CN103196560B - Chroma characterization and detection method of grating base columnar rainbow hologram - Google Patents
Chroma characterization and detection method of grating base columnar rainbow hologram Download PDFInfo
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- CN103196560B CN103196560B CN201310118581.4A CN201310118581A CN103196560B CN 103196560 B CN103196560 B CN 103196560B CN 201310118581 A CN201310118581 A CN 201310118581A CN 103196560 B CN103196560 B CN 103196560B
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Abstract
The invention provides chroma characterization and a detection method of a grating base columnar rainbow hologram. A line-shaped even white light source is used and illuminates a columnar grating sample in a length direction of light source lines and along a long cross section direction of a columnar grating column. A line-shaped pixel array optical receiver receives reflecting light in a normal direction of the surface of the sample. A calculation relation between optical response of the optical receiver and chroma of the illuminated sample is confirmed. By means of a calculation relation between reflecting light received by the optical receiver and color, optical information in a sufficient length in the long cross section direction of the columnar grating column is converted into CIELab chroma information. Values of L*, a* and b* and variation rules of the CIELab chroma information are analyzed in terms of the obtained CIELab chroma information, and periodic information on space variation of the L* is obtained. The detection method can be achieved by a linear CCD scanning device and is simple, fast and capable of being used for color quality control of columnar laser paper and printed images of the columnar laser paper.
Description
Technical field
The colourity that the present invention relates to a kind of grating pilum shape rainbow hologram characterizes and detection method, the method can be used for colorimetric detection and the evaluation of column grating laser paper and process color hologram thereof, and then produces and the colourity quality control of package printed matter for column grating laser paper.
Background technology
At present, in the packaging of the commodity such as high-grade tobacco and wine, conventional column grating-based rainbow paper.On this paper, has periodic column grating, under white light, watch and have periodically different height reflection iris from different angles, the rainbow effect of sparking flicker has greatly increased the additional quality of product, therefore be, often that the packaging of the commodity such as medium and high classes cigarette and drinks is selected.
The surface of this grating base laser paper has diffraction to the reflected light of incident light, thereby forms different monochromatic light at the relevant rainbow phenomena of strengthening of different diffraction direction.But because grating base has directivity, and often also have certain macroscopic pattern (as column grating-based rainbow paper, thering is periodic cylindricality pattern), caused the significant difference of diverse location place color characteristic.Thereby, when watching this laser holographic figure, watch different positions in same angle, or while watching same position with different angles, all show as different color perceptions.At present, no matter be visual observation, or application is suitable for the shades of colour surveying instrument of even color measuring, is all difficult to accurately characterize the color of this stock, bring difficulty to its quality control.Thereby the color table of this series products is sought peace to detect to evaluate and is seemed particularly important.
National standard has been made regulation to the characteristic index of false proof holography paper (containing laser paper), and has provided detection method (specifically can referring to GB/T18733-2002, GB/T18734-2002).Wherein, characterized the coloured light diffractive features of grating by signal to noise ratio snr and diffraction efficiency.But, due to its detection method more complicated, and also colourity and variation characteristic thereof that can not Complete Characterization holographic grating, therefore, see with regard to current applicable cases, characterize for the colourity of holographic papers, particularly the application in Packaging and Printing Enterprises lacks practicality.
Domestic and international many research institutions analyze the colouration mechanism of laser paper grating, have also proposed multiple colourity and spectral method of detection.The method of analyzing such as the deviation of the integrated color difference under different measuring angle on a certain bin of laser paper; Test gratings parameter, select suitable light color filter, then irradiate the measurement of lower light reflectivity by diffused light, realize the method to laser paper colour measurement; Etc..But there is same problem in these methods, i.e. testing process complexity, equipment requirement is high, detects stability and is difficult to ensure, is still unsuitable for the widespread use in actual production.
Summary of the invention
The object of the present invention is to provide a kind of color table that can evaluate convenient, fast, accurately, on a macro scale grating pilum shape rainbow figure detection method of seeking peace, class laser paper provides technical support in the chromaticity control of holographic false proof, rainbow holography packages printing for this reason.
The colourity of grating pilum shape rainbow hologram of the present invention characterizes and detection method, obtain under specific light path the chrominance information in sufficient length in grating column length cross-directional, characterized the color characteristics of its rainbow hologram by this chromaticity, can be used for detecting the color characteristics of grating pilum shape rainbow body paper and printed matter thereof.
