CN108377383A - A kind of mostly projection 3D systems light field setting contrast method and its system - Google Patents
A kind of mostly projection 3D systems light field setting contrast method and its system Download PDFInfo
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- CN108377383A CN108377383A CN201610976374.6A CN201610976374A CN108377383A CN 108377383 A CN108377383 A CN 108377383A CN 201610976374 A CN201610976374 A CN 201610976374A CN 108377383 A CN108377383 A CN 108377383A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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Abstract
The more projection 3D systems light field setting contrast methods of one kind and its system of the present invention, by establishing the display model for more projection 3D systems, and obtain the perceptibility of the perceptibility and fusion light field brightness of reference light field brightness, utilize contrast difference measure function, calculate the contrast minimum value of fusion light field and target light field, again according to optimal tone mapping curve, adjustment fusion light field brightness graphic sequence.To improve the light field contrast that 3D display screen is shown, influence of the reflected light to 3D display effect during 3D display is avoided, the display effect of its 3D rendering is improved.
Description
Technical field
The present invention relates to 3D system display technology fields, and 3D system light field contrasts are projected more particularly, to one kind more
Method of adjustment and its system.
Background technology
The 3D display system of more optical projection systems has the characteristics that scalable size, high resolution and dynamic range are high.Currently,
As shown in Figure 1, by projected array, 3D projection screens form typical more projection 3D three-dimensional display systems principles.It is projected according to 3D
The structure of screen is different, which can be divided into the 3D display system based on holographic optical elements (HOE), based on Lenticular screen or
The 3D display system of slit grating, the 3D display system based on the above element Yu other optical element combinations.Based on projected array
With 3D projection screen position relationships, front projection system and back projection system can be divided into.Fig. 1 is that the typical back side is thrown more
Shadow 3D three-dimensional display systems.3D display screen has the function of space light splitting, can be by the light point of incident more projections
Light is to the different position in space.
However, optical 3D display screen has certain reflectivity, incident light usually has part and is reflected, such as Fig. 1
It is shown, therefore the light field of actual acquisition can be defined as Ld=Ld_s+Ld_r+Lamb, Ld_sIt is corresponding viewpoint light field, Ld_rIt is by throwing
The reflected light of the parallax light field of shadow array projection, LambIt is the ambient light of reflection.It is influenced by existing for reflected light, 3D display screen display
The light field contrast shown can reduce, and the quality of 3D rendering can reduce, and the experience effect of 3D can be affected.
Invention content
The present invention provides a kind of mostly projection 3D systems light field setting contrast method and its system, can be according to practical reflected light
Brightness adjusts 3D rendering and shows that the contrast of light field shows quality to provide good 3D rendering in real time, to solve existing 3D display
Shield that image quality is poor, defect of 3D experience sense differences.
According to an aspect of the present invention, one kind is provided and projects 3D system light field setting contrast methods more, feature exists
In comprising following steps:
S1. the light emission luminance based on single projector calculates function, obtains reference light field brightness graphic sequence, and according to comparison
Measurement functions are spent, the perceptive intensity of reference light field brightness graphic sequence is obtained；
S2. the light emission luminance based on multiple projecting apparatus calculates function, obtains fusion light field brightness graphic sequence, is based on contrast
Measurement functions obtain the perceptive intensity of fusion light field brightness graphic sequence；
S3. by the sense of the perceptive intensity of acquired reference light field brightness graphic sequence and acquired fusion light field brightness graphic sequence
Know intensity, by contrast difference measure function, and based on tone mapping curve is optimized, light field luminance graph sequence is merged in adjustment
Row；
S4. it is based on reverse video model, the fusion light field luminance graph after adjustment is Sequence Transformed for fusion parallax sequence output.
On the basis of said program preferably, further include being carried out pair to the reference light field brightness graphic sequence in the step S1
It is handled than degree enhancing.
On the basis of said program preferably, the light emission luminance calculating function formula of the single projector is：
Wherein, LpIndicate that the brightness of display, V are pixel values, interval [0,1], γ is display gamma parameter, EmaxIt is
The maximal illumination value of projector projects, EblackIt is completely black brightness value, EambIt is ambient lighting angle value, N is projecting apparatus number.
