CN102354079A - Projection device and automatic focusing method - Google Patents
Projection device and automatic focusing method Download PDFInfo
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- CN102354079A CN102354079A CN2011102881096A CN201110288109A CN102354079A CN 102354079 A CN102354079 A CN 102354079A CN 2011102881096 A CN2011102881096 A CN 2011102881096A CN 201110288109 A CN201110288109 A CN 201110288109A CN 102354079 A CN102354079 A CN 102354079A
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Abstract
The invention discloses a projection device and an automatic focusing method, and belongs to the technical field of projection display. The projection device is designed for solving the problem that the focal distance of a projection lens group needs to be adjusted by a user manually in the prior art. The projection device comprises a processing unit, a projection unit, a projection lens group and a projection lens driving unit. The processing unit is respectively connected with the projection unit and the projection lens driving unit; the projection device further comprises an image acquiring unit which is connected with the processing unit; and at least three laser emitters are arranged around the image acquiring unit.
Description
Technical field
The present invention relates to the projection display technique field, relate in particular to a kind of projector equipment and automatic focusing method of automatic focusing.
Background technology
Give lessons in school, when the data of giving a lecture in the conference, in company, carry out is showed and is watched high-quality film at home, all can use projector equipment, the usable range of projector equipment is widened gradually.When using projector equipment,, then need regulate the focal length of projector equipment for making the image of clear display on projection and the curtain.
In the prior art; When the focal length of projector equipment is regulated; The manual modes of using are carried out more; The image projecting that is about to required broadcast to the curtain after; Through human eye the sharpness of the image on the curtain is judged; And according to focal length that judge to regulate projector equipment, and regulate the sharpness of image on the curtain with this.
In said process, need the user manually progressively to regulate the focal length of projector equipment, so that curtain is attend the optimal sharpness of image of institute's projection, complex operation.
Summary of the invention
Embodiments of the invention provide a kind of projector equipment and automatic focusing method of realizing focusing automatically.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of projector equipment comprises processing unit, projecting cell, projection lens group and projection lens driver element; Said processing unit is connected with the projection lens driver element with said projecting cell respectively; Said projector equipment also comprises image acquisition units, and this image acquisition units is connected with said processing unit; Around this image acquisition units, be provided with at least three generating lasers;
Said generating laser is used to launch light beam, and this light beam forms luminous point on the projecting plane;
Said image acquisition units is used to gather the image on the said projecting plane;
Said processing unit is used for according to said image, calculates the arithmetic mean of the figure length of side that said luminous point surrounds, and confirms the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side;
Said projection lens driver element is used for the pinpointed focus according to said projection lens group, and the focal length of said projection lens group is adjusted.
A kind of automatic focusing method comprises:
The emission light beam, this light beam forms luminous point on the projecting plane;
Image on the acquired projections face;
According to said image, calculate the arithmetic mean of the figure length of side that said luminous point surrounds, and confirm the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side;
According to the pinpointed focus of said projection lens group, the focal length of said projection lens group is adjusted.
A kind of projector equipment that the embodiment of the invention provides and automatic focusing method; The figure that the luminous point that on the projecting plane, forms through image acquisition units collection generating laser emitted light beams surrounds; And confirm that through processing unit pinpointed focus regulates the focal length of projection lens group automatically according to institute's images acquired; To realize regulating projector equipment is attend the image of institute's projection on the projecting plane sharpness; Needing to avoid the manual focus distance to adjust, thereby simplified the process of adjusting for the projector equipment focal length.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1 described projector equipment;
Fig. 2 is the synoptic diagram of each parameter in the embodiment of the invention 1 described projector equipment;
Fig. 3 is the process flow diagram of the embodiment of the invention 1 described automatic focusing method;
Fig. 4 is the process flow diagram of the embodiment of the invention 1 described automatic focusing method calculating optimum focal length;
Fig. 5 is first image on the captured projecting plane of the embodiment of the invention 1 described automatic focusing method image acquisition units;
Second image on the projecting plane when Fig. 6 is the focusing of the captured needs of the embodiment of the invention 1 described automatic focusing method image acquisition units;
Fig. 7 is the structural representation of the embodiment of the invention 2 described projector equipments;
Fig. 8 confirms the process flow diagram of pinpointed focus for the embodiment of the invention 2 described automatic focusing methods.
