CN101470246B - Automatic focusing system and method for projector - Google Patents
Automatic focusing system and method for projector Download PDFInfo
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- CN101470246B CN101470246B CN2007102034962A CN200710203496A CN101470246B CN 101470246 B CN101470246 B CN 101470246B CN 2007102034962 A CN2007102034962 A CN 2007102034962A CN 200710203496 A CN200710203496 A CN 200710203496A CN 101470246 B CN101470246 B CN 101470246B
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Abstract
The invention provides a projector automatic focusing system and a method thereof. The projector automatic focusing system includes an area selector module, a focal length setting module, a resolution calculation module, a contrast module and a control module, wherein the area selector module is used for selecting at least one analysis area on a projection face, the focal length setting module is used for setting a plurality of focal lengths within a focusing range of a lens, the resolution calculation module is used for computing resolution of the lens respectively at the end of each focal length within the focusing range, the contrast module is used for comparing the resolutions obtained by calculation to obtain the focal length of the end corresponding to the maximum resolution, the selector module is further used for selecting a plurality of sites within the obtained focal length, the resolution calculation module is further used for comparing the resolutions at the selected sites of the lens to obtain a site position corresponding to the maximum resolution, and the control module drives the lens to the position of the obtained site through a control motor. With the projector automatic focusing system and the method thereof, the focusing time can be saved and the focusing accuracy can be increased.
Description
Technical field
The present invention relates to a kind of projector autofocus system and method.
Background technology
Usually open after the projector, the step that the demonstrator need carry out is exactly to adjust the focal length and the position of projector, guarantees the normal of projection display picture, and for the business users of frequent conversion projector environment for use, these adjustment processes are loaded down with trivial details relatively.
And the distance of projector and projection plane can not detect in projectors such as existing projector, and focuses automatically to guarantee that projection display picture is clear.When projector's putting position and projection plane have certain angle tilt, the picture of projection has just produced distortion, and for guaranteeing the normal demonstration of picture, the user need spend the plenty of time that picture is regulated, and has caused reducing the efficient of projection demonstration.
Summary of the invention
In view of above content, preferred embodiment of the present invention provides a kind of projector autofocus system, the residing position of camera lens when on the projecting plane, selecting the resolution of analyzed area and drawing maximum resolution by calculating the user, and control motor by control chip camera lens is pushed into above-mentioned position to reach automatic focusing.
A kind of projector autofocus system, this projector's autofocus system runs in the projector, and this projector comprises: a control chip and the motor that the promotion camera lens stretches, described camera lens projection goes out a projecting plane, and described system comprises:
Module is selected in the zone, is used for selecting on the projecting plane at least one analyzed area;
Burnt section is provided with module, is used for being provided with in the zooming range of camera lens a plurality of burnt sections;
The resolution computing module, camera lens is to the resolution of above-mentioned analyzed area when being used to calculate camera lens and being in the zooming range each burnt section end points respectively; And
Comparing module, be used to compare aforementioned calculation obtain camera lens to the resolution of described analyzed area with the burnt section in the end points place that obtains maximum resolution correspondence;
The reconnaissance module is used for evenly choosing a plurality of points in the burnt section of being obtained;
Described resolution computing module, camera lens is to the resolution of described analyzed area when also being used to calculate camera lens and being in each selected point; And
Described comparing module, also be used to compare camera lens be in each selected point place to the resolution of analyzed area to obtain the position of maximum resolution corresponding point; And
Described control chip promotes the position of camera lens to described acquisition point by the control motor.
