CN104570568A - Automatic focusing method for projector - Google Patents
Automatic focusing method for projector Download PDFInfo
- Publication number
- CN104570568A CN104570568A CN201410809680.1A CN201410809680A CN104570568A CN 104570568 A CN104570568 A CN 104570568A CN 201410809680 A CN201410809680 A CN 201410809680A CN 104570568 A CN104570568 A CN 104570568A
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- Prior art keywords
- focusing
- projector
- zero point
- clear
- automatic focusing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
Abstract
The invention relates to an automatic focusing method for a projector. The method comprises the following steps: for the projector capable of forcing automatically, when re-focusing is required, finding and determining the clearest focusing parameter of a lens when the clearest projected image is obtained, adjusting the lens to back to a zero point, and moving the lens from the zero point until the lens reaches the position corresponding to the clearest focusing parameter, so as to compete automatic focusing. The focusing method has the advantages that the focusing accuracy is greatly improved since mechanical accumulated errors can be eliminated; by adopting the technical scheme, accuracy requirements for mechanical coordination are reduced, so that the manufacturing cost of the projector is further reduced.
Description
Technical field
The present invention relates to projector, more particularly, relate to a kind of projector automatic focusing method.
Background technology
Mostly traditional projector is to adopt the mode of manual focusing, but also has some new projector to have automatic focusing function, such as, of applicant at first utility model (Authorization Notice No.: CN203012335U; Authorized announcement date: on June 19th, 2013; Application number: 201220730223.X) in, disclose a kind of optical projection system of automatic focusing.This optical projection system comprises projection module, infrared monitoring module, the infrared light supply be loaded on projection module, and the focus control for driving the first lens set movable; The infrared light spot that infrared light supply sends preferably is projeced into projected picture inside or the edge of projection module, and can be sent to infrared monitoring module after reflecting; Analyzed by the infrared light spot picture sent by infrared light supply collected infrared monitoring module, control signal can be sent to focusing motor, adjust the first lens set to correct position, thus the function of automatic focusing can be reached.
In existing automatic focusing scheme, focusing being the state stopped after using from the last time, the sharpness of projected image can experience the search process progressively improving, reach the best, be progressively deteriorated, namely usual meeting stops searching after starting to be deteriorated, and record obtain described in most picture rich in detail time the most clear focusing parameter; Then again focus again based on this most clear focusing parameter, directly get back to the position corresponding to the most clear focusing parameter from current location.
But, more or less can there are some mechanical cumulative errorss in the part such as projection objective, focus control, focusing motor, these errors can affect focusing accuracy, cause above-mentioned automatic focusing scheme cannot meet the requirement of accurate focusing, or the precision needing machinery to coordinate is high especially, could meet the requirement of accurate focusing.
Summary of the invention
For the above-mentioned defect of prior art, the present invention will solve the problem that existing projector automatic focusing scheme cannot meet accurate focusing requirement.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of projector automatic focusing method, and wherein, described projector comprises the camera lens that at least one group can move forward and backward focusing in focusing range, also comprises the focusing motor driving lens moving; When needs are focused again, carry out automatic focusing according to the following steps:
S1, the most clear focusing parameter of camera lens when searching and determine to obtain the most clear projected image;
S2, zero point is got back in the adjustment of described camera lens, more mobile described camera lens, until position described in stopping at corresponding to the most clear focusing parameter, completes automatic focusing from described zero point.
In the described step S1 of projector automatic focusing method of the present invention, the most clear focusing parameter of camera lens when image analytical method can be adopted to search and determine to obtain the most clear projected image, concrete steps comprise:
S11, zero point is got back in the adjustment of described camera lens;
S12, to focus from described zero point, and the sharpness of projected image synchronously detected, until obtain most picture rich in detail, then record obtain described in most picture rich in detail time the most clear focusing parameter.
When adopting image analytical method, in described step S1, focus from described zero point, and when the sharpness of projected image is synchronously detected, the sharpness of described projected image can experience the process progressively improving, reach best, be progressively deteriorated, then record obtain described in most picture rich in detail time the most clear focusing parameter.
In the described step S1 of projector automatic focusing method of the present invention, the most clear focusing parameter of camera lens when telemetry can be adopted to search and determine to obtain the most clear projected image, particular by the projector distance measured between camera lens and projection screen, and then the most clear focusing parameter described in determining.
