CN106127842A - A kind of combination distribution of light sources exposes, with the face of reflection characteristic, the method and system that 3D prints - Google Patents
A kind of combination distribution of light sources exposes, with the face of reflection characteristic, the method and system that 3D prints Download PDFInfo
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- CN106127842A CN106127842A CN201610426060.9A CN201610426060A CN106127842A CN 106127842 A CN106127842 A CN 106127842A CN 201610426060 A CN201610426060 A CN 201610426060A CN 106127842 A CN106127842 A CN 106127842A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/50—Lighting effects
Abstract
A kind of combination distribution of light sources relates to intelligentized control method and image identification technical field with the method and system of the face exposure 3D printing of reflection characteristic.The method, for the purpose of the part improving face exposure rapid forming system makes precision, comprises the steps: DATA REASONING: successively the gray level image that pre-generatmg is good is divided sub-block in the case of light source front has resin storage tank to block and carry out illumination power measurement；Data analysis: the illumination power data obtaining each image subblock measurement under each position is analyzed, obtains the illumination power rule with grey scale change of image subblock under this position；Utilize vertical projection method, according to illumination power and the corresponding relation of gray scale, the half-tone information of image subblock is saved in the relevant position of homography；Image co-registration is carried out according to half-tone information matrix and original slice gradation data.The present invention can improve the uniformity of exposure, has portability and printability simultaneously.Therefore, the present invention has certain using value and meaning.
Description
Technical field
The present invention relates to intelligentized control method and image recognition technology, be specifically related to the homogenization to projector light energy output,
Carry out Automatic adjusument by the gray scale combining the section that distribution of light sources prints with reflection characteristic opposite exposure 3D, thus realize knot
Close research and the realization of the method and system of the face exposure 3D printing of distribution of light sources and reflection characteristic.
Background technology
20th century the mid-80 is born in by 3D printer, American scientist invent the earliest.3D printer refers to
Utilizing 3D printing technique to produce a kind of equipment of true three-dimension object, its ultimate principle is to utilize special consumptive material (glue, tree
Fat or powder etc.) according to by the pre-designed three-dimensional stereo model of computer, by the deposition of adhesive, every layer of powder is cohered
Molding, finally prints 3D entity.
Rapid Prototyping technique is fast with its process velocity, low cost, is widely used in the modelling of product development stage.3D
Printing is the one of Rapid Prototyping technique, and first article are converted into 3D data by it, then use powdery metal or plastics etc.
Can jointing material, successively cut printing.Making mold, industrial design are used for building model, are now just developing into product manufacturing, are formed
" direct digitization manufacture ".Form multiple different fast shaping technology, such as Stereo Lithography (SLA), lamination entity at present
Manufacture (LOM), fusion sediment moulding (FDM), Selective laser sintering (SLS), 3 D-printing (3DP) etc..Photocuring rapid prototyping
(SLA) being filled scanning light-cured resin by laser facula pointwise, by-line, form resin-cured layer, resin solidification successively adds up, system
Make physical model.Comparing with other fast shaping technology, photocuring rapid prototyping part precision is high, and surface quality is good, post processing
Technique is simple, is widely used, and on market, installed capacity reaches more than 69%.
For face exposure rapid forming system, not only low cost, and the solidification of flood single exposure can be realized, significantly
Shorten Production Time, improve make efficiency.But the light radiated due to ultraviolet source is that spherical divergence light face simultaneously exposes
The resin storage tank that light 3D prints is that ultraviolet light can be played reflection by glass material, causes the Luminance Distribution of light-emitting zone to exist not
Uniformly so that in print procedure in the diverse location of same section resin be solidified with difference, have a strong impact on the essence of product
Degree.The most also for this reason that the thing plane of exposure making face exposure print is smaller, it is impossible to accomplish large-area exposure.
Summary of the invention:
The embodiment of the present invention, by providing a kind of combination distribution of light sources method that the face exposure 3D with reflection characteristic prints, is used for
Improve exposition uniformity, reduce overexposure or under-exposure.
For solving above-mentioned technical problem, the embodiment of the present invention adopts the following technical scheme that
A kind of combination distribution of light sources and the method for the face exposure 3D printing of reflection characteristic, comprise the following steps:
100, the same ash of a series of different GTGs that the Attribute Relative of the sectioning image that generation goes out from projector is answered
The image of degree, and by the image subblock that each width image division is the diverse location that m × n area is identical, successively to division
Image subblock carries out illumination power measurement in the case of light source front has resin storage tank to block；
200, the illumination power data obtaining each image subblock measurement under each position is analyzed, and obtains this position
The illumination power of the image subblock under putting is with the rule of grey scale change；
300, according to the luminous power of the image subblock under all positions with the rule of grey scale change, vertical projection method's handle is utilized
All of section stacks up so that it is determined that the suitableeest power, and searches in the image subblock of each position corresponding with this suitableeest power
Gray value, save as the matrix of gray value information of the m × n of correspondence；
400, generate according to the matrix of the gray value information of m × n and consistent with the attribute of original slice images comprise m × n
The image of individual grey blocks, carries out interpolation processing to the image comprising m × n grey blocks, then by the image after interpolation with original
Sectioning image merges, and obtains adaptive sectioning image.