On the basis of said program preferably, the light emission luminance calculating function formula of the multiple projecting apparatus is：
And Ld_s(V)=ρdiff·ρs_i·Lp(V), Ld_r(V)=ρs_r·Lp
(V)；
Wherein, D indicates vision area width；P indicates single viewpoint width, D/p=N；VkIt is the pixel value of viewpoint k；Ld-s(Vk)
Indicate the brightness value of projection part at viewpoint k；Ld-r(Vi) indicate the brightness value of reflective portion at viewpoint k, ρdiffIt is Lambertian reflection
The reflectivity of medium, ρs_iIt is the transmissivity of Lenticular screen, ρs_rIt is the reflectivity of Lenticular screen.
On the basis of said program preferably, the contrast difference measure function formula is：
Wherein, dk>=0for k=1...M
Above-mentioned formula is the calculation formula that T () is contrast measurement functions；M indicates that tone reflects the number of fragments of curve,
ρL() indicates Laplacian pyramid；It is the brightness value of the fusion light field after tone mapping,It is to refer to light field
Brightness value.
On the basis of said program preferably, the optimization tone mapping curve definitions are：
Y (x)=(x-xk)·dk+yk,
Wherein, δ is expressed as (xk,yk) and (xk+1,yk+1) between the width that is segmented, x indicates that input brightness, y indicate that output is bright
Degree, dkIndicate slope.
The present invention also provides one kind projecting 3D system light field setting contrast systems more comprising with lower module,
Single projector display module, for obtaining the brightness light field brightness graphic sequence individually projected, and according to contrast
Measurement functions obtain the perceptive intensity of reference light field brightness graphic sequence；
Multiple projecting apparatus display modules for obtaining fusion light field brightness graphic sequence, and are based on contrast measurement functions, obtain
Take the perceptive intensity of fusion light field brightness graphic sequence；
Color range adjusts module, for passing through contrast difference measure function, and based on optimization tone mapping curve, adjustment
Merge light field brightness graphic sequence；
Reverse video module, it is Sequence Transformed for fusion parallax sequence output for the fusion light field luminance graph after adjusting.
On the basis of said program preferably, further include a brightness light field brightness graphic sequence progress for being used to individually to project
The contrast-enhancement module of brightness enhancing processing.
On the basis of said program preferably, the single projector display module further includes that a single projector is shown
Intensity model, the brightness graphic sequence for the parallax sequence of single projector to be converted to single projector, and the model indicate
Formula is：
Wherein, LpIndicate that the brightness value of display, V are pixel values, interval [0,1], γ is display gamma parameter, Emax
It is the maximal illumination value of projector projects, EblackIt is completely black brightness value, EambIt is ambient lighting angle value, N is projecting apparatus number.
On the basis of said program preferably, multiple projecting apparatus display modules further include a multi-projector show it is bright
Model is spent, the brightness graphic sequence for the parallax sequence of multiple projecting apparatus to be converted to fusion light field, and the multi-projector is shown
The light emission luminance of Intensity model calculates function formula：
And Ld_s(V)=ρdiff·ρs_i·Lp(V), Ld_r(V)=ρs_r·Lp(V)；
Wherein, D indicates vision area width；P indicates single viewpoint width, D/p=N；VkIt is the pixel value of viewpoint k；Ld-s(Vk)
Indicate the brightness value of projection part at viewpoint k；Ld-r(Vi) indicate the brightness value of reflective portion at viewpoint k, ρdiffIt is Lambertian reflection
The reflectivity of medium, ρs_iIt is the transmissivity of Lenticular screen, ρs_rIt is the reflectivity of Lenticular screen.
On the basis of said program preferably, the contrast difference measure function formula is：
Wherein, dk>=0for k=1...M
Above-mentioned formula is the calculation formula that T () is contrast measurement functions；M indicates that tone reflects the number of fragments of curve,
ρL() indicates Laplacian pyramid；It is the brightness value of the fusion light field after tone mapping,It is to refer to light field
Brightness value.
One kind of the present invention projecting 3D system light field setting contrast methods, by the perception for obtaining reference light field brightness
The perceptibility of degree and fusion light field brightness calculates pair of fusion light field and target light field using contrast difference measure function
Than degree minimum value, then according to optimal tone mapping curve, adjustment fusion light field brightness graphic sequence.It is shown to improve 3D display screen
Light field contrast, avoid influence of the reflected light to 3D display effect during 3D display, improve the display effect of its 3D rendering.
