CN102799053A - Projector and trapezoidal distortion correction method thereof - Google Patents
Projector and trapezoidal distortion correction method thereof Download PDFInfo
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- CN102799053A CN102799053A CN2012102023615A CN201210202361A CN102799053A CN 102799053 A CN102799053 A CN 102799053A CN 2012102023615 A CN2012102023615 A CN 2012102023615A CN 201210202361 A CN201210202361 A CN 201210202361A CN 102799053 A CN102799053 A CN 102799053A
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- projector
- parameter value
- passive device
- keystone
- zoom ring
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Abstract
The invention provides a projector and a trapezoidal distortion correction method thereof. By adoption of the method, trapezoidal distortion correction can be accurately performed when lens focal length parameters of the projector are changed. The projector comprises a lens group, a mechanical adjustable passive device, a transmission device and a processor, wherein the lens group is provided with a zoom ring for focusing; the mechanical adjustable passive device is provided with an adjustment part; when the adjustment part rotates, parameter values of the mechanical adjustable passive device are changed; when the zoom ring rotates, the adjustment part is driven by the transmission device to rotate; and the processor sets the trapezoidal correction value of the projector according to the parameter values of the mechanical adjustable passive device. The parameter values of the mechanical adjustable passive device are changed along with the change of a focal length of the lens group, the processor sets the trapezoidal correction value of the projector according to the parameter values of the mechanical adjustable passive device, and the change of the focal length is directly used for trapezoidal distortion, so the trapezoidal distortion is comprehensive and accurate, and requirements of a user are met.
Description
Technical field
The present invention relates to a kind of projector and keystone distortion correction method thereof.
Background technology
At present, projector major part on the market all has the keystone function, and the board that its purpose is to make projector is done keystone different when setting up angle automatically, and it is trapezoidal to prevent that projected picture from occurring.But the projector of above-mentioned functions can not solve disadvantage: when the user adjusts size and the sharpness of picture through the focal length of adjustment camera lens; Can cause the error of automatic keystone because of the variation of lens focus parameter, and then make automatic trapezoidal calibration function normally not use.At present, be head it off, occur some patents on the market; Generally be to utilize video camera, light sensation, distance sensing device etc., compensate the keystone value with counter the pushing away of actual measurement, complex structure; Cost is higher; And be converted into some difficulty of product from technical know-how, and make patented claim similar products also not occur on the market, back for many years, can not meet consumers' demand.
Therefore, be necessary to design a kind of new projector and keystone distortion correction method thereof, to overcome above-mentioned defective.
Summary of the invention
The object of the present invention is to provide a kind of projector and keystone distortion correction method thereof, make and when the lens focus parameter of projector changes, also can accurately carry out keystone correction.
Technical scheme provided by the invention is a kind of projector, comprises that lens group has the zoom ring that is used to focus; Mechanical type adjustable passive device has adjusting portion, and when this adjusting portion rotated, its parameter value can change; Gearing drives the rotation of said adjusting portion through said gearing when the rotation of this zoom ring; Processor, its parameter value according to this mechanical type adjustable passive device is provided with the keystone amount of this projector.
Another kind of technical scheme provided by the invention is a kind of keystone distortion correction method of projector, may further comprise the steps, and the first step provides like the described projector of first technical scheme; Second goes on foot, and detects the parameter value of the mechanical type adjustable passive device of this projector; In the 3rd step, the processor of this projector receives the information of this parameter value, and the keystone amount of definite projector; In the 4th step,, carry out keystone and handle according to this keystone amount.
Compared with prior art; A kind of projector of the present invention and keystone distortion correction method thereof; Through gearing is set; Realize the synchronization action of the adjusting portion of zoom ring and mechanical type adjustable passive device, and then realize that the parameter value of mechanical type adjustable passive device changes along with the variation of the focal length of lens group, so the variation of this parameter value reflects the variation of focal length; Processor is provided with the keystone amount of projector according to the parameter value of mechanical type adjustable passive device, indirectly the variation of focal length is included in the limit of consideration of keystone, makes keystone more comprehensive and accurate, meets consumers' demand; In addition, the present invention only need realize function of the present invention through gearing and mechanical type adjustable passive device, and it is simple in structure, and cost is low, is convenient to maintenance and changes parts.