Wherein, the illumination power data obtaining each image subblock measurement under each position is analyzed, and is somebody's turn to do
The illumination power of the image subblock under position includes with the step 200 of the rule of grey scale change:
The illumination power data obtaining the image subblock measurement of the different gray scales under each position carries out Fourier and divides
Analysis, obtains the image subblock of this position ultraviolet light irradiation degree under the having reflection case rule with grey scale change；
The ultraviolet light irradiation degree of the image subblock according to this position, with grey scale change Changing Pattern, determines the figure under this position
As sub-block is 25 to the data that gray scale is illumination power corresponding to 255 from gray scale, save as the gray scale corresponding with this position and
The data pair of ultraviolet light irradiation degree.
Wherein, according to the luminous power of the image subblock under all positions with the rule of grey scale change, vertical projection method is utilized
All of section is stacked up so that it is determined that the suitableeest power, and search in the image subblock of each position with this suitableeest power pair
The gray value answered, the step 300 of the matrix saving as the gray value information of the m × n of correspondence includes:
The section of one model to be printed is all overlapped on a figure, and wherein white is the ground with the presence of model
Side, black is the region not having model, then according to the ultraviolet light irradiation degree of the image subblock at white portion place with ash
The rule of degree change, chooses the minima that meets in these sub-blocks in illumination power data corresponding under maximum gray scale as
Suitable power；
According to the suitableeest power determined, for the image subblock of each position, corresponding with this position preserved
The data centering of gray scale and ultraviolet light irradiation degree is found and the immediate luminous power of the suitableeest power, by this immediate luminous power number
According to corresponding gray scale output, the gray value of output is preserved into the gray value letter of a m × n corresponding with the image subblock of m × n
The matrix of breath.
In step 400, generate consistent with the resolution of original slice images according to the matrix of the gray value information of m × n
The step of the image comprising m × n grey blocks also include:
Attribute according to section generates the gray level image comprising m × n identical image unit for interpolation；
The matrix of the gray value information of m × n that scanning is preserved successively, is assigned to each gray value to use
Correspondence image unit in the gray level image of interpolation, thus generate the gray level image comprising m × n grey blocks；
Being merged with original slice images by image after interpolation, the step obtaining adaptive sectioning image includes:
The gray value of each pixel of gray level image after scanning interpolation, skips when gray value is less than 25 and scans next successively
Individual pixel, when gray value is more than or equal to 25, obtains the gray value of this pixel, this gray value is assigned to original image
The same pixel position of section, draws adaptive sectioning image.
Wherein, in step 100, a series of different ashes that the sectioning image Attribute Relative gone out from projector is answered are generated
The step of the image of the same gray scale on rank includes:
From the beginning of GTG is 25, generate the Attribute Relative of the sectioning image that a pair goes out with projector every 10 GTGs
The image of the same grayscale answered, until till generating the image of same grayscale that GTG is 255, constituting a series of different GTG
The image of same grayscale.
This patent also provides for the system of a kind of combination distribution of light sources and the face exposure 3D printing of reflection characteristic, surveys including data
Amount module, data analysis module, the suitableeest power determination module and data fusion module.
Wherein, described data measurement module is arranged to: first have to generate to go out with projector the genus of sectioning image
Property corresponding a series of different GTGs same gray level image, and be that m × n area is identical not by each width image division
The image subblock of co-located, then we need in the case of light source front has resin storage tank to block successively to image divided
Block carries out illumination power measurement；
Described data analysis module is arranged to: obtain measured illumination power data from described measurement module, to each
The illumination power data that each image subblock measurement under individual position obtains is analyzed, and obtains resin storage tank to the impact of illumination and nothing
Illumination patterns in the case of resin storage tank, the illumination power of the image subblock under each position when then obtaining having resin storage tank to block
Rule with grey scale change；
The suitableeest described power determination module is arranged to: the section of a model to be printed is all overlapped a figure
On, wherein white is for having model where, and black is the region not having model, obtains from described data analysis module
The luminous power of the image subblock under all positions is with the rule of grey scale change, according to the light merit of the image subblock under all positions
Rate determines the suitableeest power with the rule of grey scale change, and searches gray scale corresponding with this suitableeest power in each image subblock
Value, our default setting black is that the gray scale in the region not having model is minimum, then the gray scale of all of sub-block simultaneously
Information saves as the matrix of the gray value information of the m × n of correspondence；
Described fusion treatment module is arranged to: obtain the square of the gray value information of described m × n from the suitableeest power determination module
Battle array, generates according to the matrix of the gray value information of m × n and consistent with the attribute of original slice images comprises m × n grey blocks
Image, carries out interpolation processing to the image comprising m × n grey blocks, is then entered with original slice images by the image after interpolation
Row merges, and obtains adaptive sectioning image.
