CN205754673U - A kind of automatic focusing mechanism of projector - Google Patents
A kind of automatic focusing mechanism of projector Download PDFInfo
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- CN205754673U CN205754673U CN201521139134.8U CN201521139134U CN205754673U CN 205754673 U CN205754673 U CN 205754673U CN 201521139134 U CN201521139134 U CN 201521139134U CN 205754673 U CN205754673 U CN 205754673U
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- projector
- main control
- control chip
- light source
- motor
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Abstract
This utility model embodiment provides the automatic focusing mechanism of a kind of projector, wherein said device includes projector light source, motor and main control chip, it is provided with on described projector light source focus knob, described focus knob is rotated according to default stepper drive by described motor, described main control chip is electrically connected with described motor and described projector light source, the picture sample that described projector light source is gathered by described main control chip is analyzed, and assign control instruction according to the result analyzed to described motor, so that the drive of described motor is described, focus knob is rotated.The automatic focusing mechanism of a kind of projector that this utility model embodiment provides, it is possible to be automatically performed focus process when projector initializes, it is not necessary to user carries out the focus operation of complexity.
Description
Technical field
This utility model embodiment relates to Autofocus Technology field, particularly relates to a kind of projector
Automatic focusing mechanism.
Background technology
Projector is a kind of projection arrangement for amplifying display image.It is applied to meeting at present
Room is demonstrated and watches film on giant-screen by equipment such as connection DVD players in the family.
At the cinema, have started to replace the digital cinema projector of old cinematographic film too, be used as face
Screen to hard disk digital data.
The principle of projector display image can be as shown in Figure 1:
Light first is irradiated on image-displaying member produce image by projector, then passes through camera lens
Project.The image-displaying member of projector includes infiltration type and the profit utilizing printing opacity to produce image
The reflection-type of image is produced with reflection light.The most any type, is all to be divided by the light of projecting lamp
Become red, green, blue trichroism, then produce the image of shades of colour.Because element itself can only carry out list
Color shows, 3 pieces of elements therefore will be utilized to generate 3 colour contents respectively.Passing through prism the most again will
This 3 color image synthesizes an image, projects on screen finally by camera lens.
Currently commonly used projector often can be divided three classes: cathode ray tube (CRT) is thrown
Shadow instrument, liquid crystal display (LCD) projector and digital projection instrument.Wherein, CRT projector is made
For imaging equipment, it has been the earliest, has used most commonly used a kind of projector.This projector
Input signal source can be decomposed at R (red), G (green), the fluorescence of B (blue) three CRT tube
On screen, fluorescent material luminescent system under high pressure effect expands, gathers, shows five on giant-screen
Face six chromatic graph is drawn.
Being placed under electric field effect of the photoelectric effect of LCD projector use liquid crystal, i.e. liquid crystal molecule
Change, affect light transmittance or the reflectance of its liquid crystal cells, thus affect its optical property,
There is the picture differing gray-level and color.
Digital projection instrument then have employed Digital Light Processor, it is possible to the tonal gradation of picture is reached
256 to 1024 grades, color can also reach 2563To 10243Kind, its image quality presented is more
Adding stable, contrast and brightness are the most uniform.
Owing to distortion can occur because of the difference of projection angle in the picture of projector, therefore the most often
Can hang on ceiling by fixing for projector, remote controller can be used when needs use when
Open projector.At present when projector is focused, enter often by artificial method
Row operation.But it is the most inaccurate to carry out focusing by artificial method, and when projector hangs
Can be inconvenient time on ceiling.
As can be seen here, currently need one badly and can allow projector automatic focusing mechanism.
Utility model content
This utility model embodiment provides the automatic focusing mechanism of a kind of projector, it is possible at projector
Focus process it is automatically performed, it is not necessary to user carries out the focus operation of complexity during initialization.
This utility model embodiment provides the automatic focusing mechanism of a kind of projector, including projector light
Source, motor and main control chip, described projector light source is provided with to focus knob, described
Being rotated by described motor focus knob according to default stepper drive, described main control chip is with described
Motor and described projector light source are electrically connected with, and described main control chip is to described projector light
The picture sample that source gathers is analyzed, and assigns control according to the result analyzed to described motor
System instruction, rotates so that the drive of described motor is described focus knob.
The automatic focusing mechanism of the projector that this utility model embodiment provides, by projector light
The picture sample that source gathers is analyzed, and according to the analysis result definition to photo current sample
Judge, such that it is able to assign control instruction to motor, so that described motor band
Move and be arranged at focus knob being rotated on described projector light source, thus realize projector
Auto-focusing.
