CN110177262A - A kind of projection accelerated method, system and device based on bit depth segmentation - Google Patents
A kind of projection accelerated method, system and device based on bit depth segmentation Download PDFInfo
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Abstract
The present invention provides a kind of projection accelerated method, system and devices based on bit depth segmentation, belong to computer graphics field, and this method is by 2nThe single channel brightness value of rank n bit depth image is divided into the sum of high n-i and low i two parts, with 2(n‑i)The light-source brightness irradiation micro mirror of unit generates n-i high, generate low i with the light-source brightness of 1 unit irradiation micro mirror, thus under the premise of not reducing picture quality, reduce single channel it is n-i high needed for overturning periodicity, and then the projection period of whole image is reduced, promote projection speed.Projection accelerated method, system and device of the invention does not need to reduce image bit depth and can be realized to project to accelerate, it realizes and accelerates that picture quality will not be reduced while projection, and it is suitable for the various bit depth image sequences of different numbers of channels, it has broad application prospects.
Description
Technical field
The invention belongs to computer graphics fields, accelerate more particularly, to a kind of projection based on bit depth segmentation
Method, system and device.
Background technique
With increasingly extensive and the degree of automation the further increasing of computer picture application, computer is in Industrial Measurement
There is irreplaceable role in amount field.Three-dimensional depth information is completed by the task of system and performance is most important, but passes
What optical imagery handled by the computer of system reflected is the light-source brightness and colouring information of scene, the three-dimensional being lost in reality
Depth information.With the development of three-dimensional measurement sensor, multifrequency phase shifting method is used widely, mainly three frequency four-step phase-shiftings
Method, the speed of measurement depend on the speed of projection device and camera synchronize the speed that is acquired, mainstream industry at present
The bottleneck of camera is all to project speed substantially.
Projection arrangement DLP (Digital Light Processing) more advanced now and traditional projection arrangement compare
There are following characteristics:
(1) it is imaged using reflection mode, the formation of image is miniature by DMD (Digital Micromirror Device)
The overturning of reflection mirror array (abbreviation micro mirror array) realizes, has the characteristics that primary contrast is high, machine miniaturization, projection speed
Degree and resolution ratio are all higher；
(2) gray level image is generated by way of integral, different gray scales corresponds to different overturning duty ratios, and project
Highest frame per second then depends on the frequency of micro mirror overturning；
(3) modulation of up to 4 light source channels (R-G-B-IR, i.e. red-green-blue-are infrared) can be carried out；Have
The channel IR can replace with W channel (white, white light) in DLP equipment, for adjusting display brightness (such as the environment light of RGB image
Needing to lighten in picture when stronger can just see), the saturation degree of RGB image can be reduced due to promoting display brightness, leads to figure
The decline of image quality amount, the DLP of some types can disable or remove the channel IR or W channel；Different, each light source channel according to DLP type
It can be projected with independent projections or rotation.
The task of gray modulation is completed jointly by light source and micro mirror, and the feasible solution for promoting projection speed is exactly to reduce
The overturning period of micro mirror.And if the bit depth of projected image can be reduced, micro mirror will be reduced and turn over cycle turnover, with harvest
Faster projection speed, or even by required compression of images to preload space memory capacity limitation within, it is maximum to realize
Project speed.But 2m1 rank width of bit depth figure is equivalent to 2nThe 2 of 1 rank width of bit depth figuren-mTimes, n > m, 2mBit depth
1 unit brightness of figure also corresponds to 2nThe 2 of 1 unit brightness of bit depth figuren-mTimes, therefore, reducing image bit depth will lead to figure
As the sharp fall of color range, decline to a great extent so as to cause picture quality.For example, 8 bit depth single channel grayscale images have 256 ranks
Gray scale, and 7 bit depth single channel grayscale images only have the gray scale of 128 ranks, during constituting sinusoidal grating, 7 gray scales
Image will have than the 8 more serious sawtooth of grayscale image, to influence the precision of measurement.
For this purpose, needing a kind of method for being able to ascend projection speed and not reducing picture quality.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of projections based on bit depth segmentation
Accelerated method, system and device, it is intended that by 2nThe single channel brightness value of rank n bit depth image be divided into high n-i and
The sum of low i two parts, with 2(n-i)The light-source brightness irradiation micro mirror generation of unit is n-i high, is irradiated with the light-source brightness of 1 unit
Micro mirror generates low i, thus under the premise of not reducing picture quality, reduce single channel it is n-i high needed for the overturning period
Number, and then the projection period of whole image is reduced, promote projection speed.
