CN104469168A - Shooting module and automatic focusing method thereof - Google Patents
Shooting module and automatic focusing method thereof Download PDFInfo
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- CN104469168A CN104469168A CN201410833865.6A CN201410833865A CN104469168A CN 104469168 A CN104469168 A CN 104469168A CN 201410833865 A CN201410833865 A CN 201410833865A CN 104469168 A CN104469168 A CN 104469168A
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Abstract
The invention provides a shooting module and an automatic focusing method thereof. The shooting module comprises a motor and a camera embedded in the motor, and further comprises a ranging module, a control module and a drive module. The ranging module comprises a transmitting unit, a receiving unit and a processing unit, the transmitting unit is used for transmitting a ray to an object to be shot, the receiving unit is used for receiving the ray reflected by the object to be shot, and the processing unit is used for calculating the object distance between the shooting module and the object to be shot according to the time when the ray is transmitted and received and sending the measured object distance to the drive module. The control module is used for receiving the measured object distance, determining a corresponding drive instruction according to the corresponding relation between the object distance and a motor drive instruction, and sending the corresponding control instruction to the drive module. The drive module is used for outputting the drive instruction to the motor after receiving the control instruction, the motor drives the camera to the corresponding focusing position. According to the camera module and the focusing method, the focusing time is short, and the focusing speed is high.
Description
Technical field
The present invention relates to electronic technology field, more particularly, relate to a kind of camera module and Atomatic focusing method thereof.
Background technology
What existing camera module adopted mostly is contrast formula focusing mode.So-called contrast formula focusing searches best focal point based on camera lens picture difference of imaging on diverse location, its focus process is: camera lens is driven by a motor and advances towards certain direction, when on lens moving to a certain position, the data analysis in certain region of present image is calculated, obtain the value of an energy Relative quantification definition, record the position of camera lens simultaneously, camera lens obtains one group of numerical value after being continued mobile multistage distance, find the lens location that the maximum of these group data is corresponding, drive camera lens to get back to this position, thus finally realize auto-focusing.
That is, this focusing mode is before most high-contrast being detected, and need the position of constantly adjustment camera lens, therefore, focusing time is longer, and focusing speed is slower.
Summary of the invention
In view of this, the invention provides a kind of camera module and Atomatic focusing method thereof, adopt the focus camera module of mode auto-focusing of contrast formula to focus slow-footed problem to solve in prior art.
For achieving the above object, the invention provides following technical scheme:
A kind of camera module, comprises motor and is embedded in the camera lens in described motor, also comprise:
Range finder module, comprise transmitter unit, receiving element and processing unit, described transmitter unit is used for emission of light to object to be shot, described receiving element is for receiving the light be reflected back by described object to be shot, described processing unit is used for according to emission of light and receives the Time Calculation camera module of light and the object distance of object to be shot, and the object distance of described measurement is sent to driver module;
Control module, for receiving the object distance of described measurement, determines the driving instruction corresponding with the object distance of described measurement according to object distance with the corresponding relation of motor driving instruction, and the control command of correspondence is sent to driver module;
Driver module, for after receiving described control command, exports described driving instruction to described motor, makes lens moving described in described motor driving to corresponding focusing position, realize auto-focusing.
Preferably, also comprise:
Be positioned at the sensitive chip be connected bottom described camera lens and with described control module, for after lens moving to focusing position, induction light photographic images.
Preferably, described control module also for the image of analyzing and processing shooting, and produces adjustment instruction according to the mass parameter of described image, and described adjustment instruction is sent to driver module;
Described driver module is also for lens moving described in motor driving according to described adjustment order-driven, and the distance of described lens moving after adjustment is fed back to described control module, to make the corresponding relation of object distance and motor driving instruction described in described control module correction.
Preferably, the light that described transmitter unit is launched is laser or infrared light.
Preferably, the corresponding relation of described object distance and motor driving instruction sets up according to the corresponding relation of the corresponding relation of object distance and camera lens distance to be moved and camera lens distance to be moved and motor driving instruction.
Preferably, the corresponding relation of described object distance and camera lens distance to be moved obtains according to focal length formula.
Preferably, the distance that described camera lens is to be moved and the corresponding relation of motor driving instruction are that the slope calculated according to the driving instruction of the long shot of camera module distance to be moved and measurement and close up shots distance to be moved and driving instruction obtains.
An Atomatic focusing method for camera module, comprising:
Measure the object distance of camera module and object to be shot;
According to the corresponding relation of object distance and motor driving instruction, determine the driving instruction corresponding with the object distance of described measurement;
Export described driving instruction to motor, make described motor driving lens moving to corresponding focusing position, realize auto-focusing.
Preferably, also comprise:
Photographic images after described lens moving to focusing position, and the position adjusting described camera lens according to the mass parameter of described image;
The corresponding relation of object distance and motor driving instruction according to the distance correction of adjustment rear lens movement.
