CN104065901B - Optical projection system, projector and its bearing calibration - Google Patents
Optical projection system, projector and its bearing calibration Download PDFInfo
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- CN104065901B CN104065901B CN201310096489.2A CN201310096489A CN104065901B CN 104065901 B CN104065901 B CN 104065901B CN 201310096489 A CN201310096489 A CN 201310096489A CN 104065901 B CN104065901 B CN 104065901B
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Abstract
The invention discloses a kind of optical projection system, projector and its bearing calibration, in the system：Not correcting digital driving levels output unit can be such that projector is not corrected under digital driving levels in different, difference projection image at least part region of projectual.Brightness sensing device can work as projector respectively different when not correcting under digital driving levels, sense the luminance parameter of above-mentioned zone.Characteristic curve computing unit according to digital driving levels and luminance parameter are not corrected, can obtain the characteristic curve of projector.Correction unit can be corrected program according to characteristic curve and GTG standard display function, with obtain it is each do not correct corresponding to digital driving levels one corrected digital driving levels.Projector can be made in the case where having corrected digital driving levels by having corrected digital driving levels output unit, project another picture at least part region of projectual.
Description
Technical field
The present invention is on a kind of projector, and especially in regard to a kind of optical projection system, projector and its bearing calibration.
Background technology
Because medical display device is used for the diagnosis of disease, concern life security, therefore medical display device is necessary
All details of medical image are accurately shown, in order to avoid cause the erroneous judgement of healthcare givers.
In order to help all medical display devices accurately to show all details of image, association area
Manufacturer and scholar work up medical digitized video and communication (Digital Imaging and Communications jointly
In Medicine, DICOM) agreement, and worked out in this agreement GTG standard display function (Grayscale Standard
Display Function, GSDF), the condition that should be met with the medical image of specification, such as image brilliance etc..
As long as showing medical image, any display device, such as：Liquid crystal display, crt display etc.
Deng being both needed to meet the specification of GTG standard display function.However, to go out to meet GTG standard display function using projector
Image be not easy to.
The content of the invention
In view of this, a purpose of the invention is in order that projector meets GTG standard display function (GSDF)
Image.
In order to achieve the above object, according to one embodiment of the present invention, a kind of optical projection system includes a projector, one not
Correct digital driving levels output unit, a brightness sensing device, a characteristic curve computing unit, a correction unit and one
Correct digital driving levels output unit.It is available so that projector is in different non-schools that digital driving levels output unit is not corrected
Under positive digital drive level (digital driving level, DDL), a picture a to projectual is projected respectively at least
Subregion.Brightness sensing device can be used to when projector is not respectively different when correcting under digital driving levels, on sensing
State a luminance parameter at least part region.Characteristic curve computing unit can be used to basis and not correct digital driving levels and brightness
Parameter, obtains a characteristic curve of projector.Correction unit can be used to according to characteristic curve and the progress of GTG standard display function
One correction program, with obtain it is each do not correct corresponding to digital driving levels one corrected digital driving levels.Correction number
Word drive level output unit is available so that projector is in the case where having corrected digital driving levels, projects another picture to projectual
At least part region.
According to another embodiment of the present invention, a kind of projector does not correct digital drive comprising an image projection module, one
Dynamic level output unit, a characteristic curve computing unit, a correction unit and one have corrected digital driving levels output unit.
Do not correct that digital driving levels output unit is available so that image projection module is not corrected under digital driving levels in different, point
At least part region of a picture a to projectual is not projected.Characteristic curve computing unit can be used to basis and not correct digital drive
The luminance parameter that dynamic level and a brightness sensing device are sensed, obtains a characteristic curve of projector.Correcting unit can
To carry out a correction program according to characteristic curve and a GTG standard display function, to obtain each not correcting digital drive electricity
One corresponding to flat has corrected digital driving levels.Digital driving levels output unit is corrected available so that image projection module
In the case where having corrected digital driving levels, another picture is projected at least part region of projectual.
The step of foundation another embodiment of the invention, a kind of bearing calibration of projector, includes：Existed by a projector
It is different when not correcting under digital driving levels, at least part region of a picture a to projectual is projected respectively；Work as projection
Machine senses above-mentioned at least part region respectively different when not correcting under digital driving levels using a brightness sensing device
One luminance parameter, to obtain a characteristic curve of projector；One is carried out according to characteristic curve and GTG standard display function to correct
Program, with obtain it is each do not correct corresponding to digital driving levels one corrected digital driving levels.Make projector in school
Under positive digital drive level, another picture is projected at least part region of projectual.
