CN104091025B - Smoking effect reality sense simulation method - Google Patents
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- CN104091025B CN104091025B CN201410331612.9A CN201410331612A CN104091025B CN 104091025 B CN104091025 B CN 104091025B CN 201410331612 A CN201410331612 A CN 201410331612A CN 104091025 B CN104091025 B CN 104091025B
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004088 simulation Methods 0.000 title abstract description 22
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Abstract
The invention discloses a smoking effect reality sense simulation method. The method includes the steps that first, a smoking area is selected in an HSV image, and the brightness decay factor of any point in the smoking area is the product of a horizontal direction brightness decay factor and a vertical direction brightness decay factor; second, the brightness of the smoking area is changed by interactively adjusting the value of the horizontal direction brightness decay factor and the value of the vertical direction brightness decay factor; third, whether the brightness of the smoking area achieves the expected smoking effect or not is judged, it yes, operations are stopped, and if not, the operations from the first step to the third step are performed on the smoking area again till the smoking effect is achieved. According to the method, the smoking effect is simulated by decaying the brightness in the HSV color space, the whole smoking process from the brand new state to the thorough sooting effect can be represented when the brightness decays from the original value to 0, the smoking distribution and the smoking intensity can be interactively adjusted in the two orthogonal directions including the horizontal direction and the vertical direction, the expected smoking effect can be generated through simple and effective adjustment, and the sense of reality is strong.
Description
Technical field
The present invention relates to technical field of image processing, particularly to sootiness effect sense of reality analogy method.
Background technology
The simulation of sootiness effect sense of reality be a kind of technology based on computer disposal image so as to present due to making a fire,
The sootiness effect that the many reasons such as light a lamp, go to temple to pray, burning lead to, can be simulated to arts work such as mural painting, oil paintings, in art
The fields such as the virtual reparation of product, digital art creation have important theoretical research and actual application value.
At present, the simulation of sootiness effect sense of reality mainly includes following two methods (with to mural painting sootiness effect sense of reality mould
It is intended to be example)：
First method be using the image softwares such as PhotoShop carry out sootiness effect sense of reality simulation, its core be
One layer of sootiness figure layer is covered on the figure layer of normal picture.Basic procedure：First, select sootiness region；Then, newly-built figure layer 1, if
Putting foreground is Lycoperdon polymorphum Vitt, and setting suitable " Feather Radius " is sprouted wings, and makes transition inside and outside sootiness region natural, simultaneously in figure layer
In panel, " mixed model " is set to " color burn ", according to circumstances adjusts opacity；Subsequently, duplicate layer 1 is as figure
Layer 2, " mixed model " is set to " bottom folded by positive ", according to circumstances arranges opacity；Finally, select " the figure in menu
Picture>Adjustment>Form and aspect/saturation ", are adjusted simulating sootiness effect as needed.
Second method is to carry out the simulation of sootiness figure trace using fire disaster simulation software, and its core is that simulated fire occurred
Journey, intercepts the image in sootiness region from scene after terminating.The most frequently used fire disaster simulation software is FDS (Fire Dynamics
Simulator, fire kinetic-simulator), basic procedure：First, conflagration area size is set, places construction material and indoor thing
Product；Then, point of origin is set, starts fire disaster simulation；Finally, fire disaster simulation is stopped according to combustion case, intercept desired zone
Sootiness vestige.
But above two method carries out sootiness effect simulation all existing defects, specific as follows：
(1) limited by the scope of application：First method lacks theoretical basiss, only has application in terms of virtual sootiness adornment at present,
But sootiness mural painting is with sootiness adornment and incomplete same, so cannot reflect that smoke particle is attached to wall painting surface using the method
The true effect presenting afterwards.Although second method is set up on smog movement and attachment theoretical basiss, generate
Sootiness mural painting is to suffer from fire to intercept, after destroying, the result that sootiness vestige obtains again in mural painting, and fire is neither the master of sootiness mural painting
Want the origin cause of formation, and be not unique origin cause of formation, sootiness mural painting the origin cause of formation such as is also gone to temple to pray except fire, carries out sootiness simulation in this way
The suitability is extremely limited.