To achieve the above object, according to one aspect of the present invention, provide it is a kind of based on bit depth segmentation projection add
Fast method, the acceleration for DLP projection arrangement project, and the light that light source emits is reflected into correspondence by the micro mirror of note DLP projection arrangement
Location of pixels when, the state of micro mirror is 1, and otherwise the state of micro mirror is 0, then individually in the overturning period state of micro mirror be 1 or
0, for the image to be projected of n bit depth, the projection accelerated method the following steps are included:
S101, by the 2 of single channelnRank brightness NAlwaysIt is divided into the sum of high n-i and low i two parts brightness, i >=2 n >,
It is denoted as:
NAlways=NIt is high+NIt is low
In formula, NAlwaysIt is 0~2nArbitrary integer between -1, NIt is highIndicate high n-i brightness, NIt is lowIndicate low i brightness；High n-
I brightness handle to obtain according to step S102, and low i brightness handles to obtain according to step S103；
S102, under corresponding channel, with 2(n-i)The light-source brightness of unit is irradiated, and needs the overturning week that 1 state is 1
Phase can generate 1 flat light source 2(n-i)The luminous flux in a period, the overturning periodic brightness variable quantity that each state is 1 at this time are
2(n-i)Rank generates high n-i of brightness N to carry out brightness accumulation by overturning micro mirrorIt is high；
S103, under corresponding channel, be irradiated with the light-source brightness of 1 unit, need 2iThe overturning period that a state is 1
It can produce 1 flat light source 2iThe luminous flux in a period, the overturning periodic brightness variable quantity that each state is 1 at this time is 1 rank, from
And brightness accumulation is carried out by overturning micro mirror, generate low i of brightness NIt is low。
Further, in step S101,
NAlways=X × 2(n-i)The flat light source brightness flat light source brightness of+Y × 1
NIt is high=X × 2(n-i)Flat light source brightness
NIt is lowThe flat light source brightness of=Y × 1
In formula, X is under corresponding channel, with 2(n-i)When the light-source brightness of unit is irradiated, required micro mirror state is 1
Overturning periodicity,
Y is under corresponding channel, and when being irradiated with the light-source brightness of 1 unit, the overturning that required micro mirror state is 1 is all
Issue；
The N of corresponding channelAlwaysWhen=0, needing state of the micro mirror under corresponding channel in all rollovers period is 0, at this time X
=0, Y=0.
Further, which includes the following steps:
Step 1: for the image of a frame n bit depth, according to step S101~S103 under all channels in the image
The brightness of all pixels is decomposed, and calculates the value of corresponding X, Y；
Step 2: for single channel, first with 2(n-i)The light-source brightness of unit irradiates all micro mirrors 2(n-i)- 1 overturning week
Phase, then all micro mirrors 2 are irradiated with the light-source brightness of 1 uniti- 1 overturning period, in which:
NAlwaysState of the corresponding micro mirror of=0 pixel within all rollovers period is 0；
The corresponding micro mirror of the pixel of X=0 and Y > 1, preceding 2(n-i)Micro mirror state is 0 in -1 overturning period；Rear
2iHaving Y overturning period micro mirror state in -1 overturning period is 1,2i- 1-Y overturning period micro mirror states are 0；
The corresponding micro mirror of the pixel of X > 1 and Y=0, preceding 2(n-i)There is X overturning period micro mirror shape in -1 overturning period
State is 1,2(n-i)- 1-X overturning period micro mirror states are 0；Rear 2iMicro mirror state is 0 in -1 overturning period；
The corresponding micro mirror of the pixel of X > 1 and Y > 1, preceding 2(n-i)There is X overturning period micro mirror shape in -1 overturning period
State is 1,2(n-i)- 1-X overturning period micro mirror states are 0；Rear 2iThere is Y overturning period micro mirror state in -1 overturning period
It is 1,2i- 1-Y overturning period micro mirror states are 0.
Further, which includes the following steps:
Step 1: for the image of a frame n bit depth, according to step S101~S103 under all channels in the image
The brightness of all pixels is decomposed, and calculates the value of corresponding X, Y；
Step 2: for single channel, all micro mirrors 2 first being irradiated with the light-source brightness of 1 uniti- 1 overturning period, then with
2(n-i)The light-source brightness of unit irradiates all micro mirrors 2(n-i)- 1 overturning period, in which:
NAlwaysState of the corresponding micro mirror of=0 pixel within all rollovers period is 0；
The corresponding micro mirror of the pixel of X=0 and Y > 1, preceding 2iThere is Y overturning period micro mirror state in -1 overturning period
It is 1,2i- 1-Y overturning period micro mirror states are 0；Rear 2(n-i)Micro mirror state is 0 in -1 overturning period；
The corresponding micro mirror of the pixel of X > 1 and Y=0, preceding 2iMicro mirror state is 0 in -1 overturning period；Rear 2(n -i)Having X overturning period micro mirror state in -1 overturning period is 1,2(n-i)- 1-X overturning period micro mirror states are 0；
The corresponding micro mirror of the pixel of X > 1 and Y > 1, preceding 2iThere is Y overturning period micro mirror state in -1 overturning period
It is 1,2i- 1-Y overturning period micro mirror states are 0；Rear 2(n-i)There is X overturning period micro mirror state to be in -1 overturning period
1,2(n-i)- 1-X overturning period micro mirror states are 0.