In view of above content, also a kind of projector of preferred embodiment of the present invention method of focusing automatically, this projector comprises a control chip, and this control chip promotes camera lens by the control motor, and the method comprising the steps of:
After projector's start powered on, projection went out a projecting plane on a screen;
On the projecting plane, select at least one analyzed area;
A plurality of burnt sections are set in the zooming range of camera lens;
Camera lens is to the resolution of above-mentioned analyzed area when calculating camera lens and being in the zooming range each burnt section end points respectively; And
The resolution of the analyzed area that obtains of comparison aforementioned calculation to be obtaining maximum resolution, and obtains the burnt section in end points place of this maximum resolution correspondence;
In the burnt section of being obtained, evenly choose a plurality of points;
Camera lens was to the resolution of described analyzed area when the calculating camera lens was in each selected point; And
The comparison camera lens be in each selected point place to the resolution of analyzed area obtaining a maximum resolution, and obtain the position of the corresponding selected point of this maximum resolution; And
Control chip promotes the position of camera lens to described acquisition point by the control motor.
Compared to prior art, described projector autofocus system and method, the image analytic degree of the analyzed area that the user selects when being in each position by calculating camera lens, and by control chip control motor camera lens is pushed into analyzed area is had maximum resolution position to reach automatic focusing, need not the user and manually focus, thereby save the focusing time greatly and improve the focusing accuracy rate.
Description of drawings
Fig. 1 is the hardware structure figure of projector of the present invention autofocus system.
Fig. 2 is the functional block diagram of projector of the present invention autofocus system.
Fig. 3 is focus the automatically process flow diagram of method preferred embodiment of projector of the present invention.
Fig. 4 is the projecting plane synoptic diagram that obtains on screen of the present invention.
Embodiment
Consulting shown in Figure 1ly, is the hardware structure figure of projector of the present invention autofocus system preferred embodiment.Projector's autofocus system 12 runs in the machine shadow machine 1.This projector 1 comprises a control chip 10, motor 14, a storer 16 and a camera lens 18.Described storer 16 can be a flash memory (FLASH), is used to store the picture that need carry out projection.Thereby described control chip 10 stretches camera lens 18 by control motor 14 and adjusts focal length.Described projector autofocus system 12 is selected one or more analyzed areas by the projecting plane 2 (as shown in Figure 4) of camera lens 18 on screen, as A, B, C, D and O analyzed area, a plurality of burnt sections are set in the zooming range of camera lens 18, calculate camera lens 18 in zooming range each burnt section end points place to the resolution of above-mentioned analyzed area, analyses and comparison are to obtain the burnt section in the corresponding end points of maximum resolution place, on the burnt section of above-mentioned maximum resolution correspondence, select a plurality of points uniformly, when calculating camera lens 18 and being in each selected element respectively to the resolution of analyzed area, and the position of from aforementioned calculation gained resolution, selecting a maximum resolution and obtaining these maximum resolution corresponding point.Final control chip 10 is pushed into camera lens 18 by motor 14 position of above-mentioned acquisition point to reach the focusing purpose.The area of above-mentioned analyzed area A, B, C, D and O can be selected according to actual conditions, can be the zone of one 50 pixel * 50 pixel sizes.Above-mentioned each burnt section can be set to 5mm or other length, and reconnaissance can be chosen a point every 1mm on burnt section.
Consulting shown in Figure 2ly, is the functional block diagram of projector of the present invention autofocus system.This projector's autofocus system 12 comprises that zone selection module 120, burnt section are provided with module 121, resolution computing module 122, reconnaissance module 123 and comparing module 124.
Described zone selects module 120 to be used for selecting one or more analyzed areas on projecting plane 2, and described analyzed area can be distributed in arbitrary position on the opposite, projecting plane, as the analyzed area A among Fig. 4, B, C, D and O.In the present embodiment, analyzed area O is positioned at the center on projecting plane 2, and all the other analyzed area A, B, C, D lay respectively at four angles on projecting plane 2.Below for convenience of description, be example to select an analyzed area O.
Burnt section is provided with module 121 and is used for being provided with a plurality of burnt sections in zooming range.In the present embodiment, described burnt section is divided and can be decided according to actual conditions, is a burnt section as every 5mm.