(2) do not meet truth：The sootiness region that first method generates is completed by feathering operation, leads to its sootiness
Intensity gradually weakens from center to edge, but under practical situation, the sootiness intensity distributions in sootiness region are simultaneously irregular, therefore, the party
Method cannot accurately describe the sootiness intensity distributions under practical situation it is impossible to obtain the sootiness effect having compared with high realism.Second
The method of kind is generally used for fire disaster simulation and genetic analysis, represents that smog divides using from indigo plant to red continuous color in simulation process
Cloth is strong and weak, and the generation result of the method is the cigarette trace for describing crock distribution characteristicss, is substantially in fire disaster simulation scene
Individual section, its surface color and polish is also the subset from indigo plant to red continuous color, and therefore, the color that the method generates result does not meet cigarette
The real conditions of smoked mural painting.
(3) operating process is loaded down with trivial details and is difficult to grasp：Both approaches are required for arranging quantity of parameters, and between parameter also
There is many associations, second method also needs to according to practical situation design and builds scene of fire, operates comparatively laborious,
Need operator to possess certain experience and skill, be difficult to grasp.
In sum, prior art carries out there is sense of reality poor lacking during sootiness effect simulation to arts work such as mural paintings
Fall into.
Content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention is how to improve the sense of reality of sootiness effect simulation.
(2) technical scheme
For solving above-mentioned technical problem, the invention provides sootiness effect sense of reality analogy method, including：
S1, in HSV image select sootiness region, in described sootiness region the brightness decay factor of any point be level side
Product to the brightness decay factor and the vertical direction brightness decay factor；
S2, by the value of the interactive adjustment horizontal direction brightness decay factor and the vertical direction brightness decay factor to change
State the brightness in sootiness region；
S3, judging whether the brightness in sootiness region reaches expected sootiness effect, if reached, stopping, otherwise to described
The operation of sootiness region repeat step S1～S3, till reaching.
Optionally, also include before described step S1：
Image is converted to the array in hsv color space in the array of RGB color, obtains HSV image.
Optionally, also include before described step S2：
The initialization horizontal direction brightness decay factor and the vertical direction brightness decay factor are so as to value at any point is equal
For 1, corresponding horizontal direction brightness decay adjustment curve and vertical direction brightness decay adjustment curve are straight line.
Optionally, in described sootiness region after described step S2 any point (x, y) brightness V'(x, y)=V (x, y)
× HBVal (h) × VBVal (v), wherein x and y represent abscissa and vertical coordinate respectively, and V (x, y) is sootiness area before step S2
The brightness in domain any point (x, y), HBVal (h) is value at h for the horizontal direction brightness decay factor, and h is that described horizontal direction is bright
Abscissa with (x, y) corresponding point on degree Attenuation adjustable curve, VBVal (v) is the vertical direction brightness decay factor at v
Value, v is the abscissa on described vertical direction brightness decay adjustment curve with (x, y) corresponding point.
Optionally, described horizontal direction brightness decay adjustment curve and described vertical direction brightness decay adjustment curve are
Bezier.
Optionally, described Bezier is 3 Beziers, and function expression is：
B (t)=P0(1-t)3+3P1t(1-t)2+3P2t2(1-t)+P3t3, t ∈ [0,1], wherein B (t) are data point, P0、
P1、P2、P3For 4 control point on described Bezier.
Optionally, described sootiness region be shaped as rectangle.
Optionally, after described step S2, also include before step S3：
Set up described horizontal direction brightness decay adjustment curve, described vertical direction brightness decay adjustment curve and described cigarette
The corresponding relation in smoked region；
The upper left corner in described sootiness region, bottom right angular coordinate are (Left, Top), (Right, Bottom) respectively, described water
Square to brightness decay adjustment curve abscissa scope be [Hmin,Hmax], then described horizontal direction brightness decay adjustment curve
Upper any point h ∈ [Hmin,Hmax] in described sootiness region line correspondenceDescribed perpendicular
Nogata is [V to brightness decay adjustment curve abscissa scopemin,Vmax], then on described vertical direction brightness decay adjustment curve
Any point v ∈ [Vmin,Vmax] in described sootiness region line correspondence
Optionally, the irregular figure of the generally circular in shape or closing in described sootiness region.