In projector automatic focusing method of the present invention, described zero point is the focusing starting point of described camera lens or terminal of focusing.It can be specifically the mechanical zero of lens focus, electronics zero point, optoelectronic induction zero point or electromagnetic induction zero point.
In projector automatic focusing method of the present invention, described focusing motor comprises step motor or servo motor.
In projector automatic focusing method of the present invention, when being judged to need again to focus during arbitrary situation below occurring: during (1) projector starting up; (2) when projector detects vibration or the displacement of self; (3) when the sharpness by detecting projected image every the schedule time finds that current projected picture is unintelligible; (4) by when schedule time detection projector distance finds that Current projection distance changes.
As can be seen from technical scheme of the present invention, the present invention is by first determining the most clear focusing parameter of camera lens, the position corresponding to the most clear focusing parameter of having recorded is directly targeted to again to carry out automatic focusing from zero point, the advantage of this focus adjustment method to eliminate mechanical cumulative errors, only start error remaining zero point, and to start error this zero point be constant value, so can not focusing accuracy be affected.After using this scheme, the accuracy requirement that machinery coordinates is reduced, thus the manufacturing cost of projector can be reduced further.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the process flow diagram of automatic focusing method of the present invention;
Fig. 2 is automatic focusing process flow diagram when adopting image analytical method.
Embodiment
The process flow diagram of automatic focusing method of the present invention as shown in Figure 1, in the present embodiment, after from step S100,
Step S101, judges whether to need again to focus, and if it is performs step S102, otherwise continues to keep detecting judgement state.Specifically, below appearance during arbitrary situation, can be judged to need again to focus: during (1) projector starting up; (2), when projector detects vibration or the displacement of self, the built-in sensors specifically by projector senses whether have vibration or displacement; (3) when the sharpness by detecting projected image every the schedule time finds that current projected picture is unintelligible, such as, detected once every 1 minute; (4) by when schedule time detection projector distance finds that Current projection distance changes.
Step S102, the most clear focusing parameter of camera lens when searching and determine to obtain the most clear projected image.
Step S103, gets back to zero point by camera lens adjustment.
Step S104, moving lens from zero point, until stop at the position corresponding to the most clear focusing parameter, completes automatic focusing.
A preferred embodiment of the invention as shown in Figure 2, this adopts the embodiment of image analytical method when searching and determine the most clear focusing parameter, and this focussing process scheme can of applicant at first utility model (Authorization Notice No.: CN203012335U; Authorized announcement date: on June 19th, 2013; Application number: 201220730223.X) disclosed in automatic focusing optical projection system on implemented.
In the present embodiment, from step S200.
Step S201, judges whether to need again to focus, and if it is performs step S202, otherwise continues to keep detecting judgement state.
Step S202, gets back to zero point by the Focussing of projector; Here said zero point, also can claim initial point, can be focusing starting point or the focusing terminal of described camera lens; It can be specifically the mechanical zero of lens focus, electronics zero point, optoelectronic induction zero point or electromagnetic induction zero point.
Step S203, carries out first round focusing, and synchronously detects the sharpness of projected image;
Step S204, by situation about synchronously detecting, judge to start after whether sharpness reaches the best to be deteriorated, specifically, in the process of carrying out focusing from zero point, the sharpness of projected image can experience the process progressively improving, reach the best, be progressively deteriorated; In the present embodiment, when the sharpness of projected image has just started progressively to be deteriorated, jump to step S205 immediately and stopped epicycle focusing.During concrete enforcement, after completing stroke of all focusing, just can also jump to step S205 and stop epicycle focusing.Certainly, rear a kind of mode can consume the more time, and embodiment illustrated in fig. 2 in when the sharpness of projected image has just started progressively to be deteriorated, immediately stop epicycle focusing, the time needed for focusing can be reduced.
Step S205, stops epicycle focusing, and the most clear focusing parameter when record obtains most picture rich in detail.When using focusing motor to drive projection objective to focus in projector, the most clear focusing parameter can be obtain described in most picture rich in detail time the step number of focusing motor or working time or angular displacement.Focusing motor can be step motor or servo motor.
Step S206, again adjusts the focal length of projector and gets back to zero point.
Step S207, re-starts focusing from zero point, and the position described in being directly targeted to corresponding to the most clear focusing parameter, complete automatic focusing.