Wherein, described data analysis module 20 is specifically arranged to:
The illumination power data obtaining the image subblock measurement of the different gray scales under each position carries out Fourier and divides
Analysis, obtains the ultraviolet light irradiation degree of image subblock of this position with grey scale change Changing Pattern；
The ultraviolet light irradiation degree of the image subblock according to this position, with grey scale change Changing Pattern, determines the figure under this position
As sub-block is 25 to the data that gray scale is ultraviolet light irradiation degree corresponding to 255 from gray scale, save as the ash corresponding with this position
Degree and the data pair of ultraviolet light irradiation degree.
Wherein, the suitableeest described power determination module is specifically configured to:
The ultraviolet light irradiation degree of the image subblock according to all of m × n position, with the rule of grey scale change, is chosen all
Section white portion tires out minima in the illumination power data that sub-block in folded region is corresponding under maximum gray scale as
Suitable power, the gray scale being provided with black sub-block correspondence position is minimal gray；
According to the suitableeest power determined, for the image subblock of each position, corresponding with this position preserved
The data centering of gray scale and ultraviolet light irradiation degree is found and the immediate luminous power of the suitableeest power, by this immediate luminous power number
According to corresponding gray scale output, the gray value of output is preserved into the gray value letter of a m × n corresponding with the image subblock of m × n
The matrix of breath.
Wherein, described data fusion module is set to by following manner raw according to the matrix of the gray value information of m × n
Become the image that comprise m × n grey blocks consistent with the attribute of original slice images:
Attribute according to section generates the gray level image comprising m × n identical image unit for interpolation；Scan successively
The matrix of the gray value information of the m × n preserved, is assigned to each gray value in the gray level image of interpolation
Correspondence image unit, thus generate and comprise the gray level image of m × n grey blocks；
Described data fusion module is set to be carried out with original slice images by the image after interpolation by following manner
Merge, obtain combining the adaptive sectioning image of distribution of light sources and reflection characteristic:
The gray value of each pixel of gray level image after scanning interpolation, skips when gray value is less than 25 and scans next successively
Individual pixel, when gray value is more than or equal to 25, obtains the gray value of this pixel, this gray value is assigned to original image
The same pixel position of section, draws adaptive sectioning image.
Wherein, described data measurement module is arranged through following manner and generates the sectioning image genus gone out with projector
Property corresponding a series of different GTGs the image of same gray scale:
From the beginning of GTG is 25, generate the Attribute Relative of the sectioning image that a pair goes out with projector every 10 GTGs
The image of the same grayscale answered, until till generating the image of same grayscale that GTG is 255, constituting a series of different GTG
The image of same grayscale.
The light source adaptive approach based on face exposure fast shaping technology of the embodiment of the present invention and system have the most excellent
Point:
1) improve exposition uniformity, be sphere owing to the homogenization of luminous power compensate for the light that ultraviolet source radiates
The Luminance Distribution of the light-emitting zone that diverging light and resin storage tank direct reflection cause there are differences, as long as it is correct just so to print technique
The probability of overexposure or under-exposure can be reduced as far as possible；
2) portable, according to the light output difference of different printers, after obtaining some specific data, native system can
To quickly generate the gray scale picture making illumination power be evenly distributed；
3) printability, this illumination power adaptive system, it is possible to be applicable to the mould that the overwhelming majority processes without optimization
Type, the suitability is strong, is once printed as power high.Therefore, the present invention has certain using value and meaning.
Accompanying drawing illustrates:
Fig. 1 is the operation principle of projector.
The flow process of the method that the face exposure 3D of Fig. 2 combination distribution of light sources according to embodiments of the present invention and reflection characteristic prints
Figure.
Fig. 3 is the schematic diagram of the impact that resin storage tank reflection opposite exposure prints.
Fig. 4 is that the image subblock of 9 × 8 under a certain gray scale of preparation ultraviolet light irradiation measurement amount divides schematic diagram.
Fig. 5 is the intensity of illumination scattergram having resin storage tank to block under a certain gray scale and blocking without resin storage tank, wherein top
For unscreened, lower section for there to be resin storage tank to block.
Fig. 6 is the ultraviolet lighting intensity rule with grey scale change of the image subblock under a certain position.
Fig. 7 is this algorithm linear interpolation design sketch.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.It should be noted that do not conflicting
In the case of, the embodiment in the application and the feature in embodiment can mutual combination in any.
The present invention provides the system of a kind of combination distribution of light sources and the face exposure 3D printing of reflection characteristic, and this system can be real
Now the gray scale to each section carries out adaptive regulation, thus reaches the ultraviolet light irradiation degree distribution in view generation plane
Homogenization, providing for follow-up large area exposure may.