To combine accompanying drawing and specific embodiment below, two technical schemes of the present invention will be done concrete description.
Description of drawings
Fig. 1 is the structure principle chart of a kind of projector of technical scheme of the present invention.
Fig. 2 is the parameter value of a kind of projector of technical scheme of the present invention and the respective value complete list of keystone amount.
Fig. 3 is the funtcional relationship and the corresponding keystone amount complete list of parameter value variation amount with the focal length variations amount of a kind of projector of technical scheme of the present invention.
Fig. 4 is the front view of second embodiment of a kind of projector of technical scheme of the present invention.
Fig. 5 is the left view of projector shown in Figure 4.
Fig. 6 is the structure diagram of the 3rd embodiment of a kind of projector of technical scheme of the present invention.
Fig. 7 is the structure diagram of the 4th embodiment of a kind of projector of technical scheme of the present invention.
Fig. 8 is the keystone distortion correction method process flow diagram of a kind of projector of another technical scheme of the present invention.
Embodiment
For making the object of the invention, structure, characteristic and method thereof there are further understanding, cooperate embodiment to specify as follows now.
With reference to shown in Figure 1, disclosed a kind of projector of first technical scheme of the present invention, comprise that lens group 1 has the zoom ring 10 that is used to focus; Mechanical type adjustable passive device 3 has adjusting portion 30, and when this adjusting portion 30 rotated, its parameter value T1 can change; Gearing 2 rotates through the said adjusting of said gearing 2 drives portion 30 when this zoom ring rotation; Processor 4, its parameter value T1 according to this mechanical type adjustable passive device 3 is provided with the keystone amount of this projector.In the present embodiment; The variation of zoom ring 10 passes to adjusting portion 30 synchronously through gearing 2; Cause the variation of parameter value T1; Therefore the rotation of zoom ring 10 has been explained in the variation of parameter value T1, also is the variation (well-known, the purpose of regulating the zoom ring is in order to focus) of the focal length of lens group 1.Thereby, make when processor is provided with the keystone amount of this projector, with the change calculations of focal length therein, make keystone more comprehensively and accurately.In addition, according to the variation of parameter value T1, can calculate the variation of focal length, thereby the personage in the industry is easy to utilize light path design principles such as lens group focal length, just can calculate the keystone amount easily, its principle just repeats no more.
Above-mentioned mechanical type adjustable passive device can be resistance, inductance or electric capacity, can according to parameter value, confirm the keystone amount with the variable quantity of resistance value, inductance value, capacitance as parameter value.
In addition, this processor 4 obtains correcting value that should parameter value through the mode of tabling look-up, and this table content can directly be arranged in the processor 4 as source program by design producer autonomous Design.Its principle is: processor 4 obtains parameter value T, through with built-in form in the parameter value of setting compare, draw the keystone amount.For example, also please refer to shown in Figure 2ly, when the parameter value T that receives this mechanical type adjustable passive device 3 when processor is 100 ohm, tables look-up and to know that then corresponding keystone correction amount is 5 degree.Present embodiment, directly the mode through tabling look-up obtains the corresponding keystone amount of parameter value, and system program is carried out simple, does not take too many internal memory; And the table contents attribute can be adjusted by designer's design, conveniently manufactures and designs.
Preferably, in the present technique scheme, the variable quantity of parameter value T becomes linear function relation with the variable quantity of focal length L, for example can be designed to 100 ohm of the parameter value variation that revolution 10 is spent mechanical type adjustable passive device then, and optical focal length changes 3mm; The variable quantity T of parameter value T wherein
0Variable quantity L with focal length L
0Become linear function relation: L
0=3T
0/ 100, L wherein
0Unit be mm, T
0Unit be ohm.The variation funtcional relationship corresponding with the variation of focal length L of more parameter value T is also please with reference to Fig. 3, according to the variable quantity T of the parameter value T that detects
0, apply mechanically corresponding functional relation, calculate the variable quantity L of focal length L
0Significantly can see the variable quantity L of focal length L among the figure
0Less relatively, and the variation T of parameter value
0Relatively large, the variable quantity T of parameter value for example
0When being 100 ohm, the changing value T of focal length L
0Be 3mm.This scheme can directly be reflected the variation of focal length by the variation of parameter T, and is relatively more directly perceived; In addition,, can cause the slight variation of focal length, but not obvious from the naked eyes, but utilize the linear function relation, can the variation with the parameter value T of bigger numerical of the subtle change of focal length be embodied, be convenient to designer or user and find when the fine setting of zoom ring.