The present invention's is compared by that will merge light field brightness graphic sequence with reference light field brightness graphic sequence, and utilization is optimal
Tone mapping curve can adjust fusion light field brightness graphic sequence in real time according to practical reflectance lightness, aobvious to change 3D rendering
The contrast for showing light field shows quality to improve 3D rendering, solves existing 3D display screen because of reflected light, caused 3D display screen
Show that image is low, defect of 3D rendering effect difference.
Description of the drawings
Fig. 1 is the rear projection display system schematics of multiple projection 3D display Intensity models of the present invention；
Fig. 2 is the front projection display system schematic diagram of multiple projection 3D display Intensity models of the present invention；
Fig. 3 is the front projection 3D display system construction drawing based on projection grating of the present invention；
Fig. 4 is the light field redistribution schematic diagram of the present invention introduced by cylindrical lens spacious mansion；
Fig. 5 is the schematic diagram for being segmented tone mapping curve；
Fig. 6 is the flow chart of more projection 3D systems light field setting contrast methods of the present invention；
Fig. 7 is the image to be displayed display renderings before adjustment of the present invention；
Fig. 8 is the image to be displayed display renderings after the adjustment of the present invention；
Fig. 9 be the present invention without environment light when tone mapping curve synoptic diagram；
Figure 10 is tone mapping curve synoptic diagram when having ambient light of the present invention.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Refering to Figure 1, one kind of the present invention projecting 3D system light field setting contrast methods comprising following step
Suddenly:
S1. the light emission luminance based on single projector calculates function, obtains reference light field brightness graphic sequence, and according to comparison
Measurement functions are spent, the perceptive intensity of reference light field brightness graphic sequence is obtained；
S2. the light emission luminance based on multiple projecting apparatus calculates function, obtains fusion light field brightness graphic sequence, is based on contrast
Measurement functions obtain the perceptive intensity of fusion light field brightness graphic sequence；
S3. by the sense of the perceptive intensity of acquired reference light field brightness graphic sequence and acquired fusion light field brightness graphic sequence
Know intensity, by contrast difference measure function, and based on tone mapping curve is optimized, light field luminance graph sequence is merged in adjustment
Row；
S4. it is based on reverse video model, the fusion light field luminance graph after adjustment is Sequence Transformed for fusion parallax sequence output.
The reverse video model of the present invention is the inverse process of single projector light emission luminance model.
Concrete operation method is：
By the parallax sequence of image to be displayed, function is calculated by the light emission luminance individually projected and is handled, ginseng is obtained
Examine light field brightness graphic sequence.Then, on the one hand by spending measurement functions, converting reference light field brightness graphic sequence to reference light
The perceptive intensity value of field brightness graphic sequence；On the other hand, by the reference light field brightness graphic sequence got by optimizing tone
Mapping curve is adjusted, and calculates function using the reference light field brightness graphic sequence after adjustment as the light emission luminance of multiple projections
Input value, function is calculated by the light emission luminance of multiple projections and is translated into fusion light field brightness graphic sequence, to avoid more
In projection process, interfering with each other between reflected light.Then, by contrast measurement functions, light field brightness graphic sequence will be merged
It is converted into the perceptive intensity of fusion light field brightness graphic sequence.
Later, by the perceptive intensity value of reference light field brightness graphic sequence and the perceptive intensity that merges light field brightness graphic sequence
Value seeks the contrast difference value between the fusion light field after adjustment and reference light field by contrast difference measure function, with
Minimum value between the two is obtained, realizes that fusion light field and the contrast difference with reference to light field minimize.
Finally, by optimizing tone mapping curve, adjustment fusion light field brightness graphic sequence, and by reverse video model,
Fusion parallax sequence is translated into be exported.
