CN108765502A - A kind of color looks acquisition methods under complex environment - Google Patents
A kind of color looks acquisition methods under complex environment Download PDFInfo
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- CN108765502A CN108765502A CN201810378806.2A CN201810378806A CN108765502A CN 108765502 A CN108765502 A CN 108765502A CN 201810378806 A CN201810378806 A CN 201810378806A CN 108765502 A CN108765502 A CN 108765502A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
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Abstract
The present invention relates to the color looks acquisition methods under a kind of complex environment, including step：S1：Set the change rate of background colour and ambient light to pattern colour looks；S2：Read the tristimulus values of raw observation environment hypograph；S3：By the positive computation model of environmental parameter and tristimulus values input colored quantum noise under original image environment of observation, color looks attribute value is obtained；S4：The backwards calculation model that environmental parameter under the target observations environment of color looks attribute value and reproduction image is inputted to colored quantum noise obtains the tristimulus values of the reproduction image under color background；S5：The backwards calculation model that environmental parameter under the target observations environment of color looks attribute value and reproduction image is inputted to the second colored quantum noise obtains the tristimulus values of the reproduction image under target environment light；S6：According to each tristimulus values, the tristimulus values of the reproduction image under final goal environment of observation is calculated.Compared with prior art, the present invention can take in multiple factors for influencing color looks attribute, and principle is simple, facilitates application.
Description
Technical field
The present invention relates to colors across medium replication and color management field, more particularly, to the color looks under a kind of complex environment
Acquisition methods.
Background technology
It with the rapid development of science and technology and applies, all kinds of colorful digital equipment such as scanner, digital camera, all kinds of displays are set
The promotion of the color-reproducing capability of standby, intelligent mobile terminal equipment, printer, printing machine etc. and the development of internet+technology
Using more extensive across the application of media color reproduction, color reproduction environment is no longer limited to conventional working environment.Due to each
The extensive of class mobile terminal is used, by indoor to open air, the highlighting to noon sun high intensity illumination by darkroom or night scene
Environment is spent, the external environment of color reproduction is all likely to become.Other than normal office environment, other environment have a large amount of display
Screen shows all kinds of coloured image text informations.Such as display of the large screen, outdoor advertisement screen, market on airport for doing propaganda
Screen etc..
Two colors of CIEXYZ values having the same, when being respectively placed under different observation conditions, the vision of people
System can generate it different visual experiences, only when their ambient enviroment, background, stimulation color size, shape, stimulation color
Spectral characteristic and when the completely the same observation conditions such as their illumination, their visual experience just can be consistent.Color science
In field, impression of the vision system to color is described with color looks attribute value.In order to solve environment to the visual experience of color
It influences, International Commission on Illumination (Commission Internationale de l ' Eclairage, CIE) recommends color looks mould
Type CIECAM02.CIECAM02 can be predicted effectively when ambient brightness changes and the lightness of neutral grey background converts
When, the variation range of the variation of caused color looks attribute, predictable ambient brightness is by darkroom to working environment brightness
Variation range.
In all kinds of series products design schemes or other application, it often will appear some images (or color) its background face
Phenomena such as possible different or image size shape of color itself is also variant；Simultaneously, these Series Design products may
Displaying is printed or printed in exhibition booth indoors, it is also possible to indoors be shown on outer large screen, the environment of viewing also has difference
It is different.Often it is original image by wherein a certain image definition, the image under other conditions is fixed for ease of calculating in color science field
Justice is reproduction image, and original image and reproduction image keep visual consistency, are the targets that image reproduction is most asked, colored quantum noise is just
It proposes in order to achieve this goal.
In order to solve the problems, such as that color looks attribute value caused by the factors such as external environmental light, background changes, research work
Persons have carried out a large amount of research, are individually directed to the influence factors such as ambient light, background and CIECAM02 is optimized.But
The color looks computational problem of larger variation has occurred in the factors such as ambient light and background for image simultaneously, almost without researcher
It is proposed effective solution scheme.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide under a kind of complex environment
Color looks acquisition methods.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of color looks acquisition methods under complex environment, include the following steps：
1) change rate of background colour and ambient light to pattern colour looks is set；
2) tristimulus values of original image under raw observation environment is read；
3) tristimulus values of environmental parameter and original image under raw observation environment the positive of colored quantum noise is inputted to calculate
Model obtains color looks attribute value of the original image under raw observation environment；
4) the environmental parameter input first of the target observations environment of the color looks attribute value and reproduction image that obtain step 3)
The backwards calculation model of colored quantum noise obtains the tristimulus values of the reproduction image with same color looks attribute value under color background；
5) environmental parameter under the target observations environment of the color looks attribute value and reproduction image that obtain step 3), which inputs, to be used
In the backwards calculation model of the second colored quantum noise of prediction ambient light variation, obtaining has same color looks attribute under target environment light
The tristimulus values of the reproduction image of value；
6) tristimulus values respectively obtained according to step 4) and step 5) calculates the reproduction figure under final goal environment of observation
Tristimulus values X, Y, Z of picture；
7) tristimulus values for exporting the reproduction image under final goal environment of observation, completes the color looks under target observations environment
It obtains.
