on a color restoring system for spectrum analysis, wherein, comprising:
First scanning element, scans the white space in original copy for controlling spectroanalysis instrument, obtains the first spectral information M1 of stock in original copy;
Stock selected cell, for from the spectral information database set up in advance, selects to have the stock with the same or analogous spectral information of the first spectral information M1;
Second scanning element, scanning the region being printed with ink in original copy for controlling spectroanalysis instrument, obtaining the second spectral information M2;
Processing unit, for being subtracted each other by the second spectral information M2 and the first spectral information M1, obtains the 3rd spectral information M3;
Reduction unit, for from the spectral information database set up in advance, select that there is the ink with the same or analogous spectral information of the 3rd spectral information M3, be then printed on the stock that obtains in stock selected cell, thus achieve the color reduction of original copy.
The described color restoring system based on spectrum analysis, wherein, also comprises database generation unit, for carrying out spectrum analysis respectively to dissimilar stock and ink, obtaining its spectral information, being stored in spectral information database.
Beneficial effect: the color method of reducing based on spectrum analysis provided by the invention and system, it is different from the color method of reducing based on color analysis in prior art, but by the spectral information of the spectral information and ink that test out stock, choose identical with it or akin stock and ink, realize color reduction, ensure that color is observed under any light source, no matter in form and aspect, lightness or saturation, all ensure consistent with original copy.
Accompanying drawing explanation
The most preferred embodiment flow chart of a kind of color method of reducing based on spectrum analysis of Fig. 1 the present invention.
The structured flowchart of the most preferred embodiment of a kind of color restoring system based on spectrum analysis of Fig. 2 the present invention.
Embodiment
The invention provides a kind of color method of reducing based on spectrum analysis and system, for making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, a kind of color method of reducing based on spectrum analysis provided by the invention, comprising following steps:
S1, spectroanalysis instrument scan the white space in original copy, obtain the first spectral information M1 of stock in original copy;
S2, from the spectral information database set up in advance, select there is the stock with the same or analogous spectral information of the first spectral information M1;
S3, spectroanalysis instrument scan the region being printed with ink in original copy, obtain the second spectral information M2;
S4, the second spectral information M2 and the first spectral information M1 to be subtracted each other, obtain the 3rd spectral information M3;
S5, from the spectral information database set up in advance, select that there is the ink with the same or analogous spectral information of the 3rd spectral information M3, then print on the stock that obtains in step s 2, thus achieve the color reduction of original copy.
Describe in detail for above-mentioned steps respectively below:
Described step S1 utilizes spectroanalysis instrument to scan the white space in original copy, obtains the first spectral information M1 of stock in original copy.Original copy is the stock being printed with ink, it comprises ink and stock two parts, and first, we carry out spectrum analysis with spectroanalysis instrument to stock: the white space (not being printed with ink part) namely in original copy, obtain the first spectral information M1 of stock in original copy, and record.Wherein, gather spectral information about spectroanalysis instrument, it is prior art, has just repeated no more here.
Described step S2 is from the spectral information database set up in advance, selects to have the stock with the same or analogous spectral information of the first spectral information M1.Wherein, spectral information database includes dissimilar stock and the spectral information of ink, we choose or akin spectral information identical with the first spectral information M1 from spectral information database, then determine the model of the stock corresponding with it and thickness (adopting identical with model with the thickness of the stock in original copy) as far as possible.
Described step S3 is that spectroanalysis instrument scans the region being printed with ink in original copy, obtains the second spectral information M2.This step is scanned the region being printed with ink in original copy by spectroanalysis instrument, and its spectral information M2 obtained is equivalent to the spectral information of ink and the spectral information sum of stock.
Therefore, subtracted each other by the second spectral information M2 and the first spectral information M1 in described step S4, obtain the 3rd spectral information M3, thus, described 3rd spectral information M3 is the spectral information of ink.
Finally, from the spectral information database set up in advance in described step S5, select that there is the ink with the same or analogous spectral information of the 3rd spectral information M3, then print on the stock that obtains in step s 2, thus achieve the color reduction of original copy.
Core concept of the present invention utilizes metamerism theoretical, and solve in prior art when LAB is identical, color is different phenomenon (its reason is exactly that spectral reflectance curve is different).It is by the spectral information of the spectral information and ink that test out stock, choose identical with it or akin stock and ink, realize color reduction, ensure that color is observed under any light source, no matter in form and aspect, lightness or saturation, all ensure consistent with original copy.
Further, also comprise step S0, respectively spectrum analysis is carried out to dissimilar stock and ink, obtain its spectral information, be stored in spectral information database.