Further, when n is even number, i=n/2, i >=2；When n is odd number, i=(n ± 1)/2, i >=2.
To achieve the above object, other side according to the invention provides a kind of projection based on bit depth segmentation
Acceleration system, including processor and projection accelerate program module；The projection accelerates program module by the processor tune
Used time executes foregoing projection accelerated method.
To achieve the above object, other side according to the invention provides a kind of DLP throwing based on bit depth segmentation
Image device, including micro mirror array, light source, projection lens and processor, micro mirror array is by multiple micro mirror groups that can independently overturn
At the light for emitting light source reflexes to the designated position of projection lens, and processor is for controlling light-source brightness and control
The flip angle of each micro mirror, within the individually overturning period, when the light that light source emits is reflexed to the designated position of projection lens
The state of micro mirror is denoted as 1, and otherwise the state of micro mirror is 0, further includes that projection accelerates program module；The projection accelerates program module
When being called by the processor, foregoing projection accelerated method is executed.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial to effect
Fruit:
(1) present invention is by by the 2 of the single channel of n bit depth imagenRank brightness is decomposed into high n-i brightness and low i
The mode of the sum of position brightness, utilizes 2(n-i)The light-source brightness of unit generates the 2 of high n-i(n-i)Rank greyscale pattern utilizes 1 unit
Light-source brightness generate low i 2iRank greyscale pattern, so that the overturning period that high n-i of every rank grey scale change occupies be subtracted
Less it is 1, and then reduces the total overturning periodicity occupied needed for single channel projection, while bit depth will not be reduced, thus
Realize that projection accelerates under the premise of not reducing picture quality.
(2) the 2 of traditional single channel of n bit depth imagenRank brightness needs to occupy 2n- 1 overturning period could indicate 0
~2n- 1 totally 2nRank brightness change.And low i of the single channel of method of the invention needs to occupy 2i- 1 overturning period, and high n-i
Position only needs to occupy 2(n-i)- 1 overturning period, therefore single channel needs 2 in total(n-i)+2i- 2 overturning periods can indicate 0
~2n- 1 totally 2nRank brightness change, overturning total number of cycles needed for greatly reducing the single channel projection of a frame image, but deposit
Total bit depth of storage image does not change.
(3) in the present invention, the value of i determines the efficiency of projection, and when n is even number, i=n/2 can make projection imitate
Rate maximizes；When n is odd number, i=(n ± 1)/2 can make projection efficiency maximize.
(4) present invention need to only change light source and the control program of micro mirror overturning and can be realized, without changing the structure of existing DLP
It makes, therefore easy to spread, does not increase additional scrap build cost.
(5) present invention is applicable not only to the projection of RGB image, is equally applicable to the projection of grayscale image, logical according to DLP equipment
The difference of road type can both carry out grayscale image projection using the solution of the present invention under white light channel, can also be logical by RGB
The projection of trace-stacking realization grayscale image.
(6) present invention accelerates due to not needing to reduce image bit depth and can be realized to project, that is, realizes and accelerate the same of projection
Shi Buhui generates sawtooth, is particularly suitable for the occasion for needing to carry out accurate measurement using grayscale image.
(7) method of the invention is suitable for the various bit depth image sequences of different numbers of channels, has wide application
Prospect.
Detailed description of the invention
Fig. 1 is a kind of key step flow chart of the method for the promotion projection speed based on bit depth segmentation of the present invention；
Fig. 2 is the flow chart of the embodiment of the present invention 1；
Fig. 3 is the flow chart of the embodiment of the present invention 2；
Fig. 4 is the flow chart of the embodiment of the present invention 3.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
It is of the invention for ease of understanding, need first some basic principles to existing DLP projection arrangement and the course of work to carry out
It introduces:
DLP is the abbreviation of " Digital Light Processing ", is literal translated as digital light processing, i.e., first to be projected
Original image processing is digital signal, and light is then projected into image according to digital signal again.The core devices of DLP are DMD
(Digital Micromirror Device, digital micro-mirror chip, abbreviation micro mirror array), is by fixed angles largely may be reversed
The reflection mirror array of the micro mirror composition of degree, the corresponding pixel of each micro mirror in micro mirror array.Its basic projection theory is
The light of needs is reflexed into projection lens by micro mirror, and unwanted light is reflexed into light absorber and is absorbed, thus real
The projection of existing image, and its reflection direction is realized by control micro mirror angle.Therefore, the light source of DLP projection arrangement
It adjusts and pattern formation operates respectively.