Face exposure 3D printer, main use projector is as light source, and the most important thing is digital micro-mirror in projector
Element (DMD) completes the technology that viewable numbers information shows.Specifically, it is simply that digital light processes (DLP) shadow casting technique should
It is used as Chief treatment element to realize optical digital computing process with digital micro-mirror wafer (DMD).The principle of DLP is such as
Shown in lower:
We are as a example by 1024 × 768 resolution now, have 1024 × 768 small reflectors on one piece of DMD, each
Mirror represents a pixel, and each small reflector has the independent switching capability controlling light.Small reflector reflection light
Angle modulated by digital light processor by video signal control, video signal, video signal is modulated into the arteries and veins of constant amplitude
Wide modulated signal, controls the time of small reflector open and close light path by pulse width size, produces different brightness on screen
Grey scale image.DMD scialyscope can be divided into one chip, double-disk and three-chip type according to the number of reflecting optics.With monolithic
As a example by formula, it is the colour wheel (1020) (group forms by red, green, blue) owing to being placed in source path that DLP can produce color, light source
(1010) light sent produces RGB three primary colours by collecting lens to chromatic color filter, comprises the dmd chip of thousands of micro mirror
(1030) light, sent by light source projects one by the red, green, blue filter of quick rotation and studs with the micro-of micro mirror array
The surface of chip DMD, these micromirror rotate with the speed of 5000 times per second, reflect incident illumination, via shaping lens (1040)
Colour picture (1050), projector as shown in Figure 1 is projected afterwards by camera lens.
Owing to existing research is mainly reflected in the structure aspect of view generator, about in view plane to irradiance
The research of distribution is little, lets alone the face exposure 3D print system being to combine distribution of light sources with reflection characteristic.The present invention implements
The improvement that the method and system of example prints for face exposure 3D is on the DMD of projector, based on to the projection under different gray scales
The view surface gone out carries out the measurement of optical power value in the case of having resin storage tank to block, thus sets up diverse location in a section
The relational model of ultraviolet light irradiation degree and gray-value variation, by the ultraviolet light irradiation degree of diverse location and gray-value variation
It is analyzed, thus designs a kind of to the section adaptive system of gray scale, import a section then by upright projection
Method adaptively changing gray scale proposes a most viable illumination performance number simultaneously, accordingly generates one under this illumination power
Intensity profile figure, finally merges this intensity profile figure, the sectioning image needed for generation with sectioning image.Shown in Fig. 1 it is
The operation principle schematic diagram of projector, the method and system of the present invention is applied on digital micro-mirror wafer (DMD), i.e. the DLP of Fig. 1
(digital light process) part.
Fig. 2 is the combination distribution of light sources flow chart with the face exposure 3D Method of printing of reflection characteristic of the embodiment of the present invention.
The embodiment of the present invention proposes the face exposure 3D Method of printing of a kind of combination distribution of light sources and reflection characteristic, including:
Step 100, generates the same of a series of different GTGs that the Attribute Relative of sectioning image gone out from projector answers
The image of one gray scale, and by the image subblock that each width image division is the diverse location that m × n area is identical, successively to drawing
The image subblock divided carries out illumination power measurement in the case of light source front has resin storage tank to block；
Step 200, the illumination power data obtaining each image subblock measurement under each position are analyzed, and obtain
The illumination power of the image subblock under this position is with the rule of grey scale change；
Step 300, the section of a model to be printed all being overlapped on a figure, wherein white is for there being model to deposit
Place, black is the region not having model, then according to the ultraviolet light irradiation of the image subblock at white portion place
Spend the rule with grey scale change, choose the minima met in these sub-blocks in illumination power data corresponding under maximum gray scale
As the suitableeest power, and search gray scale corresponding with this suitableeest power in the image subblock of each white sub-block correspondence position
Value, saves as the matrix image of the gray value information of the m × n of correspondence, and the gray scale being provided with black sub-block correspondence position is
Little gray scale.
This patent can determine the suitableeest power automatically according to the luminous power of all image subblocks with the rule of grey scale change,
Or needing manually to arrange according to user is most power；By adjusting the image subblock output gray level of each position so that it is output
Power is the suitableeest power；
Step 400, matrix according to the gray value information of m × n generate and consistent with the attribute of original slice images comprise m
The image of × n grey blocks, carries out interpolation processing to ensure the flat of output gray level change to the image comprising m × n grey blocks
Slip；Carry out merging by the image after interpolation and original slice images further and obtain adaptive sectioning image.
Alternatively, described step 100 includes following sub-step:
Sub-step 110, it is that 25 beginnings generate the images of secondary same grayscale every 10 GTGs, until generating from GTG
Till GTG is the image of the same grayscale of 255, generate so altogether the image of the same grayscale of 24 width difference GTGs, constitute one
The image of the same grayscale of the different GTG of series.
The image of the same grayscale of a series of different GTGs refers to that the gray scale of each pixel is identical in each width gray level image
, the gray scale of each width image of different GTGs differs, and the gray scale difference of each width image of i.e. different GTGs is 10 GTGs
Integral multiple.
Sub-step 120, for the every piece image in the image of the same grayscale of described a series of different GTGs, will regard
Drawing is divided into the image subblock of m × n area equation.
Alternatively, the limiting factor such as environment that the value of m and n is measured according to reality determines, such as, and m=9, n=8, Fig. 3
It show the image subblock that view surface is divided into 9 × 8 area equation.The position at image subblock place is represented with (mi, ni),
Mi and ni is integer, and 1≤mi≤m, and 1≤ni≤n.