The resolution of 18 couples of selected analyzed area O of camera lens when resolution computing module 122 is used to calculate camera lens 18 and is in the zooming range each burnt section end points.Be a burnt section, choose the analyzed area O that area is 50*50pixel with every 5mm below, be in the resolution of each burnt section end points place respectively analyzed area O thereby calculate camera lens 18.As zooming range being divided into a plurality of burnt sections [0,5], [5,10], [10,15], [15,20], [20,25] etc.; The corresponding endpoint location of each burnt section is respectively initial point 0,5mm, 10mm, 15mm, 20mm and 25mm.When camera lens 18 was in initial point 0, its resolution was 0.0745; When being in 5mm, its resolution is 0.152; When being in 10mm, its resolution is 0.367; When being in 15mm, its resolution is 0.379; When being in the 20mm place, its resolution is 0.352; When being in 25mm, its resolution is 0.149.
The above-mentioned resolution computing module 122 of comparing module 124 comparison calculates the analyzed area resolution that obtains when camera lenses 18 lay respectively at each burnt section end points place obtaining maximum resolution, and obtains the burnt section in end points place of this maximum resolution correspondence.Through above-mentioned comparison, when camera lens 18 was in 10mm, its resolution was 0.367; When being in 15mm, its resolution is 0.379; When being in the 20mm place, its resolution is 0.352; The maximum resolution of analyzed area O is 0.379 as can be known, and its corresponding end points is 15mm, and the burnt section in this end points place is 10mm～15mm and 15mm～20mm.
Reconnaissance module 123 is used for evenly choosing a plurality of points in the burnt section of being obtained, for example: in burnt section 10mm～15mm and 15mm～20mm, choose a plurality of points uniformly, as every 1mm in burnt section 10mm～15mm and the even selected point of 15mm～20mm, optionally get 10 points.
Described resolution computing module 122 is used to calculate camera lens 18 and is in the resolution of above-mentioned each selected point place to selected analyzed area.
The above-mentioned camera lens 18 of described comparing module 122 comparisons be in above-mentioned each selected point place camera lens to the analyzed area resolution obtaining a maximum resolution, and obtain the position of the pairing selected point of this maximum resolution.For example, draw the resolution maximum at 18mm place through comparison.
Fig. 3 is focus the automatically workflow diagram of method of projector of the present invention.Step S301, the user powers on projector's 1 start.
Step S302, the picture that camera lens 18 is stored storer 16 is projected on the screen and obtains projecting plane 2.
Step S303, zone selection module 120 is the one or more analyzed areas of 2 selections on the projecting plane, as analyzed area A, B, C, D and O.In the present embodiment, analyzed area O is positioned at the center on projecting plane 2, and analyzed area A, B, C and D lay respectively at four angles on the projecting plane 2.For convenience of description, existing is example to select analyzed area O.
Step S304, burnt section is provided with module 121 a plurality of burnt sections is set in the camera lens zooming range.In the present embodiment, described burnt section is divided and can be decided according to actual conditions, is a burnt section as 5mm.
Step S305 calculates camera lens 18 and is in the resolution of interior each the burnt section end points place of zooming range to selected analyzed area O.Be a burnt section, choose the analyzed area O that area is 50*50pixel with every 5mm below, be in the resolution of each burnt section end points place respectively analyzed area O thereby calculate camera lens 18.As zooming range being divided into a plurality of burnt sections [0,5], [5,10], [10,15], [15,20], [20,25] etc.; The corresponding endpoint location of each burnt section is respectively initial point 0,5mm, 10mm, 15mm, 20mm and 25mm.When camera lens 18 was in initial point 0, its resolution was 0.0745; When being in 5mm, its resolution is 0.152; When being in 10mm, its resolution is 0.367; When being in 15mm, its resolution is 0.379; When being in the 20mm place, its resolution is 0.352; When being in 25mm, its resolution is 0.149.
