CN105681644A - Focal distance adjusting method and device and terminal - Google Patents
Focal distance adjusting method and device and terminal Download PDFInfo
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- CN105681644A CN105681644A CN201410667693.XA CN201410667693A CN105681644A CN 105681644 A CN105681644 A CN 105681644A CN 201410667693 A CN201410667693 A CN 201410667693A CN 105681644 A CN105681644 A CN 105681644A
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- distance
- photographic head
- focal length
- visual field
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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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- Multimedia (AREA)
- Signal Processing (AREA)
- Automatic Focus Adjustment (AREA)
- Studio Devices (AREA)
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Abstract
The invention provides a focal distance adjusting method and device and a terminal. The method comprises following steps of determining the distance between an object and the lens in a camera for photographing the object; and adjusting the focal distance of the camera according to the determined distance. Through the method, the device and the terminal provided by the invention, the problem of poor photographing effect in the related technique resulted from the factthat the photographing terminal cannot adjust the focal distance is solved; the focal distance can be adjusted; and the photographing quality can be improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of focus adjustment method, device and terminal.
Background technology
At present, the terminal possessing shoot function gets more and more, and illustrates for smart mobile phone below. Mobile phone is very general communication tool, and every mobile phone is substantially all with camera function, and the camera function of mobile phone is from strength to strength, and quality of taking pictures is also more and more higher. With it, where no matter walk, can take pictures whenever and wherever possible, without specially with photographing unit, bring very big facility to our life. Except taking pictures, by the platform of smart mobile phone, it is also possible to carry out video calling etc., along with the upgrading of the lifting of network speed and the hardware of camera module, it is more and more frequent that the call of the video of mobile phone can be applied.
But it is in the related, when shooting or video, it is necessary to manual adjustments focal length, very inconvenient sometimes. Such as when autodyning, use post-positioned pick-up head sometimes, but owing to display screen is in front, oneself cannot on screen preview shooting image, can only with feeling to take pictures, often due to Focussing is improper, the effect taken is also bad, if video calling, often use front-facing camera, when being typically in speaking, to press close to mobile phone, just mobile phone can be left after finishing, if do not focused when pressing close to mobile phone and speaking, at this moment because distance mobile phone is too near, the other side is difficult to see oneself. Therefore, there is photo terminal in the related and cannot be carried out focus adjustment, the problem causing shooting effect difference.
Focus adjustment is cannot be carried out for the camera terminal existed in correlation technique, the problem causing shooting effect difference, effective solution is not yet proposed at present.
Summary of the invention
The invention provides a kind of focus adjustment method and device, cannot be carried out focus adjustment with the camera terminal at least solving to exist in correlation technique, the problem causing shooting effect difference.
According to an aspect of the invention, it is provided a kind of focus adjustment method, comprise determining that object and for the distance between lens in photographic head that described object is shot; The focal length of described photographic head is regulated according to the described distance determined.
Further, the focal length regulating described photographic head according to the described distance determined includes: obtain the corresponding relation of described distance and the focal length of described photographic head; The focal length of the described photographic head corresponding with described distance is determined according to described corresponding relation.
Further, before the described distance of acquisition with the corresponding relation of the focal length of described photographic head, also include: determine the angle of visual field of described photographic head according to the described distance obtained; The focal length of described photographic head is determined according to the described angle of visual field determined; Preserve the corresponding relation of described distance and the focal length of described photographic head.
Further, described distance according to obtaining determines that the angle of visual field of described photographic head includes: determine the described angle of visual field by equation below: R=x:(d × tan (θ/2) × 2), wherein, x is the width of described object, d is the distance of the lens of photographic head described in described object distance, θ is the described angle of visual field, and R is the ratio of described object and width of finding a view, and the value of described R is one or more.
Further, it is determined that described object and for the distance between lens in photographic head that described object is shot include in the following manner at least one: laser ranging method, ultrasonic ranging method, dual camera telemetry.
According to a further aspect in the invention, it is provided that a kind of focal length adjustment device, comprise determining that module, for determining object and for the distance between lens in photographic head that described object is shot; Adjustment module, for regulating the focal length of described photographic head according to the described distance determined.
