CN105704380A - Camera focusing method and electric device - Google Patents
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- CN105704380A CN105704380A CN201610120635.4A CN201610120635A CN105704380A CN 105704380 A CN105704380 A CN 105704380A CN 201610120635 A CN201610120635 A CN 201610120635A CN 105704380 A CN105704380 A CN 105704380A
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- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000004886 process control Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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Abstract
The invention relates to the electric technical field, and discloses a camera focusing method and an electric device. The camera focusing method is applied to the electric device including a camera module, a ranging module, and a processer, and includes the following steps that: the processer obtains a current shooting distance of the electric device relative to a shooting object through the ranging module; the processer obtains a focusing length corresponding to the current shooting distance; and the process controls the camera module to adjust the focusing length corresponding to the current shooting distance so as to realize the focusing. In the embodiment of the invention, the accurate focusing of the camera is fast realized.
Description
Technical field
The present invention relates to electronic technology field, particularly to a kind of camera focusing method and electronic equipment。
Background technology
Along with the fast development of electronic technology and image processing techniques, the camera function of terminal is from strength to strength。In the process of taking pictures, obtain the photo of better definition in order to clap, it is necessary to focus, namely come the position of automatic adjustable lens according to current scene to reach the photo of most fine definition。Existing focusing method has following several:
Traditional mobile phone camera, what its focusing adopted is contrast formula focusing system, and its principle is the contrast change according to focal point picture, lens location when searching contrast is maximum, the namely position of accurately focusing。Shortcoming is that focus process is loaded down with trivial details, it is necessary to be continually changing focusing position to confirm pinpointed focus。
The imageing sensor that phase-detection focusing system adopts is somewhat different, and the partial pixel point in photosensitive region is sacrificed, and these pixels are referred to as shelters pixel (MaskedPixels), is use in pairs。Distance between pixel, relatively changing in conjunction with them, it is possible to help system determines that camera lens needs how far to move for accurately focusing on earth。Being characterized in that focusing speed is fast, capture or shoot during mobile object not easily out of focus, shortcoming is failure of easily focusing when dark or picture contrast are not high。
The accurate of laser focusing is completely described as the automatic auxiliary focusing of infrared band laser, its principle is something like the optical rangefinder on old paraxonic camera, during work, the laser diode of photographic head surrounding can forwards launch the laser of infrared band, light returns after touching focusing object, arrived by sensor detecting, can calculating accurate distance, whole focus process is just as the light velocity, extremely fast。Owing to its ultimate principle is for finding range by launching laser-bounce, so even when rather dark or also can rapid focus when picture contrast is not high。Shortcoming is owing to adding extra Laser emission and receiving device, can bring extra power consumption when shooting。
Summary of the invention
It is an object of the invention to provide a kind of camera focusing method and electronic equipment, it is possible to quickly realize photographic head and precisely focus。
For solving above-mentioned technical problem, embodiments of the present invention provide a kind of camera focusing method, are applied to comprise the electronic equipment of photographic head module, range finding module and processor, comprise the steps of
Described processor obtains the described electronic equipment current shooting distance relative to reference object by described range finding module；
The described processor default corresponding relation according to shooting distance with focusing focal length, obtains the focusing focal length that described current shooting distance is corresponding；
Described processor controls described photographic head module and regulates the focusing focal length to described current shooting distance correspondence, to realize focusing。
Embodiments of the present invention additionally provide a kind of electronic equipment, comprise: housing, photographic head module, range finding module and processor；
Described processor is arranged in described housing；Described photographic head module and described range finding module are arranged at the same surface of described housing；
Described processor is connected to described photographic head module and described range finding module；
Wherein, described processor is for obtaining the described electronic equipment current shooting distance relative to reference object by described range finding module；For the default corresponding relation according to shooting distance with focusing focal length, obtain the focusing focal length that described current shooting distance is corresponding；The focusing focal length to described current shooting distance correspondence is regulated, to realize focusing for controlling described photographic head module。
Embodiment of the present invention is in terms of existing technologies, processor obtains the electronic equipment current shooting distance relative to reference object by module of finding range, then pass through the corresponding relation of shooting distance and focusing focal length, obtain the focusing focal length that current shooting distance is corresponding, last processor controls photographic head and regulates the focusing focal length to current shooting distance correspondence, focusing method is simple and easy to do, is affected less by light factor, even if can also realize the fast accurate focusing of photographic head under dark environment。