Sub-step 130, for the every piece image in the image of the same grayscale of described a series of different GTGs, it is contemplated that
The resin storage tank reflection to light when face exposure 3D prints, as it is shown on figure 3, therefore utilize projection that light was thrown resin storage tank and throw at wall
On, then with high-precision power/energy meter (Newport 2936-C), each image subblock in view plane is surveyed successively
Amount, obtains the ultraviolet light irradiation degrees of data of each image subblock.Thus obtain regulating in front view plane identical without gray scale
On the premise of gray scale, the ultraviolet light irradiation degree distributed data of m × n image subblock of diverse location, needs the most altogether to record 24
The greyscale image data corresponding to ultraviolet light irradiation degree of width m × n.
Further, step 200 includes:
Sub-step 210, to measure obtain 24 width m × n corresponding to ultraviolet light irradiation degree greyscale image data use
Fourier techniques is analyzed, and can obtain shape relational expression such as:
F (x)=a0+a1*cos(x*w)+b1*sin(x*w)
Wherein f (x) represents illumination performance number and the relation of gray scale under different gray scales, and x represents that gray scale, w represent angular frequency
Rate (radian per second).This relational expression represent the ultraviolet light irradiation degree under the image subblock of same position with grey scale change Changing Pattern,
As shown in Figure 4.
Sub-step 220, according to the ultraviolet light irradiation degree under the image subblock under each position with the rule of grey scale change,
Image subblock under each position is 25 to the data of the light intensity that GTG is 255 correspondences, totally 230 groups of data from GTG.With
Time, analyze the change of the intensity of illumination distribution having resin storage tank to block under a certain gray scale and to block without resin storage tank, as it is shown in figure 5,
It appeared that the reflection of light has strong influence to the quality printed really.
Further, step 300 includes:
Sub-step 310, according to the ultraviolet light irradiation degree of the image subblock of all m × n positions with the rule of grey scale change,
As shown in Figure 6, it can be deduced that, in identical position, become larger with the increase illumination power of gray value.
Utilize vertical projection method, i.e. the section of a model to be printed is all overlapped on a figure, wherein white
For having model where, black is the region not having model, then according to the image subblock at white portion place
Ultraviolet light irradiation degree, with the rule of grey scale change, is chosen and is met illumination power data corresponding under maximum gray scale in these sub-blocks
In minima as the suitableeest power, the gray scale being provided with black sub-block correspondence position is minimal gray.
Sub-step 320, according to the suitableeest power determined, for each figure in the image subblock of described m × n position
As sub-block, in storage has the data of the gray value corresponding with this position and luminous power to file, find the data of coupling, at this moment
There will be two values closest to it, one is more lower slightly than it, and one is more slightly higher than it, compares the two value to the suitableeest power
The amplitude of difference, selects the output of the gray value corresponding to that power that difference amplitude is little.
Owing to the gray value of each output is corresponding diverse location, default setting is to arrange in advance again, by the ash of output
Angle value preserves into the matrix of the gray value information of a m × n corresponding with the image subblock of m × n, the information of these data preserved
It is exactly the half-tone information of the different masses of the gray level image needed in fact.
Described step 400 includes:
Sub-step 410, obtain section attribute (picture altitude, width, adjacent lines same column point between byte number), so
The gray level image comprising m × n identical image unit for interpolation is generated afterwards according to the attribute of section；
The matrix of sub-step 420, the successively gray value information of m × n that scanning is preserved, each gray value
The correspondence image unit being assigned in the gray level image of interpolation, obtains the grey blocks that gray scale is designated value, thus generates bag
Gray level image containing m × n grey blocks；
Sub-step 430, use bilinear interpolation, carried out at interpolation the gray level image of the described m of comprising × n grey blocks
Reason, obtains the gray level image after interpolation, as it is shown in fig. 7, wherein represent gray scale height, i.e. hacures so that hacures are dense in figure
The denseest gray scale is the lowest.
Sub-step 440, the gray level image after interpolation and original image are carried out fusion treatment by following manner: scan successively
The gray value of each pixel of gray level image after interpolation, skips the next pixel of scanning, works as gray scale when gray value is less than 25
When value is more than or equal to 25, obtains the gray value of this pixel, this gray value is assigned to the phase of the section pixel of original image
Co-located, draws the adaptive sectioning image combining distribution of light sources with reflection characteristic after the end of scan.
The embodiment of the present invention also provides for the face exposure 3D print system of a kind of combination distribution of light sources and reflection characteristic, this system
Can perform previously described light source adaptive approach, therefore, the feature described above for the method is equally applicable to this light
It is derived from adaptive system.
According to a kind of specific embodiment, this system includes that data measurement module 10, data analysis module 20, the suitableeest power are true
Cover half block 30 and data fusion module 40.
Described data measurement module 10 is arranged to: first have to generate to go out with projector the attribute phase of sectioning image
The same gray level image of corresponding a series of different GTGs, and be the not coordination that m × n area is identical by each width image division
The image subblock put, then we need to enter the image subblock divided successively in the case of light source front has resin storage tank to block
Row illumination power measurement.
Alternatively, the limiting factors such as the environment that the value of n is measured according to reality determine, such as, shown in m=9, n=8, Fig. 4
For view surface being divided into the image subblock of 9 × 8 area equation.With (mi, ni) represent image subblock place position, mi and
Ni is integer, and 1≤mi≤m, and 1≤ni≤n.