In step S306, the above-mentioned resolution computing module 122 of comparing module 124 comparison calculates the analyzed area resolution that obtains when camera lenses 18 lay respectively at each burnt section end points place obtaining maximum resolution, and obtains the burnt section in the corresponding end points of this maximum resolution place.Through above-mentioned comparison, when camera lens 18 was in 10mm, its resolution was 0.367; When being in 15mm, its resolution is 0.379; When being in the 20mm place, its resolution is 0.352; The maximum resolution of analyzed area O is 0.379 as can be known, and its corresponding end points is 15mm, and the burnt section in this end points place is 10mm～15mm and 15mm～20mm.
Among the step S307, select module 123 in the burnt section of being obtained, evenly to choose a plurality of points, for example: in burnt section 10mm～15mm and 15mm～20mm, choose a plurality of points uniformly, as every 1mm in burnt section 10mm～15mm and the even selected point of 15mm～20mm, optionally get 10 points.
Step S308, resolution computing module 122 are used to calculate camera lens 18 and are in the resolution of above-mentioned each selected point place to selected analyzed area.
In step S309, the above-mentioned camera lens 18 of described comparing module 122 comparisons be in above-mentioned each selected point place to the analyzed area resolution obtaining a maximum resolution, and obtain the position of the pairing selected point of this maximum resolution.For example, draw the resolution maximum at 18mm place through comparison.
In step S309, control chip 10 promotes the position of camera lens 18 to above-mentioned institute acquisition point by control motor 14, and final camera lens 18 is in best focusing position.
The synoptic diagram on the projecting plane 2 that Fig. 4 obtains on screen for camera lens 18 of the present invention.The user can choose analyzed area A, B, C, D and O arbitrarily on projecting plane 2.The central point of analyzed area O overlaps with the center position on opposite, projecting plane 2.The central point of arbitrary analyzed area is 0.3～0.5 of a catercorner length to projecting plane 2 central points distance among analyzed area A, B, C and the D.
Claims (10)
1. projector's autofocus system, this projector's autofocus system runs in the projector, and this projector comprises: a control chip and the motor that the promotion camera lens stretches, and described camera lens projection goes out a projecting plane, it is characterized in that described system comprises:
Module is selected in the zone, is used for selecting on the projecting plane at least one analyzed area;
Burnt section is provided with module, is used for being provided with in the zooming range of camera lens a plurality of burnt sections;
The resolution computing module, camera lens is to the resolution of above-mentioned analyzed area when being used to calculate camera lens and being in the zooming range each burnt section end points respectively; And
Comparing module, be used to compare camera lens that aforementioned calculation obtains to the resolution of analyzed area obtaining maximum resolution, and obtain the burnt section in the corresponding end points of this maximum resolution place;
The reconnaissance module is used for evenly choosing a plurality of points in the burnt section of being obtained;
Described resolution computing module, camera lens is to the resolution of described analyzed area when also being used to calculate camera lens and being in each selected point; And
Described comparing module, also be used to compare camera lens be in each selected point place camera lens to the resolution of analyzed area obtaining a maximum resolution, and obtain the position of the corresponding selected point of this maximum resolution; And
Described control chip promotes the position of camera lens to described acquisition point by the control motor.
2. projector as claimed in claim 1 autofocus system is characterized in that described analyzed area is arbitrary position on the projecting plane.
3. projector as claimed in claim 1 autofocus system is characterized in that, the area of described analyzed area is 50 pixels * 50 pixels.
4. projector as claimed in claim 1 autofocus system is characterized in that, described burnt segment length is set to 5mm.
5. projector as claimed in claim 1 autofocus system is characterized in that, described reconnaissance module every 1mm in the burnt section of obtaining chooses a point.