As further improvement, module of finding range described in embodiment of the present invention comprises high power infrared lamp and range sensor, is connected to described processor；Described electronic equipment also comprises infrared lamp power supply chip, and described infrared lamp power supply chip is connected to described high power infrared lamp and for powering for described high power infrared lamp；Wherein, the time difference of infrared emission light and described range sensor reception infrared external reflection light launched by described processor for calculating described high power infrared lamp；For according to presetting the light velocity and the described time difference described current shooting distance of calculating；Wherein, described infrared external reflection light is reflected to form by described reference object by least part of described infrared emission light。In present embodiment, utilizing infrared distance measurement principle to realize range finding, simple, hardware easily realizes。
As further improvement, described electronic equipment comprises mobile phone or panel computer。Substantially infrared lamp and distance-sensor (when being used for conversing, controlling screen light on and off) is all comprised due to current mobile phone or panel computer, therefore, present embodiment only needs to replace with infrared lamp of the prior art high power infrared lamp, and to increase infrared lamp power supply chip be that high power infrared lamp is powered。That is, existing mobile phone or panel computer are carried out little hardware modifications, technical scheme can be realized。
Accompanying drawing explanation
Fig. 1 is a kind of camera focusing method flow chart according to first embodiment of the invention；
Fig. 2 is the particular flow sheet of step 10 in Fig. 1；
Fig. 3 is the particular flow sheet of step 12 in Fig. 1；
Fig. 4 is according to the schematic diagram of electronic equipment in second embodiment of the invention；
Fig. 5 is according to the block diagram of electronic equipment in second embodiment of the invention。
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail。But, it will be understood by those skilled in the art that in each embodiment of the present invention, propose many ins and outs in order to make reader be more fully understood that the application。But, even without these ins and outs with based on the many variations of following embodiment and amendment, it is also possible to realize the application each claim technical scheme required for protection。
First embodiment of the present invention relates to a kind of camera focusing method, is applied to comprise the electronic equipment of photographic head module, range finding module and processor, is such as mobile phone, panel computer etc., next for mobile phone, embodiments of the present invention is illustrated。
Shown in flow chart 1, what first embodiment of the invention is discussed in detail realizes method:
Step 10, processor obtains current shooting distance。Specifically, processor can pass through the module acquisition electronic equipment current shooting distance relative to reference object of finding range。
What deserves to be explained is, embodiment of the present invention is when implementing, and described range finding module can comprise high power infrared lamp and range sensor。The concrete methods of realizing utilizing high power infrared lamp and range sensor measurement current shooting distance can in conjunction with the content shown in flow chart 2。Step 10 comprises following sub-step:
Sub-step 101, the moment T1 of infrared emission light launched by processor record high power infrared lamp。
Sub-step 102, processor recording distance sensor receives the moment T2 of infrared external reflection light。
Sub-step 103, processor calculates the time difference in two moment。
Sub-step 104, the processor time difference according to two moment calculated, calculate current shooting distance。Namely described processor is according to the default light velocity and described time difference T=T2-T1, calculates described current shooting distance, and computing formula is L=C*T/2, and wherein, C is for presetting the light velocity (C=299792458m/s)。
What deserves to be explained is, described infrared emission light has the characteristic that centrality not easily spreads by force, thus can ensure that described infrared external reflection light is reflected to form by described reference object by least part of described infrared emission light, making processor launch the time difference of infrared emission light and described range sensor reception infrared external reflection light according to high power infrared lamp, the shooting distance recorded is more accurate。
Being not limited to this, in the specific implementation, range finding module can also be ultrasonic sensor。Utilizing ultrasound wave to realize range finding, present embodiment is not specifically limited at this。
In conjunction with Fig. 1, processor obtains the electronic equipment current shooting relative to reference object apart from afterwards by module of finding range, and performs step 11。
Step 11, obtains the focusing focal length that current shooting distance is corresponding。Specifically, the content of this step is when implementing, it is possible to the corresponding relation of shooting distance with focusing focal length is preset in electronic equipment internal, to facilitate processor quickly to find the focusing focal length of correspondence according to current shooting distance, the time can be saved, improve the treatment effeciency of processor。
In the specific implementation, the corresponding relation of shooting distance and focusing focal length can be obtained by multiple method, present embodiment obtains in the way of test of many times, namely multiple shooting distance is chosen respectively, and under the shooting distance currently chosen, debug focal length, the focal length of the photographic head that record picture is corresponding time the most clear。For example: set known shooting distance (being such as 1 meter), the focal length of photographic head, the focal length of photographic head when records photographing picture is the most clear are constantly debugged；In the same way, the multi-group data of records photographing distance and focal length, different shooting distances can be with predetermined interval increasing or decreasing。Wherein, the default corresponding relation of shooting distance and focusing focal length can represent with the form of function, namely utilizes the multi-group data of record to carry out curve fitting the correlation function expression formula drawing shooting distance with focal length；Or, it is also possible to represent with the form of synopsis, namely directly set up shooting distance-focal length synopsis according to the shooting distance of record with the multi-group data of focal length。
