CN104994376A - Method and system for automatically simulating projection colors of projector - Google Patents
Method and system for automatically simulating projection colors of projector Download PDFInfo
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- CN104994376A CN104994376A CN201510406049.1A CN201510406049A CN104994376A CN 104994376 A CN104994376 A CN 104994376A CN 201510406049 A CN201510406049 A CN 201510406049A CN 104994376 A CN104994376 A CN 104994376A
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Abstract
The invention discloses a method and a system for automatically simulating projection colors of a projector. The method comprises the following steps: A. measuring the gray level performance and the color performance of an image to obtain a brightness curve and a contrast curve; and B. obtaining corrected brightness and contrast according to the brightness curve and the contrast curve. According to the method disclosed by the invention, image collection is carried out on a screen using the projector for projecting to obtain the parameters of the projector, and a final projection result of the projector is simulated on a computer, so that a user can master the onsite projection conditions of the projector at any time and adjust the parameters of the projector according to onsite environments at any time to obtain an optimal projection result, and thus the practicability is high and the market application prospect is brilliant.
Description
Technical field
The present invention relates to colour correction field, particularly relate to a kind of color automatic simulation method and system of projector.
Background technology
The display system of high-resolution, brightness obtains increasing application in the field such as visual, industrial design, Visual Manufacturing, amusement, Military Simulation of scientific algorithm.But due to the impact of several factors, may cause picture colour cast or brightness have problems.At this moment just a system is needed to process the color of picture and brightness etc.
In use projector process, image quality can be caused not good because of following factor:
The reason of the own quality of video source: the color of use exceeds projecting apparatus ability, as supersaturation look etc.; The brightness problem such as chroma-luminance is not enough or excessively bright; Color contrast deficiency or excessive; Colour cast etc.
Projecting apparatus reason: reason is set and causes colour cast, brightness, contrast etc. incorrect; Inherently colour cast; Scarce capacity inherently, as luminance shortage etc.
Projection screen reason: gain is not enough; Contrast scarce capacity, cannot react trickle luminance difference; Local color range there will be quick-fried look; Colour cast.
In addition, same projection project, due to the reason such as hardware, environment, also can cause it different in the drop shadow effect of each occasion, therefore how regulate film according to different environment, make the effect that its arrival one is best, just need a lot of producer to make to on-the-spot participation.Because of ageing equipment problem in projection Project Running Process, drop shadow effect is caused to be affected, and in prior art, do not have a kind of method of color automatic imitation of projector, realize obtaining best drop shadow effect when saving a large amount of manpower and materials.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of color automatic simulation method and system of projector, being intended to solve in prior art regulate during film according to different environment needs a large amount of producer to make to on-the-spot participation, the problem of wasting manpower and material resources.
Technical scheme of the present invention is as follows:
A color automatic simulation method for projector, wherein, comprises the following steps:
A, by carrying out the measurement of expressing gradation and color representation to image, obtain brightness curve and contrast curves;
B, obtain revised brightness and contrast according to brightness curve and contrast curves.
The color automatic simulation method of described projector, wherein, comprises before described steps A:
S, by camera acquires image, and image is divided into three parts: middle white part, for camera focusing and color reference; Color range part, for obtaining brightness value and contrast value; Background parts, for outstanding color range part.
The color automatic simulation method of described projector, wherein, described steps A specifically comprises:
A1, respectively the color range part in image is divided into N number of color range, obtains the brightness value corresponding to each color range and contrast value;
A2, the brightness value of each color range and contrast value to be coupled together respectively, and by least square fitting curve, obtain brightness curve and contrast curves.
The color automatic simulation method of described projector, wherein, described step B specifically comprises:
B1, each color range to be substituted in brightness curve and contrast curves, obtain revised brightness and contrast respectively.
The color automatic simulation method of described projector, wherein, is carrying out in the measurement of expressing gradation and color representation to image, adopt the method for multimetering to obtain average brightness corresponding to each color range and contrast mean value; Described multiple spot comprises 4 points, 5 points, 9 points, one or more in 16.