The micro mirror angle of general DMD has+12 °, 0 °, -12 ° of three gear, and 0 ° is initial position, and reflected light is towards projection at+12 °
Camera lens, is denoted as "ON" or " 1 ", and reflected light is denoted as "Off" or " 0 " towards light absorber at -12 °.It is micro- within an overturning period
The state of mirror is only 1 or 0, i.e., micro mirror angle or is+12 ° or is -12 °.
The pattern formation of DLP is based on rgb color mode, and rgb value is exactly the brightness of tri- respective colors in channel of RGB,
It is to be realized in a manner of light-source brightness integral in DLP.For 16,000,000 color DLP (i.e. for exporting 8 bit depth figures
DLP), respectively there is 0~255 totally 256 rank in tri- channels RGB.Existing DLP projecting method be according to the rgb value of pixel to be projected,
Corresponding micro mirror is irradiated under corresponding RGB channel with the light-source brightness of constant 1 unit strength, light source is every to be reflected by micro mirror
Primary to projection lens, then corresponding location of pixels accumulates the light-source brightness of 1 unit, and rgb value is equal to micro mirror under corresponding RGB channel
The overturning periodicity that state is 1.For example, the pixel that rgb value is 255,120,50 indicates that corresponding micro mirror occupies under the channel R
Overturning period that 255 states are 1 occupies under the channel G and occupies 50 shapes under the overturning period, channel B that 120 states are 1
The overturning period that state is 1.
In computer picture field, single channel image refers in particular to grayscale image, and (note: single channel is different from single channel, " single-pass
Road image " is fixed term), the channel luminance of grayscale image is known as gray scale.Utilize DLP projection gray level figure, it is only necessary to will be projected out
The rgb value of pixel be set as equal with the gray scale of respective pixel in original single channel image.For example, original 8 bit depth list
The pixel that gray scale is 76 in channel image, corresponding rgb value is 76,76,76 when being projected using DLP.
Since the brightness maxima in tri- channels RGB of 8 bit depth figures is that 255, RGB triple channel respectively needs 1 unit
Light-source brightness is accumulated 255 times, and therefore, each channel at least needs 255 overturning periods that could indicate corresponding 0~255 totally 256
Rank brightness.According to existing DLP type, three channels can simultaneously or alternately be irradiated.If RGB triple channel is irradiated simultaneously,
The minimum RGB figure or grayscale image for needing 255 overturning periods that could show 8 bit depth.
For each channel of DLP, in 255 overturning periods, the overturning periodicity that micro mirror state is 1 determines this
The brightness in channel, existing DLP be it is constant be irradiated with 1 flat light source brightness, for example, micro mirror state is 1 to turn under the channel R
The turn-week phase has 76, and micro mirror state is 0 in remaining overturning period, then the R channel luminance of the corresponding pixel of the micro mirror is 76；255
Micro mirror state is all 0 in a overturning period, then the corresponding R channel luminance of the micro mirror is 0.Assuming that the frequency of micro mirror overturning is
1020Hz, all channels project simultaneously, then the frame per second for projecting 8 bit depth images is 1020Hz ÷ 255=4Hz.
The method for carrying out projection acceleration by compression bit depth is as follows, and bit depth is compressed to 7 by 8, then single logical
The brightness in road is by 256 rank boil down to, 128 rank, so that overturning periodicity is reduced to 127 from 255.The frame per second projected at this time
It is promoted to 1020Hz ÷ 127=8.03Hz, projection speed improves 1 times.But due to compression after brightness can only as unit of 2 into
Row variation, obtained picture quality then decline to a great extent, and can obviously see sawtooth, compression multiplying power is higher, and image quality decrease is got over
Greatly.
Based on the basic principle of above-mentioned DLP and DMD, in order to keep bit depth constant while being promoted and projecting speed, i.e.,
Picture quality is kept not decline, as shown in Figure 1, the invention proposes following schemes:
For the image to be projected of n bit depth, the projection accelerated method the following steps are included:
S101, by the 2 of single channelnRank brightness NAlwaysIt is divided into the sum of high n-i and low i two parts brightness, i >=2 n >,
It is denoted as:
NAlways=NIt is high+NIt is low
In formula, NAlwaysIt is 0~2nArbitrary integer between -1, NIt is highIndicate high n-i brightness, NIt is lowIndicate low i brightness；High n-
I brightness handle to obtain according to step S102, and low i brightness handles to obtain according to step S103；
If directly indicating the brightness in single channel using light-source brightness, have:
NAlways=X × 2(n-i)The flat light source brightness flat light source brightness of+Y × 1
NIt is high=X × 2(n-i)Flat light source brightness
NIt is lowThe flat light source brightness of=Y × 1
In formula, X is under corresponding channel, with 2(n-i)When the light-source brightness of unit is irradiated, required micro mirror state is 1
Overturning periodicity, the value of X has 0~2(n-i)- 1 totally 2(n-i)Rank；
Y is under corresponding channel, and when being irradiated with the light-source brightness of 1 unit, the overturning that required micro mirror state is 1 is all
The value of issue, Y has 0~2i- 1 totally 2iRank；
The N of corresponding channelAlwaysWhen=0, needing state of the micro mirror under corresponding channel in all rollovers period is 0, at this time X
=0, Y=0.