In above-mentioned embodiment, the projection that the luminance parameter that brightness sensing device is sensed not only is projected with projector
Picture is related, also related to ambient brightness.In this way, projector can just carry out digital driving levels in the case where considering ambient brightness
Correction so that projector projects the picture or image for meeting GTG standard display function in the case where having corrected digital driving levels.
It is described above only to illustrate the present invention it is to be solved the problem of, solve problem technological means and its generation
Effect etc., detail of the invention will be discussed in detail in embodiment below and correlative type.
Brief description of the drawings
For above and other purpose, feature, advantage and the embodiment of the present invention can be become apparent, institute's accompanying drawings
It is described as follows：
Fig. 1 illustrates the schematic diagram of the optical projection system according to an embodiment of the present invention；
Fig. 2 illustrates the functional block diagram of the optical projection system according to an embodiment of the present invention；
Fig. 3 illustrates the curve map of the GTG standard display function according to an embodiment of the present invention；
Fig. 4 illustrates the song according to the characteristic curve C2 of an embodiment of the present invention and the curve C1 of GTG standard display function
Line chart；
Fig. 5 illustrates a hardware architecture diagram of the optical projection system according to an embodiment of the present invention；
Fig. 6 illustrates the schematic diagram of the optical projection system according to another embodiment of the invention；
Fig. 7 illustrates the functional block diagram of the optical projection system according to another embodiment of the invention；
Fig. 8 illustrates the flow chart of the bearing calibration of the projector according to an embodiment of the present invention；
Fig. 9 illustrates the flow chart of the previous operations of the bearing calibration of the projector according to an embodiment of the present invention；
Figure 10 illustrates the flow chart of the rearmounted operation of the bearing calibration of the projector according to an embodiment of the present invention.
Wherein, description of reference numerals is as follows：
100：Projector
110：Controller
111、510：Digital driving levels output unit is not corrected
112、520：Characteristic curve output unit
113、530：Correct unit
114、540：GTG standard display function storage element
115、550：Picture fixed cell
116、560：Luminance calculation unit
117、570：Digital driving levels output unit is corrected
120：Vision signal front-end circuit
130：Video frequency signal processing chip
140：Image projection module
142：Display panel
144：Rear lens group
146：Preceding lens group
148：Projection light source
150：Image transmission interface
160：Apparatus for lighting up circuit
170：Memory
190：Bus
200：Brightness sensing device
300：Projectual
310：Region
400：Connecting line
410：First sub- connecting line
420：Second sub- connecting line
500：Computer
610~640,701~708,711~717：Step
700：Previous operations
710：Rearmounted operation
C1：The curve of GTG standard display function
C2：Characteristic curve
Lmin：Minimum brightness value
Lmax：Highest brightness value
i,j,k,l：Point
P1：Sensing data
P2：Calculate data
Embodiment
The plural embodiment of the present invention, as clearly stated, the details in many practices will be disclosed with schema below
It will be explained in the following description.However, those skilled in the art are it should be appreciated that in part embodiment party of the present invention
In formula, details in these practices not necessarily, therefore is not applied to limit the present invention.In addition, for the sake of simplifying schema, one
A little existing usual structures will be illustrated in the way of simply illustrating in the drawings with element.
Fig. 1 illustrates the schematic diagram of the optical projection system according to an embodiment of the present invention.As shown in figure 1, present embodiment
Optical projection system can include a projector 100.Projector 100 can project picture towards at least part region 310 of a projectual 300
Face.However, the picture brightness that projector 100 is incident upon on projectual 300 is easily influenceed by ambient brightness, citing comes
Say, when projectual 300 is under sunshine, picture brightness is higher, relatively, when projectual 300 is in interior, draw
Face brightness is relatively low.Therefore, as long as ambient brightness changes, projector 100 is just difficult to meet medical digitized video and communication
(DICOM) in agreement on characteristic curve (Characteristic Curve), explicit function (Display Function) with
The specification of GTG standard display function (GSDF).In view of this, the optical projection system of present embodiment employs brightness sensing dress
200 are put, it can wirelessly or by hard wire be electrically connected with projector 100 (such as by connecting line 400), examined with sharp projector 100
Measure under ambient brightness, and project the picture or image for meeting GTG standard display function.