The color automatic simulation method of described projector, wherein, also comprises image and carries out colour cast judgement.
A color automatic simulation system for projector, wherein, described system comprises:
Measurement module, for the measurement by carrying out expressing gradation and color representation to image, obtain brightness curve and contrast curves;
Correcting module, for obtaining revised brightness and contrast according to brightness curve and contrast curves.
The color automatic simulation system of described projector, wherein, described also system comprises:
Acquisition module, for by camera acquires image, and image is divided into three parts: middle white part, for camera focusing and color reference; Color range part, for obtaining brightness and contrast; Background parts, for outstanding color range part.
Beneficial effect: the present invention discloses a kind of color automatic simulation method and system of projector, it is by carrying out the measurement of expressing gradation and color representation to image, obtain brightness curve and contrast curves, and obtain revised brightness and contrast according to brightness curve and contrast curves.The present invention is by carrying out IMAQ to the screen with projector, obtain the parameter of projecting apparatus, and the final drop shadow effect of simulated projections instrument on computers, make user can grasp the on-the-spot projection situation of projecting apparatus at any time, and carry out proj ector parameters adjustment according to site environment at any time, obtain best drop shadow effect, there is high practicality and market application foreground.
Accompanying drawing explanation
Fig. 1 is the color automatic simulation method flow chart of projector of the present invention.
Fig. 2 is the position view of the color automatic imitation device of projector of the present invention.
Fig. 3 image captured by the present invention is divided into the schematic diagram of white portion, color range part and background parts.
Fig. 4 is the gray scale schematic diagram in expressing gradation of the present invention.
Fig. 5 is the matched curve schematic diagram in expressing gradation of the present invention.
Fig. 6 is the particular flow sheet of step S100 in the color automatic simulation method of projector of the present invention.
Fig. 7 is the particular flow sheet of step S200 in the color automatic simulation method of projector of the present invention.
Embodiment
The invention provides a kind of color automatic simulation method and system of projector, for making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, the invention provides a kind of color automatic simulation method of projector, it comprises the following steps:
S100, by carrying out the measurement of expressing gradation and color representation to image, obtain brightness curve and contrast curves;
S200, obtain revised brightness and contrast according to brightness curve and contrast curves.
In addition, refer to Fig. 2, the embodiment of the present invention is by carrying out IMAQ to the screen with projector, obtain the parameter of projecting apparatus, and the final drop shadow effect of simulated projections instrument on computers, make user can grasp the on-the-spot projection situation of projecting apparatus at any time, and carry out proj ector parameters adjustment according to site environment at any time, obtain best drop shadow effect.
Particularly, the present invention uses collecting device such as qualitative picture such as high definition industry camera or slr camera etc. to gather the image of each projector, and by analysis image, obtain the initial parameter of each projecting apparatus, it comprises: the color representation of expressing gradation and Red Green Blue.Wherein, expressing gradation mainly for be the brightness and contrast aspect of projecting apparatus, the setting of projecting apparatus itself and the service condition of bulb, all can affect the brightness/contrast of projection image, by measuring expressing gradation to adjust the parameter of projecting apparatus or more to change the bulb; And color representation is mainly for the colour cast phenomenon of projected picture, do qualitative analysis for Red Green Blue, the different color effect of projecting apparatus on red, green, blue can be obtained.
First carry out description below to the noun occurred in the present invention: brightness refers to the light levels of picture, its unit is cd/m
2or claim nits; Contrast be then when on screen, same point is the brightest (white) with the darkest time (black) brightness ratio, high contrast means relatively high brightness and presents the gorgeous degree of color, the brightness value of pixel is between 0 to 255, higher near the pixel intensity of 255, lower near the brightness of 0, (brightness)=0.299*R+0.587*G+0.114*B; Pixel is exactly the most base unit of image, and an image may have one or more pixel, more high-order pixel, and the colour table had is also abundanter, more can express the sense of reality of color; Pixel value mostly represents with RGB, and rgb color pattern is a kind of color standard of industrial quarters; And contrast refer to light and shade region in piece image the brightest in vain and the darkest black between the measurement of different brightness level, can contrast be calculated by pixel value.