The colourity of grating pilum shape rainbow hologram characterizes and a detection method, comprises the following steps:
(1) adopt wire equal white light light source, irradiate column grating sample with light source line length direction along the cross-directional of column grating column length, and receive reflected light in sample surface normal direction with the optical receiver of wire pel array;
(2) determine the photoresponse of optical receiver used with by the calculated relationship of this colourity in the same old way;
(3) reflected light and the color calculated relationship that are received by optical receiver in step (1), convert the optical information in sufficient length in column grating column length cross-directional to CIELab chrominance information;
(4) CIELab chrominance information step (3) being obtained, analyzes numerical value and the Changing Pattern of its L*, a* and b*, and obtains the spatial variations periodical information of L*;
(5), according to testing goal, select the periodic proper value of application lightness L* and/or apply L*, a* and the color characteristics of the column grating hologram that the whole color characteristic information representations of b* obtain;
(6) master sample and the color distortion of measuring sample (than sample) are evaluated, according to human-eye visual characteristic, determined L*, a*, b* and the aberration numerical value that in different application, should control, and the tolerance that allows of L* value periodicity, for the production of quality control.
Optical receiver in step (2) can be directly to obtain the catoptrical instrument of each pixel (as scanning optical spectrum camera), can be also that each pixel reflected light is responded to the instrument (as flat bed scanner) for rgb value.The catoptrical instrument that directly obtains each pixel, can directly calculate corresponding CIELab chromatic value by the reflected light of pixel and colorimetry theory; First the instrument that response is rgb value to each pixel reflected light, need carry out color correction to this instrument, sets up the mathematical relation that instrument is checked colors between the RGB CIELab chromatic value corresponding to it of photoresponse.
The column raster image resolution that described optical receiver forms needs the requirement of fit analysis precision, can between 150dpi～300dpi, select.
In step (3), convert the optical information at least one complete grating Cycle Length in column grating column length cross-directional to CIELab chrominance information.
The testing light source adopting is wire standard white light, and colour temperature is 5000K～6500K; The angle of white light is preferably between 30 °～60 °.
The present invention is vertical with the column length direction of laser paper column grating with the line direction of wire white light, and irradiates with the normal of laser paper sample surface mode at an angle, receives reflected light in the normal direction of sample surface; Utilize the linear reflection light receiving to characterize vision colourity under this irradiation white light, in this observed ray of column grating and the periodically variable feature with position.Chromaticity under this specific light travel permit part in column grating cross-directional, not only contain the chrominance information of each position, also have it by the cyclical variation information of cylindricality periodic arrangement, be applicable to the sign of column grating base radium-shine figure self color and the comparison with standard specimen color.This detection method can be realized by linear CCD scanning device, and method is simple, quick, can be used for the chromaticity control of column grating base laser paper and printing images thereof.
Brief description of the drawings
Fig. 1 is the optical system for testing layout that the present invention adopts.
Fig. 2-1 and Fig. 2-2 are respectively the standard specimen of the embodiment of the present invention 1 and than the hologram sampled images of sample.
Fig. 3 is the testing tool color response colour gamut of the embodiment of the present invention 1 and the CIELab chromatic diagram of sample.
Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) are the embodiment of the present invention 1 standard specimen and than the colourity variation diagram of the hologram of sample; The change in location figure that wherein Fig. 4 (a) is L* value, the change in location figure that Fig. 4 (b) is a* value, the change in location figure that Fig. 4 (c) is b* value.
Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) are the embodiment of the present invention 1 standard specimen and than the colourity variation diagram after the hologram position alignment of sample; Wherein Fig. 5 (a) is the change in location figure of L* value after aiming at, and Fig. 5 (b) is the change in location figure of a* value after aiming at, and Fig. 5 (c) is the change in location figure of b* value after aiming at.
Embodiment
Further illustrate the present invention below in conjunction with drawings and Examples, but can not be used for limiting the scope of the invention.
In production quality control, often have master sample and detect sample, master sample be enterprise as whether up-to-standard normative reference, detect sample be produce in product.This embodiment gets respectively 200mm × 200mm column grating radium-shine body paper master sample of base (being called standard specimen) and detects sample (being called than sample) each one, implements test process and analysis.
Pacing items is as follows:
Sample: two radium-shine body paper of silver-colored light beam column grating base, standard specimen and compare sample
Instrument: wire pel array optical receiver (containing light source) adopts professional color scanner Epson GT-X970
Scanning sample resolution: 200pdi
Step 1, adopts professional color scanner Epson GT-X970 as wire equal white light source lighting and light-receiving instrument, realizes the Optical Sampling process of sample of colour in the present embodiment technical scheme, and its sampling light path as shown in Figure 1.