Embodiment
Below in conjunction with accompanying drawing a kind of projector equipment of the embodiment of the invention and automatic focusing method are described in detail.
Should be clear and definite, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment 1
A kind of projector equipment as shown in Figure 1, comprises processing unit, projecting cell, projection lens group and projection lens driver element; Said processing unit is connected with the projection lens driver element with said projecting cell respectively; Said projector equipment also comprises image acquisition units, and this image acquisition units is connected with said processing unit; Around this image acquisition units, be provided with at least three generating lasers;
Said generating laser is used to launch light beam, and this light beam forms luminous point on the projecting plane;
Said image acquisition units is used to gather the image on the said projecting plane;
Said processing unit is used for according to said image, calculates the arithmetic mean of the figure length of side that said luminous point surrounds, and confirms the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side;
Said projection lens driver element is used for the pinpointed focus according to said projection lens group, and the focal length of said projection lens group is adjusted.
Said image acquisition units can be camera.
Said projecting cell is used to carry the object of required formation projection, and this object can maybe can form the image-forming component of image for the picture of projection; This image-forming component imaging derives from the image of outside input projector equipment.
Said generating laser can be launched the high-energy light beam, and this light beam can be visible light or invisible light, and this light beam formed luminous point on the projecting plane can be gathered through image acquisition units.
Said projection lens driver element comprises drive motor; This motor is a stepper motor, can confirm the changing value of the projection lens group focal length in every one step of adjustment of stepper motor.
The said figure length of side comprises: as the standard length of side and the focusing length of side that is used for said projection lens group focal length is adjusted of standard of comparison.
Said image acquisition units comprises camera lens, and this camera lens and said projection lens group are in same plane.
Said at least three generating lasers are the regular polygon setting around image acquisition units, and the direction of this generating laser illuminating part is consistent with the optical axis direction of image acquisition units.
Said processing unit also comprises ratio determination module, image distance determination module and focal length determination module:
Said ratio determination module according to said image, obtains the arithmetic mean of the said standard length of side and the said focusing length of side, and confirms the ratio of the said focusing length of side and the said standard length of side;
Said image distance determination module; Be used for ratio according to relation and the said focusing length of side and the said standard length of side of the said standard length of side and said image acquisition units focal length; Calculate the object distance of said image acquisition units to said projecting plane, the object distance of said image acquisition units is identical with the image distance of said projection lens group;
Said focal length determination module is used for confirming the needed pinpointed focus of said projection lens group according to the focal length of said projection lens group and the inverse and the inverse that equals image distance of object distance.
Described projector equipment also comprises storer, and this storer is connected with said processing unit;
Said storer is used to store the arithmetic mean of the said figure length of side and the relation table of said image acquisition units object distance.
Said processing unit comprises length of side computing module, table lookup module and focal length determination module;
Said length of side computing module is used to calculate the arithmetic mean of the said focusing length of side;
Said table lookup module is used for the arithmetic mean according to the said focusing length of side, inquires about said relation table, confirms the image acquisition units object distance, and said image acquisition units object distance is identical with the image distance of projection lens group;
Said focal length determination module is used for confirming the needed pinpointed focus of this projection lens group according to the focal length of said projection lens group and the inverse and the inverse that equals image distance of object distance.
Said projection lens group is made up of at least two eyeglasses; This eyeglass can be one of convex lens and concavees lens or combination; This projection lens group is corresponding with projecting cell, and the image that projecting cell carried is amplified.
Said projection lens driver element through the distance between stepper motor adjustment eyeglass so that the focal length of projection lens group is adjusted.