In the step s 100, by carrying out the measurement of expressing gradation and color representation to image, obtain initial parameter, and initial parameter is analyzed, obtain the calibration parameter to projected image as calculated, it comprises brightness calibration parameter, contrast calibration parameter and three primary colors calibration parameter, can obtain brightness curve and contrast curves further.
Enter subsequently in step S200, namely obtain revised brightness and contrast according to brightness curve and contrast curves.By calibration parameter and revised brightness and contrast, the projector effect under initial parameter and the projector effect after calibration parameter can be simulated on computers, help out to production of film and TV and color correction, also remote guide can be provided to onsite user, the color automatic simulation method of projector of the present invention is simple and easy to realize, and cost of manufacture is low, there is actual application value.
In present pre-ferred embodiments, also need to make reference diagram, particularly, before camera shooting, in order to avoid the impact of light, need to take under the environment of lucifuge.M shelves (manual mode) parameters got to by camera, closes magazine zero offset capability, selects Automatic white balance, evaluates the manual mode parameters such as light measuring function, can take the effect in true environment like this.Wherein, the shooting results invalidity problem that magazine zero offset capability can avoid the automatic process image of camera to cause is closed.The making step of reference diagram is: by camera acquires image, and image is divided into three parts: middle white part, for camera focusing and color reference; Color range part, for obtaining brightness value and contrast value; Background parts, bright-colored, color is many, for outstanding color range part.
Four shootings (obtaining red, green, blue, ash four kinds of color ranges respectively) need be carried out when gathering the image of reference diagram, as shown in Figure 3, (in figure, upper and lower two color ranges are 16 deciles to get the middle white part of image and color range part, and be colored, do not mark color), color range in described color range part is divided into again ash, red, green, blue four kinds of colors, and wherein grey is used for carrying out gray scale measurement to obtain expressing gradation; And red, green, blue look is used for carrying out color measurements to obtain color representation.
Generally first colour cast judgement is carried out to image when carrying out expressing gradation and color representation.The present invention carries out the detection of colour cast image under CIE Lab color space, and the L component wherein in Lab color space is for representing the brightness of pixel, and span is [0,100], represents from black to pure white; A represents the chromaticity range from redness to green, and span is [127 ,-128]; B represents the chromaticity range from yellow to blueness, and span is [127 ,-128].
Preferably, can detect colour cast by the method for equivalent circular in the embodiment of the present invention, its concrete formula is as follows:
Wherein, M, N are the wide height of image, and a, b refer to a-b of CIE Lab space.Da, db are the mean value of a, b chromaticity range respectively.On a-b colorimetric plane, the centre coordinate of equivalent circular is (da, db), and radius is M.The center of equivalent circular is the distance D of (a=0, b=0) to a-b colorimetric plane neutral axis initial point.By the particular location of equivalent circular on a-b colorimetric plane, judge the colour cast of integral image.Da > 0, partially red, otherwise partially green.Db > 0, partially yellow, otherwise partially blue.Introduce colour cast factor K, K value is larger, and colour cast is more serious.A normal picture can be thought when K value is not more than 1.5, certainly generally also can not carry out colour cast judgement.
Carry out the measurement of expressing gradation and color representation in the embodiment of the present invention, particularly, the steps include:
S101, respectively the color range part in image is divided into N number of color range, obtains the brightness value corresponding to each color range and contrast value;
S102, the brightness value of each color range and contrast value to be coupled together respectively, and by least square fitting curve, obtain brightness curve and contrast curves.
Color range is the standard of index (i.e. colo r index) of presentation video brightness power, in Digital Image Processing study course, refers to gray level resolution (being also called grey level resolution or amplitude resolution).Color richness and the fineness of image are determined by color range.By the color range part in image is divided into N number of color range (as the RGB space digital image of 8 looks in present pre-ferred embodiments, its color range is 2^8, namely it has 256 color ranges), each color range is measured as a measuring unit, wherein the numerical value of N is larger, and brightness curve and the contrast curves of acquisition are more accurate.General use 16 rank just can meet the needs of color automatic imitation of the present invention.