S102, under corresponding channel, with 2(n-i)The light-source brightness of unit is irradiated, and needs the overturning week that 1 state is 1
Phase can generate 1 flat light source 2(n-i)The luminous flux in a period, the overturning periodic brightness variable quantity that each state is 1 at this time are
2(n-i)Rank, to generate high n-i of brightness NIt is high；
S103, under corresponding channel, be irradiated with the light-source brightness of 1 unit, need 2iThe overturning period that a state is 1
It can produce 1 flat light source 2iThe luminous flux in a period, the overturning periodic brightness variable quantity that each state is 1 at this time is 1 rank, from
And generate low i of brightness NIt is low。
The above method according to the invention, high n-i only needs to occupy 2(n-i)In -1 overturning period, low i then needs to account for
According to 2i- 1 overturning period, therefore can be by the total projection cycle reduction in single channel to 2(n-i)+2i- 2.Wherein, step
The sequencing of S102 and S103 can be exchanged.
Distinguishingly, when n is even number, i=n/2 can make projection efficiency maximize；When n is odd number, i=(n ±
1)/2 can projection efficiency be maximized.
Method of the invention is further described below with reference to several specific embodiments:
[embodiment 1] n is even number, i=n/2.
As shown in Fig. 2, a kind of method of promotion projection speed based on bit depth segmentation of the present embodiment, including following step
It is rapid:
S101, by the single channel 2 of n bit depth imagenRank brightness NAlwaysIt is divided into high n/2 and low n/2 two parts is bright
Spend NIt is high、NIt is lowThe sum of:
NAlways=X × 2(n/2)The flat light source brightness flat light source brightness of+Y × 1
NIt is high=X × 2(n/2)Flat light source brightness
NIt is lowThe flat light source brightness of=Y × 1
In formula, X is under corresponding channel, with 2(n/2)When the light-source brightness of unit is irradiated, required micro mirror state is 1
Overturning periodicity,
Y is under corresponding channel, and when being irradiated with the light-source brightness of 1 unit, the overturning that required micro mirror state is 1 is all
Issue；
The N of corresponding channelAlwaysWhen=0, needing state of the micro mirror under corresponding channel in all rollovers period is 0, at this time X
=0, Y=0.
S102, for n/2 high, with 2(n/2)The light-source brightness of unit is irradiated, and 1 overturning period can generate 1
Flat light source irradiation lower 2(n/2)The luminous flux in a overturning period, therefore high n/2 of brightness change has 2(n/2)Grade total [2(n/2)-1]
×2(n/2)Rank needs to occupy 2 altogether(n/2)In -1 overturning period, micro mirror state is 1 or 0 in each overturning period, each overturning
The luminance delta in period is 2(n/2), so as to carry out brightness accumulation by overturning micro mirror, generate high n/2 of brightness.
S103, for n/2 low, be irradiated with the light-source brightness of 1 unit, 1 overturning period can generate 1 unit
The luminous flux of light-source brightness, therefore low n/2 of brightness change has 2(n/2)Rank needs to occupy 2 altogether(n/2)- 1 overturning period, often
Micro mirror state is 1 or 0 in a overturning period, and the luminance delta in each overturning period is 1 rank, so as to micro- by overturning
Mirror carries out brightness accumulation, generates low n/2 of brightness.
Single channel is directed in the present embodiment, when with 2(n/2)When flat light source brightness carries out illumination irradiation, overturn at one
It is exactly the 2 of the channel illumination irradiation of 1 flat light source brightness in period(n/2)Times, it is single in this way under conditions of illumination total amount is certain
Overturning total number of cycles needed for a channel projection will greatly reduce, under multi-channel projection mode, overturning needed for all channels
Total number of cycles can similarly greatly reduce.Therefore, under the strategy that bit depth of the invention is divided, either single channel image is thrown
Shadow or multichannel image projection, the speed of projection can get a promotion.
[embodiment 2] 8 grayscale images, n=8, i=4.