The present invention calculates function, to reduce multiple projecting apparatus in projection process, light by the light emission luminance of multiple projections
The influence that field interferes.Meanwhile the present invention also by be arranged a reference light field brightness perceptive intensity, as reference
Value will merge the perception of the perceptive intensity and reference light field brightness of light field brightness graphic sequence by contrast difference measure function
Intensity is compared, and minimum value between the two is sought, and realizes that fusion light field and the contrast difference with reference to light field minimize, then
Using tone mapping curve is optimized, the brightness graphic sequence of output light field is adjusted, to effectively avoid reflected light to 3D display screen
The influence of display improves the quality of 3D display image and the stereoscopic effect that 3D display is flat.
Further, single projector is influenced in projection process by reflected light and ambient light in order to prevent, leads to it
The reference light field brightness graphic sequence of acquisition has error, further includes being carried out to reference light field brightness graphic sequence in step S1 of the invention
Contrast enhancement processing step can effectively remove ambient light and reflected light to bright with reference to light field that is, by contrast enhancement processing
The influence of degree, it is ensured that its accuracy, the brightness that light field is merged for subsequent processing provide accurately processing basis.
Wherein, the formula of the light emission luminance calculating function individually projected of the invention can be expressed as：
LpIndicate that the brightness of display, V are pixel values, interval [0,1], γ is display gamma parameter, EmaxIt is projecting apparatus
The maximal illumination of projection, EblackIt is completely black illumination, EambIt is ambient light illumination, N is projecting apparatus number.As N=1, indicate single
Projecting apparatus, it is that single projector shows light field to be formed by light field, as N >=2, indicates multi-projector, it is more to be formed by light field
Projecting apparatus shows that light field is as Figure 1-Figure 4, is that the multi-projector of different directions shows light field.
In calculating process, according to the number of the pixel value of display screen and projecting apparatus, the maximal illumination of projector projects, show
Completely black illumination, the ambient light illumination of display screen, and suitably choose and show that gamma parameter value, the reference light field for obtaining single projector are bright
Spend graphic sequence value.As the preferred technical solution of the present invention, γ of the invention is 2.2 in RGB standard dynamic space.
The optical projection system of the present invention, illuminance is easier to measure than brightness, for the bright of the 2 π solid angle angles of divergence
Primary body, the relationship between brightness L and illumination E can be expressed as E=π L.Therefore the brightness for obtaining projection part is as follows：Ld_s(V)=
ρdiff·ρs_i·Lp(V)；
The brightness of reflective portion is such as：Ld_r(V)=ρs_r·Lp(V)；
Wherein, the ρ in above-mentioned formuladiffIt is the reflectivity of Lambertian reflection medium, ρs_iIt is the transmissivity of Lenticular screen,
ρs_rIt is the reflectivity of Lenticular screen, LP(V)Indicate the brightness of display, EambIt is ambient light illumination.
And the brightness and the brightness of ambient light and the brightness of reflected light that the brightness that human eye finally captures is viewpoint light field
The sum of, i.e. Ld=Ld_s+Ld_r+Lamb。
Since the 3D models that in real process, human eye is watched are produced by the light field that multiple projecting apparatus are cast out
Image, in order to avoid the mutual interference of light field produced by projecting apparatus, invention also defines the luminances of multiple projections
Degree calculates function to exclude the interference between adjacent light field, and the light emission luminance of multiple projecting apparatus calculates function formula and can indicate
For：
Wherein, D indicates vision area width；P indicates single viewpoint width, D/p=N；VkIt is the pixel value of viewpoint k；Ld-s(Vk)
Indicate the brightness value of projection part at viewpoint k；Ld-r(Vi) indicate the brightness value of reflective portion at viewpoint k.
Further, the present invention in order to seek with reference to light field with merge difference between contrast difference between light field most
Smallization also defines contrast difference measure function, which can be expressed as following formula, such as：
Wherein, dk>=0for k=1...M
And r=log10(Lp(1)/Lp(0))
Above-mentioned formula is the calculation formula that T () is contrast measurement functions；M indicates that tone reflects the number of fragments of curve,
ρL() indicates Laplacian pyramid；It is the brightness value of the fusion light field after tone mapping,It is to refer to light field
Brightness value.
I.e. by respectively to after tone mapping fusion light field brightness value and reference light field brightness value carry out seeking logarithm, so
Afterwards to seeking La Pusi pyramid decompositions respectively, the value after decomposition is calculated by contrast measurement functions respectively, is obtained
The two, is then compared by the induction for merging the induction and reference light field brightness of light field brightness, and it is poor to obtain the two
Different minimum value, and when both seeking difference value minimum value, the fusion light field brightness graphic sequence after tone mapping.