Wherein, in the foregoing description, processor 4 also can the funtcional relationship through this parameter value and projector focal length calculates the correcting value that obtains should parameter value.Wherein, this processor is built-in with operation program, and this operation program is to draw corresponding focal length variations amount according to parameter value, draws the keystone amount again, carries out keystone.For example; With reference to shown in Figure 3; (certainly, the parameter value when producer can be defined in original state voluntarily was according to comparing of parameter value that detects and initial parameter value when the variable quantity that receives the parameter value T of this mechanical type adjustable passive device 3 when processor was 100 ohm; Draw variable quantity), according to the variable quantity L of focal length L
0Variable quantity T with parameter value T
0Between funtcional relationship L
0=3T
0/ 100, calculate the focal length variations amount L of projector
0Be 3mm,, draw keystone amount 5 degree then by the value of processor according to focal length.Present embodiment is directly changed into the variation of the focal length of projector through the variation of rotating the zoom ring parameter value of the adjusting portion that causes; The keystone amount corresponding according to focal length variations; Automatically carry out keystone, made things convenient for design, strengthened the versatility of present technique scheme in existing projector.
With reference to Fig. 4 and shown in Figure 5, be the structure diagram of second embodiment of a kind of projector of technical scheme of the present invention.Among the figure; Gearing 2 is a drive link, comprises first end 20 and second end 21, and its first end 20 also is connected with gear 22; First end 20 is fixed on the end face of gear 22; And the central point of point of fixity and gear can rotate along with the rotation of gear 22 not on same point, rotates thereby also can drive second end 21; This gear 22 is meshed with the gear teeth on zoom ring 10 surfaces, when the gear teeth of zoom ring 10 rotate, can rotate by driven gear 22, rotates thereby drive first end 20; Its second end 21 is fixed in the adjusting portion 30, can drive adjusting portion and rotate.In the present embodiment,, the rotational synchronization of zoom ring is delivered to first end 20 of gearing 2 through gear-driven mode; Second end 21 also drives the rotation of adjusting portion 30 along with the rotation of first end, thereby realizes the interlock of adjusting portion 30 and zoom ring 10.
Certainly, also can utilize the bel-drivenn mode, realize the interlock of adjusting portion 30 and zoom ring 10.With reference to shown in Figure 6, be the third embodiment of the present invention, be with the difference of above-mentioned second embodiment; Gear 22 is connected with power wheel 23, and power wheel can synchronously rotate along with the rotation of gear 22, and an end of belt 2 is installed on the power wheel 23; The other end is connected in the adjusting portion 30; When power wheel 23 rotates, drive adjusting portion 30 through belt 2 and rotate, realize the interlock of adjusting portion 30 and zoom ring 10.
In addition, in practice, the position relation according to zoom ring and adjusting portion also can adopt vertical ways of connecting.For example; With reference to shown in Figure 7, be the structure diagram of the 4th embodiment of a kind of projector of technical scheme of the present invention, disclosed the structural representation that gearing connects zoom ring and adjusting portion respectively; All sides of first end 20 of gearing 2 are provided with the gear teeth among the figure; Can be meshed with zoom ring 10 gear teeth, second end 21 is connected with adjusting portion 30, directly drives adjusting portion 30 by zoom ring 10 through gearing 2 and rotates.In addition; Second end 21 and adjusting portion 30 are provided with the structure of the bottle opener shape that matches; For example, second end 21 can be the convexity or the groove of " ten " word shape, also can be " one " word shape convexity or groove; Adjusting portion 30 then is provided with corresponding shape, rotates so that can drive adjusting portion 30 during the rotation of second end 21.
Referring to shown in Figure 8; Be another technical scheme of the present invention; Disclosed a kind of keystone distortion correction method of projector, may further comprise the steps, first step S1; The described projector like the arbitrary embodiment of first technical scheme is provided, has lens group, mechanical type adjustable passive device, processor and gearing; Second goes on foot S2, detects the parameter value T1 of the mechanical type adjustable passive device of this projector; The 3rd step S3, the processor of this projector receives the information of this parameter value, and the keystone amount T2 of definite projector; The 4th step S4 according to this keystone amount, carries out keystone and handles.