(3) beneficial effect
Sootiness effect sense of reality analogy method provided in an embodiment of the present invention, declines using to brightness in hsv color space
Subtract to simulate sootiness effect so that the brightness of HSV image decays to 0 from original value and just can show from brand-new to thorough sooting
Whole smoking process, and using the horizontally and vertically distribution of two orthogonal direction interactive adjustment sootiness and power, can be by simple
Effectively sootiness effect expected from regulative mode generation, sense of reality is stronger, and control method simply it is easy to operation, is easy to repair simultaneously
Change, there is repeatability.
Brief description
Fig. 1 is the flow chart of steps of the sootiness effect sense of reality analogy method providing in the embodiment of the present invention；
Fig. 2 is the initialized schematic diagram of horizontal direction brightness decay adjustment curve in the embodiment of the present invention；
Fig. 3 is the initialized schematic diagram of vertical direction brightness decay adjustment curve in the embodiment of the present invention；
Fig. 4 is the schematic diagram of horizontal direction brightness decay adjustment curve after regulation in the embodiment of the present invention；
Fig. 5 is the schematic diagram of vertical direction brightness decay adjustment curve after regulation in the embodiment of the present invention；
Fig. 6 is present invention flow chart so that mural painting is carried out with the simulation of sootiness effect sense of reality as a example.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Hereinafter implement
Example is used for the present invention is described, but is not limited to the scope of the present invention.
The art work () suffers from the destructive process of sootiness taking mural painting as a example, is the mistake that smoke particle constantly adheres in wall painting surface
Journey.From color characteristics, wall painting pigment reflection and its color identical light, so human eye can experience the abundant of mural painting color
Property, but black smoke particle absorbs the light of shades of colour.So, for the grid of any pixel of mural painting image place, with cigarette
The increase of mist granule adhesion amount, the light (energy) that it reflects gradually weakens, due to not introducing other colors, so reflection
Color category be not changed in, but brightness is gradually lowered.Therefore, in hsv color space, the relatively normal mural painting of sootiness mural painting
For, it is considered as tone H and saturation S does not change, brightness V occurs the result of decay.For mural painting image, keep
H and S of each pixel is constant, and V is gradually lowered to 0, can show the cigarette by brand-new state to thorough sooting for the mural painting well
Smoked overall process.It follows that the simulation of sootiness mural painting sense of reality is carried out according to hsv color Space Theory, there is the preferable suitability.
Based on above-mentioned principle, the invention provides sootiness effect sense of reality analogy method, steps flow chart is as shown in figure 1, have
Body comprises the following steps：
Step S1, in HSV image select sootiness region, in sootiness region the brightness decay factor of any point be level side
Product to the brightness decay factor and the vertical direction brightness decay factor.
Step 2, changed by the value of the interactive adjustment horizontal direction brightness decay factor and the vertical direction brightness decay factor
Become the brightness in sootiness region.
Step S3, judging whether the brightness in sootiness region reaches expected sootiness effect, if reached, stopping, otherwise right
The operation of sootiness region repeat step S1～S3, till reaching.
Above-mentioned steps can be to selected sootiness region, by two orthogonal direction brightness decay adjustment curves of interactive adjustment
Shape, thus adjusting the value of the brightness decay factor on correspondence direction.Comprehensive use level direction brightness decay factor and vertically
Direction brightness decay factor, can adjust the brightness of any point in two-dimentional HSV image, be achieved in sootiness effect.
Optionally, also include before step S1 in the present embodiment：Image is converted to HSV in the array of RGB color
The array of color space, obtains HSV image.