The parameters relationship of said image acquisition units, as shown in Figure 2, said parameter comprises the image acquisition units focal distance f
S, image acquisition units focus-object distance x and image acquisition units object distance L; Said image acquisition units focal length is relevant with the characteristic of image acquisition units camera lens, so after selected one specific image acquisition units, the focal length of this image acquisition units is just definite; This image acquisition units focus-object distance is relevant to the distance on projecting plane with projector equipment with the image acquisition units object distance; And there is funtcional relationship in these three parameters: L=f
S+ x, and have enlargement factor β=f for perfect optical system
S/ x.
The parameter of said projection lens group comprises projection lens group image distance z, projection lens group object distance y and projection lens group focal distance f
tThere are relation to the projection lens group in picture that this projection lens group object distance is the projection in the projecting cell or image-forming component apart from these three parameters:
So pass through the image that image acquisition units is taken the projecting plane, and publish picture as the image acquisition units object distance of collecting unit to the projecting plane according to image calculation; This image acquisition units object distance is a projection lens group image distance, just can obtain the needed pinpointed focus of projection lens group.
Corresponding with above-mentioned a kind of projector equipment, the present invention also provides a kind of automatic focusing method, as shown in Figure 3, comprising:
Step 300, emission light beam, this light beam forms luminous point on the projecting plane
Before projector equipment is positioned over the projecting plane, start this projector equipment.Generating laser is launched light beam to the projecting plane; And projecting cell projects to needed picture on the projecting plane; For example around image acquisition units, four generating lasers are set, there are four in formed image on the projecting plane by the formed luminous point of generating laser on the projecting plane.
Image on step 301, the acquired projections face
Through the image on the image acquisition units acquired projections face, comprise generating laser formed luminous point on the projecting plane on this image, this luminous point forms quadrilateral on the projecting plane.
Step 302, according to said image, calculate the arithmetic mean of the figure length of side that said luminous point surrounds, and confirm the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side
When the image on the projecting plane is gathered; Need gather the formed figure length of side of luminous point on twice projecting plane at least; The said figure length of side comprises: as the standard length of side and the focusing length of side that is used for said projection lens group focal length is adjusted of standard of comparison.
For fixed image acquisition units, there are three parameters, i.e. image acquisition units focal distance f
S, image acquisition units focus-object distance x and image acquisition units object distance L; Said image acquisition units focal length is relevant with the characteristic of image acquisition units camera lens, so after selected one specific image acquisition units, the focal length of this image acquisition units is just definite; This image acquisition units focus-object distance is relevant to the distance on projecting plane with projector equipment with the image acquisition units object distance; There is funtcional relationship in these three parameters: L=f
S+ x and have enlargement factor β=f for perfect optical system
S/ x.
Image acquisition units sends to processing unit with the image of being gathered and handles, and confirms as shown in Figure 4, also to comprise the pinpointed focus of projection lens group according to the figure length of side that luminous point surrounded in this image:
Earlier projector equipment being positioned over primary importance, can confirming artificially that on this primary importance the focus-object distance of this locational image acquisition units is a definite value, is that example is described so that 10 times of image acquisition units focal lengths of image acquisition units focus-object distance to be set for example.Image acquisition units is gathered the image on projecting plane, and the image of being gathered is called first image.As shown in Figure 5, the image upper left corner is set to true origin (0,0), and the then corresponding coordinate of confirming generating laser formed luminous point on the projecting plane is respectively (x
1, y
1), (x
2, y
2), (x
3, y
3), (x
4, y
4); Can confirm this four figure length of sides that luminous point surrounded according to the coordinate of said four luminous points, this figure length of side is the standard length of side as standard of comparison, according to can the settle the standard arithmetic mean a of the length of side of this standard length of side
0, and can confirm enlargement factor β this moment
0=f
S/ x=0.1.