Place sample, make the light source line length in scanner wire equal white light source along the cross-directional of column grating column length, source light, with certain angle as 30 ° of irradiations, receives reflected light in the normal direction of sample surface with wire pel array optical receiver.
Apply before this scanner, first suitable sweep parameter is set, be specially: file type is selected reflection original text, color type is selected 24 colours, tone curve is selected linear, brightness, contrast, color balance etc. are selected default setting, and cancel all automatic processing capacities, to ensure stable and suitable photoresponse., determine column grating paper on along column length direction and scanning area that with it vertical direction up-sampling dimension be respectively about 5mm and 160mm scan, obtain the image of two sample bmp forms thereafter.As shown in Fig. 2-1 and Fig. 2-2, be respectively two laser paper sample standard specimens and than the hologram sampled images of sample.
Step 2, determine the photoresponse of Line of light receiver used with by the calculated relationship of colourity in the same old way: utilize business tool software, set up the ICC standard feature file of scanner, obtain the photoresponse value RGB of scanner with by the conversion calculated relationship of cie color value in the same old way.ICC standard feature file is international standard, and color relation is wherein the data look-up table relation of standard.
Step 3, utilize above-mentioned color characteristics relation, by the RGB response of scan image, the convertible CIELab chromatic value that obtains corresponding color, is converted to CIELab chrominance information by the optical information at least one complete grating Cycle Length in the long cross-directional of column grating pilum.Shallow undercolor region A in Fig. 3 is the color gamut that this scanner can respond, and is called colour gamut; The scan image CIELab numerical value obtaining is carried out along being averaging in column length direction, and its mean value is as the dark color point B in Fig. 3, be from scanner light path institute " " to the color colourity of laser holographic figure.Can see, these colors all in the color response colour gamut of this scanner, thereby ensured to calculate the reliability of gained laser holographic figure color.
Step 4, the radium-shine body paper sampling standard specimen of two grating pilum shapes obtaining in plot step 3 and than the colourity variation diagram of sample hologram (scan image along the average CIELab value in column length direction with change in location figure), obtain standard specimen and than the CIELab colourity cyclical variation information of sample, can analyze numerical value and the Changing Pattern of its L*, a* and b*, obtain its spatial variations cycle, as shown in Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c).Wherein, 1: standard specimen, 2: compare sample.
Analyzable chrominance information comprises:
(1) L* value period of change
Spacing with minimum L* value point in Fig. 4 (a) is determined the grating cycle.
As shown in Fig. 4 (a), two minimum L* value point intervals of standard specimen are very approaching, and be T the average period obtaining
1=0.020(week/mm); Equally, also very more approaching than two of sample minimum L* value point intervals, be also T the average period obtaining
2=0.020(week/mm), showing has the lightness period of change identical with standard specimen than sample.
Its calculated relationship is as follows:
T
1=f/25.4 × [(t
11+ t
12)/2]=0.0204(week/mm)=0.020(week/mm)
T
2=f/25.4 × [(t
21+ t
22)/2]=0.0203(week/mm)=0.020(week/mm)
Wherein f is scanning resolution, is 200dpi in this embodiment.
The L* value spatial variations cycle obtaining has thus been reflected the cylindricality feature of laser paper, is the basis of the shallow and change color of its packages printing application China and Mexico color depth.
(2) color distortion
The L* of standard sample and sample, a*, b* sampled value are aimed at respectively in identical period of change, obtain the radium-shine body paper sampling standard specimens of two grating pilum shapes and than the colourity variation diagram after the hologram position alignment of sample; Wherein Fig. 5 (a) is the change in location figure of L* value after aiming at, and Fig. 5 (b) is the change in location figure of a* value after aiming at, and Fig. 5 (c) is the change in location figure of b* value after aiming at, wherein, and 1: standard specimen, 2: compare sample.
Can from Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c), the difference of two samples at different parts can be seen intuitively, and the average value difference in this sampling overlapping region can be given in.In this embodiment, the mean difference of L*, a*, b* value is respectively 2.59 ,-0.49 and 1.84, and corresponding aberration is 3.21.