Hsv color space is a kind of user oriented color model, and tone H (Hue) therein represents color information, i.e. institute
The position of the spectral color at place, this parameter is represented with angular metric, and span is 0 °～360 °, starts by counterclockwise from redness
Direction calculating, redness is 0 °, green is 120 °, blueness is 240 °；Their complementary color is：Yellow is 60 °, cyan is 180 °, product
Red is 300 °；Saturation S (Saturation) represents the purity of color, scope from 0 to 1, it be expressed as selected color purity and
Ratio between this color maximum purity, during S=0, only gray scale, during S=1, purity highest；Brightness V (Value) represents color
Light levels, scope is from 0 (black) to 1 (white).Array P preserves image PicorigIn the data of RGB color, this number
Group element Pi,jIt is the structure that length is 3, preserve image PicorigIn the rgb value at point (i, j) place, that is,：Pi,j={ Ri,j,Gi,j,
Bi,j, i=1 ... ..., M, j=1 ... ..., N, wherein Ri,j、Gi,j、Bi,jIt is respectively the redness at point (i, j) place for the image pixel value
Component, green component and blue component.
If Ri,j,Gi,j,Bi,jIn maximum, minima be respectively MaxPi,jAnd MinPi,j, according to formula 1 by Pi,jConversion
Data Q for hsv color spacei,j={ Hi,j,Si,j,Vi,j}：
Wherein Hi,j、Si,j、Vi,jThe respectively tone of image, saturation and brightness, i=1 ... ..., M, j=1 ... ..., N,
M and N is respectively the image-region size with vertical direction in the horizontal direction.
Optionally, also include before step S2：
The initialization horizontal direction brightness decay factor and the vertical direction brightness decay factor are so as to value at any point is equal
For 1, corresponding horizontal direction brightness decay adjustment curve and vertical direction brightness decay adjustment curve are straight line, that is, before adjusting
Article two, brightness decay adjustment curve is all in the horizontal linear of the top, as shown in Figures 2 and 3, now HSV image is not done
Any decay.Wherein Fig. 2 is the initialized schematic diagram of horizontal direction brightness decay adjustment curve, and abscissa is represented with h, vertical coordinate
Represent horizontal direction brightness decay factor HBVal (h), size is at the beginning of vertical direction brightness decay adjustment curve from 0～1, Fig. 3
The schematic diagram of beginningization, abscissa is represented with v, and vertical coordinate represents horizontal direction brightness decay factor Ⅴ BVal (v), and size is from 0～1.
Optionally, the horizontal direction brightness decay adjustment curve in the present embodiment and vertical direction brightness decay adjustment curve
It is Bezier.Bezier is made up of with node line segment, and node is the fulcrum that can drag, and line segment is as telescopic skin
Muscle.Bezier is considerable parameter curve in computer graphicss, and the pen tool in drawing tool software is general
For making Bezier.
In sootiness simulation process, the brightness how changing pending image all pixels point effectively in real time is the present invention
Key, therefore the present invention adopt orthogonal interactive adjustment method.Because Bezier is easy to adjustment, interactivity by force, so this
The brightness decay adjustment curve on horizontally and vertically direction is represented respectively using two Beziers, using two in embodiment
Bezier interacts, thus realizing more accurate brightness regulation, improves the sense of reality of sootiness effect simulation.
The brightness decay factor of any for normal picture pixel is considered as horizontally and vertically on two orthogonal directions the method
The product of the brightness decay factor, just can be controlled by the brightness decay factor in interactive adjustment horizontally and vertically two orthogonal directions
The brightness decay factor of entire image processed, thus complicated two-dimensional brightness decay factor interactive adjustment is converted to simply one-dimensional
Brightness decay factor interactive adjustment；During the often regulation of the one-dimensional brightness decay factor, by the way of pulling adjustment curve
Change the brightness decay factor.Sootiness effect directly can be produced on normal picture using orthogonal interactive adjustment method, speed is relatively
Hurry up；And it is easy to modification, vision smoothness, the sootiness effect of requirement can be met.
Optionally, the Bezier in the present embodiment is 3 Beziers, and function expression is：
B (t)=P0(1-t)3+3P1t(1-t)2+3P2t2(1-t)+P3t3,t∈[0,1] (2)
Wherein B (t) is data point, P0、P1、P2、P3For 4 control point on Bezier.The offset of Bezier
Put it was determined that still the form of Bezier to be determined by control point, so also needing to by data point reverse control point.If
Data point B0、B1、B2、B3It is that horizontally or vertically equally spaced 4 points of abscissa are (i.e. public on direction brightness Attenuation adjustable curve
In formula (2), parameter t takes corresponding point when 0,1/3,2/3,1 respectively), then 4 obtaining control point is respectively：
Optionally, when being shaped as rectangle of sootiness region in the present embodiment, after step S2, also includes before step S3：
Set up horizontal direction brightness decay adjustment curve, vertical direction brightness decay adjustment curve corresponding with sootiness region
Relation.