Again projector equipment is positioned over the second place, this second place be required when operate as normal the residing position of projector equipment; On the second place, projecting plane second image that image acquisition units is gathered, as shown in Figure 6, wherein generating laser on the projecting plane formed luminous point with respect to the coordinate of image origin position be (x '
1, y '
1), (x '
2, y '
2), (x '
3, y '
3), (x '
4, y '
4); Can confirm this four figure length of sides that luminous point surrounded according to the coordinate of said four luminous points, this figure length of side is to be used for the focusing length of side that said projection lens group focal length is adjusted, according to this focusing length of side can confirm to focus arithmetic mean a of the length of side
1
Confirm the ratio a of the said standard length of side and the said focusing length of side
0/ a
1
The ratio a of the said standard length of side and the said focusing length of side
0/ a
1, the pairing enlargement factor β of the said standard length of side
0=0.1.And according to funtcional relationship L=f
S+ x and β=f
S/ x can obtain funtcional relationship L=(1+ β) f of said image acquisition units object distance and enlargement factor
S/ β.
There is β for perfect optical system
0/ β
1=a
0/ a
1, because of a
0, a
1Gather according to image acquisition units, so can obtain β
1And then can obtain L
1The object distance of said image acquisition units is identical with the image distance z of said projection lens group.
There is funtcional relationship for the projection lens group
Wherein z is a projection lens group image distance, and y is the object distance of projection lens group, f
tFocal length for the projection lens group; Because of projection lens group image distance is identical with the object distance of image acquisition units, and in a projector equipment of confirming, the object distance of projection lens group is definite, just can obtain needed projection lens group focal distance f
t, this projection lens group focal distance f
tBe required pinpointed focus.
Step 304, according to the pinpointed focus of said projection lens group, the focal length of said projection lens group is adjusted
According to the pinpointed focus of being obtained, through the distance between eyeglass in the stepper motor adjustment projection lens group in the processing unit control projection lens driver element, focal length is adjusted to pinpointed focus with this, accomplish focusing for projector equipment.
Based on embodiment 1 described a kind of projector equipment and automatic focusing method, when focusing automatically,, can reduce the speed that projector equipment is focused automatically because of to IMAQ and to calculate the operand of pinpointed focus bigger.
For addressing the above problem, concrete, said projector equipment as shown in Figure 7, also comprises storer, and this storer is connected with processing unit;
Said storer is used to store the arithmetic mean of the said figure length of side and the relation table of said image acquisition units object distance.
Said processing unit comprises length of side computing module, table lookup module and focal length determination module;
Said length of side computing module is used to calculate the arithmetic mean of the said focusing length of side;
Said table lookup module is used for the arithmetic mean according to the said focusing length of side, inquires about said relation table, confirms the image acquisition units object distance, and said image acquisition units object distance is identical with the image distance of projection lens group;
Said focal length determination module is used for confirming the needed pinpointed focus of this projection lens group according to the focal length of said projection lens group and the inverse and the inverse that equals image distance of object distance.
Corresponding with above-mentioned a kind of projector equipment; The present invention also provides a kind of automatic focusing method; At said emission light beam, this light beam also comprised: store the arithmetic mean of the said figure length of side and the relation table of said image acquisition units object distance before forming luminous point on the projecting plane.
Before said projector equipment dispatches from the factory; The position of projector equipment can repeatedly be set; And solve the relation of the image length of side and image acquisition units object distance; The position of projector equipment for example is set; Make the image acquisition units focus-object distance be respectively 1 times of focal length, 2 times of focal lengths, 3 times of focal lengths ... 100 times of focal lengths, and calculate the arithmetic mean and the pairing image acquisition units object distance of the figure length of side that luminous point surrounded in the captured image of image acquisition units respectively; Form projector equipment when diverse location, the relation table of the arithmetic mean of the figure length of side and image acquisition units object distance.Said relation table is stored in the storage unit of projector equipment.
When the user uses projector equipment, said according to said image, calculate the arithmetic mean of the figure length of side that said luminous point surrounds, and confirm as shown in Figure 8, also to comprise the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side:
The arithmetic mean of step 800, the said focusing length of side of calculating
According to the image that image acquisition units is gathered, calculate the arithmetic mean of this figure length of side.