As shown in Fig. 3 and table 1, for 8 grayscale images, high 4 represent 0~15 totally 16 grades of grey scale changes, need
15 overturning periods are occupied to realize, the overturning period grey scale change amount that each state is 1 is 16 ranks；And low 4 also generations
The totally 16 grades of grey scale changes of table 0~15, need to occupy 15 overturning periods realizing, the overturning period ash that each state is 1
Degree variable quantity is 1 rank.
18 grayscale images of table, 256 rank Intensity segmentation schematic table
Since light source and the pattern formation of DLP projection arrangement operate respectively, we can be by 256 rank gray level images
Generation is divided into 2 parts, generates high 4 15 rank greyscale patterns with the light-source brightness of 16 units, and with the light-source brightness of 1 unit
Generate low 4 16 rank greyscale patterns.When being irradiated with the light source of 16 units, 1 micro mirror period is only needed, so that it may generate 1
The luminous flux in 16 periods of flat light source.By taking 1 pixel as an example, it is represented in binary as if its gray value is 76,8
01001100, then its high four are 0100=4, i.e. X=4, and low four are 1100=12, i.e. Y=12.
In order to generate the gray scale, according to traditional DLP projecting method, either white channel (gray=76) or RGB
Channel (R=76, G=76, B=76), single channel are required to 255 overturning periods, wherein micro mirror shape in 76 overturning periods
State is 1, and micro mirror state is 0 in remaining 179 overturning periods.Under bit depth segmentation strategy of the invention, then single channel only
30 overturning periods are needed, preceding 15 periods are irradiated with the light-source brightness of 16 units, wherein micro- in X=4 overturning period
Specular state is 1, and rear 15 periods are irradiated with the light-source brightness of 1 unit, and wherein micro mirror state is in Y=12 overturning period
1, then being calculated according to luminous flux, the brightness value that single channel generates in this 30 periods are as follows:
+ 12 × 1 (period) × 1 (light-source brightness) of 76=4 × 1 (period) × 16 (light-source brightness)
In the present embodiment, by the projection period in the single channel of 8 gray level images from 255 overturning cycle reductions to 30
A, projection speed improves 8.5 times.The present embodiment illumination sequence can exchange, i.e., can also former 15 periods with 1 unit
Light-source brightness is irradiated, wherein micro mirror state is 1 in 12 overturning periods, first generates low 4 greyscale patterns；15 week afterwards
Phase is irradiated with the light-source brightness of 16 units, wherein micro mirror state is 1 in 4 overturning periods, to generate high 4 bit patterns.
For 8 RGB images (being commonly called as 16,000,000 colors or 16,780,000 chromatic graph pictures), equally can according to the table 1 of the present embodiment,
The brightness (i.e. rgb value) in each channel is split according to the Intensity segmentation method in single channel, illuminating method, micro mirror overturning
Method similarly, repeats no more.
[embodiment 3] 4 bit depth image, n=4, i=2.
As shown in Fig. 4 and table 2, the 16 rank brightness in the single channel of 4 bit depth images are split as high 2 and low 2 two
Part, high 2 represent 0~3 totally 4 grades of brightness changes, need to occupy 3 overturning periods to realize, each state is 1
Overturning periodic brightness variable quantity is 4 ranks；And low 2 also represent 0~3 totally 4 grades of grey scale changes, need to occupy 3 overturning periods
It realizes, the overturning periodic brightness variable quantity that each state is 1 is 1 rank.
24 bit depth Figure 16 rank Intensity segmentation schematic table of table
High 24 grades of grey scale changes need 1 overturning period if being irradiated with the light-source brightness of 4 units
The luminous flux in 14 periods of flat light source is generated, micro mirror state is 1 or 0 in each overturning period, each overturning period
Brightness change is 4 ranks, needs to occupy 3 overturning periods, generates high 24 rank greyscale patterns；Similarly low 24 grades of gray scales become
Change, need to occupy 3 overturning periods, the brightness change in each overturning period is 1 rank, is shone with the light-source brightness of 1 unit
It penetrates, needs 3 overturning periods to can produce low 24 rank grey scale changes, the micro mirror state in each overturning period is 1 or 0.
The overturning period of micro mirror is reduced to 6 by 15 in the present embodiment, and projection speed improves 2.5 times.
It should be noted that the light-source brightness of 4 bit depth Fig. 1 units is equivalent to the light-source brightness of 8 bit depth Fig. 1 units
28-4=16 times, therefore, the variation degree of the every rank brightness of 4 bit depth figures is huge, and clearly, the present invention can promote 4 to sawtooth
While bit depth figure projects speed, the quality of 4 bit depth figures is avoided further to decline.