Furthermore, it is understood that see Fig. 2, this figure illustrates the function block of the optical projection system according to an embodiment of the present invention
Figure.As shown in Fig. 2 projector 100 can include the one of an image projection module 140 and electric connection image projection module 140
Controller 110.Controller 110 can not correct digital driving levels output unit 111, a characteristic curve computing unit comprising one
112nd, a correction unit 113, a GTG standard display function storage element 114 and one have corrected digital driving levels output list
Member 117.The image projection module for not correcting the electric connection of digital driving levels output unit 111 projector 100 of controller 110
140, and it is available so that image projection module 140 is not corrected under digital driving levels (DDL) in different, a picture is projected respectively
To at least part region 310 (see Fig. 1) of projectual 300.Brightness sensing device 200 can be used to work as 100 points of projector
Not different when not correcting under digital driving levels, a luminance parameter in above-mentioned at least part region 310 is sensed.Characteristic curve
Computing unit 112 is electrically connected with brightness sensing device 200, and can be used to according to not correcting digital driving levels and corresponding brightness
Parameter, obtains the characteristic curve (Characteristic Curve) of projector 100.GTG standard display function storage element
114 store GTG standard display function.Correct the electric connection characteristic curve of unit 113 computing unit 112 and GTG standard is aobvious
Show function storage element 114, and can be respectively from characteristic curve computing unit 112 and GTG standard display function storage element 114
In obtain characteristic curve and GTG standard display function, and a correction program is carried out accordingly, to obtain each not correcting digital drive
Correction digital driving levels corresponding to dynamic level.Correct digital driving levels output unit 117 and be electrically connected with correction list
Member 113 and image projection module 140, so just can have been corrected digital driving levels from correction unit 113, and make image
Projection module 140 projects the picture after correction to the region 310 of projectual 300 in the case where having corrected digital driving levels.So
One, projector 100 just can project the picture for meeting GTG standard display function (GSDF) in the case where considering ambient brightness
Or image.
It will be understood that " not correcting " digital driving levels and " correction " digital driving levels described in this specification
Only to help reader area every two digital driving levels before correction and after correction.Digital driving levels are a data signal
Value, the data signal of such as 8 forms, that is, 0≤DDL≤255, and DDL is integer.
Fig. 3 illustrates the curve map of the GTG standard display function according to an embodiment of the present invention.The transverse axis of this figure is can
The index (Just-Noticeable Difference index, JNDindex) of the minimum difference noted, the longitudinal axis is to number form
The luminance parameter of formula, this luminance parameter is brightness value in this figure (Luminance, unit is cd/m2).This specification institute
The JND stated is the luminance difference that human eye can be experienced just, and JND index are the input value of GTG standard display function, therefore
JND index can be substituted into GTG standard display function, to calculate luminance parameter, any JND index and previous JND
Index substitutes into luminance difference resulting after GTG standard display function, the minimum difference that exactly human eye can pay attention to.Wherein,
GTG standard display function is as follows：
Wherein L (j) is brightness value, and j is that JND index, 1≤j≤1023, and j are integer；
Ln is natural logrithm；
a=-1.3011877,b=-2.5840191E-2,c=8.0242636E-2,d=-1.0320229E-1,e=
1.3646699E-1,f=2.8745620E-2,g=-2.5468404E-2,h=-3.1978977E-3,k=1.2992634E-4,m=
1.3635334E-4。
Fig. 4 illustrates the song according to the characteristic curve C2 of an embodiment of the present invention and the curve C1 of GTG standard display function
Line chart.The transverse axis of this figure is digital driving levels (DDL), and it is brightness value in luminance parameter, Yu Bentu that the longitudinal axis, which is,.Different numerals
Drive level can drive projector 100 to project the picture with different luminance parameters.For example, when digital driving levels are
When 70, the brightness value obtained by brightness sensing device 200 (see Fig. 2) is about 2.15cd/m2, and works as digital driving levels
For 135 when, the brightness value obtained by brightness sensing device 200 is about 15.9cd/m2.Above-mentioned numerical value is only example, is not used
To limit the present invention.
According to the luminance parameter sensed in digital driving levels and brightness sensing device 200, characteristic curve calculates single
Member 112 can produce characteristic curve C2.For example, Fig. 2 and Fig. 4 is see, brightness sensing device 200 can be sensed and obtained
Multiple sensing data P1, and characteristic curve computing unit 112 can according to these sensing datas P1, using the mode of interpolation method come
To data P2 is calculated, characteristic curve computing unit 112 can integrate sensing data P1 and calculate data P2, and produce characteristic curve
C2。
Refer to Fig. 2,3 and 4, the brightness value that brightness sensing device 200 is obtained under different digital driving levels between
Between minimum brightness value Lmin and highest brightness value Lmax.Correction unit 113 can be obtained in Fig. 3 accordingly, between minimum brightness value
The curve C1 of GTG standard display function between Lmin and highest brightness value Lmax.