Specifically, the smokiness in sootiness region is with horizontally and vertically both direction brightness decay adjustment curve change of shape
And change, if sootiness regional extent is { (x, y) | Left≤x≤Right, Top≤y≤Bottom }, i.e. the upper left in sootiness region
Angle, bottom right angular coordinate are (Left, Top), (Right, Bottom) respectively.
The scope of horizontal direction brightness decay adjustment curve abscissa is [Hmin,Hmax], then horizontal direction brightness decay is adjusted
Any point h ∈ [H on pitch curvemin,Hmax] in sootiness region line correspondence
Vertical direction brightness decay adjustment curve abscissa scope is [Vmin,Vmax], then vertical direction brightness decay is adjusted
Any point v ∈ [V on curvemin,Vmax] in sootiness region line correspondence
Optionally, in sootiness region after step S2 any point (x, y) brightness：
V'(x, y)=V (x, y) × HBVal (h) × VBVal (v) (4)
Wherein x and y represents abscissa and vertical coordinate respectively, and V (x, y) is sootiness region any point (x, y) before step S2
Brightness, HBVal (h) is value at h for the horizontal direction brightness decay factor, and h is horizontally oriented on brightness decay adjustment curve
The abscissa of point corresponding with (x, y), VBVal (v) is value at v for the vertical direction brightness decay factor, and v is that vertical direction is bright
Abscissa with (x, y) corresponding point on degree Attenuation adjustable curve, the value of h and v is as follows respectively：
It should be noted that the shape in sootiness region, in addition to can be for rectangle, can also be circle in the present embodiment
Or the irregular figure of closing, it is also by adjusting the Bezier of two orthogonal directions, the sootiness effect in sootiness region to be entered
Row simulation, principle is similar with calculating, and here is omitted.
Provide specific examples below in the present embodiment, using said method, the simulation of mural painting sootiness effect sense of reality is entered
Row illustrates, flow process is as shown in fig. 6, specifically include：
Step S10, reads original mural painting image, is shown in designated area.
Select the original mural painting image Pic that size is M × Norig, it is read pixel-by-pixel in two-dimensional structure body array P.
The size of original mural painting image is not fixed, but display area size is fixed, so also needing to according to practical situation to original wall
Draw as carrying out scaling process.If image Aspect Ratio is identical with viewing area Aspect Ratio, directly zoom in and out；
But in most of the cases, image Aspect Ratio and viewing area Aspect Ratio may be different, so image is in viewing area
After display, may there is extraneous region in the two ends in horizontal or vertical direction.Need accurately to calculate image zooming ratio so as to complete
Whole be shown in viewing area after, level (vertical) direction is filled, and vertical (horizontal) direction allows there is extraneous region.If display
Area size is M' × N', then horizontal direction scaling, than ScaleH=M'/M, vertical direction scaling than ScaleV=N'/N, uses two
In person, minima Scale=Min { ScaleH, ScaleV } is to image PicorigCarry out scaling, the image ShowPic obtainingorigCan
To meet above-mentioned requirements.
Step S20, image obtained in the previous step is converted to hsv color space by RGB color, obtains arrayAnd preserve image PicorigData in hsv color space.
Step S30, selects sootiness region, the initialization horizontal direction brightness decay factor and vertical direction according to preset need
The brightness decay factor is so as to value at any point is 1.Specifically, carry out to exist by mouse during sootiness regional choice
Image PicorigOn chosen, and determine the scope in region according to the mouse event in operating process.