Step 12, controls photographic head module and regulates the focusing focal length to current shooting distance correspondence。Specifically, described processor controls described photographic head module and regulates the focusing focal length to described current shooting distance correspondence, to realize focusing。
When implementing, described photographic head module can comprise camera body, lens and lens driving unit, described camera body is fixed on described housing, described lens are movably arranged at described camera body, and described lens driving unit is electrically connected at described processor and is mechanically connected to described lens。The particular content of this step can in conjunction with shown in flow chart 3。Step 12 comprises following sub-step:
Sub-step 120, processor produces currently to focus signal。Specifically, described processor produces currently to focus signal according to the focusing focal length that described current shooting distance is corresponding。
Sub-step 121, signal of currently focusing sends to lens driving unit。Specifically, described current focusing signal is sent to described lens driving unit after producing current focusing signal by processor。
Sub-step 122, lens driving unit drives lens to move to focusing focal length place。Specifically, described lens driving unit drives described lens to move the described focusing focal length place to described camera body according to described current focusing signal。
Embodiment of the present invention is in terms of existing technologies, the electronic equipment current distance relative to reference object is obtained by module of finding range, and the corresponding relation according to shooting distance with focusing focal length, obtain the focusing focal length that current shooting distance is corresponding, then control photographic head module to regulate to corresponding focusing focal length, it is possible to quickly realize auto-focusing, and focusing mode is simple, hardware is easily achieved, and focus effects is also more accurate。
The step of various methods divides above, is intended merely to description clear, it is achieved time can be merged into a step or some step is split, and is decomposed into multiple step, as long as comprising identical logical relation, all in the protection domain of this patent；To adding inessential amendment in algorithm or in flow process or introducing inessential design, but do not change the core design of its algorithm and flow process all in the protection domain of this patent。
Second embodiment of the invention relates to a kind of electronic equipment, described electronic equipment can be mobile phone, panel computer or smart camera etc., present embodiment illustrates for mobile phone, as shown in Figure 4, comprises: housing, photographic head module 40, range finding module 43 and processor。Wherein, described processor is arranged in described housing, and described photographic head module 40 and described range finding module 43 are arranged at the same surface of described housing；Described processor is connected to described photographic head module 40 and described range finding module 43。Wherein, described processor is for obtaining the described electronic equipment current shooting distance relative to reference object by described range finding module 43；For the default corresponding relation according to shooting distance with focusing focal length, obtain the focusing focal length that described current shooting distance is corresponding；The focusing focal length to described current shooting distance correspondence is regulated, to realize focusing for controlling described photographic head module。
It addition, what deserves to be explained is, shown in Fig. 5, in present embodiment, described range finding module 43 can also comprise high power infrared lamp and distance-sensor, is connected to described processor；Described electronic equipment also comprises infrared lamp power supply chip, and described infrared lamp power supply chip is connected to described high power infrared lamp and for powering for described high power infrared lamp, to ensure that high power infrared lamp can normal operation。Further, described electronic equipment also comprises supplying cell；Described supplying cell is connected to described infrared lamp power supply chip, directly to be powered for high power infrared lamp by described infrared lamp power supply chip。
In present embodiment, described photographic head module comprises camera body, lens and lens driving unit；Described camera body is fixed on described housing；Described lens are movably arranged at described camera body；Described lens driving unit is electrically connected at described processor and is mechanically connected to described lens。
It addition, described processor produces currently to focus signal for the focusing focal length corresponding according to described current shooting distance, and described current focusing signal is sent extremely described lens driving unit；For driving described lens to move the described focusing focal length place to described camera body according to described current focusing signal。
In embodiment of the present invention, described surface is the front surface of described housing, substantially infrared lamp and distance-sensor (when being used for conversing, controlling screen light on and off) is all comprised due to current mobile phone or panel computer, therefore, present embodiment only needs to replace with infrared lamp of the prior art high power infrared lamp, and to increase infrared lamp power supply chip be that high power infrared lamp is powered。That is, existing mobile phone or panel computer are carried out little hardware modifications, technical scheme can be realized。
Additionally, the high power infrared lamp front surface that be positioned at mobile phone the same as with front-facing camera range sensor in range finding module, can ensure that range sensor is all consistent with high power infrared lamp and the distance of made thing body and photographic head and made thing body, so the shooting distance that processor obtains is also more accurate。