Compared with prior art, technical scheme provided by the present invention has the following advantages:
Camera module provided by the present invention and Atomatic focusing method thereof, the distance that namely distance due to motor driving lens moving moves to focusing position is controlled by driving instruction, and driving instruction is determined by the corresponding relation of the object distance measured and object distance and motor driving instruction, therefore, camera module provided by the invention and Atomatic focusing method thereof, without the need to realizing auto-focusing by the position of repeatedly analysis image and moving lens repeatedly, focusing time is shorter, speed.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structural representation of the camera module that Fig. 1 provides for one embodiment of the present of invention;
Linear relationship curve chart between the distance S that the camera lens that Fig. 2 provides for one embodiment of the present of invention is to be moved and motor driving instruction C;
The flow chart of the Atomatic focusing method of the camera module that Fig. 3 provides for an alternative embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
An embodiment provides a kind of camera module, comprise motor and be embedded in the camera lens in described motor, as shown in Figure 1, the camera module that the present embodiment provides also comprises range finder module 10, control module 20 and driver module 30.
Range finder module 10, comprise transmitter unit, receiving element and processing unit, described transmitter unit is used for emission of light to object to be shot, described receiving element is for receiving the light be reflected back by described object to be shot, described processing unit is used for according to emission of light and receives the Time Calculation camera module of light and the object distance of object to be shot, and the object distance of described measurement is sent to driver module 20, wherein, the light that range finder module 10 transmits and receives is laser or infrared light etc., is preferably laser;
Control module 20 is processor, for receiving the object distance of described measurement, determines the driving instruction corresponding with the object distance of described measurement according to object distance with the corresponding relation of motor driving instruction, and the control command of correspondence is sent to driver module 30; Driver module 30 is driving chip, for after receiving described control command, exports described driving instruction to described motor, makes lens moving described in described motor driving to corresponding focusing position, realize auto-focusing.
In the present embodiment, the corresponding relation of object distance and motor driving instruction sets up according to the corresponding relation of the corresponding relation of object distance and camera lens distance to be moved and camera lens distance to be moved and motor driving instruction.
Wherein, the corresponding relation of described object distance and camera lens distance to be moved obtains according to focal length formula.After measurement obtains object distance, object distance substituted in focal length formula 1/F=1/H+1/V and calculate image distance, wherein, F is the focal length of camera module, and H is image distance, and V is object distance.Due to the difference that distance that camera lens is to be moved is image distance and focal length, and the focal length of camera module is fixing and known, therefore, can obtain the corresponding relation of object distance and camera lens distance to be moved according to focal length formula.
The corresponding relation of the distance that camera lens is to be moved and motor driving instruction obtains according to the driving instruction of the long shot of camera module distance to be moved and measurement and close up shots distance to be moved and driving instruction.
Because the distant view object distance of camera module is set as being positioned at unlimited distance, therefore, according to focal length formula, the image distance of distant view equals focal length, when namely taking distant view image, long shot distance S1 to be moved is zero, obtains driving instruction C1 when taking distant view image by actual photographed distant view image simultaneously.And the general 10cm of close shot object distance of camera module, therefore, after going out image distance according to focal length formulae discovery, close up shots distance S2 to be moved can be gone out according to the mathematic interpolation of image distance and focal length, obtain driving instruction C2 when taking close shot image by actual photographed close shot image simultaneously.
Draw the linearity curve between camera lens distance S to be moved and motor driving instruction C according to (S1, C1) and (S2, C2), as shown in Figure 2, and calculate slope of a curve K, K=(S1-S2)/(C1-C2).The corresponding relation of camera lens distance to be moved and motor driving instruction can be obtained according to above-mentioned linearity curve.
Based on this, the corresponding relation of the corresponding relation of the distance to be moved according to camera lens and motor driving instruction and object distance and camera lens distance to be moved can obtain the corresponding relation of object distance and motor driving instruction, thus can after range finder module 10 records object distance, corresponding driving instruction can be determined with the corresponding relation of motor driving instruction according to object distance, thus CD-ROM drive motor drives described lens moving to corresponding focusing position, realizes auto-focusing.
In addition, the camera module in the present embodiment also comprises: be positioned at the sensitive chip be connected bottom described camera lens and with described control module 20, for after lens moving to focusing position, and induction light photographic images.After motor driving lens moving to corresponding focusing position, sensitive chip photographic images, the image of control module analyzing and processing shooting, and produce adjustment instruction according to the mass parameter of described image, and described adjustment instruction is sent to driver module; Driver module is lens moving described in motor driving according to described adjustment order-driven, and the distance of described lens moving after adjustment is fed back to described control module, to make the corresponding relation of object distance and motor driving instruction described in described control module correction.
The camera module that the present embodiment provides, the distance that namely distance due to motor driving lens moving moves to focusing position is controlled by driving instruction, and driving instruction is determined by the corresponding relation of the object distance measured and object distance and motor driving instruction, therefore, the camera module that the present embodiment provides is without the need to realizing auto-focusing by the position of repeatedly analysis image and moving lens repeatedly, focusing time is shorter, speed.