Preferably, background colour is set to the change rates of pattern colour looks as 60%, variation of the set environment light to pattern colour looks
Rate is 40%.
Preferably, the expression formula of tristimulus values X, Y, Z of the reproduction image under final goal environment of observation are：
X=0.6X1+0.4X2
Y=0.6Y1+0.4Y2
Z=0.6Z1+0.4Z2
Wherein, X1、Y1、Z1The tristimulus values of reproduction image with same color looks attribute value respectively under color background,
X2、Y2、Z2The tristimulus values of reproduction image with same color looks attribute value respectively under target environment light.
Preferably, the background colour of raw observation environment is neutral ash, and the background colour for reappearing the target observations environment of image is
Colour, and the ambient light of raw observation environment be darkroom to the brightness change of conventional environment, reappear the target observations environment of image
Ambient light include by the brightness change or other brightness change situations of high brightness under darkroom to outdoor noon sun.
Preferably, the environmental parameter under raw observation environment include the relatively bright angle value of background, adapt to field white point tristimulus values,
Adapt to field brightness value and environmental factor.
Preferably, it includes that background tristimulus values, background are relatively bright to reappear the environmental parameter under the target observations environment of image
Angle value adapts to field white point tristimulus values, adapts to field brightness value and environmental factor.
Preferably, the particular content of the step 5) is：
501) ambient light illumination of the target observations environment of reproduction image is obtained；
502) judge ambient light illumination, if ambient light illumination is less than or equal to 1500Lx, select CIECAM02 colored quantum noises
As the second colored quantum noise, otherwise, select the colored quantum noise of the color looks attribute under prediction high-brightness environment as the second color looks mould
Type, calculate high-brightness environment under environmental factor and by the environmental factor being calculated replace the second colored quantum noise in environment because
Son；
503) environmental parameter inputted under the target observations environment of color looks attribute value and reproduction image is selected to step 502)
The second colored quantum noise backwards calculation model, obtain target environment light under with same color looks attribute value reproduction image three
Values.
Preferably, in step 502), predict that the colored quantum noise of the color looks attribute under high-brightness environment is refine-bri
CAM02 colored quantum noises.
Preferably, in step 3), the positive computation model of colored quantum noise is calculated using the positive of CIECAM02 colored quantum noises
Model.
Preferably, in step 4), the backwards calculation model of the first colored quantum noise uses the backwards calculation of CAM97 colored quantum noises
Model.
Compared with prior art, the present invention is varied widely for the ambient light of image with background colour factor simultaneously for the first time
Complicated environment of observation situation, i.e. the background colour of raw observation environment is neutral ash, reappears the back of the body of the target observations environment of image
Scenery is colour, and the ambient light of raw observation environment is brightness change of the darkroom to conventional environment, and the target for reappearing image is seen
The ambient light for examining environment includes by the brightness change or other brightness change situations of high brightness under darkroom to outdoor noon sun
A series of complex environment proposes that the factor to influence color looks attribute is obtained in proportion according to human visual system's feature
Method, wherein the 60% of the variation of setting pattern colour looks attribute is influenced by background variation, remaining 40% variation is by environment
Light variation influences；Based on this, is obtained by corresponding colored quantum noise there was only background color variation and only ambient light variation respectively
The corresponding tristimulus values of Shi Fuxian images, and it is added principle using coloured light, the tristimulus values that two are independently calculated is by setting
Certainty ratio is added, and obtains the tristimulus values for reappearing image under target observations environment, the method for the present invention is only to existing colored quantum noise
Internal calculating parameter slightly adjusts, you can takes in multiple factors for influencing color looks attribute, principle is simple, conveniently answers
With.