Step 801, according to the arithmetic mean of the said focusing length of side, inquire about said relation table, confirm the image acquisition units object distance, said image acquisition units object distance is identical with the image distance of projection lens group
Arithmetic mean according to the figure focusing length of side that said luminous point surrounded; Processing unit mates the arithmetic mean of the figure length of side of being stored in the arithmetic mean of the figure that the calculates focusing length of side and the storer; Confirm the most close value; And obtain pairing image acquisition units object distance, this object distance is identical with the image distance of projection lens group.
Step 802, according to the reciprocal of the focal length of said projection lens group and object distance with equal the inverse of image distance, confirm the needed pinpointed focus of this projection lens group
According to the projection lens group image distance, according to the function
projection image acquisition unit to determine the best focus group.
Said projection lens driver element is adjusted the focal length of projection lens group based on this pinpointed focus, accomplishes the automatic focusing of projector equipment.
Further; For the automatic focusing that makes projector equipment more accurate; In the arithmetic mean of the figure focusing length of side that said luminous point surrounded and the relation table of image acquisition units object distance; The position of corresponding each projector equipment; In positive and negative 30 degree in the image acquisition units optical axis left and right sides; The pairing image acquisition units focus-object distance of different angles is carried out record; And confirm when this angle; The value of the arithmetic mean of the said figure length of side and image acquisition units object distance; For example between positive and negative 30 degree, per 5 degree records once; The arithmetic mean of the said figure length of side and the relation table of image acquisition units object distance are stored in the storer, and this relation table is called the angle question blank.
At this moment, when using projector equipment in a position, processing unit calculates the arithmetic mean of the formed figure focusing of the above luminous point of the projecting plane length of side; Arithmetic mean according to this figure focusing length of side is inquired about, and is in the table between two values like this arithmetic mean, then can further mate according to this angle question blank, with the focal length of a definite projection lens group.
A kind of projector equipment that the embodiment of the invention provides and automatic focusing method; The figure that the luminous point that on the projecting plane, forms through image acquisition units collection generating laser emitted light beams surrounds; And confirm that through processing unit pinpointed focus regulates the focal length of projection lens group automatically according to institute's images acquired; To realize regulating projector equipment is attend the image of institute's projection on the projecting plane sharpness; Needing to avoid the manual focus distance to adjust, thereby simplified the process of adjusting for the projector equipment focal length.
The above; Only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by said protection domain with claim.
Claims (10)
1. a projector equipment comprises processing unit, projecting cell, projection lens group and projection lens driver element; Said processing unit is connected with the projection lens driver element with said projecting cell respectively, it is characterized in that, also comprises image acquisition units, and this image acquisition units is connected with said processing unit; Around this image acquisition units, be provided with at least three generating lasers;
Said generating laser is used to launch light beam, and this light beam forms luminous point on the projecting plane;
Said image acquisition units is used to gather the image on the said projecting plane;
Said processing unit is used for according to said image, calculates the arithmetic mean of the figure length of side that said luminous point surrounds, and confirms the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side;
Said projection lens driver element is used for the pinpointed focus according to said projection lens group, and the focal length of said projection lens group is adjusted.
2. projector equipment according to claim 1 is characterized in that, the said figure length of side comprises: as the standard length of side and the focusing length of side that is used for said projection lens group focal length is adjusted of standard of comparison.
3. projector equipment according to claim 2 is characterized in that, said processing unit also comprises ratio determination module, image distance determination module and focal length determination module:
Said ratio determination module according to said image, obtains the arithmetic mean of the said standard length of side and the said focusing length of side, and confirms the ratio of the said focusing length of side and the said standard length of side;
Said image distance determination module; Be used for ratio according to said image acquisition units focal length and the said focusing length of side and the said standard length of side; Calculate the object distance of said image acquisition units to said projecting plane, the object distance of said image acquisition units is identical with the image distance of said projection lens group;
Said focal length determination module is used for confirming the needed pinpointed focus of said projection lens group according to the focal length of said projection lens group and the inverse and the inverse that equals image distance of object distance.