It is seen that, present embodiment is the system embodiment corresponding with the first embodiment, and present embodiment can be worked in coordination enforcement with the first embodiment。The relevant technical details mentioned in first embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here。Correspondingly, the relevant technical details mentioned in present embodiment is also applicable in the first embodiment。
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the invention, and in actual applications, it is possible in the form and details it is done various change, without departing from the spirit and scope of the present invention。
Claims (10)
1. a camera focusing method, it is characterised in that be applied to comprise the electronic equipment of photographic head module, range finding module and processor；Described camera focusing method comprises the steps of
Described processor obtains the described electronic equipment current shooting distance relative to reference object by described range finding module；
The described processor default corresponding relation according to shooting distance with focusing focal length, obtains the focusing focal length that described current shooting distance is corresponding；
Described processor controls described photographic head module and regulates the focusing focal length to described current shooting distance correspondence, to realize focusing。
2. camera focusing method according to claim 1, it is characterised in that described range finding module comprises high power infrared lamp and range sensor；
Described processor obtains described electronic equipment relative to the step of the current shooting distance of reference object by described range finding module, comprises following sub-step:
Described processor calculates described high power infrared lamp and launches the time difference of infrared emission light and described range sensor reception infrared external reflection light；Wherein, described infrared external reflection light is reflected to form by described reference object by least part of described infrared emission light；
Described processor calculates described current shooting distance according to the default light velocity with described time difference。
3. camera focusing method according to claim 1, it is characterised in that the default corresponding relation of described shooting distance and focusing focal length represents with functional form。
4. camera focusing method according to claim 1, it is characterised in that described photographic head module comprises camera body, lens and lens driving unit；
Described processor controls described photographic head module and regulates the focusing focal length to described current shooting distance correspondence, to realize the step of focusing, comprises following sub-step:
Described processor produces currently to focus signal according to the focusing focal length that described current shooting distance is corresponding, and described current focusing signal is sent extremely described lens driving unit；
Described lens driving unit drives described lens to move the described focusing focal length place to described camera body according to described current focusing signal。
5. an electronic equipment, it is characterised in that comprise: housing, photographic head module, range finding module and processor；
Described processor is arranged in described housing；Described photographic head module and described range finding module are arranged at the same surface of described housing；
Described processor is connected to described photographic head module and described range finding module；
Wherein, described processor is for obtaining the described electronic equipment current shooting distance relative to reference object by described range finding module；For the default corresponding relation according to shooting distance with focusing focal length, obtain the focusing focal length that described current shooting distance is corresponding；The focusing focal length to described current shooting distance correspondence is regulated, to realize focusing for controlling described photographic head module。
6. electronic equipment according to claim 5, it is characterised in that described range finding module comprises high power infrared lamp and distance-sensor, is connected to described processor；
Described electronic equipment also comprises infrared lamp power supply chip, and described infrared lamp power supply chip is connected to described high power infrared lamp and for powering for described high power infrared lamp；
Wherein, the time difference of infrared emission light and described range sensor reception infrared external reflection light launched by described processor for calculating described high power infrared lamp；For according to presetting the light velocity and the described time difference described current shooting distance of calculating；
Wherein, described infrared external reflection light is reflected to form by described reference object by least part of described infrared emission light。
7. electronic equipment according to claim 6, it is characterised in that described electronic equipment also comprises supplying cell；Described supplying cell is connected to described infrared lamp power supply chip。
8. electronic equipment according to claim 5, it is characterised in that described photographic head module comprises camera body, lens and lens driving unit；
Described camera body is fixed on described housing；Described lens are movably arranged at described camera body；
Described lens driving unit is electrically connected at described processor and is mechanically connected to described lens；
Wherein, described processor produces currently to focus signal for the focusing focal length corresponding according to described current shooting distance, and described current focusing signal is sent extremely described lens driving unit；For driving described lens to move the described focusing focal length place to described camera body according to described current focusing signal。
9. the electronic equipment according to any one in claim 5 to 8, it is characterised in that described electronic equipment comprises mobile phone or panel computer。
10. electronic equipment according to claim 9, it is characterised in that described surface is the front surface of described housing。
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