Through the foregoing embodiment it is appreciated that the fast projection that the present invention is suitable for various bit depth images is handled, such as 7
Bit depth, 10 bit depth, 16 bit depth etc., the projection acceleration operating method and principle of bit depths are not identical, and difference is only
It is the value of n, i, the value of n, i is directly substituted into method of the invention, under the premise of meeting n > i >=2, n is even
Number, odd number do not influence realization of the invention.In addition, as can be seen from the above embodiments, the bit depth of original image is bigger, of the invention
Projection speed-increasing effect is more obvious.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of projection accelerated method based on bit depth segmentation, the acceleration for DLP projection arrangement is projected, note DLP projection dress
When the light that light source emits is reflected into corresponding location of pixels by the micro mirror set, the state of micro mirror is 1, and otherwise the state of micro mirror is 0,
Then individually the state of micro mirror is 1 or 0 in the overturning period, which is characterized in that for the image to be projected of n bit depth, which adds
Fast method the following steps are included:
S101, by the 2 of single channelnRank brightness NAlwaysIt is divided into the sum of high n-i and low i two parts brightness, i >=2 n > are denoted as:
NAlways=NIt is high+NIt is low
In formula, NAlwaysIt is 0~2nArbitrary integer between -1, NIt is highIndicate high n-i brightness, NIt is lowIndicate low i brightness；High n-i bright
Degree handles to obtain according to step S102, and low i brightness handles to obtain according to step S103；
S102, under corresponding channel, with 2(n-i)The light-source brightness of unit is irradiated, and needs the overturning period that 1 state is 1 just
It can produce 1 flat light source 2(n-i)The luminous flux in a period, the overturning periodic brightness variable quantity that each state is 1 at this time is 2(n -i)Rank generates high n-i of brightness N to carry out brightness accumulation by overturning micro mirrorIt is high；
S103, under corresponding channel, be irradiated with the light-source brightness of 1 unit, need 2iThe overturning period that a state is 1 can be with
Generate 1 flat light source 2iThe luminous flux in a period, the overturning periodic brightness variable quantity that each state is 1 at this time is 1 rank, thus logical
It crosses overturning micro mirror and carries out brightness accumulation, generate low i of brightness NIt is low。
2. a kind of projection accelerated method based on bit depth segmentation as described in claim 1, which is characterized in that step S101
In,
NAlways=X × 2(n-i)The flat light source brightness flat light source brightness of+Y × 1
NIt is high=X × 2(n-i)Flat light source brightness
NIt is lowThe flat light source brightness of=Y × 1
In formula, X is under corresponding channel, with 2(n-i)When the light-source brightness of unit is irradiated, required micro mirror state is 1 to turn over
Turn-week issue,
Y be under corresponding channel, when being irradiated with the light-source brightness of 1 unit, required micro mirror state be 1 the overturning period
Number；
The N of corresponding channelAlwaysWhen=0, needing state of the micro mirror under corresponding channel in all rollovers period is 0, at this time X=0,
Y=0.
3. a kind of projection accelerated method based on bit depth segmentation as claimed in claim 2, which is characterized in that including walking as follows
It is rapid:
Step 1: for the image of a frame n bit depth, owning according to step S101~S103 under all channels in the image
The brightness of pixel is decomposed, and calculates the value of corresponding X, Y；
Step 2: for single channel, first with 2(n-i)The light-source brightness of unit irradiates all micro mirrors 2(n-i)- 1 overturning period, then
All micro mirrors 2 are irradiated with the light-source brightness of 1 uniti- 1 overturning period, in which:
NAlwaysState of the corresponding micro mirror of=0 pixel within all rollovers period is 0；
The corresponding micro mirror of the pixel of X=0 and Y > 1, preceding 2(n-i)Micro mirror state is 0 in -1 overturning period；Rear 2i- 1
Having Y overturning period micro mirror state in the overturning period is 1,2i- 1-Y overturning period micro mirror states are 0；
The corresponding micro mirror of the pixel of X > 1 and Y=0, preceding 2(n-i)There is X overturning period micro mirror state to be in -1 overturning period
1,2(n-i)- 1-X overturning period micro mirror states are 0；Rear 2iMicro mirror state is 0 in -1 overturning period；
The corresponding micro mirror of the pixel of X > 1 and Y > 1, preceding 2(n-i)There is X overturning period micro mirror state to be in -1 overturning period
1,2(n-i)- 1-X overturning period micro mirror states are 0；Rear 2iHaving Y overturning period micro mirror state in -1 overturning period is 1,
2i- 1-Y overturning period micro mirror states are 0.