4. projector equipment according to claim 2 is characterized in that, also comprises storer, and this storer is connected with said processing unit;
Said storer is used to store the arithmetic mean of the said figure length of side and the relation table of said image acquisition units object distance.
5. projector equipment according to claim 4 is characterized in that, said processing unit comprises length of side computing module, table lookup module and focal length determination module;
Said length of side computing module is used to calculate the arithmetic mean of the said focusing length of side;
Said table lookup module is used for the arithmetic mean according to the said focusing length of side, inquires about said relation table, confirms the image acquisition units object distance, and said image acquisition units object distance is identical with the image distance of projection lens group;
Said focal length determination module is used for confirming the needed pinpointed focus of this projection lens group according to the focal length of said projection lens group and the inverse and the inverse that equals image distance of object distance.
6. according to the described projector equipment of claim 1-5, it is characterized in that said image acquisition units comprises camera lens, this camera lens and said projection lens group are in same plane.
7. an automatic focusing method is characterized in that, comprising:
The emission light beam, this light beam forms luminous point on the projecting plane;
Image on the acquired projections face;
According to said image, calculate the arithmetic mean of the figure length of side that said luminous point surrounds, and confirm the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side;
According to the pinpointed focus of said projection lens group, the focal length of said projection lens group is adjusted.
8. automatic focusing method according to claim 7 is characterized in that, the said figure length of side comprises: as the standard length of side and the focusing length of side that is used for said projection lens group focal length is adjusted of standard of comparison.
9. automatic focusing method according to claim 8; It is characterized in that, said according to said image, calculate the arithmetic mean of the figure length of side that said luminous point surrounds; And confirm also to comprise the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side:
According to said image, obtain the arithmetic mean of the said standard length of side and the said focusing length of side, and confirm the ratio of the said focusing length of side and the said standard length of side;
According to the ratio of said image acquisition units focal length and the said focusing length of side and the said standard length of side, calculate the object distance of said image acquisition units to said projecting plane, the object distance of said image acquisition units is identical with the image distance of said projection lens group;
According to the focal length of said projection lens group and the inverse and the inverse that equals image distance of object distance, confirm the needed pinpointed focus of said projection lens group.
10. automatic focusing method according to claim 8 is characterized in that, at said emission light beam, this light beam also comprised before forming luminous point on the projecting plane:
Store the arithmetic mean of the said figure length of side and the relation table of said image acquisition units object distance;
Said according to said image, calculate the arithmetic mean of the figure length of side that said luminous point surrounds, and confirm also to comprise the pinpointed focus of said projection lens group according to the arithmetic mean of this figure length of side:
Calculate the arithmetic mean of the said focusing length of side;
According to the arithmetic mean of the said focusing length of side, inquire about said relation table, confirm the image acquisition units object distance, said image acquisition units object distance is identical with the image distance of projection lens group;
Based on the focal length of said projection lens group and the inverse and the inverse that equals image distance of object distance, confirm the needed pinpointed focus of this projection lens group.
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| CN103595919A (en) * | 2013-11-15 | 2014-02-19 | 深圳市中兴移动通信有限公司 | Manual focusing method and shooting device |
| CN104184977A (en) * | 2013-05-27 | 2014-12-03 | 联想(北京)有限公司 | Projection method and electronic equipment |
| CN104796677A (en) * | 2015-04-09 | 2015-07-22 | 青岛海信电器股份有限公司 | Focal length adjusting method and focal length adjusting device |
| 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 |
| CN105573041A (en) * | 2014-10-09 | 2016-05-11 | 中兴通讯股份有限公司 | Method and device for realizing automatic focusing of projector, and projector |
| CN105786337A (en) * | 2014-12-22 | 2016-07-20 | 联想(北京)有限公司 | Information processing method and electronic device |
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| CN108024101A (en) * | 2016-10-28 | 2018-05-11 | 中强光电股份有限公司 | Projector and its focalization method |
| CN109040722A (en) * | 2018-07-23 | 2018-12-18 | 四川长虹电器股份有限公司 | The system and its implementation of mobile phone realization ultra short focal projector auto-focusing |
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