Wherein, the brightness value calculation formula of the fusion light field after tone mapping of the invention can be expressed as：
And s1=N ρdiff·ρs_i
s2=N ρs_r
N is the number of projecting apparatus, LpIt is the brightness of current view point, LpiIt is the projection brightness for projecting i.The dynamic of display system
Ranging from r,
Further, optimization tone mapping curve definitions of the invention are：
Y (x)=(x-xk)·dk+yk,
Wherein, δ is expressed as (xk,yk) and (xk+1,yk+1) between the width that is segmented, x indicates that input brightness, y indicate that output is bright
Degree, and the present invention operated by tone mapping after brightness valueIt can be expressed asWherein, Fig. 5 is the schematic diagram for being segmented tone mapping curve.
Technical solution in order to further illustrate the present invention, below with reference to concrete numerical value, the tune that the present invention will be described in detail
Adjusting method, experiment is that the experiment parameter based on table 1 is handled below, wherein if Fig. 7 is display effect before adjusting, Fig. 8 is logical
Cross the present invention method of adjustment Fig. 7 is adjusted after display effect, and Fig. 9 be no environment light when tone mapping curve signal
Figure, Figure 10 are tone mapping curve synoptic diagram when having ambient light.
Table 1 is experiment parameter:
The present invention also provides one kind projecting 3D system light field setting contrast systems more comprising with lower module,
Single Projection Display model, for obtaining the brightness light field brightness graphic sequence individually projected, and is surveyed according to contrast
Flow function obtains the perceptive intensity of reference light field brightness graphic sequence；
Multiple Projection Display models for obtaining fusion light field brightness graphic sequence, and are based on contrast measurement functions, obtain
Merge the perceptive intensity of light field brightness graphic sequence；
Color range adjusts module, for passing through contrast difference measure function, and based on optimization tone mapping curve, adjustment
Merge light field brightness graphic sequence；
Reverse video module, it is Sequence Transformed for fusion parallax sequence output for the fusion light field luminance graph after adjusting.
Preferably, the more projection 3D system light field setting contrast systems of one kind of the invention further include one for will individually throw
The brightness light field brightness graphic sequence of shadow instrument carries out the contrast-enhancement module of brightness enhancing processing.
Preferably, single projector display module of the invention further includes a single projector display brightness model, is used
In the brightness graphic sequence that the parallax sequence of single projector is converted to single projector, and the single projector display brightness mould
The luminance function of type can be
Wherein, LpIndicate that the brightness of display, V are pixel values, interval [0,1], γ is display gamma parameter, EmaxIt is
The maximal illumination of projector projects, EblackIt is completely black illumination, EambIt is ambient light illumination, N is projecting apparatus number.
On the basis of said program preferably, multiple projecting apparatus display modules further include a multi-projector show it is bright
Model is spent, the brightness graphic sequence for the parallax sequence of multiple projecting apparatus to be converted to fusion light field, and the multi-projector is shown
The light emission luminance of Intensity model calculates function formula：
Wherein, D indicates vision area width；P indicates single viewpoint width, D/p=N；VkIt is the pixel value of viewpoint k；Ld-s(Vk)
Indicate the brightness value of projection part at viewpoint k；Ld-r(Vi) indicate the brightness value of reflective portion at viewpoint k.
On the basis of said program preferably, the contrast difference measure function formula is：
Wherein, dk>=0for k=1...M
Above-mentioned formula is the calculation formula that T () is contrast measurement functions；M indicates that tone reflects the number of fragments of curve,
ρL() indicates Laplacian pyramid；It is the fusion light field after tone mapping,It is to refer to light field.
Single projector is influenced in projection process by reflected light and ambient light in order to prevent, the ginseng for causing it to obtain
Examine the wrong difference of light field brightness graphic sequence.One kind of the present invention projecting 3D system light field setting contrast systems, further includes a use
In the contrast-enhancement module that the brightness light field brightness graphic sequence of single projector is carried out to brightness enhancing processing.