Described data analysis module 20 is arranged to: obtain measured illumination power data from described measurement module 10, right
The illumination power data that each image subblock measurement under each position obtains is analyzed, and obtains the image subblock under this position
Illumination power with the rule of grey scale change, and have resin storage tank to block under a certain gray scale and the illumination blocked without resin storage tank is strong
The Changing Pattern of degree distribution.
Described the suitableeest power determination module 30 is arranged to: the section of a model to be printed is all overlapped a figure
On, wherein white is for having model where, and black is the region not having model, then according to white portion place
The ultraviolet light irradiation degree of image subblock, with the rule of grey scale change, is chosen and is met correspondence under maximum gray scale in these sub-blocks
Minima in illumination power data as the suitableeest power, and search in the image subblock of each white sub-block correspondence position with
The gray value that this suitableeest power is corresponding, saves as the matrix image of the gray value information of the m × n of correspondence, is provided with black
The gray scale of block correspondence position is minimal gray.
Described fusion treatment module 40 is arranged to: obtain the matrix of the gray value information of m × n from the suitableeest power determination module
Image, generates according to the matrix of the gray value information of m × n and consistent with the attribute of original slice images comprises m × n grey blocks
Image, the image comprising m × n grey blocks is carried out interpolation processing, then by the image after interpolation and original slice images
Merge, obtain adaptive sectioning image.
Wherein, described data measurement module 10 is arranged through following manner and generates the slice map gone out with projector
The same gray level image of a series of different GTGs that the height of picture is corresponding with width: be that 25 beginnings are every 10 GTGs from GTG
Generate the image of a secondary same grayscale, until till generating the image of same grayscale that GTG is 255, so having generation 24 altogether
The image of the same grayscale of width difference GTG, constitutes the image of the same grayscale of a series of different GTG.
The image of the same grayscale of a series of different GTGs refers to that the gray scale of each pixel is identical in each width gray level image
, the gray scale of each width image of different GTGs differs, and the gray scale difference of each width image of i.e. different GTGs is 10 GTGs
Integral multiple.
Wherein, described data measurement module 10 be arranged through following manner to divide image subblock carry out illumination merit
Rate is measured: for the every piece image in the image of the same grayscale of described a series of different GTGs, we utilize projector handle
Image projects on wall through resin storage tank, with each in view plane of high-precision power/energy meter (Newport 2936-C)
Image subblock measures successively, obtains the ultraviolet light irradiation degrees of data of each image subblock.Thus obtain regulating without gray scale
In front view plane on the premise of same grayscale the ultraviolet light irradiation degree distributed data of m × n image subblock of diverse location,
Need the most altogether to record the greyscale image data corresponding to ultraviolet light irradiation degree of 24 width m × n.
Described data analysis module 20 is arranged through following manner and is analyzed from illumination power data, obtains each
The illumination power of the image subblock under individual position is with the rule of grey scale change:
Measure the greyscale image data Fourier techniques corresponding to ultraviolet light irradiation degree of 24 width m × n obtained to carry out point
Analysis, can obtain shape relational expression such as:
F (x)=a0+a1*cos(x*w)+b1*sin(x*w)
Wherein f (x) represents illumination performance number and the relation of gray scale under different gray scales, and x represents that gray scale, w represent angular frequency
Rate (radian per second).This relational expression represents that the ultraviolet light irradiation degree under the image subblock of same position is with grey scale change Changing Pattern；
According to the ultraviolet light irradiation degree under the image subblock under each position with the rule of grey scale change, obtain the figure under each position
As sub-block is 25 to the data of the ultraviolet light intensity that GTG is 255 correspondences, totally 230 groups of data from GTG.
Described the suitableeest power determination module 30 arranges and is specifically configured to:
The section of one model to be printed is all overlapped on a figure, and wherein white is the ground with the presence of model
Side, black is the region not having model, then according to the ultraviolet light irradiation degree of the image subblock at white portion place with ash
The rule of degree change, chooses the minima that meets in these sub-blocks in illumination power data corresponding under maximum gray scale as
Suitable power, and search gray value corresponding with this suitableeest power in the image subblock of each white sub-block correspondence position, preserve
For the matrix image of the gray value information of corresponding m × n, the gray scale being provided with black sub-block correspondence position is minimal gray.
For each image subblock in the image subblock of described m × n position, have corresponding with this position in storage
The file of the data pair of gray value and luminous power is found the data of coupling, at this moment there will be two values closest to it, one
Being more lower slightly than it, one is more slightly higher than it, compares the two value amplitude to the difference of the suitableeest power, selects difference amplitude little
Gray value output corresponding to that power.
Owing to the gray value of each output is corresponding diverse location, default setting is to arrange in advance again, by the ash of output
Angle value preserves into the matrix of the gray value information of a m × n corresponding with the image subblock of m × n, the information of these data preserved
It is exactly the half-tone information of the different masses of the gray level image needed in fact.