Taking determine rectangular area using mouse as a example, its flow process is as follows：First, setting area selection marker is True, opens
Begin to select sootiness region；Then, mouse is moved to image-region, press left mouse button, if mouse pointer and viewing area are left
Coordinate under screen coordinate system for the upper angle is respectively (MouX, MouY), (ShowLeft, ShowTop), and viewing area is vertical
The height (width) of (horizontal) direction extraneous region is Delta, then sootiness region starting point is in normal mural painting image coordinate system
Position (StartX, StartY) is as shown in Equation 6：
Continue to move to mouse pointer, then sootiness region also changes therewith, if left mouse button properly, is unclamped in region,
If now coordinate under screen coordinate system for the mouse pointer is (MouX', MouY'), then sootiness region final point is in normal mural painting
The position (EndX, EndY) of image coordinate system is as shown in Equation 7：
According to starting point (StartX, StartY) and end point (EndX, EndY) it is possible to determine sootiness region.If cigarette
The upper left corner in smoked region, bottom right angular coordinate are (Left, Top), (Right, Bottom) respectively, then obtain：
Certainly, selecting can also be using the mode beyond mouse, simply with conventional Mus in the present embodiment during sootiness region
It is designated as example to illustrate.Sootiness region therein can be the irregular figure of rectangle, circle or closing.
Step S40, by pulling horizontal direction brightness decay adjustment curve and vertical direction brightness decay adjustment curve
Mode adjusts the brightness in sootiness region, thus obtaining different degrees of sootiness effect.
Every brightness decay adjustment curve has 4 data points, and mouse pointer is moved to regulation window, presses mouse left
Mouse pointer coordinate can be mapped to, by executing the operation such as the viewport transform, back projection, the world's seat adjusting window place by key
In mark system.If mouse pointer coordinate and certain data point distance are near enough, then just can move this by pulling mouse pointer
Data point, thus change the shape of brightness decay adjustment curve.Initialize horizontal direction brightness decay regulation song by adjusting Fig. 2
Line and Fig. 3 initialize the shape of vertical direction brightness decay adjustment curve, the horizontal direction brightness decay adjustment curve obtaining and
Vertical direction brightness decay adjustment curve is respectively as shown in Figure 4 and Figure 5.While pulling brightness decay adjustment curve, permissible
The brightness of synchronized update sootiness region each point, thus represent the smokiness situation of change in sootiness region well.
Step S50, judges whether sootiness effect reaches expected requirement (i.e. expected sootiness effect).Basis for estimation is mainly
Whether true to nature observe the sootiness mural painting generating, if sense of reality meets needs, jump to step S60；Otherwise jump to step
S30 proceeds sootiness simulation, till meeting requirement.
Step S60, preserves the sootiness mural painting image obtaining, concrete operations are open file dialogs, selects suitable road
Footpath, file type and filename, the sootiness mural painting of generation is preserved.
In sum, the sootiness effect sense of reality analogy method that the present invention provides has following three aspect advantages：
(1) strong sense of reality.The present invention adopts brightness decay to simulate sootiness effect, meets brightness after mural painting is destroyed by sootiness
The practical situation of decay；Additionally, also by the brightness decay curve in interactive adjustment horizontally and vertically two orthogonal directions, permissible
Obtain the sootiness mural painting under various sootiness intensity distributions forms, meet mural painting and be subject to sootiness destroyed area sootiness intensity distributions irregular
Truth.
(2) step is simply and readily grasped.Traditional method generally requires 3～4 basic steps, and each basic step is also wrapped
If containing dry run, some complex operations also will continue to segment, so complex steps.The present invention only has 2 basic steps：Select cigarette
Smoked region, dragging brightness decay adjustment curve, are all conventional operations, need not continue to segment, therefore the present invention drastically reduce the area
The operating procedure of traditional sootiness analogy method, operation is fairly simple, for example：Regional choice, curve adjustment etc., are easily typically used
Family is grasped.
(3) widely applicable.The present invention sets up and is formed on model basis in the sootiness mural painting based on brightness decay, is independent of
In specific sector application, there is stronger versatility.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, common about technical field
Technical staff, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, therefore all
Equivalent technical scheme falls within scope of the invention, and the scope of patent protection of the present invention should be defined by the claims.
