CN105303527B - A kind of image recovery method of photobleaching spray graphic art product - Google Patents
A kind of image recovery method of photobleaching spray graphic art product Download PDFInfo
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- CN105303527B CN105303527B CN201510597432.XA CN201510597432A CN105303527B CN 105303527 B CN105303527 B CN 105303527B CN 201510597432 A CN201510597432 A CN 201510597432A CN 105303527 B CN105303527 B CN 105303527B
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Abstract
The invention provides a kind of image recovery method of photobleaching spray graphic art product, comprise the following steps：Step 1：Make the spray graphic art product that do not fade；Step 2：The colour fading process of spray graphic art product is simulated with the UV light irradiation spray graphic arts product of light box；Step 3：At regular intervals with color measurement instrument measurement standard color table and tristimulus values, the L of paper*a*b*Value and spectral reflectivity；Step 4：The L obtained according to step 3 measurement*a*b*Value, with a*It is worth for x-axis, b*It is worth and draws a for y-axis*b*Gamut map, analyze the colour gamut map analysis color change trend of drafting；Step 5：Colour fading spray graphic art product electronic record is obtained by way of scanning；Step 6：The colour fading rule drawn according to step 5, using graph and image processing software, image repair is carried out to the colour fading spray graphic art product electronic record that step 5 obtains.The present invention realizes the Virtual restora- tion of the color painting art work, substantially increases the levels of precision of color recovery.
Description
Technical field
The invention belongs to computer virtual to restore field, specially a kind of image restoration side of photobleaching spray graphic art product
Method.
Background technology
The color painting art work has important value, in order to more preferable as a kind of information carrier in terms of artistic study
Preservation, its reparation also just becomes even more important.Using computer technology color artistic product are carried out with virtual repair gradually to substitute
Traditional manual restoration method, it is that weathered image is virtually repaired using computer graphic image technology,
The risk of recovery operation is assessed by such repair process, this mode will not destroy historical relic and efficiency high, can
It is repeated strong.The colour fading rule of usual spray graphic art product is not absolute, can be produced because of used material, the different of storage environment
Different degrees of colour fading, but in existing technology, the color reparation specific aim for colour fading spray graphic art product is not strong, can not
Specific reparation is carried out to specific colour fading feature, causes the result of reparation not ideal enough.Method proposed by the present invention utilizes UV light
According to simulation color spray graphic art product photobleaching process, the color character of monitoring image changes, and data regression is utilized according to change
With curve-fitting method analyze data, color painting art work photobleaching rule is obtained, is reversely deduced according to colour fading rule
Image after to reparation.It is more multiple that method proposed by the present invention can obtain the color in the color painting art work
It is former.
The content of the invention
For the problems of in the prior art, it is an object of the invention to provide a kind of photobleaching spray graphic art product
Image recovery method, this method can simulate the colour fading process of photobleaching spray graphic art product, so as to draw colour fading rule, according to
This rule reversely deduces the image after being repaired, and makes the color in the color painting art work obtain more accurately restoring.
The technical solution adopted for the present invention to solve the technical problems comprises the following steps
Step 1. makes the spray graphic art product that do not fade
Color artistic image and the color version print characteristics input data of picture and text technology-four-expansion are faced according to using paper web
Fill data acquisition system IT8.7/4 and carry out typesetting design.Wherein IT8.7/4 must select special color corresponding to specific spectral photometric colour measuring instrument
Table.Spray graphic art product are made with the color inkjet printer of corresponding breadth, paper, ink and other ink jet printings used during making
Condition is consistent with the spray graphic art product to fade, obtains as colour fading spray graphic art product.
Step 2. simulates spray graphic art product photobleaching process
After step 1 gained spray graphic art product are completely dried, place it under light box, it is UV to select lighting source
Light carries out long-time uniform irradiation to spray graphic art product, and the humiture of surrounding environment is protected with the placement environment of colour fading spray graphic art product
Hold consistent, the colour fading process of simulation spray graphic art product.
Step 3. is monitored to the data of colour fading process
At regular intervals using all color lumps and paper on professional spectral photometric colour measuring instrument measurement IT8.7/4 standard color tables
Tristimulus values, L*a*b*Value and spectral reflectivity, and measurement result is preserved into Microsoft Excel electrical forms.
Step 4. data analysis draws colour fading rule
The L obtained according to step 3 measurement*a*b*Value, using business arithmatic software Matlab with a*It is worth for abscissa, b*It is worth and is
Ordinate draws a* b*Gamut map, analyze the colour gamut map analysis color change trend of drafting：
4-1. starts computer and opens business arithmatic software Matlab, then opens and run the gamut map that compiling is completed
Drawing program.
4-2. measures acquired results every time according to software command prompt successively load step 3, select data area for
L、 a* 、b*Three column datas.