Further, also can pay close attention to the colouring information of local location, analyze in more detail the colourity difference than sample and standard specimen.In this embodiment, can see from Fig. 5 (a), larger lightness L* difference occurs in 1～200,450～550 and 800～900 pixel position, can ask for respectively its difference and characterize departing from of sample and standard sample, improve with the processing quality that instructs diverse location in body paper production or pattern printing.
In addition, also can find out from Fig. 5 (b) and Fig. 5 (c), in sample range, a*, b* chromatic value do not show the complete cycle, but find out obvious symmetry characteristic.Its difference mainly occurs in 1～200 pixel position, and the difference of b* is also more obvious between 800～900 pixels.
Change from L*, a*, b* entirety colourity, mainly occur in region between 1～200 and 800～900 location of pixels than the colourity difference of sample and standard specimen, all comprising the transient process to shadow by high light.
Step 5, selects suitable Detection of content according to testing goal.
According to testing goal, can select to apply the periodic proper value of lightness L* and the color characteristics of L*, a* and whole these column grating holograms of color characteristic information representation of b*.
No matter still print the quality of colour control after curing ink for body paper, all can pay close attention to variation and the look extent thereof of L*, a*, b* simultaneously.Sample and standard sample, at difference and the look extent of three chromatic values in each locus place, all reflect the quality of colour than sample, can describe in detail respectively.
As in this embodiment, seen by Fig. 5 after spacial alignment (a)～Fig. 5 (c), all have some difference than the L* between sample and standard specimen, a*, b* value, the mean difference in sample range is respectively 2.59 ,-0.49 and 1.84, and aberration is 3.21; The wherein difference maximum of lightness.And in different positions, L*, a*, b* and corresponding aberration are had nothing in common with each other.If taking the region of 3mm length (dimension of conventional color measurement instrument sampling Circularhole diameter) as a sampling unit, can obtain the colourity difference on unit; Wherein minimum aberration is 0.83, and maximum aberration is 16.53, but the quantity of large aberration is also few, mainly occurs between 1～200 location of pixels, therefore, need carry out concern especially to the technological parameter of this band of position in producing, and adjust.
In addition, for body paper, unusual except above-mentioned colour difference, also have the spatial variations of L* value periodically, the optical cycle property of reflection body paper glazing grid base.In this embodiment, obtained the L* value period of change T of standard specimen by Fig. 4 (a)
1for t
11and t
12the mean value 0.020(week/mm of corresponding space periodic), than the L* value period of change T of sample
2for t
21and t
22the mean value of corresponding space periodic is also 0.020(week/mm), show to there is identical grating base optical cycle property than sample and standard specimen, good basis has been laid in the quality assurance after this contrast sample printing mass colour.
Step 6, in the color distortion of sample and standard sample is evaluated, can be according to the measurement item of its application purpose and concern, and according to the visual characteristic of human eye, determine L*, a*, b* value and the CIELab aberration that should control, and the tolerance that allows of L* value periodicity, for the production of quality control.
In this embodiment, radium-shine body paper is more identical than the L* value spatial variations cycle of sample and standard specimen; CIELab average color difference between sample and standard sample is 3.21, and product quality testing staff observes in standard inspection box, finds just can find out the difference of two samples.For the radium-shine body paper of column grating, L* value spatial variations cycle and chromaticity index are all very important, and the cycle is more approaching, and CIELab aberration is less, more meets the requirements than the quality of sample.
The process color that no matter is still printed on ink for body paper, what kind of franchise L*, a*, b* and CIELab aberration between sample and standard sample arrange actually, need further set according to its concrete application and quality requirements.
Claims (7)
1. the colourity of grating pilum shape rainbow hologram characterizes and a detection method, comprises the following steps:
(1) adopt wire equal white light light source, the cross-directional with light source line length direction along column grating column length, irradiates column grating sample, and receives reflected light in sample surface normal direction with the optical receiver of wire pel array;
(2) determine the photoresponse of optical receiver used with by the calculated relationship of this colourity in the same old way;
(3) reflected light being received by optical receiver and the calculated relationship of color, convert the optical information in certain length in column grating column length cross-directional to CIELab chrominance information;
(4), to the CIELab chrominance information obtaining, analyze numerical value and the Changing Pattern of its L*, a* and b*, and obtain the spatial variations periodical information of L*;
(5) select the periodic proper value of application lightness L* and/or apply L*, a* and the color characteristics of the column grating hologram that the whole color characteristic information representations of b* obtain;
(6) to master sample with measure the color distortion of sample and evaluate, determine L*, a*, b* and the aberration numerical value in different application, controlled, and the tolerance that allows of L* value periodicity, for the production of quality control.