According to the curve C1 and characteristic curve C2 of GTG standard display function, correction unit 113 recoverable digital drive electricity
It is flat.Specifically, as shown in Figures 2 and 4, it to be point i that drive level is not corrected, and correcting unit 113 can show in GTG standard
Show and corresponding first luminance parameter is obtained on the curve C1 of function, that is, point j.Correction unit 113 can be obtained on characteristic curve C2
To second luminance parameter equal with the first luminance parameter, that is, the point k contour with point j.Correcting unit 113 can be bent by characteristic
The correction digital driving levels corresponding to point k can be obtained on line C2, that is, point l.
Because correction unit 113 can obtain each non-school according to the curve C1 and characteristic curve C2 of GTG standard display function
Correction digital driving levels corresponding to positive digital drive level, therefore these can not corrected to digital driving levels (such as point
I) and digital driving levels have been corrected (such as point l) makes look-up table (Look-up Table, LUT).Consequently, it is possible to work as image
When projection module 140 (see Fig. 2) receives one and does not correct digital driving levels DDL_i, it is only necessary to from correction unit 113
Look-up table finds this and does not correct the digital driving levels DDL_l of correction corresponding to digital driving levels DDL_i, then passes through school
Positive digital drive level output unit 117, which is provided, has corrected digital driving levels DDL_l to image projection module 140, you can make
Image projection module 140 projects the picture or image for meeting GTG standard display function.Further, since existing image projecting
The LUT of video signal digital drive level is equipped with module 140, it is above-described to have corrected digital driving levels output list
Member 117, also can store and be embodied in image projecting module 140 in practice.
In addition to ambient brightness, when the size of picture changes, the brightness of picture be able to may also change therewith.Citing comes
Say, when picture reduces, its brightness may increase, on the contrary, when picture expands, its brightness may be reduced.Therefore, in
In some embodiments, as shown in Fig. 2 optical projection system can also include a picture fixed cell 115, it can be used to control image and throws
The size of the fixed image of module 140 is penetrated, the luminance parameter for influenceing brightness sensing device 200 to be sensed can be so avoided.
In some embodiments, when picture dimension changes, then it can fix single by picture after the completion of size change
Member 115 controls the picture dimension that image projection module 140 is fixed after changing.After picture dimension is fixed, it can be filled by brightness sensing
200 sensing brightness parameters, and characteristic curve C2 (see Fig. 4) is re-fetched by characteristic curve computing unit 112 again are put, and
Re-calibrated by correction unit 113.Consequently, it is possible to which even if picture dimension changes, projector 100, which can still project, meets GTG mark
The picture or image of quasi- explicit function.
In addition to ambient brightness and picture dimension, the yield value of projectual 300 (see Fig. 1) may also can influence bright
The luminance parameter that degree sensing device further 200 is sensed.Therefore, in some embodiments, as shown in Fig. 2 optical projection system may be used also
Including a luminance calculation unit 116.The luminance parameter that brightness sensing device 200 is sensed can for brightness value (Illuminance,
Unit is lux), luminance calculation unit 116 can receive the data of this brightness value, and according to the area of brightness value and projectual 300
The yield value (Gain) in domain 310, obtains the brightness value of picture (Luminance, unit is cd/m2).Specifically, brightness impression is worked as
When survey device 200 senses brightness value I, luminance calculation unit 116 can perform following formula to obtain brightness value L：
I×r/π=L
Wherein π is pi, that is, π=3.1415926 ...；
R is the reflectivity of projectual 300.
In general, the reflectivity r of projectual 300 is approximately equal to its yield value, or is proportionate with yield value.Cause
This, by above formula, can obtain brightness value L according to yield value (reflectivity) and brightness value I.Therefore, projector 100 can be by bright
Spend computing unit 116 calculating, and projected in the case where considering yield value the picture for meeting GTG standard display function or
Image.For preferably, the yield value of projectual 300 is 1, and its reflectivity r is also 1.
Fig. 5 illustrates a hardware architecture diagram of the optical projection system according to an embodiment of the present invention.As shown in figure 5, projector
100 can include a controller 110, a vision signal front-end circuit 120, a video frequency signal processing chip 130, an image projective module
Block 140, an image transmission interface 150, an apparatus for lighting up circuit 160, a memory 170 and a bus 190.Controller 110, regard
Frequency signal front-end circuit 120 and video frequency signal processing chip 130 are electrically connected with bus 190, and image projection module 140 is electrical
Connect video frequency signal processing chip 130.Consequently, it is possible to which controller 110 just can be believed by vision signal front-end circuit 120 and video
The projection image of number process chip 130 control image projection module 140.