Present invention also offers a kind of color restoring system based on spectrum analysis, as shown in Figure 2, it comprises:
First scanning element 100, scans the white space in original copy for controlling spectroanalysis instrument, obtains the first spectral information M1 of stock in original copy;
Stock selected cell 200, for from the spectral information database set up in advance, selects to have the stock with the same or analogous spectral information of the first spectral information M1;
Second scanning element 300, scanning the region being printed with ink in original copy for controlling spectroanalysis instrument, obtaining the second spectral information M2;
Processing unit 400, for being subtracted each other by the second spectral information M2 and the first spectral information M1, obtains the 3rd spectral information M3;
Reduction unit 500, for from the spectral information database set up in advance, select that there is the ink with the same or analogous spectral information of the 3rd spectral information M3, be then printed on the stock that obtains in stock selected cell, thus achieve the color reduction of original copy.
The details that realizes of the described color restoring system based on spectrum analysis is all described in detail in the above-mentioned methods, has stated here with regard to no longer superfluous.
Further, the described color restoring system based on spectrum analysis also comprises database generation unit, for carrying out spectrum analysis respectively to dissimilar stock and ink, obtaining its spectral information, being stored in spectral information database.
In sum, color method of reducing based on spectrum analysis of the present invention and system, it is different from the color method of reducing based on color analysis in prior art, but by the spectral information of the spectral information and ink that test out stock, choose identical with it or akin stock and ink, realize color reduction, ensure that color is observed under any light source, no matter in form and aspect, lightness or saturation, all ensure consistent with original copy.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (4)
1., based on a color method of reducing for spectrum analysis, it is characterized in that, said method comprising the steps of:
S1, spectroanalysis instrument scan the white space in original copy, obtain the first spectral information M1 of stock in original copy;
S2, from the spectral information database set up in advance, select there is the stock with the same or analogous spectral information of the first spectral information M1;
S3, spectroanalysis instrument scan the region being printed with ink in original copy, obtain the second spectral information M2;
S4, the second spectral information M2 and the first spectral information M1 to be subtracted each other, obtain the 3rd spectral information M3;
S5, from the spectral information database set up in advance, select that there is the ink with the same or analogous spectral information of the 3rd spectral information M3, then print on the stock that obtains in step s 2, thus achieve the color reduction of original copy.
2. the color method of reducing based on spectrum analysis according to claim 1, is characterized in that, also comprises step S0, carries out spectrum analysis respectively to dissimilar stock and ink, obtain its spectral information, be stored in spectral information database.
3., based on a color restoring system for spectrum analysis, it is characterized in that, comprising:
First scanning element, scans the white space in original copy for controlling spectroanalysis instrument, obtains the first spectral information M1 of stock in original copy;
Stock selected cell, for from the spectral information database set up in advance, selects to have the stock with the same or analogous spectral information of the first spectral information M1;
Second scanning element, scanning the region being printed with ink in original copy for controlling spectroanalysis instrument, obtaining the second spectral information M2;
Processing unit, for being subtracted each other by the second spectral information M2 and the first spectral information M1, obtains the 3rd spectral information M3;
Reduction unit, for from the spectral information database set up in advance, select that there is the ink with the same or analogous spectral information of the 3rd spectral information M3, be then printed on the stock that obtains in stock selected cell, thus achieve the color reduction of original copy.
4. the color restoring system based on spectrum analysis according to claim 3, it is characterized in that, also comprise database generation unit, for carrying out spectrum analysis respectively to dissimilar stock and ink, obtain its spectral information, be stored in spectral information database.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410727139.6A CN104580819A (en) | 2014-12-04 | 2014-12-04 | Spectral-analysis-based color restoration method and system |
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| CN201410727139.6A CN104580819A (en) | 2014-12-04 | 2014-12-04 | Spectral-analysis-based color restoration method and system |
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| CN104580819A true CN104580819A (en) | 2015-04-29 |
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Cited By (1)
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| CN107443944A (en) * | 2016-05-10 | 2017-12-08 | 海德堡印刷机械股份公司 | For generating the method drawn a design |
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| JP2003320727A (en) * | 2002-05-07 | 2003-11-11 | Seiko Epson Corp | Print controller and medium storing its operating program |
| CN102756549A (en) * | 2012-05-04 | 2012-10-31 | 中国印刷科学技术研究所 | Proofing color consistency control method based on observed light source |
| CN103612483A (en) * | 2013-12-06 | 2014-03-05 | 中国印刷科学技术研究所 | Printing ink color matching method based on spectral matching |
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Patent Citations (3)
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| JP2003320727A (en) * | 2002-05-07 | 2003-11-11 | Seiko Epson Corp | Print controller and medium storing its operating program |
| CN102756549A (en) * | 2012-05-04 | 2012-10-31 | 中国印刷科学技术研究所 | Proofing color consistency control method based on observed light source |
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| CN107443944A (en) * | 2016-05-10 | 2017-12-08 | 海德堡印刷机械股份公司 | For generating the method drawn a design |
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