An alternative embodiment of the invention provides a kind of Atomatic focusing method of camera module, and its flow chart as shown in Figure 3, comprising:
S301: the object distance measuring camera module and object to be shot;
In the present embodiment, by the transmission measurement camera module of light and the object distance of object to be shot.Emission of light is to object to be shot, and receive the light be reflected back by described object to be shot, according to emission of light and the Time Calculation camera module of light and the object distance of object to be shot can be received, wherein, the light of transmitting and receiving is laser or infrared light etc., is preferably laser.
S302: according to the corresponding relation of object distance and motor driving instruction, determine the driving instruction corresponding with the object distance of described measurement;
Wherein, the corresponding relation of object distance and motor driving instruction sets up according to the corresponding relation of the corresponding relation of object distance and camera lens distance to be moved and camera lens distance to be moved and motor driving instruction.
After measurement obtains object distance, go out image distance according to focal length formulae discovery, and the difference of image distance and focal length is camera lens distance to be moved; Further, the driving instruction measured according to the long shot of camera module Distance geometry to be moved and close up shots Distance geometry driving instruction to be moved, after obtaining the corresponding relation of camera lens distance to be moved and motor driving instruction, the driving instruction corresponding with the object distance measured can be obtained.
S303: export described driving instruction to motor, makes described motor driving lens moving to corresponding focusing position, realizes auto-focusing.
After realizing auto-focusing, in order to avoid the existence of error, also need to detect focusing result, the Atomatic focusing method namely in the present embodiment also comprises: photographic images after described lens moving to focusing position, and the position adjusting described camera lens according to the mass parameter of described image; The corresponding relation of object distance and motor driving instruction according to the distance correction of adjustment rear lens movement.
The camera module Atomatic focusing method that the present embodiment provides, the distance that namely distance due to motor driving lens moving moves to focusing position is controlled by driving instruction, and driving instruction is determined by the corresponding relation of the object distance measured and object distance and motor driving instruction, therefore, camera module Atomatic focusing method provided by the invention, without the need to realizing auto-focusing by the position of repeatedly analysis image and moving lens repeatedly, focusing time is shorter, speed.
Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (9)
1. a camera module, comprises motor and is embedded in the camera lens in described motor, it is characterized in that, also comprise:
Range finder module, comprise transmitter unit, receiving element and processing unit, described transmitter unit is used for emission of light to object to be shot, described receiving element is for receiving the light be reflected back by described object to be shot, described processing unit is used for according to emission of light and receives the Time Calculation camera module of light and the object distance of object to be shot, and the object distance of described measurement is sent to driver module;
Control module, for receiving the object distance of described measurement, determines the driving instruction corresponding with the object distance of described measurement according to object distance with the corresponding relation of motor driving instruction, and the control command of correspondence is sent to driver module;
Driver module, for after receiving described control command, exports described driving instruction to described motor, makes lens moving described in described motor driving to corresponding focusing position, realize auto-focusing.
2. camera module according to claim 1, is characterized in that, also comprises:
Be positioned at the sensitive chip be connected bottom described camera lens and with described control module, for after lens moving to focusing position, induction light photographic images.
3. camera module according to claim 2, is characterized in that, described control module also for the image of analyzing and processing shooting, and produces adjustment instruction according to the mass parameter of described image, and described adjustment instruction is sent to driver module;
Described driver module is also for lens moving described in motor driving according to described adjustment order-driven, and the distance of described lens moving after adjustment is fed back to described control module, to make the corresponding relation of object distance and motor driving instruction described in described control module correction.
4. camera module according to claim 3, is characterized in that, the light that described transmitter unit is launched is laser or infrared light.
5. camera module according to claim 4, it is characterized in that, the corresponding relation of described object distance and motor driving instruction sets up according to the corresponding relation of the corresponding relation of object distance and camera lens distance to be moved and camera lens distance to be moved and motor driving instruction.
6. camera module according to claim 5, is characterized in that, the corresponding relation of described object distance and camera lens distance to be moved obtains according to focal length formula.
7. camera module according to claim 6, it is characterized in that, the corresponding relation of the distance that described camera lens is to be moved and motor driving instruction is that the slope calculated according to the driving instruction of the long shot of camera module distance to be moved and measurement and close up shots distance to be moved and driving instruction obtains.
8. an Atomatic focusing method for camera module, is characterized in that, comprising:
Measure the object distance of camera module and object to be shot;
According to the corresponding relation of object distance and motor driving instruction, determine the driving instruction corresponding with the object distance of described measurement;
Export described driving instruction to motor, make described motor driving lens moving to corresponding focusing position, realize auto-focusing.
9. method according to claim 8, is characterized in that, also comprises:
Photographic images after described lens moving to focusing position, and the position adjusting described camera lens according to the mass parameter of described image;
The corresponding relation of object distance and motor driving instruction according to the distance correction of adjustment rear lens movement.
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