4-3. draws each Monitoring Data a using scatter () function* b*Gamut map, and drawing result is exported to finger
Determine file；
All a that 4-4. is obtained by analyzing 4-3* b*The tendencies toward shrinkage of gamut map obtains the direction of color change.According to
Analysis result chooses the representative color lump in IT8.7/4 standard color tables and exports all L corresponding to each color lump*a*b*Value
4-5. is using business arithmatic software Matlab to selecting each group of data L of each color lump in the 4th step*a*b*Value changes
Carry out curve fitting, obtain colour fading rule.
Step 5. digitizes colour fading spray graphic art product
The spray graphic art product after colour fading are scanned using the professional color scanner of corresponding paper breadth, and obtains and takes off
Color spray graphic art product electronic record.
Step 6. repairs image using graph and image processing
The colour fading rule drawn according to step 4, replaced using the color in professional graphic image processing software Photoshop
Instrument, color replacement is carried out to the colour fading spray graphic art product electronic record that step 6 obtains, image is repaired.
The benefit and effect of the present invention is as follows：
（1）The problem of present invention exists for the colour fading of the current color painting art work, propose color with physical simulation experiment
The photobleaching process of color spray graphic art product, the chromatic value of characteristic color block in change procedure is carried out based on color science theory
Monitoring, carries out analyzing and processing to the feature color lump color value during colour fading and draws colour fading rule, more targetedly and practical
Property.
（2）There is the problem of specific aim difference in the present invention, solve and restrict color painting skill in being restored for computer virtual
The unfixed key issue of colour fading rule in art product recuperation, the image substantially increased for different photobleaching processes are answered
Proper energy power, improve the recovery effect of the color painting art work.
Brief description of the drawings
Fig. 1 is a kind of flow of the image recovery method of photobleaching spray graphic art product in the specific embodiment of the invention
Figure；
Fig. 2 is to obtain the flow chart of photobleaching rule in the specific embodiment of the invention.
Embodiment
With reference to Figure of description, the present invention will be further described：
As described in Figure 1, the present embodiment comprises the following steps：
Step 1. makes the spray graphic art product that do not fade
Color artistic image and the color version print characteristics input data of picture and text technology-four-expansion are faced according to using paper web
Fill data acquisition system IT8.7/4 and carry out typesetting design.Corresponding to the wherein IT8.7/4Rondom love beautiful i1iSis spectrophotometers of color specially
Use color table.Spray graphic art product are made with the color inkjet printer of corresponding breadth, paper, ink and other ink-jets used during making
Printing condition is consistent with the spray graphic art product to fade, obtains as colour fading spray graphic art product.
Step 2. simulates spray graphic art product photobleaching process
After step 1 gained spray graphic art product are completely dried, IT8.7/4 Rondom standard color tables are divided with i1isis
Photometer is measured and preserves measurement result first, is then placed it under light box, is opened light box selection and is shone
Mingguang City source is UV light, and spray graphic art product are carried out with long-time uniform irradiation, humiture and the colour fading spray graphic art product of surrounding environment
Placement environment be consistent, simulate spray graphic art product colour fading process.
Step 3. is monitored to the data of colour fading process
Use three of all color lumps and paper on professional spectral photometric colour measuring instrument measurement IT8.7/4 Random standard color tables
Values, L*a*b*Value and spectral reflectivity, and measurement result is preserved into Microsoft Excel electrical forms.Respectively with
It is interval measurement 5 times within 2 hours, was interval measurement 5 times with 3 hours, was interval measurement 5 times with 4 hours, obtains 15 groups of data.
Step 4. data analysis draws colour fading rule
Obtained data totally 16 groups of L are measured according to step 2 and step 3*a*b*Value, using business arithmatic software Matlab with
a*It is worth for abscissa, b*It is worth and draws a for ordinate* b*Gamut map, gamut map totally 16, is drawn with different colours respectively, and
Group corresponding to each color is marked in figure.Analyze the colour gamut map analysis color change trend drawn, detailed process such as Fig. 2 institutes
Show：
4-1. starts computer and opens business arithmatic software Matlab, then opens and run the gamut map that compiling is completed
Drawing program.
4-2. measures 16 groups of data of gained, every group of choosing according to software command prompt successively load step 2 and step 3
It is L, a to select data area* 、b*Three column datas.
4-3. draws each Monitoring Data a using scatter () function* b*Gamut map, and drawing result is exported to finger
Determine file；
All a that 4-4. is obtained by analyzing 4-3* b*The direction that the tendencies toward shrinkage of gamut map obtains color change is red
It is obvious with blue portion color change, and yellow and green portion change unobvious.IT8.7/4 standards are chosen according to analysis result
Representative color lump in color table simultaneously exports all L corresponding to each color lump*a*b*Value.