As can be seen from above-described embodiment, for can the projector of automatic focusing, wherein get back to the mode at zero point by twice and carry out automatic focusing, focus from zero point for the first time, and the sharpness of projected image is synchronously detected, until acquire most picture rich in detail, the more clear focusing parameter that record is corresponding; Second time is then again get back to restart zero point to focus, and the position described in being directly targeted to corresponding to the most clear focusing parameter, complete automatic focusing.The advantage of this focus adjustment method to eliminate mechanical cumulative errors, only starts error a remaining zero point, and to start error this zero point be a constant value, so can not affect focusing accuracy.After using this scheme, the accuracy requirement that machinery coordinates is reduced, thus the manufacturing cost of projector can be reduced further.
The present invention is not limited to above-described embodiment, such as, in the step S102 shown in Fig. 1, the most clear focusing parameter of camera lens when telemetry also can be adopted to search and determine to obtain the most clear projected image, particular by the projector distance measured between camera lens and projection screen, and then the most clear focusing parameter described in determining.Subsequent step is identical with the flow process of Fig. 1.
Claims (9)
1. a projector automatic focusing method, is characterized in that, described projector comprises the camera lens that at least one group can move forward and backward focusing in focusing range, also comprises the focusing motor driving lens moving; When needs are focused again, carry out automatic focusing according to the following steps:
S1, the most clear focusing parameter of camera lens when searching and determine to obtain the most clear projected image;
S2, zero point is got back in the adjustment of described camera lens, more mobile described camera lens, until position described in stopping at corresponding to the most clear focusing parameter, completes automatic focusing from described zero point.
2. projector automatic focusing method according to claim 1, is characterized in that, in described step S1, and the most clear focusing parameter of camera lens when adopting image analytical method to search and determine to obtain the most clear projected image, concrete steps comprise:
S11, zero point is got back in the adjustment of described camera lens;
S12, to focus from described zero point, and the sharpness of projected image synchronously detected, until obtain most picture rich in detail, then record obtain described in most picture rich in detail time the most clear focusing parameter.
3. projector automatic focusing method according to claim 1, it is characterized in that, in described step S1, the most clear focusing parameter of camera lens when adopting telemetry to search and determine to obtain the most clear projected image, particular by the projector distance measured between camera lens and projection screen, and then the most clear focusing parameter described in determining.
4. the projector automatic focusing method according to any one of claim 1-3, is characterized in that, the most clear described focusing parameter is the step number of focusing motor or working time during most picture rich in detail described in obtaining.
5. projector automatic focusing method according to claim 4, is characterized in that, described zero point is the focusing starting point of described camera lens or terminal of focusing.
6. projector automatic focusing method according to claim 5, is characterized in that, described zero point is the mechanical zero of described lens focus, electronics zero point, optoelectronic induction zero point or electromagnetic induction zero point.
7. projector automatic focusing method according to claim 4, is characterized in that, described focusing motor comprises step motor or servo motor.
8. projector automatic focusing method according to claim 4, is characterized in that, when being judged to need again to focus during arbitrary situation below occurring: during (1) projector starting up; (2) when projector detects vibration or the displacement of self; (3) when the sharpness by detecting projected image every the schedule time finds that current projected picture is unintelligible; (4) by when schedule time detection projector distance finds that Current projection distance changes.
9. projector automatic focusing method according to claim 2, it is characterized in that, in described step S1, focus from described zero point, and when the sharpness of projected image is synchronously detected, the sharpness of described projected image can experience the process progressively improving, reach best, be progressively deteriorated, then record obtain described in most picture rich in detail time the most clear focusing parameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410809680.1A CN104570568B (en) | 2014-12-19 | 2014-12-19 | Automatic focusing method for projector |
