CN110662010B - Redundancy color control method - Google Patents
Redundancy color control method Download PDFInfo
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- CN110662010B CN110662010B CN201910919144.XA CN201910919144A CN110662010B CN 110662010 B CN110662010 B CN 110662010B CN 201910919144 A CN201910919144 A CN 201910919144A CN 110662010 B CN110662010 B CN 110662010B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/643—Hue control means, e.g. flesh tone control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
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Abstract
The invention discloses a redundancy color control method, which adopts at least three standard color cards to respectively carry out color control shooting on the same article corresponding to the standard color cards with different models, and then carry out appearance shooting on the same article; then utilizing color analysis software matched with the standard color cards to manufacture ICC color files corresponding to the standard color cards; respectively calling ICC color files corresponding to the standard color cards in digital photo post-processing software, performing color restoration to obtain a photo after color restoration, performing color value analysis on the photo after color restoration, and calculating a color difference value; selecting a standard color card corresponding to the color difference value at the middle value as a color correction standard, and taking an ICC color file corresponding to the color correction standard as a color correction standard file; and importing the photos shot in the appearance into digital photo post-processing software, and referring to a color correction reference file to perform color restoration. The method and the device adopt the redundancy color card for collection, analysis and screening, and improve the accuracy and the reliability of color restoration.
Description
Technical Field
The invention relates to the technical field of article restoration, in particular to a redundancy color control method.
Background
At present, color control of digital photography is realized by a color management system method. The method generally establishes an ICC PROFILE color file for digital image input equipment (such as a camera) and output equipment (such as a display) through the identification of a standard photographic color card, and the colors of the digital images on the equipment are as consistent as possible through the transmission of the color file in different equipment.
The methods generally employed include: at an input end, shooting a corresponding standard color card in a nominal fixed light source environment of a color card production factory, performing color identification in standard color card analysis software, generating an ICC color file of an output device (camera), and establishing a digital photography ICC characteristic file; at the output end, under the stable light source environment, color measurement analysis is carried out on output end equipment (such as a display) by utilizing color correction equipment, and the color file of the output equipment can be analyzed by the software of the color correction equipment and the color of the equipment is correspondingly corrected so as to realize correct display of the color and facilitate later-stage manual interpretation of color accuracy; finally, the corrected output device is used to call up the camera ICC file in the digital image processing software. The software color is corrected through the ICC file, other digital images read currently in the software environment are achieved, real-time color correction is conducted according to the current ICC color attribute, and color restoration of the digital images is completed.
However, in the process of engineering digital photography, the method of color control using color cards is usually affected by many uncertainties. In actual operation, the light source and the working environment do not necessarily satisfy the standard environment of each color card manufacturer, so the minimum color difference obtained in the non-standard environment of engineering application does not necessarily represent the best reduction degree of the manufacturer, and the minimum color difference value cannot be realized. For example, the irregular color difference of the color control image with the color card can occur due to factors such as unfixed shooting environment, interference of ambient light on the light source condition, natural fading of the color card due to high use frequency, influence of the color of the object on the color card, and the like. Therefore, the color control of the single color card or the two-color card commonly used in the industry often results in insufficient criterion for determining the color reduction effect and reduced accuracy due to uncertainty in the process.
Therefore, how to improve the accuracy of color reduction and realize high reduction of the device is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a redundancy color control method, which adopts a redundancy mode, selects one of three color reduction standards with highest reduction consistency as a correction reference through transverse comparison of color difference values of a plurality of color cards, and obtains a color reduction effect with higher reduction degree and reliability.