Description of the drawings
Fig. 1 is a kind of flow chart of the color looks acquisition methods under complex environment；
Fig. 2 is image and environment of observation schematic diagram in the embodiment of the present invention, wherein Fig. 2 (a) is indoor hard copy, the back of the body
Scenery is neutral grey background, and indoor viewing, ambient light illumination is the original image and its environment of observation schematic diagram of 600Lx；Fig. 2 (b)
It is shown for outdoor display screen, background colour is color background, outdoor viewing, reproduction image and its sight that ambient light illumination is 5000Lx
Examine environment schematic.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present embodiment has carried out the acquisition of color looks for different background color and ambient light and has tested, the image and background colour of selection,
Ambient light includes：
Original image is indoor hard copy, and background colour is neutral grey background, and original image is watched indoors, and ambient light illumination is
600Lx；Reproduction image is that outdoor display screen shows that image, background colour are color background (red, green, Huang and blue four kinds of colors
Background colour, background colour brightness value L=50, chroma value C=50), outdoor viewing, ambient light illumination 7500Lx, such as Fig. 2 (a), figure
Shown in 2 (b).Original image includes the cumulative gray scale color lump of 10 lightness (L=10,20,30,40,50,60,70,80,90,95),
It is red, green, yellow, blue block, brightness value L=20,30,40,50,60, chroma value C=50, totally 120 groups of experiments.
To prove that the validity of the method for the present invention, the present embodiment obtain pair under the conditions of target observations using the method for the present invention
Color is answered, meanwhile, the correspondence color under the conditions of target observations is matched by experiment, then calculates the correspondence color that the method for the present invention obtains
It is that foundation is compared evaluation with aberration with the aberration between the matched corresponding color of subjective experiment.
Color looks acquisition methods under a kind of complex environment proposed by the present invention, as shown in Figure 1, including step in detail below：
S1：Influence of the background and context light to image is calculated separately, it, which stresses ratio, when setting color looks calculate is：Color looks become
60% changed is caused by the variation by background, remaining 40% variation is caused by the variation of ambient light.The shadow of ambient light
It rings and background colour inductive effect is to generate two big principal elements of color looks offset, since human eye vision has the function of chromatic adaptation,
Certain ambient light impact effect is counteracted, therefore for ambient light, the influence of background color induction becomes apparent；According to
Coloured light is added principle, and the tristimulus values of color can be with linear, additive, and based on the above analysis, experimental design demonstrates different
Change rate proportion, the results show, change rate proportion of the invention is optimal.
S2：Read the tristimulus values x, y, z of original image under raw observation environment.
S3：By the environmental parameter of raw observation environment, the i.e. relatively bright angle value of background, adaptation field white point tristimulus values, adaptation
The tristimulus values of field brightness value, environmental factor and original image is counted as input data using the forward direction of CIECAM02 colored quantum noises
Model is calculated, color looks attribute value of the original image under raw observation environment is calculated.
S4：By the environmental parameter of the color looks attribute value of acquisition and the target observations environment for reappearing image, i.e. background tristimulus
Value, the relatively bright angle value of background adapt to field white point tristimulus values, adapt to field brightness value and environmental factor as input data, pass through
The backwards calculation model of CAM97 colored quantum noises calculates three thorns of the reproduction image with same color looks attribute value under color background
Swash value X1、Y1、Z1。
S5：Because ambient light illumination is that 7500Lx is more than 1500Lx, then the anti-of refine-bri CAM02 colored quantum noises is utilized
To computation model, calculating has same color looks category under the environment of observation under 7500Lx high luminance targets environment of observation with original image
Property value reproduction image tristimulus values X2、Y2、Z2.Specific steps include：
501) the ratio S of environment white brightness and the white brightness for stimulating color is obtainedR；
Wherein, LSWIndicate environment white brightness, LDWIndicate the white brightness of stimulation color.
502) computing environment illumination is the environmental factor c, F, N under the high-brightness environment of 7500Lxc；
C=0.023*sqrt (SR)+0.77887
F=-0.003*sqrt (SR)+1.147
Nc=0.0203*sqrt (SR)+1.2369
503) environmental factor being calculated in step 502) is utilized to replace in refine-bri CAM02 colored quantum noises
Environmental factor；
504) the backwards calculation model of refine-bri CAM02 colored quantum noises is utilized to calculate the X under target observations environment2、
Y2、Z2；
S6：Calculate tristimulus values X, Y, Z of the reproduction image under target observations environment：
X=0.6X1+0.4X2；
Y=0.6Y1+0.4Y2；
Z=0.6Z1+0.4Z2
S7：Tristimulus values X, Y, Z of output reproduction image, complete color looks and obtain.