Referring to Fig. 5, in some embodiments, controller 110 can by an external device (ED) by remote control sensor 102 come
Control, or controlled by connecting interface 104.Remote control sensor 102 can be infrared sensor, but the present invention is not with this
It is limited.Connecting interface 104 can be RS232 interfaces, but the present invention is not limited thereto.Referring to Fig. 2, digital drive is not corrected
Level output unit 111, characteristic curve computing unit 112, correction unit 113, GTG standard display function storage element 114,
Picture fixed cell 115, luminance calculation unit 116 and digital driving levels output unit 117 is corrected and may be disposed at projection
In the controller 110 of machine 100.For example, said units can be program, software or firmware for being installed in controller 110 etc.
Deng, but the present invention is not limited thereto.
In trimming process, controller 110 can control video frequency signal processing chip 130 and not correct digital drive according to difference
Level exports the complete white picture of different brightness, with profit correction.After the completion of correction, controller 110 can control at vision signal
Reason chip 130 exports the picture for meeting GTG standard display function according to digital driving levels have been corrected.
In some embodiments, external device (ED) (such as mobile phone, video signal generator, notebook computer etc.) can lead to
Cross image transmission interface 150 and transmit picture to vision signal front-end circuit 120.Vision signal front-end circuit 120 can be by this picture
Be converted to the form suitable for image projection module 140.For example, vision signal front-end circuit 120 can be by analog form
Picture is converted to the picture of digital form.In trimming process, external device (ED) sends the picture of vision signal front-end circuit 120 to
Face can be full white image.
In some embodiments, video frequency signal processing chip 130 can receive what vision signal front-end circuit 120 was transmitted
Picture, and can adjust the quality of this picture.For example, the resolution or color of the regulating picture of video frequency signal processing chip 130
Color saturation degree etc., but the present invention is not limited thereto.In some embodiments, memory 170 can be as vision signal at
Reason chip 130 carries out the buffer storage needed for (such as adjusting resolution) during signal transacting.
In some embodiments, video frequency signal processing chip 130 need not receive vision signal front-end circuit 120 and be transmitted
Picture, and can voluntarily provide picture.For example, video frequency signal processing chip 130 can voluntarily produce the monochrome of given luminance
Or full white image.
In some embodiments, the picture that image projection module 140 can be transmitted video frequency signal processing chip 130 is thrown
It is incident upon projectual 300.Specifically, image projection module 140 can include a display panel 142,144 groups of a rear lens, one
The preceding projection light source 148 of lens group 146 and one.Preceding lens group 146, display panel 142 and rear lens group 144 are sequentially arranged at throwing
In the light path of the radiating light of shadow light source 148.Projection light source 148 is electrically connected with apparatus for lighting up circuit 160.Display panel 142 electrically connects
Video frequency signal processing chip 130 is connect, and the picture that video frequency signal processing chip 130 is transmitted can be received.When apparatus for lighting up circuit 160
During conducting, the meeting radiating light of projection light source 148, and light can sequentially pass through preceding lens group 146, display panel 142 and rear lens group
144, the picture on display panel 142 is projected on projectual 300.
In some embodiments, brightness sensing device 200 can for luminance meter (photometer or light-meter) or
Brightness impression device (photo-sensor) etc., but the present invention is not limited thereto.In some embodiments, projectual
300 can be cloth curtain or wall etc., but the present invention is not limited thereto.
Fig. 6 illustrates the schematic diagram of the optical projection system according to another embodiment of the invention.As shown in fig. 6, present embodiment
It is with Fig. 1 Main Differences：Present embodiment can also include a computer 500.Computer 500 be electrically connected at projector 100 with
Between brightness sensing device 200.Specifically, computer 500 connects projector 100 using the first sub- connecting line 410, and utilizes
The second sub- connection of connecting line 420 brightness sensing device 200.The connecting interface 104 of first sub- connecting line 410 and projector 100 (can
Refering to Fig. 3) same specification, therefore computer 500 can be connected by connecting interface 104 and control projector 100.
Fig. 7 illustrates the functional block diagram of the optical projection system according to another embodiment of the invention.As shown in fig. 7, computer 500
The controller 110 for being functionally similar to Fig. 2, its can comprising does not correct digital driving levels output unit 510, characteristic curve calculate
Unit 520, correction unit 530, GTG standard display function storage element 540, picture fixed cell 550, luminance calculation unit
560 and digital driving levels output unit 570 is corrected.That is, the executable function of computer 500 is such as the control in Fig. 2
Device 110 processed and hereinbefore related narration are contained, therefore not repeated description herein.Said units can be to be installed in computer 500
Program, software or firmware etc., but the present invention is not limited thereto.In present embodiment, because correction program is by computer 500
To perform, therefore the burden of projector 100 can be reduced.
In some embodiments, computer 500 can be desktop computer, notebook computer, tablet personal computer, Smartphone
Or personal digital assistant (PDA) etc., but the present invention is not limited thereto.