2. the colourity of grating pilum shape rainbow hologram according to claim 1 characterizes and detection method, it is characterized in that: described white light source is standard white light, and colour temperature is 5000K～6500K.
3. the colourity of grating pilum shape rainbow hologram according to claim 1 characterizes and detection method, it is characterized in that: described optical receiver is directly to obtain the catoptrical instrument of each pixel, or the instrument that is rgb value to each pixel reflected light response.
4. the colourity of grating pilum shape rainbow hologram according to claim 3 characterizes and detection method, it is characterized in that: to the catoptrical instrument of the each pixel of direct acquisition, directly calculate corresponding CIELab chromatic value by reflected light and the colorimetry theory of pixel.
5. the colourity of grating pilum shape rainbow hologram according to claim 3 characterizes and detection method, it is characterized in that: the instrument that is rgb value for each pixel reflected light response, first this instrument is carried out to color correction, set up the mathematical relation that instrument is checked colors between the RGB CIELab chromatic value corresponding to it of photoresponse.
6. the colourity of grating pilum shape rainbow hologram according to claim 1 characterizes and detection method, it is characterized in that: the column raster image resolution that described optical receiver forms is between 150dpi～300dpi.
7. the colourity of grating pilum shape rainbow hologram according to claim 1 characterizes and detection method, it is characterized in that: convert the optical information at least one complete grating Cycle Length in column grating column length cross-directional to CIELab chrominance information.
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| CN103595998B (en) * | 2013-11-01 | 2015-06-03 | 西安电子科技大学 | Device and method for testing colors of colored CCD chip |
| CN103712919B (en) * | 2013-11-02 | 2015-12-30 | 深圳市科彩印务有限公司 | A kind of sign of native-surface laser paper color characteristics and detection method |
| CN103575399B (en) * | 2013-11-20 | 2015-04-22 | 深圳市科彩印务有限公司 | Method for measuring colors of light-pole laser paper |
| CN104849216B (en) * | 2014-02-18 | 2016-12-14 | 永发印务(东莞)有限公司 | A kind of laser paper leaflet detection method based on polarization |
| CN103852430B (en) * | 2014-03-28 | 2016-04-13 | 北京印刷学院 | A kind of measurement of aluminium paper POP ink printing look and characterizing method |
| CN104062013B (en) * | 2014-07-10 | 2016-06-29 | 北京印刷学院 | A kind of color projectional technique of smooth base for post laser paper leaflet |
| CN104568781A (en) * | 2015-02-05 | 2015-04-29 | 北京印刷学院 | Method for automatically detecting and evaluating color of laser beam emitting paper and quality of laser beams |
| CN105424191B (en) * | 2015-11-05 | 2017-05-31 | 北京印刷学院 | A kind of color measurement method of light beam laser paper |
| RU2644513C1 (en) | 2017-02-27 | 2018-02-12 | Общество с ограниченной ответственностью "СМАРТ ЭНДЖИНС СЕРВИС" | Method of detecting holographic elements in video stream |
| CN109827657B (en) * | 2019-03-12 | 2024-03-01 | 深圳劲嘉集团股份有限公司 | Method and device for measuring grating constant of plain laser material |
| CN110806388B (en) * | 2019-11-20 | 2022-05-27 | 河南牧业经济学院 | Dark light column positioning device, positioning method and color measurement method of columnar laser paper |
| CN110806389B (en) * | 2019-11-20 | 2022-05-27 | 河南牧业经济学院 | Device and method for detecting color quality of columnar laser paper |
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| US7605911B2 (en) * | 2007-10-10 | 2009-10-20 | Applied Extrusion Technologies, Inc. | System and method for visual quality characterization of holographic materials |
| CN101915617B (en) * | 2010-07-26 | 2012-08-15 | 武汉大学 | Grating-based rainbow hologram chromaticity detection and evaluation method |
| CN102538970B (en) * | 2010-12-08 | 2014-02-26 | 武汉红金龙印务股份有限公司 | Spectrophotometer for chromaticity detection of laser paper |
| CN102782483B (en) * | 2011-03-31 | 2014-04-30 | 深圳市科彩印务有限公司 | Method for detecting laser paper |
| CN202533174U (en) * | 2012-03-20 | 2012-11-14 | 苏州大学 | Color measuring device for color hologram |
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