4. a kind of projection accelerated method based on bit depth segmentation as claimed in claim 2, which is characterized in that including walking as follows
It is rapid:
Step 1: for the image of a frame n bit depth, owning according to step S101~S103 under all channels in the image
The brightness of pixel is decomposed, and calculates the value of corresponding X, Y；
Step 2: for single channel, all micro mirrors 2 first being irradiated with the light-source brightness of 1 uniti- 1 overturning period, then with 2(n-i)
The light-source brightness of unit irradiates all micro mirrors 2(n-i)- 1 overturning period, in which:
NAlwaysState of the corresponding micro mirror of=0 pixel within all rollovers period is 0；
The corresponding micro mirror of the pixel of X=0 and Y > 1, preceding 2iHaving Y overturning period micro mirror state in -1 overturning period is 1,
2i- 1-Y overturning period micro mirror states are 0；Rear 2(n-i)Micro mirror state is 0 in -1 overturning period；
The corresponding micro mirror of the pixel of X > 1 and Y=0, preceding 2iMicro mirror state is 0 in -1 overturning period；Rear 2(n-i)- 1
Having X overturning period micro mirror state in the overturning period is 1,2(n-i)- 1-X overturning period micro mirror states are 0；
The corresponding micro mirror of the pixel of X > 1 and Y > 1, preceding 2iHaving Y overturning period micro mirror state in -1 overturning period is 1,
2i- 1-Y overturning period micro mirror states are 0；Rear 2(n-i)Having X overturning period micro mirror state in -1 overturning period is 1,2(n-i)- 1-X overturning period micro mirror states are 0.
5. a kind of projection accelerated method based on bit depth segmentation as described in Claims 1 to 4 any one, feature exist
In, when n is even number, i=n/2, i >=2；When n is odd number, i=(n ± 1)/2, i >=2.
6. a kind of projection acceleration system based on bit depth segmentation, which is characterized in that accelerate program including processor and projection
Module；The projection accelerates program module when being called by the processor, executes as described in Claims 1 to 5 any one
Projection accelerated method.
7. a kind of DLP projection arrangement based on bit depth segmentation, including micro mirror array, light source, projection lens and processor, micro-
Lens array is made of multiple micro mirrors that can independently overturn, and the light for emitting light source reflexes to the designated position of projection lens,
Processor is used to control light-source brightness and the flip angle of each micro mirror of control emits light source within the individually overturning period
Light when reflexing to the designated position of projection lens the state of micro mirror be denoted as 1, otherwise the state of micro mirror is 0, which is characterized in that also
Accelerate program module including projection；The projection accelerates program module when being called by the processor, executes such as claim 1
Projection accelerated method described in~5 any one.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117676107A (en) * | 2024-01-31 | 2024-03-08 | 武汉中观自动化科技有限公司 | Image laser projection method and laser projection device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275271B1 (en) * | 1999-03-04 | 2001-08-14 | Matsushita Electric Industrial Co. Ltd. | Tone display method |
| CN104469223A (en) * | 2014-12-02 | 2015-03-25 | 苏州佳世达光电有限公司 | Projection device and projection image splicing method |
| CN106154714A (en) * | 2015-04-09 | 2016-11-23 | 深圳市光峰光电技术有限公司 | The method of a kind of spatial light modulator modulation data and optical projection system |
| US20170091910A1 (en) * | 2015-09-25 | 2017-03-30 | Intel Corporation | Facilitating projection pre-shaping of digital images at computing devices |
| CN109388004A (en) * | 2017-08-04 | 2019-02-26 | 深圳光峰科技股份有限公司 | Optical projection system |
-
2019
- 2019-05-24 CN CN201910437733.4A patent/CN110177262B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275271B1 (en) * | 1999-03-04 | 2001-08-14 | Matsushita Electric Industrial Co. Ltd. | Tone display method |
| CN104469223A (en) * | 2014-12-02 | 2015-03-25 | 苏州佳世达光电有限公司 | Projection device and projection image splicing method |
| CN106154714A (en) * | 2015-04-09 | 2016-11-23 | 深圳市光峰光电技术有限公司 | The method of a kind of spatial light modulator modulation data and optical projection system |
| US20170091910A1 (en) * | 2015-09-25 | 2017-03-30 | Intel Corporation | Facilitating projection pre-shaping of digital images at computing devices |
| CN109388004A (en) * | 2017-08-04 | 2019-02-26 | 深圳光峰科技股份有限公司 | Optical projection system |
Non-Patent Citations (2)
| Title |
|---|
| 叶明勤: "DLP数字投影技术的发展", 《现代电视技术》 * |
| 姜兆华等: "DMD数字微镜驱动控制系统分析及其应用", 《应用激光》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117676107A (en) * | 2024-01-31 | 2024-03-08 | 武汉中观自动化科技有限公司 | Image laser projection method and laser projection device |
| CN117676107B (en) * | 2024-01-31 | 2024-05-24 | 武汉中观自动化科技有限公司 | Image laser projection method and laser projection device |
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