The result of calculation of aberration is as shown in table 1：
Aberration between corresponding color obtained by 1 the method for the present invention of table and the corresponding color of experiment matching
| Average value | Maximum value | Minimum value |
| 4.1 | 12.5 | 2.0 |
As shown in table 1, the average value of aberration is 4.1, according to National Standard of the People's Republic of China's tablet decoration product standard
Middle regulation, the criterion of acceptability with batch homochromy printed matter are：For Fine presswork, the background colour brightness value L of color is more than 50
When, value of chromatism is less than or equal toWhen the L of color is less than or equal to 50, value of chromatism is less than or equal toFor general
Printed matter, when the L of color is more than 50, value of chromatism is less than or equal toWhen the L of color is less than or equal to 50, value of chromatism is small
In equal toUsing this standard as foundation, method provided by the invention is effective.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The staff for being familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain subject to.
Claims (9)
1. the color looks acquisition methods under a kind of complex environment, which is characterized in that include the following steps：
S1：Set the change rate of background colour and ambient light to pattern colour looks；
S2：Read the tristimulus values of original image under raw observation environment；
S3：The tristimulus values of environmental parameter and original image under raw observation environment is inputted into the positive of colored quantum noise and calculates mould
Type obtains color looks attribute value of the original image under raw observation environment；
S4：The environmental parameter of the step S3 color looks attribute values obtained and the target observations environment for reappearing image is inputted into the first color looks
The backwards calculation model of model obtains the tristimulus values of the reproduction image with same color looks attribute value under color background；
S5：By the environmental parameter input under the target observations environment of the step S3 color looks attribute values obtained and reproduction image for pre-
The backwards calculation model of the second colored quantum noise of ambient light variation is surveyed, obtaining has same color under the ambient light of target observations environment
The tristimulus values of the reproduction image of looks attribute value；
S6：According to the tristimulus values that step S4 and S5 are respectively obtained, three of the reproduction image under final goal environment of observation are calculated
Values X, Y, Z；
S7：The tristimulus values of the reproduction image under final goal environment of observation is exported, the color looks completed under target observations environment obtain
It takes.
2. the color looks acquisition methods under a kind of complex environment according to claim 1, which is characterized in that setting background colour pair
The change rate of pattern colour looks is 60%, and set environment light is 40% to the change rate of pattern colour looks.
3. the color looks acquisition methods under a kind of complex environment according to claim 2, which is characterized in that the step S6
In, the expression formula of tristimulus values X, Y, Z of the reproduction image under final goal environment of observation are：
X=0.6X1+0.4X2
Y=0.6Y1+0.4Y2
Z=0.6Z1+0.4Z2
Wherein, X1、Y1、Z1The tristimulus values of reproduction image with same color looks attribute value, X respectively under color background2、Y2、
Z2The tristimulus values of reproduction image with same color looks attribute value respectively under target environment light.
4. the color looks acquisition methods under a kind of complex environment according to claim 1, which is characterized in that the original sight
Examine the environmental parameter under environment include the relatively bright angle value of background, adapt to field white point tristimulus values, adapt to field brightness value and environment because
Son.
5. the color looks acquisition methods under a kind of complex environment according to claim 1, which is characterized in that the reproduction figure
Environmental parameter under the target observations environment of picture includes background tristimulus values, the relatively bright angle value of background, adapts to field white point tristimulus
Value adapts to field brightness value and environmental factor.
6. the color looks acquisition methods under a kind of complex environment according to claim 1, which is characterized in that the step S5
Particular content be：
501) ambient light illumination of the target observations environment of reproduction image is obtained；
502) judge ambient light illumination, if ambient light illumination is less than or equal to 1500Lx, select CIECAM02 colored quantum noise conducts
Otherwise second colored quantum noise selects the colored quantum noise of the color looks attribute under prediction high-brightness environment as the second colored quantum noise, meter
It calculates the environmental factor under high-brightness environment and the environmental factor being calculated is replaced into the environmental factor in the second colored quantum noise；
503) input color looks attribute value and reappear selected by environmental parameter to the step 502) under the target observations environment of image the
The backwards calculation model of two colored quantum noises obtains the tristimulus of the reproduction image with same color looks attribute value under target environment light
Value.
7. the color looks acquisition methods under a kind of complex environment according to claim 6, which is characterized in that the step
502) in, predict that the colored quantum noise of the color looks attribute under high-brightness environment is refine-bri CAM02 colored quantum noises.
8. the color looks acquisition methods under a kind of complex environment according to claim 1, which is characterized in that the step S3
In, the positive computation model of colored quantum noise uses the positive computation model of CIECAM02 colored quantum noises.
9. the color looks acquisition methods under a kind of complex environment according to claim 1, which is characterized in that the step S4
In, the backwards calculation model of the first colored quantum noise uses the backwards calculation model of CAM97 colored quantum noises.
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Cited By (1)
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| CN114397094A (en) * | 2022-01-26 | 2022-04-26 | 武汉大学 | Light source color rendering evaluation method based on spectral reconstruction and color appearance model |
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