Fig. 8 illustrates the flow chart of the bearing calibration of the projector according to an embodiment of the present invention.As shown in figure 8, this reality
The bearing calibration for applying mode can be as follows comprising step：
In step 610, by projector different when not correcting under digital driving levels, projection image is to being thrown respectively
At least part region of shadow thing.Specifically, projector can not correct digital driving levels according to different, project different brightness
Picture to projectual.
In step 620, when projector when not correcting under digital driving levels, utilizes a brightness sensing different respectively
Device senses a luminance parameter in above-mentioned at least part region, to obtain a characteristic curve of projector.Specifically, projection is worked as
When not correcting digital driving levels change of machine, senses the luminance parameter on projectual, then using brightness sensing device
Digital driving levels and its corresponding luminance parameter can not be corrected according to all, produce characteristic curve.
In step 630, a correction program can be carried out according to characteristic curve and GTG standard display function, it is each to obtain
Do not correct the correction digital driving levels corresponding to digital driving levels, and these can not corrected to digital driving levels and
Correction digital driving levels make look-up table (Look-up Table, LUT).
In step 640, projector can be made in the case where having corrected digital driving levels, another picture is projected to projectual
Above-mentioned at least part region.
Specific bearing calibration see Fig. 9 and Figure 10, Fig. 9 illustrate the school of the projector according to an embodiment of the present invention
The flow chart of the previous operations 700 of correction method, Figure 10 illustrates the bearing calibration of the projector according to an embodiment of the present invention
The flow chart of rearmounted operation 710.As shown in figure 9, previous operations 700 are as follows comprising step：
In step 701, start previous operations 700.
In step 702, fixed image size.Specifically, throwing can be utilized after first adjustment picture size to required size
Picture fixed cell in shadow machine or the computer of outside, controls the size of image projection module fixed image.
In step 703, it is possible to provide do not correct the minimum value of digital driving levels.Specifically, can be by not correcting numeral
Drive level output unit, which is exported, not to be corrected the minimum values of digital driving levels and gives image projection module.
In step 704, the luminance parameter not corrected herein under digital driving levels can be sensed and stored.Specifically,
The luminance parameter of the picture on projectual can be sensed or sensed by brightness sensing device.
In step 705, it can improve and not correct digital driving levels.Specifically, can be by not correcting drive level output
What unit increased unit does not correct digital driving levels.For example, if the form of digital driving levels is 8, count
Word drive level DDL can be met：0≤DDL≤255, and DDL is integer, and in step 705, the number of a unit can be increased
Word drive level, for example, become 1 by 0.
In step 706, it can check and not correct whether digital driving levels are less than maximum.Specifically, non-correction number
Word drive level output unit can check that what it was exported does not correct whether digital driving levels are less than maximum, for example,
If the form of digital driving levels is 8, it can check whether it is less than 255.If digital driving levels are less than maximum (for example：
255) when, then return in step 704；If digital driving levels are equal to maximum (for example：255) when, then into step 707.
In step 707, the maximum and minimum value of luminance parameter sensed can be taken off.Specifically, can be by characteristic
Curve computation unit takes out the maximum and minimum value of luminance parameter, and by all luminance parameters and non-correction number in this interval
Word drive level is fabricated to characteristic curve C2 (see Fig. 4).
In step 708, obtain the above-mentioned luminance parameter of correspondence in GTG standard display function maximum and minimum value it
Between section.Specifically, GTG standard can be obtained from GTG standard display function storage element by correction unit and shows letter
Several curve C1 (see Fig. 4), and obtain the section between the maximum and minimum value of above-mentioned luminance parameter.
After the completion of previous operations 700, the curve C1 of characteristic curve C2 and GTG standard display function can obtain.Then may be used
Into rearmounted operation 710, as shown in Figure 10, rearmounted operation 710 is as follows comprising step：
In step 711, it is possible to provide do not correct the minimum value of digital driving levels.Specifically, can be by not correcting numeral
Drive level output unit, which is exported, not to be corrected the minimum values of digital driving levels and gives correction unit.
In step 712, it can obtain in step 711 and do not correct digital driving levels correspondence to GTG standard display function
Curve C1 on one first luminance parameter.For example, Fig. 4 is see, it can be point i on the diagram that drive level is not corrected, and
Its first luminance parameter on the curve C1 of GTG standard display function is point j.
In step 713, second luminance parameter equal with the first luminance parameter is obtained on characteristic curve C2, and by spy
Linearity curve C2 is obtained and is recorded the correction digital driving levels corresponding to the second luminance parameter.For example, Fig. 4 is see,
Correction unit can be obtained and point k contour point j on characteristic curve C2, then corrected digital driving levels in figure by point k
On point l.