The above object of the present invention is achieved by the following technical solutions:
a method for controlling redundancy color, comprising the steps of:
s1, adopting at least three standard color cards to perform color control shooting on the same article corresponding to the standard color cards of different models respectively, and then performing appearance shooting on the same article;
s2, establishing a standard color display environment;
s3, utilizing color analysis software matched with the standard color cards to manufacture ICC color files corresponding to the standard color cards; respectively calling ICC color files corresponding to the standard color cards in the digital photo post-processing software to perform color restoration to obtain a photo with restored colors;
s4, analyzing the color value of the photo after color restoration, and calculating the color difference value;
s5, selecting a standard color card corresponding to the color difference value at the middle value as a color correction reference, and taking an ICC color file corresponding to the color correction reference as a color correction reference file;
and S6, importing the photo shot in the appearance into digital photo post-processing software, and referring to a color correction reference file to perform color restoration.
The invention is further configured to: in step S1, 3 to 5 color cards are selected according to the redundancy theory, and the brands and specifications of the color cards are different.
The invention is further configured to: in step S1, the object to be photographed is fixed and placed in the same time slot, the same work environment, the same light source and the same photographing device, the standard color cards of different models are respectively placed in the same position, that is, the relative positions of the standard color cards and the object to be photographed are fixed, the color control photo shooting is sequentially performed, the standard color cards are cancelled, and the appearance of the object to be photographed is shot.
The invention is further configured to: in step S2, under a stable light source environment, a color correction device is used to perform color measurement analysis on the display device and perform corresponding color correction.
The invention is further configured to: in step S3, the corrected display device is used to call the ICC files corresponding to the standard color cards in the same digital image post-processing software, and perform color restoration operation on the corresponding color control photos to obtain color-restored photos.
The invention is further configured to: in step S4, the method includes the steps of:
a1, respectively selecting a color block on a standard color card in a photo after color restoration in the digital image post-processing software, and respectively reading the number of color values corresponding to the color block in the same color mode;
and A3, respectively calculating the color difference between the color value number of each color block and the corresponding standard color value by using a color difference calculation tool to obtain the color difference value corresponding to each standard color card.
The invention is further configured to: in step S5, when 3 standard color cards are used, the color difference value at the middle value is selected, and the standard color card corresponding to the color difference value at the middle value is used as the color correction reference.
The invention is further configured to: in step S5, when more than 3 standard color cards are used, the color difference values with large numerical difference are removed, the 3 closest color difference values are selected, the color difference value with the middle numerical value is selected from the 3 closest color difference values, and the standard color card corresponding to the color difference value with the middle numerical value is used as the color correction standard.
The invention is further configured to: in step S6, the outward appearance photographed picture is imported into a color correction reference file, and color restoration batch processing is performed.
The invention is further configured to: the shot object is a cultural relic.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the color control process of the ware engineering digital photography is completed by adopting the acquisition, analysis and screening of the redundancy color card, so that the accuracy and the reliability of color reduction are improved;
2. furthermore, the color difference values of the multi-color cards are transversely compared to select, so that the influence of external factors on color deviation is eliminated, and the scientificity of color standard selection is improved;
3. further, the standard color card with the highest reduction consistency is selected, and the color reduction effect with high reduction degree and high reliability is obtained.
Drawings
FIG. 1 is a photograph of a color chip 1 used in an embodiment of the present invention;
FIG. 2 is a photograph of a color chip 2 used in an embodiment of the present invention;
FIG. 3 is a photograph of a color chip 3 used in an embodiment of the present invention;
FIG. 4 is a photograph of a color chip 4 used in an embodiment of the present invention;
FIG. 5 is a photographic image of a reduced version of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a redundancy color control method, which comprises the following steps:
s1, adopting at least three standard color cards to perform color control shooting on the same article corresponding to the standard color cards of different models respectively, and then performing appearance shooting on the same article;
s2, establishing a standard color display environment;
s3, utilizing color analysis software matched with the standard color cards to manufacture ICC color files corresponding to the standard color cards; respectively calling ICC color files corresponding to the standard color cards in the digital photo post-processing software to perform color restoration to obtain a photo with restored colors;
s4, analyzing the color value of the photo after color restoration, and calculating the color difference value;
s5, selecting a standard color card corresponding to the color difference value at the middle value as a color correction reference, and taking an ICC color file corresponding to the color correction reference as a color correction reference file;
and S6, importing the photo shot in the appearance into digital photo post-processing software, and referring to a color correction reference file to perform color restoration.