Further, this utility model embodiment passes through main control chip to picture sample characteristic of correspondence
Value calculates, and determines the rotation strategy that the eigenvalue calculated is corresponding, such that it is able to without
In the case of user starts, it is automatically performed the focusing to projector.
It addition, by arranging voice input module and voice output module, such that it is able to prompting user
Selecting multiple focusing schemes, it is final right that user then can carry out selecting by phonetic order
Burnt scheme, thus conveniently and efficiently projector is realized auto-focusing.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, under
Face is by introducing the most simply the accompanying drawing used required in embodiment or description of the prior art, aobvious
And easy insight, the accompanying drawing in describing below is embodiments more of the present utility model, for this area
From the point of view of those of ordinary skill, on the premise of not paying creative work, it is also possible to attached according to these
Figure obtains other accompanying drawing.
Fig. 1 is the principle schematic of projector display image；
The function of the automatic focusing mechanism of a kind of projector that Fig. 2 provides for this utility model embodiment
Module diagram.
Detailed description of the invention
For making the purpose of this utility model embodiment, technical scheme and advantage clearer, below will
In conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is entered
Row clearly and completely describes, it is clear that described embodiment is that this utility model part is implemented
Example rather than whole embodiments.Based on the embodiment in this utility model, the common skill in this area
The every other embodiment that art personnel are obtained under not making creative work premise, broadly falls into
The scope of this utility model protection.
The function mould of a kind of projector automatic focusing mechanism that Fig. 2 provides for this utility model embodiment
Block figure.
As in figure 2 it is shown, described device can include projector light source 1, motor 2 and master control
Chip 3, described projector light source 1 is provided with to focus knob 11, described to focus knob 11 by institute
State motor 2 to rotate according to default stepper drive, described main control chip 3 and described motor 2
And described projector light source 1 is electrically connected with.
In actual application scenarios, projector the most often needs to carry out projector light source
Preheating, the time of preheating is often at 5 to 10 minutes.In this utility model embodiment, Ke Yi
The initialization procedure to projector is completed in during this period of time.It is right i.e. to include in this initialization procedure
The auto-focusing of projector light source.
Specifically, described projector light source can gather the picture sample of Current projection, the most permissible
This picture sample is sent to described main control chip.Described main control chip can be to described picture sample
Definition be identified, if the definition of this picture sample does not meet pre-conditioned, then
Control instruction can be assigned to described motor.Described motor just can be according to described control
Instruction drive described focusing knob, with regulate described projector light source to coke number, until obtaining
The definition of the photo current sample taken meet pre-conditioned till.
In this utility model embodiment, it is single that described main control chip can include that image feature value calculates
Unit, for calculating the picture sample characteristic of correspondence value that described projector light source gathers.This feature value
Can be used to weigh the definition of picture sample.Specifically, described eigenvalue at least can include figure
As gradient or modulation transfer functions.
Wherein, described image gradient can represent the rate of change of gray scale in image.When picture is more clear
Time clear, the image gradient that this picture is corresponding is the biggest, and namely grey scale change is obvious.So
And when picture relatively obscures, the image gradient that this picture is corresponding then can be smaller, namely gray scale
Change the most obvious.In this utility model embodiment, the picture sample of collection can be carried out net
Lattice divide, such as, the picture sample of collection can be divided into the grid of 150*100.For dividing
After each grid, can calculate the average pixel value in this grid, and by calculate this is average
Pixel value is as the pixel value of this grid.Therefore, stress and strain model is the most, the pixel of this grid
Value just can be closer to real pixel value.
After pixel value in calculating each grid, just can calculate picture sample by following formula
This image gradient:
G (x, y)=dx (i, j)+dy (i, j)
Wherein, (x, y) can represent the image gradient of described picture sample to G, and dx (i, j) (j) may be used with dy by i
To be determined by following formula respectively:
Dx (i, j)=I (i+1, j)-I (i, j)
Dy (i, j)=I (i, j+1)-I (i, j)
Wherein, (i j) represents the pixel value of the grid of the i-th row jth row to I.
Described pixel value is specifically as follows rgb value.Rgb color pattern is a kind of color of industrial quarters
Standard, is by red (Red, R), green (Green, G), blue (Blue, B) three Color Channels
Change and their superpositions each other obtain color miscellaneous, RGB is i.e. generation
The color of three passages of table red, green, blue, also becomes three primary colors.This color mode almost includes
Human eyesight can all colours of perception, be to use one of the widest color system at present.Often
A kind of RGB standard in, 1 ten between amount 0-255 of each color of R, G, B is entered
Number processed represents (corresponding binary number 00000000～11111111).Another webpage is commonly used
In RGB standard, the rgb value of a pixel is identified by the hexadecimal number of 6, as
The form of #000000.Those skilled in the art are readily apparent that, the rgb color of a pixel is each
1 decimal number mark between amount 0-255 of color, can be converted to one 6 ten
Senary number represents, i.e. exists in different representation and there is one-to-one relationship.On the whole,
Obtain after the redness (R) of the corresponding number in these standards, green (G) and blue (B) mixing
The final Show Color of this pixel.