In step 714, it can improve and not correct digital driving levels.Specifically, can be by not correcting drive level output
What unit increased unit does not correct digital driving levels.For example, if the form of digital driving levels is 8, count
Word drive level DDL can be met：0≤DDL≤255, and DDL is integer, and in step 705, the number of a unit can be increased
Word drive level, for example, become 1 by 0.
In step 715, it can check and not correct whether digital driving levels are less than maximum.Specifically, non-correction number
Word drive level output unit can check that what it was exported does not correct whether digital driving levels are less than maximum, for example,
If the form of digital driving levels is 8, it can check whether it is less than 255.If digital driving levels are less than maximum (for example：
255) when, then return in step 712；If digital driving levels are equal to maximum (for example：255) when, then into step 716.
In step 716, record can be stored and do not correct digital driving levels and corrected the look-up table of digital driving levels.
Specifically, correction unit, which can be stored, each does not correct digital driving levels (such as point i) in Fig. 4 and its corresponding with school
Positive digital drive level (such as the point l) in Fig. 4, and it is fabricated to look-up table.
In step 717, terminate the flow of this bearing calibration.
After the completion of previous operations 700 and rearmounted operation 710, the exportable school of digital driving levels output unit has been corrected
Positive digital drive level gives image projection module, so that image projection module, which can be projected, meets GTG standard display function
Picture or image.
Although the present invention is disclosed above with embodiment, so it is not limited to the present invention, any to be familiar with this skill
Person, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations, therefore protection scope of the present invention is worked as
Depending on appended claims, the person of defining is defined.
Claims (11)
1. a kind of optical projection system, comprising：
One projector；
One does not correct digital driving levels output unit, to make the projector not corrected under digital driving levels in different,
At least part region of a picture a to projectual is projected respectively；
One brightness sensing device, to when the projector respectively in described do not correct under digital driving levels when, sense this at least
One luminance parameter of subregion；
One characteristic curve computing unit, not correct digital driving levels and the luminance parameter according to, obtains the throwing
One characteristic curve of shadow machine；
One correction unit, it is every to obtain to carry out a correction program according to the characteristic curve and a GTG standard display function
One corresponding to digital driving levels is not corrected described in one and has corrected digital driving levels；And
One has corrected digital driving levels output unit, to make the projector in the case where this has corrected digital driving levels, projection
Another picture is at least part region of the projectual；
One picture fixed cell, to fix the size of the picture, and makes the characteristic curve computing unit in the size of the picture
The characteristic curve under fixation, is obtained, and makes the correction unit in the case where the size of the picture is fixed, the correction journey is carried out
Sequence.
2. optical projection system as claimed in claim 1, the wherein correction program performed by the correction unit are included：
There is provided and do not correct digital driving levels described in one；
Obtain this and do not correct digital driving levels correspondence to one first luminance parameter on the GTG standard display function；
One second luminance parameter equal with first luminance parameter is obtained on the characteristic curve；And
Digital driving levels have been corrected as this corresponding to the characteristic curve obtains second luminance parameter.
3. optical projection system as claimed in claim 1, in addition to：
The luminance parameter that one luminance calculation unit, the wherein brightness sensing device are sensed is a brightness value, the brightness calculation
Unit is used to the yield value according to the brightness value and at least part region, obtains a brightness value of the picture.
4. optical projection system as claimed in claim 1, wherein this does not correct digital driving levels output unit, the characteristic curve meter
Calculate unit and the correction unit is arranged in the projector.
5. optical projection system as claimed in claim 1, in addition to：
One computer, is electrically connected with the projector, and wherein this does not correct digital driving levels output unit, the characteristic curve and calculates single
Member and the correction unit are arranged in the computer.
6. a kind of projector, comprising：
One image projection module；
One does not correct digital driving levels output unit, and digital drive electricity is not corrected to make the image projection module different
Under flat, at least part region of a picture a to projectual is projected respectively；
One characteristic curve computing unit, is sensed not correct digital driving levels according to a brightness sensing device
A luminance parameter, obtain a characteristic curve of the projector；And
One correction unit, it is every to obtain to carry out a correction program according to the characteristic curve and a GTG standard display function
One corresponding to digital driving levels is not corrected described in one and has corrected digital driving levels；
One has corrected digital driving levels output unit, and digital driving levels have been corrected to make the image projection module at this
Under, another picture is projected at least part region of the projectual；And
One picture fixed cell, to fix the size of the picture, and makes the characteristic curve computing unit in the size of the picture
The characteristic curve under fixation, is obtained, and makes the correction unit in the case where the size of the picture is fixed, the correction journey is carried out
Sequence.