Specifically, in step S1, according to the redundancy theory, the number of the redundancies is 3, preferably 4, and most preferably 5. Therefore, the number of the standard color cards is 3-5, and the brands and the specifications of the color cards are different.
In a specific embodiment of the present application, 4 standard color cards of different brands and different specifications are selected, and the 4 standard color cards are sequentially placed at the same position in front of an object, and multi-redundancy color control shooting is performed under the conditions of the same time period, the same working environment, the same light source and the same photographic equipment, so as to obtain 4 color control shot pictures, as shown in fig. 1-4.
Then, the standard color card is cancelled, and appearance shooting is carried out on the object, including shooting of all surfaces and colors which can be reached by the vision of the object. In order to realize accurate restoration of the objects, appearance shooting of the objects is carried out in batches, and batch appearance shooting pictures are obtained.
In step S2, under a stable light source environment, color measurement analysis is performed on the display device by using a color correction device, the color correction device itself has software to analyze a color file of the display device, and the color of the display device is corrected accordingly, so as to achieve correct display of the color.
In step S3, using a display device with corrected colors and color analysis software matched with the standard color card to make an ICC color file corresponding to each standard color card; in the same digital image post-processing software, the ICC files corresponding to the standard color cards are respectively called, and color reduction operations are performed on the corresponding color control photos, so as to obtain color-reduced photos, as shown in fig. 5.
In step S4, reading color difference data of the color-reduced photograph, and selecting a color difference value, the method includes the following steps:
a1, respectively selecting a color block on each standard color card in the photo after color reduction in a digital image post-processing software photoshop, and respectively reading the color value number corresponding to each color block in an LAB color mode, as shown in Table 1:
table 1:
and A2, respectively calculating the color value number of each color block by using a color difference calculation tool, and calculating the difference value between each color value number and the standard color value corresponding to each color block to obtain the color difference value corresponding to each color block and each standard color card.
Resolving is performed by using a general DE2000 color difference calculation standard to obtain a color difference value, as shown in Table 2:
table 2:
for the selection of the color correction reference color card, the following method is adopted:
when 3 standard color cards are adopted, selecting the standard color card with the color difference value in the middle as a color correction reference after color reduction;
when more than 3 standard color cards are adopted, after color restoration, the standard color card with the largest color-losing difference value deviation is removed, and then the standard color card corresponding to the color difference value in the middle value is selected as a color correction standard from three numerical values with the color difference values close to each other; under the condition, if the difference of the two groups of color difference values is close, selecting one group with relatively small color difference values, removing one group with relatively large color difference values, and selecting the standard color card corresponding to the color difference value in the middle value as the color correction reference from the three numerical values in the selected group;
based on the above method, in this embodiment, the color difference value in fig. 2 is the largest, and is eliminated, and then the color difference values in fig. 1, fig. 3, and fig. 4 are compared, and a middle value is selected, so that the corresponding standard color card in fig. 1 is used as the color calibration standard.
Correspondingly, the ICC color file generated in fig. 1 is used as a color reduction reference file, the color reduction reference file is called in digital image post-processing software, and mass color reduction processing is performed on appearance shot pictures of objects, so that an image result with relatively high color reduction accuracy is formed.