4-5. is using business arithmatic software Matlab to selecting each group of data L of each color lump in the 4th step*a*b*Value changes
Carried out curve fitting with polyfit () function, respectively obtain L*、a*、b*The function that value changes over time is so as to obtaining corresponding face
The colour fading rule of color.
Step 5. digitizes colour fading spray graphic art product
The spray graphic art image after colour fading is scanned using FineScan2750 falt bed scanners, and obtains colour fading
Spray graphic art image electronic archives.
Step 6. repairs image using graph and image processing
The colour fading rule drawn according to step 4, reversely solve the chromatic value L before fading*a*b*, utilize professional graphic image
Select tools and color replacement tool in processing softwares of Photoshop choose the colour fading spray graphic art product electronics that step 6 obtains
Colour fading color in archives simultaneously carries out color replacement, and image is repaired.
Instant invention overcomes the problem that specific aim is poor, recovery effect is undesirable in conventional computer virtual recuperation,
On the basis of UV lighting simulation color painting taking off of the art work, the color character change of monitoring image, number is utilized according to change
According to returning and curve-fitting method analyze data, color painting art work color fading rule under specified conditions is obtained, according to taking off
Color rule reversely deduces the image after being repaired.The Virtual restora- tion of the color painting art work is targetedly realized, significantly
Improve the levels of precision of color recovery.
Claims (5)
1. a kind of image recovery method of photobleaching spray graphic art product, it is characterised in that comprise the following steps：
Step 1：The air brushing condition for simulating photobleaching spray graphic art product makes the color painting art work, including a width coloured image
With IT8.7/4 standard colour codes；
Step 2：The photobleaching process of spray graphic art product is simulated with the UV light irradiation spray graphic arts product of light box；
Step 3：The color of the monitoring color painting art work takes off change process, i.e., measures IT8.7/ with color measurement instrument at regular intervals
4 and tristimulus values, the L of paper*a*b*Value and spectral reflectivity；
Step 4：The L obtained according to step 3 measurement*a*b*Value, draw and analyze ab gamut maps and obtain color and take off change trend, select
Representative color lump and its lab values in IT8.7/4, the data of selection are carried out curve fitting using Matlab program softwares, obtained
The colour fading rule of the color painting art work；
Step 5：Colour fading spray graphic art product electronic record is obtained by way of scanning；
Step 6：The colour fading rule drawn according to step 4, using the color replacement tool in Photoshop softwares, sprayed to fading
Paint the art work and carry out color replacement, image is repaired.
A kind of 2. image recovery method of photobleaching spray graphic art product as described in claim 1, it is characterised in that step 2
Described in the simulation of colour fading process be in closed light box, carried out in a manner of UV light uniform irradiations.
A kind of 3. image recovery method of photobleaching spray graphic art product as described in claim 1, it is characterised in that step 3
Described in the monitoring of colour fading process be that assorted block number is factually applied in IT8.7/4 standards colour code at regular intervals by measuring
's.
A kind of 4. image recovery method of photobleaching spray graphic art product as described in claim 1, it is characterised in that step 4
Described in the acquisition of colour fading rule comprise the following steps：
It is to utilize the scatter functions in Matlab program softwares to draw ab gamut maps and analyze ab colors that 4-1 colors, which take off change trend,
Domain figure obtains：
It is then to take off change trend using obtained color to select representative color lump that 4-2 colors, which take off change rule, analyzes representative color lump
Color value changes, obtain color using the mode of curve matching in Matlab and take off change equation.
A kind of 5. image recovery method of photobleaching spray graphic art product as described in claim 1, it is characterised in that step 6
In image restoration be by colour fading rule solve color change value, using in professional graphic image processing software Photoshop
Color replacement tool according to changing value Contrary compensation fade after spray graphic art product.
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| CN105843138B (en) * | 2016-03-16 | 2018-04-27 | 杭州万事利丝绸数码印花有限公司 | A kind of digit printing color reproduction monitoring method |
| CN107798666B (en) * | 2017-11-17 | 2021-08-10 | 上海大学 | Old film fading and flickering restoration method based on sparse color characteristics |
| CN112270723A (en) * | 2020-10-26 | 2021-01-26 | 齐齐哈尔大学 | Drawing art digital extraction color restoration method |
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| FR2841357B1 (en) * | 2002-06-24 | 2004-08-27 | Eastman Kodak Co | METHOD FOR THE SPATIAL RESTORATION OF THE COLORS OF AN IMAGE |
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| CN1259688A (en) * | 1998-12-14 | 2000-07-12 | 伊士曼柯达公司 | Automatic renewing photographs |
| CN101529245A (en) * | 2006-10-26 | 2009-09-09 | 西巴控股有限公司 | Light absorbing layer for photo-chromic systems |
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