It is preferred that single projector display module of the invention further includes a single projector display brightness model, it is used for
The parallax sequence individually projected is converted to the brightness graphic sequence of single projector, and the model representation formula is
Wherein, LpIndicate that the brightness of display, V are pixel values, interval [0,1], γ is display gamma parameter, EmaxIt is
The maximal illumination of projector projects, EblackIt is completely black illumination, EambIt is ambient light illumination, N is projecting apparatus number.
Further, multiple projecting apparatus display modules of the invention further include a multi-projector display brightness model, are used
In the brightness graphic sequence that the parallax sequence of multiple projecting apparatus is converted to fusion light field, and the multi-projector display brightness model
Light emission luminance calculates function formula：
Wherein, D indicates vision area width；P indicates single viewpoint width；VkIt is the pixel value of viewpoint k；Ld-s(Vk) indicate viewpoint
The brightness value of part is projected at k；Ld-r(Vi) indicate the brightness value of reflective portion at viewpoint k.
Further, contrast difference measure function formula of the invention is：
Wherein, dk>=0for k=1...M
Above-mentioned formula is the calculation formula that T () is contrast measurement functions；M indicates that tone reflects the number of fragments of curve,
ρL() indicates Laplacian pyramid；It is the fusion light field after tone mapping,It is to refer to light field.
One kind of the present invention projecting 3D system light field setting contrast methods, by the perception for obtaining reference light field brightness
The perceptibility of degree and fusion light field brightness calculates pair of fusion light field and target light field using contrast difference measure function
Than degree minimum value, then according to optimal tone mapping curve, adjustment fusion light field brightness graphic sequence.It is shown to improve 3D display screen
Light field contrast, avoid influence of the reflected light to 3D display effect during 3D display, improve the display effect of its 3D rendering.
The present invention's is compared by that will merge light field brightness graphic sequence with reference light field brightness graphic sequence, and utilization is optimal
Tone mapping curve can adjust fusion light field brightness graphic sequence in real time according to practical reflectance lightness, aobvious to change 3D rendering
The contrast for showing light field shows quality to improve 3D rendering, solves existing 3D display screen because of reflected light, caused 3D display screen
Show that image is low, defect of 3D rendering effect difference.
Technical term of the present invention is as follows：
Dynamic range：The ratio between maximum brightness and minimum brightness that display equipment can be shown.
Display brightness model：Indicate the mathematical model of mapping relations between display display brightness and input pixel value.
Tone mapping：An approximate computer graphics for showing high dynamic range images on limited dynamic range medium
Technology, the range that significantly setting contrast to scene brightness can be shown, while keeping the weight such as brightness of image and color
Want information.
Lambertian reflection：The radiance of radiation source all directions is constant, radiation intensity with direction of observation and face source normal it
Between the transformation of angle follow cosine rule.
Finally, the present processes are only preferable embodiment, are not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of more projection 3D system light field setting contrast methods, which is characterized in that it includes the following steps:
S1. the light emission luminance based on single projector calculates function, obtains reference light field brightness graphic sequence, and survey according to contrast
Flow function obtains the perceptive intensity of reference light field brightness graphic sequence；
S2. the light emission luminance based on multiple projecting apparatus calculates function, obtains fusion light field brightness graphic sequence, is measured based on contrast
Function obtains the perceptive intensity of fusion light field brightness graphic sequence；
S3. the perception of the perceptive intensity of acquired reference light field brightness graphic sequence and acquired fusion light field brightness graphic sequence is strong
Degree, by contrast difference measure function, and based on tone mapping curve is optimized, light field brightness graphic sequence is merged in adjustment；
S4. it is based on reverse video model, the fusion light field luminance graph after adjustment is Sequence Transformed for fusion parallax sequence output.
2. a kind of more projection 3D system light field setting contrast methods as described in claim 1, it is characterised in that：The step
Further include that contrast enhancement processing is carried out to the reference light field brightness graphic sequence in S1.
3. a kind of more projection 3D system light field setting contrast methods as claimed in claim 2, it is characterised in that：It is described single
The light emission luminance of projecting apparatus calculates function formula：
Wherein, LpIndicate that the brightness of display, V are pixel values, interval [0,1], γ is display gamma parameter, EmaxIt is projecting apparatus
The maximal illumination value of projection, EblackIt is completely black brightness value, EambIt is ambient lighting angle value, N is projecting apparatus number.