In an embodiment of the application, by adopting the redundancy color control method, when the cultural relics are copied and stored, redundancy color control shooting and appearance shooting are carried out on the file so as to obtain high-level copied and stored data of the cultural relics.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A method for controlling redundancy color, comprising: the method comprises the following steps:
s1, adopting at least three standard color cards to perform color control shooting on the same article corresponding to the standard color cards of different models respectively, and then canceling the standard color cards to perform appearance shooting on the same article;
s2, establishing a standard color display environment;
s3, utilizing color analysis software matched with the standard color cards to manufacture ICC color files corresponding to the standard color cards; respectively calling ICC color files corresponding to the standard color cards in the digital photo post-processing software to perform color restoration to obtain a photo with restored colors;
s4, analyzing the color value of the photo after color restoration, and calculating the color difference value;
s5, selecting a standard color card corresponding to the color difference value at the middle value as a color correction reference, and taking an ICC color file corresponding to the color correction reference as a color correction reference file;
and S6, importing the photo shot in the appearance into digital photo post-processing software, and referring to a color correction reference file to perform color restoration.
2. The method of claim 1, wherein: in step S1, 3 to 5 color cards are selected according to the redundancy theory, and the brands and specifications of the color cards are different.
3. The method of claim 1, wherein: in step S1, the object to be photographed is fixed and placed in the same time slot, the same work environment, the same light source and the same photographing device, the standard color cards of different models are respectively placed in the same position, that is, the relative positions of the standard color cards and the object to be photographed are fixed, the color control photo shooting is sequentially performed, the standard color cards are cancelled, and the appearance of the object to be photographed is shot.
4. The method of claim 1, wherein: in step S2, under a stable light source environment, a color correction device is used to perform color measurement analysis on the display device and perform corresponding color correction.
5. The method of claim 1, wherein: in step S3, the corrected display device is used to call the ICC files corresponding to the standard color cards in the same digital image post-processing software, and perform color restoration operation on the corresponding color control photos to obtain color-restored photos.
6. The method of claim 5, wherein: in step S4, the method includes the steps of:
a1, respectively selecting a color block on a standard color card in a photo after color restoration in the digital image post-processing software, and respectively reading the number of color values corresponding to the color block in the same color mode;
and A3, respectively calculating the color difference between the color value number of each color block and the corresponding standard color value by using a color difference calculation tool to obtain the color difference value corresponding to each standard color card.
7. The method of claim 1, wherein: in step S5, when 3 standard color cards of different models are used, the color difference value at the middle value is selected, and the standard color card corresponding to the color difference value at the middle value is used as the color correction reference.
8. The method of claim 1, wherein: in step S5, when more than 3 standard color cards of different models are used, the color difference values with large numerical differences are removed, the 3 closest color difference values are selected, the color difference value at the middle numerical value is selected from the 3 closest color difference values, and the standard color card corresponding to the color difference value at the middle numerical value is used as the reference for color correction.
9. The method of claim 1, wherein: in step S6, the outward appearance photographed picture is imported into a color correction reference file, and color restoration batch processing is performed.
10. The method of claim 1, wherein: the article is a cultural relic.
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| US3836246A (en) * | 1971-09-03 | 1974-09-17 | Itek Corp | Image standardizer apparatus |
| JPH01127923A (en) * | 1987-11-12 | 1989-05-19 | Nisshin Somekoujiyou:Kk | Dyeing fastness grade measuring and display device |
| US5633722A (en) * | 1995-06-08 | 1997-05-27 | Wasinger; Eric M. | System for color and shade monitoring of fabrics or garments during processing |
| JPH10319911A (en) * | 1997-05-15 | 1998-12-04 | Matsushita Electric Ind Co Ltd | Led display device and control method therefor |
| JP4623137B2 (en) * | 2008-05-14 | 2011-02-02 | 富士ゼロックス株式会社 | Color processing apparatus, method and program |
| CN103079076B (en) * | 2013-01-22 | 2015-04-08 | 无锡鸿图微电子技术有限公司 | Method and device for generating color calibration matrix of self-adaption gamma calibration curve |
| CN103747247B (en) * | 2014-01-15 | 2016-10-19 | 时空色彩(苏州)信息科技有限公司 | A kind of colour correction card |
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