Described fusion treatment module 40 is arranged to: by following manner by the matrix image interpolation of the gray value information of m × n
Become the intensity profile image consistent with the resolution of original slice images:
Obtain section attribute (picture altitude, width, adjacent lines same column point between byte number), then according to section
Attribute generate for the gray level image comprising m × n identical image unit of interpolation；
According to the matrix having gray value information of the m × n obtained from the suitableeest power determination module, each ash
The correspondence image unit that angle value is assigned in the gray level image of interpolation, thus obtain the grey blocks that gray scale is designated value, depend on
The method travels through the data in the matrix having gray value information of described m × n, thus generates the gray scale comprising m × n grey blocks
Image；
With bilinear interpolation, the gray level image of the described m of comprising × n grey blocks is carried out interpolation processing, obtains interpolation
After gray level image, as shown in Figure 7.
Described fusion treatment module 40 is arranged through following manner and is carried out with original slice images by the image after interpolation
Merge, obtain combining distribution of light sources and the adaptive sectioning image of reflection characteristic: the gray level image after scanning interpolation is every successively
The gray value of individual pixel, skips the next pixel of scanning, when gray value is more than or equal to 25, obtains when gray value is less than 25
Take the gray value of this pixel, this gray value is assigned to the same position of the section pixel of original image, after the end of scan
Go out adaptive sectioning image.
The combination distribution of light sources of the embodiment of the present invention has as follows with face exposure 3D Method of printing and the system of reflection characteristic
Advantage:
1) improve exposition uniformity, be sphere owing to the homogenization of luminous power compensate for the light that ultraviolet source radiates
The Luminance Distribution of the light-emitting zone that diverging light and resin storage tank direct reflection cause there are differences, as long as it is correct just so to print technique
The probability of overexposure or under-exposure can be reduced as far as possible；
2) portable, according to the light output difference of different printers, after obtaining some specific data, native system can
To quickly generate the gray scale picture making illumination power be evenly distributed；
3) printability, this illumination power adaptive system, it is possible to be applicable to the mould that the overwhelming majority processes without optimization
Type, the suitability is strong, is once printed as power high.Therefore, the present invention has certain using value and meaning.
Claims (10)
1. the method combining distribution of light sources and the face exposure 3D printing of reflection characteristic, it is characterised in that comprise the following steps:
100, the same gray scale of a series of different GTGs that the Attribute Relative of sectioning image gone out from projector is answered is generated
Image, and by the image subblock that each width image division is the diverse location that m × n area is identical, successively to the image divided
Sub-block carries out illumination power measurement in the case of light source front has resin storage tank to block；
200, the illumination power data obtaining each image subblock measurement under each position is analyzed, and obtains under this position
The illumination power of image subblock with the rule of grey scale change；
300, according to the luminous power of the image subblock under all positions with the rule of grey scale change, utilize vertical projection method all
Section stack up so that it is determined that the suitableeest power, and search ash corresponding with this suitableeest power in the image subblock of each position
Angle value, saves as the matrix of the gray value information of the m × n of correspondence；
400, according to the matrix of the gray value information of m × n generate consistent with the attribute of original slice images comprise m × n grey
The image of degree block, carries out interpolation processing to the image comprising m × n grey blocks, then by the image after interpolation and original slice
Image merges, and obtains adaptive sectioning image.
Method the most according to claim 1, it is characterised in that step 200 includes:
The illumination power data obtaining the image subblock measurement of the different gray scales under each position carries out Fourier analysis,
To the image subblock of this position ultraviolet light irradiation degree under having reflection case with the rule of grey scale change；
The ultraviolet light irradiation degree of the image subblock according to this position, with grey scale change Changing Pattern, determines image under this position
Block is 25 to the data that gray scale is illumination power corresponding to 255 from gray scale, saves as the gray scale corresponding with this position and ultraviolet
The data pair of light irradiance.
Method the most according to claim 1, it is characterised in that step 300 includes:
The section of one model to be printed is all overlapped on a figure, and wherein white is for having model where, black
Color is the region not having model, then according to the ultraviolet light irradiation degree of the image subblock at white portion place with grey scale change
Rule, choose the minima met in these sub-blocks in illumination power data corresponding under maximum gray scale as the suitableeest merit
Rate；
According to the suitableeest power determined, for the image subblock of each position, in the gray scale corresponding with this position preserved
Data centering with ultraviolet light irradiation degree is found and the immediate luminous power of the suitableeest power, by these immediate luminous power data
Corresponding gray scale output, preserves into the gray value information of a m × n corresponding with the image subblock of m × n by the gray value of output
Matrix.
Method the most according to claim 1, it is characterised in that step 400 includes:
Attribute according to section generates the gray level image comprising m × n identical image unit for interpolation；
The matrix of the gray value information of m × n that scanning is preserved, is assigned to each gray value for interpolation successively
Gray level image in correspondence image unit, thus generate and comprise the gray level image of m × n grey blocks；
Being merged with original slice images by image after interpolation, the step obtaining adaptive sectioning image includes:
The gray value of each pixel of gray level image after scanning interpolation successively, skips the next picture of scanning when gray value is less than 25
Vegetarian refreshments, when gray value is more than or equal to 25, obtains the gray value of this pixel, and this gray value is assigned to original image section
Same pixel position, draw adaptive sectioning image.