Claims (8)
1. sootiness effect sense of reality analogy method is it is characterised in that include：
S1, in HSV image select sootiness region, in described sootiness region the brightness decay factor of any point be horizontal direction bright
Degree decay factor and the product of the vertical direction brightness decay factor；
S2, described cigarette is changed by the value of the interactive adjustment horizontal direction brightness decay factor and the vertical direction brightness decay factor
The brightness in smoked region；
S3, judging whether the brightness in sootiness region reaches expected sootiness effect, if reached, stopping, otherwise to described sootiness
The operation of region repeat step S1～S3, till reaching；
Wherein, after described step S2, also include before step S3：
Set up described horizontal direction brightness decay adjustment curve, described vertical direction brightness decay adjustment curve and described sootiness area
The corresponding relation in domain；
The upper left corner in described sootiness region, bottom right angular coordinate are (Left, Top), (Right, Bottom) respectively, described level side
It is [H to the scope of brightness decay adjustment curve abscissamin,Hmax], then described horizontal direction brightness decay adjustment curve is taken up an official post
1 point of h ∈ [Hmin,Hmax] in described sootiness region line correspondenceDescribed vertical side
It is [V to brightness decay adjustment curve abscissa scopemin,Vmax], then arbitrary on described vertical direction brightness decay adjustment curve
Point v ∈ [Vmin,Vmax] in described sootiness region line correspondence
2. sootiness effect sense of reality analogy method according to claim 1 is it is characterised in that also wrap before described step S1
Include：
Image is converted to the array in hsv color space in the array of RGB color, obtains HSV image.
3. sootiness effect sense of reality analogy method according to claim 1 is it is characterised in that also wrap before described step S2
Include：
Initialize the horizontal direction brightness decay factor and the vertical direction brightness decay factor so as to value at any point is 1,
Corresponding horizontal direction brightness decay adjustment curve and vertical direction brightness decay adjustment curve are straight line.
4. sootiness effect sense of reality analogy method according to claim 3 is it is characterised in that described after described step S2
The brightness V'(x of any point (x, y) in sootiness region, y)=V (x, y) × HBVal (h) × VBVal (v), wherein x and y are respectively
Represent abscissa and vertical coordinate, V (x, y) is the brightness in sootiness region any point (x, y) before step S2, HBVal (h) is level
Value at h for the direction brightness decay factor, h is on described horizontal direction brightness decay adjustment curve and (x, y) corresponding point
Abscissa, VBVal (v) is value at v for the vertical direction brightness decay factor, and v is that described vertical direction brightness decay adjusts song
Abscissa with (x, y) corresponding point on line.
5. the sootiness effect sense of reality analogy method according to claim 3 or 4 is it is characterised in that described horizontal direction is bright
Degree Attenuation adjustable curve and described vertical direction brightness decay adjustment curve are Bezier.
6. sootiness effect sense of reality analogy method according to claim 5 is it is characterised in that described Bezier is 3
Secondary Bezier, function expression is：
B (t)=P0(1-t)3+3P1t(1-t)2+3P2t2(1-t)+P3t3, t ∈ [0,1], wherein B (t) are data point, P0、P1、P2、
P3For 4 control point on described Bezier.
7. sootiness effect sense of reality analogy method according to claim 1 is it is characterised in that the shape in described sootiness region
For rectangle.
8. sootiness effect sense of reality analogy method according to claim 1 is it is characterised in that the shape in described sootiness region
For circular or closing irregular figure.
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| CN101674390A (en) * | 2008-09-12 | 2010-03-17 | 致伸科技股份有限公司 | Method for adjusting brightness of image |
| CN101815158A (en) * | 2009-02-20 | 2010-08-25 | 华晶科技股份有限公司 | Compensation method for improving color shadow in digital images |
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| CN1571011A (en) * | 2003-11-21 | 2005-01-26 | 友达光电股份有限公司 | Method for displaying image on optical display device with discrepancy brightness attenuation pixel |
| CN101674390A (en) * | 2008-09-12 | 2010-03-17 | 致伸科技股份有限公司 | Method for adjusting brightness of image |
| CN101815158A (en) * | 2009-02-20 | 2010-08-25 | 华晶科技股份有限公司 | Compensation method for improving color shadow in digital images |
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