4. a kind of more projection 3D system light field setting contrast methods as claimed in claim 2, it is characterised in that：It is the multiple
The light emission luminance of projecting apparatus calculates function formula：
And Ld_s(V)=ρdiff·ρs_i·Lp(V), Ld_r(V)=ρs_r·Lp(V)；
Wherein, D indicates vision area width；P indicates single viewpoint width, D/p=N；VkIt is the pixel value of viewpoint k；Ld-s(Vk) indicate
The brightness value of part is projected at viewpoint k；Ld-r(Vi) indicate the brightness value of reflective portion at viewpoint k, ρdiffIt is Lambertian reflection medium
Reflectivity, ρs_iIt is the transmissivity of Lenticular screen, ρs_rIt is the reflectivity of Lenticular screen.
5. a kind of more projection 3D system light field setting contrast methods as described in claim 1, which is characterized in that pair
It is than degree difference measure function formula：
Wherein, dk>=0, and k=1...M；
Above-mentioned formula is the calculation formula that T () is contrast measurement functions；M indicates that tone reflects the number of fragments of curve, ρL(·)
Indicate Laplacian pyramid；It is the brightness value of the fusion light field after tone mapping,It is the brightness with reference to light field
Value.
6. much as claimed in claim 5 a kind of projecting 3D system light field setting contrast methods, which is characterized in that it is described most
Optimizing tone mapping curve definitions is：
Y (x)=(x-xk)·dk+yk
Wherein, δ is expressed as (xk,yk) and (xk+1,yk+1) between the width that is segmented, x indicates that input brightness, y indicate output brightness,
dkIndicate slope.
7. a kind of more projection 3D system light field setting contrast systems, it is characterised in that：It is comprised the following modules,
Single projector display module for obtaining the brightness light field brightness graphic sequence individually projected, and is measured according to contrast
Function obtains the perceptive intensity of reference light field brightness graphic sequence；
Multiple projecting apparatus display modules for obtaining fusion light field brightness graphic sequence, and are based on contrast measurement functions, and acquisition is melted
The perceptive intensity of closing light field brightness graphic sequence；
Color range adjusts module, for passing through contrast difference measure function, and based on optimization tone mapping curve, adjustment fusion
Light field brightness graphic sequence；
Reverse video module, it is Sequence Transformed for fusion parallax sequence output for the fusion light field luminance graph after adjusting.
8. a kind of more projection 3D system light field setting contrast systems as claimed in claim 7, it is characterised in that：It further includes
One contrast-enhancement module for the brightness light field brightness graphic sequence individually projected to be carried out to brightness enhancing processing.
9. a kind of more projection 3D system light field setting contrast systems as claimed in claim 7, it is characterised in that：The list
A projecting apparatus display module further includes a single projector display brightness model, for turning the parallax sequence of single projector
It is changed to the brightness graphic sequence of single projector, and the model representation formula is：
Wherein, LpIndicate that the brightness value of display, V are pixel values, interval [0,1], γ is display gamma parameter, EmaxIt is projection
The maximal illumination value of instrument projection, EblackIt is completely black brightness value, EambIt is ambient lighting angle value, N is projecting apparatus number.