Method the most according to claim 1, it is characterised in that step 100 includes:
From the beginning of GTG is 25, generate what the Attribute Relative of a secondary sectioning image gone out with projector was answered every 10 GTGs
The image of same grayscale, until till generating the image of same grayscale that GTG is 255, constituting the phase of a series of different GTG
Image with gray scale.
6. the system combining distribution of light sources and the face exposure 3D printing of reflection characteristic, it is characterised in that include with lower module:
Data measurement module, data analysis module, the suitableeest power determination module and data fusion module；
Described data measurement module is arranged to: first have to generate to go out with projector the Attribute Relative of sectioning image answer
The same gray level image of a series of different GTGs, and by figure that each width image division is the diverse location that m × n area is identical
As sub-block, then we need successively the image subblock divided to be carried out illumination in the case of light source front has resin storage tank to block
Power measurement；
Described data analysis module is arranged to: obtain measured illumination power data from described measurement module, to each position
The illumination power data that each image subblock measurement under putting obtains is analyzed, and obtains resin storage tank on the impact of illumination and without resin
Illumination patterns in the case of groove, when then obtaining having resin storage tank to block, the illumination power of the image subblock under each position is with ash
The rule of degree change；
The suitableeest described power determination module is arranged to: the section of a model to be printed is all overlapped on a figure, its
Middle white is for having model where, and black is the region not having model, obtains all from described data analysis module
The luminous power of the image subblock under position is with the rule of grey scale change, according to the luminous power of the image subblock under all positions with ash
The rule of degree change determines the suitableeest power, and searches gray value corresponding with this suitableeest power in each image subblock, simultaneously
Our default setting black is that the gray scale in the region not having model is minimum, then the half-tone information of all of sub-block is preserved
Matrix for the gray value information of corresponding m × n；
Described fusion treatment module is arranged to: obtain the matrix of the gray value information of described m × n from the suitableeest power determination module,
The matrix of the gray value information according to m × n generates the figure that comprise m × n grey blocks consistent with the attribute of original slice images
Picture, carries out interpolation processing to the image comprising m × n grey blocks, is then carried out with original slice images by the image after interpolation
Merge, obtain adaptive sectioning image.
System the most according to claim 6, it is characterised in that described data analysis module is specifically arranged to:
The illumination power data obtaining the image subblock measurement of the different gray scales under each position carries out Fourier analysis,
To the ultraviolet light irradiation degree of image subblock of this position with grey scale change Changing Pattern；
The ultraviolet light irradiation degree of the image subblock according to this position, with grey scale change Changing Pattern, determines image under this position
Block is 25 to the data that gray scale is ultraviolet light irradiation degree corresponding to 255 from gray scale, save as the gray scale corresponding with this position and
The data pair of ultraviolet light irradiation degree.
System the most according to claim 6, it is characterised in that the suitableeest described power determination module is specifically configured to:
The ultraviolet light irradiation degree of the image subblock according to all of m × n position, with the rule of grey scale change, chooses all sections
White portion tires out the minima in the illumination power data that the sub-block in folded region is corresponding under maximum gray scale as the suitableeest merit
Rate, the gray scale being provided with black sub-block correspondence position is minimal gray；
According to the suitableeest power determined, for the image subblock of each position, in the gray scale corresponding with this position preserved
Data centering with ultraviolet light irradiation degree is found and the immediate luminous power of the suitableeest power, by these immediate luminous power data pair
The gray scale output answered, preserves into the gray value information of a m × n corresponding with the image subblock of m × n by the gray value of output
Matrix.
System the most according to claim 6, it is characterised in that described data fusion module is set to by following manner root
The figure that comprise m × n grey blocks consistent with the attribute of original slice images is generated according to the matrix of the gray value information of m × n
Picture:
Attribute according to section generates the gray level image comprising m × n identical image unit for interpolation；Scanning is protected successively
The matrix of the gray value information of the m × n deposited, each gray value be assigned in the gray level image of interpolation right
Answer elementary area, thus generate the gray level image comprising m × n grey blocks；
Described data fusion module is set to the image after interpolation and original slice images be merged by following manner,
Obtain combining the adaptive sectioning image of distribution of light sources and reflection characteristic:
The gray value of each pixel of gray level image after scanning interpolation successively, skips the next picture of scanning when gray value is less than 25
Vegetarian refreshments, when gray value is more than or equal to 25, obtains the gray value of this pixel, and this gray value is assigned to original image section
Same pixel position, draw adaptive sectioning image.
System the most according to claim 6, it is characterised in that described data analysis module is specifically arranged to:
Wherein, described data measurement module is arranged through following manner and generates the sectioning image attribute phase gone out with projector
The image of the same gray scale of corresponding a series of different GTGs:
From the beginning of GTG is 25, generate what the Attribute Relative of a secondary sectioning image gone out with projector was answered every 10 GTGs
The image of same grayscale, until till generating the image of same grayscale that GTG is 255, constituting the phase of a series of different GTG
Image with gray scale.
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