Such as, in this utility model embodiment, the pixel value of certain grid can be expressed as:
RGB(i,j)=(Ra,Gb,Bc)
Wherein, RGB(i,j)Represent the rgb value that the grid of the i-th row jth row is corresponding, Ra, Gb, Bc
It can be the default integer in 0-255.
In another embodiment of this utility model, described eigenvalue can also be described picture sample
Modulation transfer functions (MTF).Described modulation transfer functions can be by speckle in statistics picture sample
The size of point obtains.When projector projects, inaccurate due to coke number, can make
Some light deviate from imaging point and diffusion profile is around imaging point, thus define speckle.
It is to say, speckle is the biggest, then show that focus effects is the poorest.Under normal circumstances, speckle is only worked as
When point is less than the size of pixel, speckle just will not be by the perception of human eye institute, and such focusing state is then
It is reasonable.The size of described speckle can constitute impact to mtf value, therefore at this utility model
Embodiment can be represented the definition of picture sample by MFT value.Described MTF uses
It is the lines target of black and white gradually transition, is projected by camera lens.If the contrast of gained image
Just the same with test chart, its mtf value is 100%, but this is the optimal focusing in ideal
State, the most non-existent.If contrast is half, then mtf value is 50%.0 value is then
Representing contrast to completely lose, black and white line is reduced to single Lycoperdon polymorphum Vitt；When numerical value is more than 80%
Then can represent that focusing state is fine；Numerical value then represents that less than 30% focusing state is very poor.
So, the clear of picture sample can all be characterized by above-mentioned image gradient or mtf value
Degree, such that it is able to using described image gradient or mtf value as picture sample characteristic of correspondence value.
So, after calculating picture sample characteristic of correspondence value, the scope in described main control chip
Determine that the described eigenvalue calculated and the multiple range of characteristic values preset just can be carried out by unit right
Ratio, determines the First Eigenvalue scope belonging to described eigenvalue of calculating.Determining described feature
After the First Eigenvalue scope belonging to value, just can utilize the first rotation strategy in main control chip really
Cell, according to default range of characteristic values and the incidence relation rotating strategy, determines and described the
The first rotation strategy that one range of characteristic values is associated.In this utility model embodiment, can be pre-
First set up range of characteristic values and the corresponding relation rotating strategy.Such as, range of characteristic values 0.5 to
Between 0.7, corresponding rotation strategy is to turn clockwise 30 °.So, the of described main control chip
One instruction issuing unit just can rotate strategy according to described first and assign control to described motor
Instruction, described rotates focus knob to drive.Described control instruction can comprise rotation side
To with rotate stepping, described direction of rotation for example, clockwise, such as may be used by described rotation stepping
Think 5 °/time.The drive of described motor is described to be rotated focus knob, until the angle rotated
Till degree reaches the angle limited in the first rotation strategy.The most just can complete to projector from
Dynamic focusing.
In actual application scenarios, user is interested in certain details in picture sample sometimes,
The most described projector then needs to readjust coke number so that this details can be clearly envisioned.
Therefore, in this utility model one preferred embodiment, described main control chip may include that
First pair of coke number acquiring unit, for obtaining the picture sample gathered with described projector light source
First pair of coke number that middle first object region is corresponding；
Second pair of coke number acquiring unit, for determining the second mesh being positioned at described first object region
Mark region, and obtain the second pair coke number corresponding with described second target area；
Second instruction issuing unit, for according to described first pair of coke number and described second pair of coke number
Difference assigns control instruction to described motor, described rotates focus knob to drive.
Above-mentioned first object region can be such as the entirety of picture sample, the first couple of its correspondence
Coke number can be such as 10, and described second target area can be such as to show in this picture sample
Certain formula, then second pair of coke number that this formula is corresponding can be 15, then described first right
Difference between coke number and second pair of coke number just can be by assigning control instruction to described motor
It is adjusted.