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| CN201410809680.1A CN104570568B (en) | 2014-12-19 | 2014-12-19 | Automatic focusing method for projector |
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| CN104570568A true CN104570568A (en) | 2015-04-29 |
| CN104570568B CN104570568B (en) | 2017-02-22 |
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Cited By (14)
| 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 |
| CN106707674A (en) * | 2015-11-17 | 2017-05-24 | 深圳市绎立锐光科技开发有限公司 | Automatic focusing method of projection equipment and the projection equipment |
| WO2017190400A1 (en) * | 2016-05-03 | 2017-11-09 | 中兴通讯股份有限公司 | Projector processing method, device, and terminal |
| CN108398845A (en) * | 2018-02-02 | 2018-08-14 | 北京小米移动软件有限公司 | Projection device control method and projection device control device |
| WO2018214153A1 (en) * | 2017-05-26 | 2018-11-29 | 神画科技（深圳）有限公司 | Automated compensation system and method for heat-caused defocusing |
| WO2019037326A1 (en) * | 2017-08-21 | 2019-02-28 | 深圳光峰科技股份有限公司 | Automatic focusing method for projector and projector |
| CN109633860A (en) * | 2019-01-22 | 2019-04-16 | 成都市极米科技有限公司 | Automatically adjust method, lens position adjusting device and the projector of lens location |
| CN110519580A (en) * | 2019-10-11 | 2019-11-29 | 成都极米科技股份有限公司 | A kind of projector automatic focusing method, device, equipment and readable storage medium storing program for executing |
| CN110769230A (en) * | 2019-08-02 | 2020-02-07 | 成都极米科技股份有限公司 | Focusing method and device and projection equipment |
| CN111225196A (en) * | 2018-11-26 | 2020-06-02 | 微鲸科技有限公司 | Focusing test method and device |
| CN111358425A (en) * | 2020-03-17 | 2020-07-03 | 苏州微清医疗器械有限公司 | Automatic focusing method and fundus camera |
| CN112437282A (en) * | 2020-08-18 | 2021-03-02 | 深圳市安华光电技术有限公司 | Image definition adjusting method and device and DLP projector |
| CN112637485A (en) * | 2020-12-16 | 2021-04-09 | 普联技术有限公司 | Vision-assisted lens automatic focusing method, system, equipment and storage medium |
| CN114740681A (en) * | 2022-04-19 | 2022-07-12 | 深圳市和天创科技有限公司 | Intelligent distance measurement adjusting system of single-chip liquid crystal projector with rotary lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707674A (en) * | 2015-11-17 | 2017-05-24 | 深圳市绎立锐光科技开发有限公司 | Automatic focusing method of projection equipment and the projection equipment |
| CN106707674B (en) * | 2015-11-17 | 2021-02-26 | 深圳光峰科技股份有限公司 | Automatic focusing method of projection equipment and projection equipment |
| 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 |
| WO2017190400A1 (en) * | 2016-05-03 | 2017-11-09 | 中兴通讯股份有限公司 | Projector processing method, device, and terminal |
| WO2018214153A1 (en) * | 2017-05-26 | 2018-11-29 | 神画科技（深圳）有限公司 | Automated compensation system and method for heat-caused defocusing |
| CN109426060A (en) * | 2017-08-21 | 2019-03-05 | 深圳光峰科技股份有限公司 | Projector automatic focusing method and projector |
| WO2019037326A1 (en) * | 2017-08-21 | 2019-02-28 | 深圳光峰科技股份有限公司 | Automatic focusing method for projector and projector |
| CN108398845A (en) * | 2018-02-02 | 2018-08-14 | 北京小米移动软件有限公司 | Projection device control method and projection device control device |
| CN111225196A (en) * | 2018-11-26 | 2020-06-02 | 微鲸科技有限公司 | Focusing test method and device |
| CN109633860A (en) * | 2019-01-22 | 2019-04-16 | 成都市极米科技有限公司 | Automatically adjust method, lens position adjusting device and the projector of lens location |
| CN110769230A (en) * | 2019-08-02 | 2020-02-07 | 成都极米科技股份有限公司 | Focusing method and device and projection equipment |
| CN110519580B (en) * | 2019-10-11 | 2021-10-22 | 成都极米科技股份有限公司 | Automatic focusing method, device and equipment for projector and readable storage medium |
| CN110519580A (en) * | 2019-10-11 | 2019-11-29 | 成都极米科技股份有限公司 | A kind of projector automatic focusing method, device, equipment and readable storage medium storing program for executing |
| CN111358425A (en) * | 2020-03-17 | 2020-07-03 | 苏州微清医疗器械有限公司 | Automatic focusing method and fundus camera |
| CN112437282A (en) * | 2020-08-18 | 2021-03-02 | 深圳市安华光电技术有限公司 | Image definition adjusting method and device and DLP projector |
| CN112637485A (en) * | 2020-12-16 | 2021-04-09 | 普联技术有限公司 | Vision-assisted lens automatic focusing method, system, equipment and storage medium |
| CN114740681A (en) * | 2022-04-19 | 2022-07-12 | 深圳市和天创科技有限公司 | Intelligent distance measurement adjusting system of single-chip liquid crystal projector with rotary lens |
| CN114740681B (en) * | 2022-04-19 | 2023-10-03 | 深圳市和天创科技有限公司 | Intelligent ranging adjustment system of monolithic liquid crystal projector with rotary lens |
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