Above-mentioned projector is the described projector of the present invention's first scheme, and promptly any embodiment described in first scheme all is applicable to the present invention's second technical scheme.
The present invention is described by above-mentioned related embodiment, yet the foregoing description is merely the example of embodiment of the present invention.Must be pointed out that the embodiment that has disclosed does not limit scope of the present invention.On the contrary, change and retouching not breaking away from the spirit and scope of the present invention to be done all belong to scope of patent protection of the present invention.
Claims (9)
1. projector is characterized in that: comprises,
Lens group has the zoom ring that is used to focus;
Mechanical type adjustable passive device has adjusting portion, and when this adjusting portion rotated, its parameter value can change;
Gearing drives the rotation of said adjusting portion through said gearing when the rotation of this zoom ring;
Processor, its parameter value according to this mechanical type adjustable passive device is provided with the keystone amount of this projector.
2. projector as claimed in claim 1 is characterized in that: this gearing is provided with gear with the end that this zoom ring is connected, and the gear teeth of this gear and zoom ring surface are meshed.
3. projector as claimed in claim 1 is characterized in that: an end of this gearing is provided with a subtype structure that cooperates with this adjusting portion.
4. projector as claimed in claim 1 is characterized in that: this processor obtains correcting value that should parameter value through the mode of tabling look-up.
5. projector as claimed in claim 1 is characterized in that: the variable quantity of this parameter value becomes the linear function relation with the variable quantity of projector focal length.
6. projector as claimed in claim 5 is characterized in that: the funtcional relationship of this processor through this parameter value and projector focal length calculated the correcting value that obtains should parameter value.
7. projector as claimed in claim 1 is characterized in that: this mechanical type adjustable passive device is resistance, inductance or electric capacity.
8. projector as claimed in claim 1 is characterized in that: this gearing connects this zoom ring and should conciliation portion respectively.
9. the keystone distortion correction method of a projector is characterized in that, may further comprise the steps,
The first step provides like each described projector of claim 1 to 8;
Second goes on foot, and detects the parameter value of the mechanical type adjustable passive device of this projector;
In the 3rd step, the processor of this projector receives the information of this parameter value, and the keystone amount of definite projector;
In the 4th step,, carry out keystone and handle based on this keystone amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210202361.5A CN102799053B (en) | 2012-06-19 | 2012-06-19 | Projector and trapezoidal distortion correction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210202361.5A CN102799053B (en) | 2012-06-19 | 2012-06-19 | Projector and trapezoidal distortion correction method thereof |
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| CN102799053A true CN102799053A (en) | 2012-11-28 |
| CN102799053B CN102799053B (en) | 2014-11-05 |
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| CN201210202361.5A Expired - Fee Related CN102799053B (en) | 2012-06-19 | 2012-06-19 | Projector and trapezoidal distortion correction method thereof |
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Cited By (5)
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| CN104683724A (en) * | 2015-03-03 | 2015-06-03 | 苏州佳世达光电有限公司 | Projecting device and correction method thereof |
| CN104811640A (en) * | 2015-04-29 | 2015-07-29 | 联想(北京)有限公司 | Projection control method and electronic equipment |
| CN109634032A (en) * | 2018-10-31 | 2019-04-16 | 歌尔股份有限公司 | Image processing method, device and equipment |
| CN109889751A (en) * | 2019-04-18 | 2019-06-14 | 东北大学 | Speech content portable photographic recording device based on optical zoom |
| WO2022062604A1 (en) * | 2020-09-28 | 2022-03-31 | 成都极米科技股份有限公司 | Projection screen adjusting method and apparatus, and projector, and storage medium |
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| CN109889751A (en) * | 2019-04-18 | 2019-06-14 | 东北大学 | Speech content portable photographic recording device based on optical zoom |
| CN109889751B (en) * | 2019-04-18 | 2020-09-15 | 东北大学 | Portable shooting and recording device for speech content based on optical zooming |
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Granted publication date: 20141105 Termination date: 20160619 |