6. projector method of focusing automatically, described projector comprises a control chip, and this control chip promotes camera lens by the control motor, and the method comprising the steps of:
After projector's start powered on, projection went out a projecting plane on a screen;
On the projecting plane, select at least one analyzed area;
A plurality of burnt sections are set in the zooming range of camera lens;
Calculate when camera lens is in section end points of each Jiao zooming range in respectively camera lens to the resolution of described analyzed area; And
The resolution of the analyzed area that obtains of comparison aforementioned calculation to be obtaining maximum resolution, and obtains the burnt section in end points place of this maximum resolution correspondence;
In the burnt section of being obtained, evenly choose a plurality of points;
Calculate when camera lens is in each selected point camera lens to the resolution of described analyzed area; And
The comparison camera lens be in each selected point place to the resolution of analyzed area obtaining a maximum resolution, and obtain the position of these maximum resolution corresponding point; And
Control chip promotes the position of camera lens to described acquisition point by the control motor.
7. the projector as claimed in claim 6 method of focusing automatically is characterized in that described analyzed area is arbitrary position on the projecting plane.
8. the projector as claimed in claim 6 method of focusing automatically is characterized in that the area of described analyzed area is 50 pixels * 50 pixels.
9. the projector as claimed in claim 6 method of focusing automatically is characterized in that described burnt segment length is set to 5mm.
10. the projector as claimed in claim 6 method of focusing automatically is characterized in that described reconnaissance is to choose a point every 1mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102034962A CN101470246B (en) | 2007-12-27 | 2007-12-27 | Automatic focusing system and method for projector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007102034962A CN101470246B (en) | 2007-12-27 | 2007-12-27 | Automatic focusing system and method for projector |
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| CN101470246A CN101470246A (en) | 2009-07-01 |
| CN101470246B true CN101470246B (en) | 2010-12-01 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193164A (en) * | 2010-03-08 | 2011-09-21 | 华晶科技股份有限公司 | Focusing method and camera |
| CN103105660A (en) * | 2011-11-09 | 2013-05-15 | 华晶科技股份有限公司 | Lens actuating device and lens actuating method thereof |
| CN103067659A (en) * | 2012-12-26 | 2013-04-24 | 四川九洲电器集团有限责任公司 | Video analysis auxiliary hand-operated focusing method |
| CN104469169A (en) * | 2014-12-29 | 2015-03-25 | 信利光电股份有限公司 | Phase ranging camera shooting module and automatic focusing method thereof |
| CN104536249B (en) * | 2015-01-16 | 2016-08-24 | 努比亚技术有限公司 | The method and apparatus of regulation projector focal length |
| CN105208308B (en) * | 2015-09-25 | 2018-09-04 | 广景视睿科技（深圳）有限公司 | A kind of method and system for the best projection focus obtaining projecting apparatus |
| CN105301884A (en) * | 2015-11-13 | 2016-02-03 | 神画科技（深圳）有限公司 | Method and system for automatic focusing on multi-point reference image recognition |
| WO2017079964A1 (en) * | 2015-11-13 | 2017-05-18 | 神画科技（深圳）有限公司 | Method and system for automatic focusing on multi-point reference image recognition |
| 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 |
| CN106488121A (en) * | 2016-09-29 | 2017-03-08 | 西安中科晶像光电科技有限公司 | A kind of method and system of the automatic focusing based on pattern match |
| CN111064939A (en) | 2018-10-16 | 2020-04-24 | 中强光电股份有限公司 | Projection system and trapezoidal correction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1519637A (en) * | 2003-01-21 | 2004-08-11 | 光宝科技股份有限公司 | Automatic focusing method ofr projector and the projector using the method |
| CN1713068A (en) * | 2004-06-23 | 2005-12-28 | 精工爱普生株式会社 | Automatic focus adjustment for projector |
-
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- 2007-12-27 CN CN2007102034962A patent/CN101470246B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1519637A (en) * | 2003-01-21 | 2004-08-11 | 光宝科技股份有限公司 | Automatic focusing method ofr projector and the projector using the method |
| CN1713068A (en) * | 2004-06-23 | 2005-12-28 | 精工爱普生株式会社 | Automatic focus adjustment for projector |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2004-205684A 2004.07.22 |
| JP特开2005-165140A 2005.06.23 |
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