7. projector as claimed in claim 6, the wherein correction program performed by the correction unit include：
There is provided and do not correct digital driving levels described in one；
Obtain this and do not correct digital driving levels correspondence to one first luminance parameter on the GTG standard display function；
One second luminance parameter equal with first luminance parameter is obtained on the characteristic curve；
Digital driving levels have been corrected as this corresponding to the characteristic curve obtains second luminance parameter.
8. projector as claimed in claim 6, in addition to：
The luminance parameter that one luminance calculation unit, the wherein brightness sensing device are sensed is a brightness value, the brightness calculation
Unit is used to the yield value according to the brightness value and at least part region, obtains a brightness value of the picture.
9. a kind of bearing calibration of projector, its step is included：
When not correcting under digital driving levels, a picture a to projectual is projected respectively at least different by a projector
Subregion；
When the projector respectively in described do not correct under digital driving levels when, sense at least portion using a brightness sensing device
A subregional luminance parameter, to obtain a characteristic curve of the projector；
One correction program is carried out according to the characteristic curve and a GTG standard display function, to obtain each described not correcting numeral
One corresponding to drive level has corrected digital driving levels；And
Make the projector in the case where this has corrected digital driving levels, project another picture at least part area of the projectual
Domain,
Wherein in the case where the size of the picture is fixed, obtain the characteristic curve and carry out the correction program,
Wherein described bearing calibration also includes：After the size of the picture changes, retrieve the characteristic curve and re-start
The correction program.
10. the bearing calibration of projector as claimed in claim 9, the wherein correction program are included：
There is provided and do not correct digital driving levels described in one；
This is obtained not correct corresponding to digital driving levels to one first luminance parameter on the GTG standard display function；
One second luminance parameter equal with first luminance parameter is obtained on the characteristic curve；And
Digital driving levels have been corrected as this corresponding to the characteristic curve obtains second luminance parameter.
11. the bearing calibration of projector as claimed in claim 9, the wherein luminance parameter are a brightness value, and the correction side
Method also includes the yield value according to the brightness value and at least part region, obtains a brightness value of the picture.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310096489.2A CN104065901B (en) | 2013-03-22 | 2013-03-22 | Optical projection system, projector and its bearing calibration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310096489.2A CN104065901B (en) | 2013-03-22 | 2013-03-22 | Optical projection system, projector and its bearing calibration |
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| CN104065901B true CN104065901B (en) | 2017-08-22 |
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| CN104635408B (en) | 2015-03-11 | 2016-04-20 | 青岛海信电器股份有限公司 | A kind of method of projection arrangement, optical projection system and adjustment projection systems project brightness |
| CN113589629B (en) * | 2020-04-30 | 2022-12-27 | 华为技术有限公司 | Projection display device and calibration method thereof |
| CN115277966B (en) * | 2021-04-30 | 2023-12-08 | 苏州佳世达光电有限公司 | 3D scanning correction system and 3D scanning correction method |
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| CN1881069A (en) * | 2005-06-17 | 2006-12-20 | 乐金电子（沈阳）有限公司 | Picture size adjusting device and method for projector |
| CN101271251A (en) * | 2007-03-21 | 2008-09-24 | 北京泰德富臣科贸有限公司 | Single-slice transmission type projector system |
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| EP1587049A1 (en) * | 2004-04-15 | 2005-10-19 | Barco N.V. | Method and device for improving conformance of a display panel to a display standard in the whole display area and for different viewing angles |
| EP1662477A1 (en) * | 2004-11-26 | 2006-05-31 | Barco N.V. | Test or calibration of displayed greyscales |
| US8519956B2 (en) * | 2006-07-10 | 2013-08-27 | Koninklijke Philips N.V. | System and method for DICOM compliant display of ultrasound images in varying ambient light |
| JPWO2008015903A1 (en) * | 2006-08-04 | 2009-12-17 | コニカミノルタエムジー株式会社 | Image display method and image display apparatus |
| US20090115915A1 (en) * | 2006-08-09 | 2009-05-07 | Fotonation Vision Limited | Camera Based Feedback Loop Calibration of a Projection Device |
| US8659585B2 (en) * | 2009-10-16 | 2014-02-25 | Nikon Corporation | Projector apparatus and projection image correcting program product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1881069A (en) * | 2005-06-17 | 2006-12-20 | 乐金电子（沈阳）有限公司 | Picture size adjusting device and method for projector |
| CN101271251A (en) * | 2007-03-21 | 2008-09-24 | 北京泰德富臣科贸有限公司 | Single-slice transmission type projector system |
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