In step S101 of the present invention, first color range part is divided into N number of color range, obtains the brightness value corresponding to each color range and contrast value.Consider the color noise impact of camera photographic images, and the local inconsistence problems of on-the-spot light source, need to adopt the mean value getting several pixel values around measurement point to be that measured value (namely gets the pixel value in color range, color range is made up of pixel, pixel value RGB represents), generally can get 9 or 16.In order to shield interference further, the method for multimetering can also be adopted, namely adopting multiple point to carry out measuring to obtain final measured value (average brightness and contrast mean value), as 4 points, 5 points, 9 points, 16 etc.
Carry out subsequently in step S102, the final measured value (brightness value or contrast value) by each color range couples together, and by least square fitting curve, obtains brightness curve and contrast curves.Interval due to final measured value is less than the interval value of real image, and (measured value namely measured is less than the color value of real image; The color value of real image is 0 to 255 scopes, but the measured value obtained after image photographic generally can be less than 0 to 255 these scopes), and the impact such as extraneous factor in test process, make the connecting line of final measured value have some some substantial deviation straight lines close to straight line, therefore by least square fitting curve method, final measured value is revised.
Particularly, described least square method (also known as least squares method) is a kind of mathematical optimization techniques.People are to by a certain variable t or multiple variable t_{1} ... the correlated variables y that t_{n} is formed is interested.Deformation as spring is relevant to power used, and the profit of an enterprise and its turnover, investment return is relevant with original capital.In order to obtain these variablees with the relation between y, just going to build y with uncorrelated variables, using following function model:
, q independent variable or p coefficient go matching.Parameter b is to make selected function model match with measured value y.(as when measuring spring deformation, the coefficient of expansion of power used and spring must be connected).Its target is Selection parameter suitably, the matching measured value making function model best.Generally, measured value is far more than selected parameter.
The problem of next is the quality how judging different matching.The method of gaussian sum Legendre is, supposes that the mean value of measure error is 0.Make the corresponding variable of each measure error and uncorrelated with other measure error (haveing nothing to do at random).People suppose, absolutely not containing systematic error in measure error, they should be pure accidental error (having fixing variance), fluctuate around true value.In addition, measure error meets normal distribution, which ensure that deviate is ignored on last result y.
Determine that the standard of matching should be taken seriously, and carefully select, less power should be endowed compared with the measured value of big error, and set up following rule: by the parameter selected, the quadratic sum of the difference of function curve and the measured value calculated should be made minimum.With function representation be:
Be expressed as with euclidean metric:
The precision of minimization problem, depends on selected function model.
Typical Certain function summary model is linear function model.The simplest linear formula is
, write as matrix form, for
Directly provide the parametric solution of this formula:
Wherein
, be the arithmetic mean of t value.Also following form can be solved:
。
(curve level and smooth in Fig. 5 is matched curve as shown in Figures 4 and 5, the measured curve of curve devious), in present pre-ferred embodiments, when expressing gradation is measured, first get the gray scale test zone (i.e. gray scale) in image, experiment acquisition 4 data points (x, y), wherein the value of x is the color value of original image, and y value is measured value.As: (1,6), (2,5), (3,7), (4,10); Equation is set
, find out and roughly can to meet following system of linear equations
with
:
As far as possible the means that least square method adopts make the variance on equal sign both sides minimum, namely finds out this functional minimum value:
Its minimum value can by right
ask respectively
with
partial derivative, then make them equal zero and obtain, that is:
So just obtain the equation group that is only had two unknown numbers, be easy to just can solve:
= 3 .5
= 1.4
That is straight line y=3.5+1.4x is best.