In another preferred embodiment of this utility model, in order to avoid user to carry out loaded down with trivial details finger
Operation is assigned in order, can increase voice typing module 4 and voice is defeated in described automatic focusing mechanism
Going out module 5, wherein, described voice output module 5 is for playing the voice that described main control chip issues
Information, this information of voice prompt can point out user to choose in multiple focusing schemes suitably
Focusing scheme.Described motor, during focus knob is rotated by drive, often carries out one
Secondary correction, just can generate a focusing scheme.Repeatedly revise projector to coke number time, just
Can produce multiple focusing scheme, these focusing schemes all can correspond to definition and meet default bar
The focusing scheme of part, therefore can be supplied to user by these focusing schemes and select.
After user determines the focusing scheme of selection, just can be recorded by described voice typing module 4
The phonetic order of access customer, and described phonetic order is sent to described main control chip, so, institute
State main control chip just to choose from default multiple focusing schemes according to the phonetic order of user
The focusing scheme matched with described phonetic order.
Therefore, the automatic focusing mechanism of the projector that this utility model embodiment provides, passes through
The picture sample of projector light source collection is analyzed, and according to analysis result to photo current sample
This definition judges, such that it is able to assign control instruction to motor, so that described
Motor drives and is arranged at rotating focus knob on described projector light source, thus realizes
Auto-focusing to projector.
Further, this utility model embodiment passes through main control chip to picture sample characteristic of correspondence
Value calculates, and determines the rotation strategy that the eigenvalue calculated is corresponding, such that it is able to without
In the case of user starts, it is automatically performed the focusing to projector.
It addition, by arranging voice input module and voice output module, such that it is able to prompting user
Selecting multiple focusing schemes, it is final right that user then can carry out selecting by phonetic order
Burnt scheme, thus conveniently and efficiently projector is realized auto-focusing.
Each embodiment in this specification all uses the mode gone forward one by one to describe, between each embodiment
Identical similar part sees mutually, and what each embodiment stressed is to implement with other
The difference of example.For device embodiment, owing to it is substantially similar to method in fact
Executing example, so describe is fairly simple, relevant part sees the part of embodiment of the method and illustrates.
It is last it is noted that the above description to various embodiments of the present utility model is to describe
Purpose be supplied to those skilled in the art.It is not intended to exhaustive or is not intended to this reality
It is limited to single disclosed embodiment with novel.As it has been described above, various replacement of the present utility model
Will be apparent from for above-mentioned technology one of ordinary skill in the art with change.Therefore, though
So specifically discuss the embodiment of some alternatives, but other embodiment will be aobvious and easy
See, or those skilled in the art relatively easily draw.This utility model has been intended to be included in this
Of the present utility model all replacements, amendment and change through discussing, and fall in above-mentioned application
Spirit and scope in other embodiment.
Claims (4)
1. the automatic focusing mechanism of a projector, it is characterised in that including: projector light source, motor and main control chip；
It is provided with on described projector light source focus knob, described focus knob is rotated according to default stepper drive by described motor；
Described main control chip is electrically connected with described motor and described projector light source, the picture sample that described projector light source is gathered by described main control chip is analyzed, and assign control instruction according to the result analyzed to described motor, so that the drive of described motor is described, focus knob is rotated.
The automatic focusing mechanism of projector the most according to claim 1, it is characterised in that described device also includes:
The voice typing module being connected with described main control chip and voice output module.
The automatic focusing mechanism of projector the most according to claim 2, it is characterized in that, described voice output module is for playing the information of voice prompt that described main control chip issues, described voice typing module is for the phonetic order of typing user, and sends described phonetic order to described main control chip.
The automatic focusing mechanism of projector the most according to claim 3, it is characterised in that described main control chip is for choosing, from default multiple focusing schemes, the focusing matched with described phonetic order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521139134.8U CN205754673U (en) | 2015-12-30 | 2015-12-30 | A kind of automatic focusing mechanism of projector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521139134.8U CN205754673U (en) | 2015-12-30 | 2015-12-30 | A kind of automatic focusing mechanism of projector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915870A (en) * | 2015-12-30 | 2016-08-31 | 乐视致新电子科技（天津）有限公司 | Automatic focusing apparatus and method of projector |
| CN107911676A (en) * | 2017-11-28 | 2018-04-13 | 海信集团有限公司 | A kind of its focalization method and device for projector equipment |
-
2015
- 2015-12-30 CN CN201521139134.8U patent/CN205754673U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915870A (en) * | 2015-12-30 | 2016-08-31 | 乐视致新电子科技（天津）有限公司 | Automatic focusing apparatus and method of projector |
| CN107911676A (en) * | 2017-11-28 | 2018-04-13 | 海信集团有限公司 | A kind of its focalization method and device for projector equipment |
| CN107911676B (en) * | 2017-11-28 | 2020-03-27 | 海信集团有限公司 | Focal length adjusting method and device for projection equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20171230 |