10. a kind of more projection 3D system light field setting contrast systems as claimed in claim 7, it is characterised in that：Described
Multiple projecting apparatus display modules further include a multi-projector display brightness model, for turning the parallax sequence of multiple projecting apparatus
It is changed to the brightness graphic sequence of fusion light field, and the light emission luminance calculating function formula of the multi-projector display brightness model is：
And Ld_s(V)=ρdiff·ρs_i·Lp(V), Ld_r(V)=ρs_r·Lp(V)；
Wherein, D indicates vision area width；P indicates single viewpoint width, D/p=N；VkIt is the pixel value of viewpoint k；Ld-s(Vk) indicate
The brightness value of part is projected at viewpoint k；Ld-r(Vi) indicate the brightness value of reflective portion at viewpoint k, ρdiffIt is Lambertian reflection medium
Reflectivity, ρs_iIt is the transmissivity of Lenticular screen, ρs_rIt is the reflectivity of Lenticular screen.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866997A (en) * | 2021-09-17 | 2021-12-31 | 深圳技术大学 | Display system |
| CN117499604A (en) * | 2023-10-31 | 2024-02-02 | 深圳欣盛商科技有限公司 | Color regulating method and device for single-chip LCD projector and single-chip LCD projector |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430085A (en) * | 2001-12-28 | 2003-07-16 | 索尼公司 | Projection display device |
| US20090027558A1 (en) * | 2007-07-27 | 2009-01-29 | Rafal Mantiuk | Apparatus and Method for Rendering High Dynamic Range Images for Standard Dynamic Range Display |
| CN101377612A (en) * | 2007-08-31 | 2009-03-04 | 鸿富锦精密工业（深圳）有限公司 | Projector and contrast regulating device thereof |
| CN101411207A (en) * | 2006-04-04 | 2009-04-15 | 三菱电机株式会社 | Method and system for acquiring and displaying 3d light fields |
| US20110051100A1 (en) * | 2009-08-25 | 2011-03-03 | Acer Incorporated | Method for compensating light reflection of projection frame and projection apparatus |
| CN102341740A (en) * | 2009-06-22 | 2012-02-01 | 财团法人工业技术研究院 | Light-emitting unit array, method for fabricating the same and projection apparatus |
| CN102726050A (en) * | 2009-07-31 | 2012-10-10 | 和乐格拉飞卡公司 | Method and apparatus for displaying 3D images |
| CN104111579A (en) * | 2014-07-04 | 2014-10-22 | 深圳雅图数字视频技术有限公司 | Method for adjusting contrast of projector in real time and projector |
| CN104634276A (en) * | 2015-02-12 | 2015-05-20 | 北京唯创视界科技有限公司 | Three-dimensional measuring system, photographing device, photographing method, depth calculation method and depth calculation device |
| CN105892061A (en) * | 2016-06-24 | 2016-08-24 | 北京国承万通信息科技有限公司 | Display device and display method |
-
2016
- 2016-11-07 CN CN201610976374.6A patent/CN108377383B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430085A (en) * | 2001-12-28 | 2003-07-16 | 索尼公司 | Projection display device |
| CN101411207A (en) * | 2006-04-04 | 2009-04-15 | 三菱电机株式会社 | Method and system for acquiring and displaying 3d light fields |
| US20090027558A1 (en) * | 2007-07-27 | 2009-01-29 | Rafal Mantiuk | Apparatus and Method for Rendering High Dynamic Range Images for Standard Dynamic Range Display |
| CN101377612A (en) * | 2007-08-31 | 2009-03-04 | 鸿富锦精密工业（深圳）有限公司 | Projector and contrast regulating device thereof |
| CN102341740A (en) * | 2009-06-22 | 2012-02-01 | 财团法人工业技术研究院 | Light-emitting unit array, method for fabricating the same and projection apparatus |
| CN102726050A (en) * | 2009-07-31 | 2012-10-10 | 和乐格拉飞卡公司 | Method and apparatus for displaying 3D images |
| US20110051100A1 (en) * | 2009-08-25 | 2011-03-03 | Acer Incorporated | Method for compensating light reflection of projection frame and projection apparatus |
| CN104111579A (en) * | 2014-07-04 | 2014-10-22 | 深圳雅图数字视频技术有限公司 | Method for adjusting contrast of projector in real time and projector |
| CN104634276A (en) * | 2015-02-12 | 2015-05-20 | 北京唯创视界科技有限公司 | Three-dimensional measuring system, photographing device, photographing method, depth calculation method and depth calculation device |
| CN105892061A (en) * | 2016-06-24 | 2016-08-24 | 北京国承万通信息科技有限公司 | Display device and display method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866997A (en) * | 2021-09-17 | 2021-12-31 | 深圳技术大学 | Display system |
| CN113866997B (en) * | 2021-09-17 | 2023-10-24 | 深圳技术大学 | Display system |
| CN117499604A (en) * | 2023-10-31 | 2024-02-02 | 深圳欣盛商科技有限公司 | Color regulating method and device for single-chip LCD projector and single-chip LCD projector |
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|---|---|
| CN108377383B (en) | 2020-01-10 |
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