Similarly, in present pre-ferred embodiments, when color representation is measured, also with above-mentioned same least square fitting curve draw the curvilinear motion of each color range.Particularly, color representation is measured and is divided into again red, green, blue three kinds, and wherein for the method for testing of redness (green, blue method of testing is identical with redness), it also adopts the method for multimetering; In addition due to the reason such as color rendition and projecting apparatus itself of camera, three primary colors in general color representation can not be pure colors, it has certain color error ratio, trichromatic color representation can be obtained by the data of gained after multimetering, the method for aforementioned judgement colour cast can certainly be adopted to judge that three primary colors all there is colour cast phenomenon.Final curve equation (formula type: y=ax^3+bx^2+cx+d, wherein a, b, c, d are coefficients, and x is original value, and y is end value) is obtained with least square fitting curve equally by the data of gained after multimetering.
In addition, the concrete steps of step S200 described in the embodiment of the present invention are: S201, substituted in brightness curve by the pixel value of each color range, obtain revised brightness respectively.Namely according to the brightness curve that above-mentioned least square method draws, best brightness can be calculated, draw the pixel value of last process, generate last image simulation softward window on computers to show, bring great convenience to production of film and TV, field adjustable etc., and embodiment of the present invention is simple and easy to realize, and has high practicality.
Preferably, the present invention also provides a kind of color automatic simulation system of projector, and described in it, system comprises:
Measurement module, for the measurement by carrying out expressing gradation and color representation to image, obtain brightness curve and contrast curves;
Correcting module, for obtaining revised brightness and contrast according to brightness curve and contrast curves.
Further, described also system comprises:
Acquisition module, for by camera acquires image, and image is divided into three parts: middle white part, for camera focusing and color reference; Color range part, for obtaining brightness and contrast; Background parts, for outstanding color range part.
The construction module realization means of the color automatic simulation system of projector of the present invention is consistent with the performing step of said method, does not repeat them here.
In sum, the embodiment of the present invention is by carrying out IMAQ to the screen with projector, obtain the parameter of projecting apparatus, and the final drop shadow effect of simulated projections instrument on computers, make user can grasp the on-the-spot projection situation of projecting apparatus at any time, and carry out proj ector parameters adjustment according to site environment at any time, obtain best drop shadow effect.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (8)
1. a color automatic simulation method for projector, is characterized in that, comprise the following steps:
A, by carrying out the measurement of expressing gradation and color representation to image, obtain brightness curve and contrast curves;
B, obtain revised brightness and contrast according to brightness curve and contrast curves.
2. the color automatic simulation method of projector according to claim 1, is characterized in that, comprise before described steps A:
S, by camera acquires image, and image is divided into three parts: middle white part, for camera focusing and color reference; Color range part, for obtaining brightness value and contrast value; Background parts, for outstanding color range part.
3. the color automatic simulation method of projector according to claim 2, it is characterized in that, described steps A specifically comprises:
A1, respectively the color range part in image is divided into N number of color range, obtains the brightness value corresponding to each color range and contrast value;
A2, the brightness value of each color range and contrast value to be coupled together respectively, and by least square fitting curve, obtain brightness curve and contrast curves.
4. the color automatic simulation method of projector according to claim 3, it is characterized in that, described step B is specially:
B1, each color range to be substituted in brightness curve and contrast curves, obtain revised brightness and contrast respectively.
5. the color automatic simulation method of projector according to claim 3, it is characterized in that, image is being carried out in the measurement of expressing gradation and color representation, adopting the method for multimetering to obtain average brightness corresponding to each color range and contrast mean value; Described multiple spot comprises 4 points, 5 points, 9 points, one or more in 16.
6. the color automatic simulation method of projector according to claim 1, is characterized in that, also comprise image and carry out colour cast judgement.
7. a color automatic simulation system for projector, is characterized in that, described system comprises:
Measurement module, for the measurement by carrying out expressing gradation and color representation to image, obtain brightness curve and contrast curves;
Correcting module, for obtaining revised brightness and contrast according to brightness curve and contrast curves.
8. the color automatic simulation system of projector according to claim 7, is characterized in that, described also system comprises:
Acquisition module, for by camera acquires image, and image is divided into three parts: middle white part, for camera focusing and color reference; Color range part, for obtaining brightness and contrast; Background parts, for outstanding color range part.
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