Further, described adjustment module includes: acquiring unit, for obtaining the described distance corresponding relation with the focal length of described photographic head; First determines unit, for determining the focal length of the described photographic head corresponding with described distance according to described corresponding relation.
Further, described adjustment module also includes: second determines unit, for determining the angle of visual field of described photographic head according to the described distance obtained; 3rd determines unit, for determining the focal length of described photographic head according to the described angle of visual field determined; Storage unit, for preserving the described distance corresponding relation with the focal length of described photographic head.
Further, described second determines that unit includes: determine the described angle of visual field by equation below: R=x:(d × tan (θ/2) × 2), wherein, x is the width of described object, d is the distance of the lens of photographic head described in described object distance, θ is the described angle of visual field, and R is the ratio of described object and width of finding a view, and the value of described R is one or more.
Further, determining in module described, at least one determines described object and for the distance between lens in photographic head that described object is shot in the following way: laser ranging method, ultrasonic ranging method, dual camera telemetry.
According to a further aspect in the invention, it is provided that a kind of terminal, including the device described in any of the above-described item.
By the present invention, adopt and determine object and for the distance between lens in photographic head that described object is shot; Regulate the focal length of described photographic head according to the described distance determined, solve the camera terminal existed in correlation technique and cannot be carried out focus adjustment, the problem causing shooting effect difference, and then reached to realize focus adjustment, improve the effect of shooting quality.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 is the flow chart of focus adjustment method according to embodiments of the present invention;
Fig. 2 is the structured flowchart of focal length adjustment device according to embodiments of the present invention;
Fig. 3 is the structured flowchart of adjustment module 24 in focal length adjustment device according to embodiments of the present invention;
Fig. 4 is the preferred structure block diagram of adjustment module 24 in focal length adjustment device according to embodiments of the present invention;
Fig. 5 is the structured flowchart of terminal according to embodiments of the present invention;
Fig. 6 is the corresponding relation figure between focal length according to embodiments of the present invention, the angle of visual field and field range;
Fig. 7 is the corresponding relation figure of distance according to embodiments of the present invention and the angle of visual field;
Fig. 8 is the flow chart focused according to embodiments of the present invention.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments. It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.
Providing a kind of focus adjustment method in the present embodiment, Fig. 1 is the flow chart of focus adjustment method according to embodiments of the present invention, as it is shown in figure 1, this flow process comprises the steps:
Step S102, it is determined that object and for the distance between lens in photographic head that object is shot;
Step S104, regulates the focal length of photographic head according to the distance determined.
Pass through above-mentioned steps, utilize the distance between photographic head and shooting object to regulate the focal length of photographic head, solve the camera terminal existed in correlation technique and cannot be carried out focus adjustment, the problem causing shooting effect difference, and then reached to realize focus adjustment, improve the effect of shooting quality.
The method of the focal length regulating photographic head has multiple, the corresponding relation of multiple above-mentioned distance and the focal length of photographic head can be set according to user preferences in advance, when shooting, this corresponding relation can be called, at the focal length that just may determine that photographic head according to actual range, thus utilizing most suitable focal length to shoot, improve shooting quality.
Above-mentioned corresponding relation can be pre-stored in the terminal belonging to photographic head, it is also possible to obtains otherwise, for instance networking, bluetooth. When needs shoot, it is possible to obtain this corresponding relation, in an optional embodiment, before obtaining distance and the corresponding relation of the focal length of photographic head, also include: determine the angle of visual field of photographic head according to the distance obtained; The focal length of photographic head is determined according to the angle of visual field determined; Preserve the corresponding relation of distance and the focal length of photographic head.
Wherein, the angle of visual field of photographic head can be determined in the following way: determine this angle of visual field by equation below: R=x:(d × tan (θ/2) × 2), wherein, x is the width of object, d is the distance of the lens of object distance photographic head, θ is the angle of visual field, and R is the ratio of object and width of finding a view, and the value of R is one or more.
When determining object and for distance between lens in photographic head that this object is shot, it is possible in the following ways at least one: laser ranging method, ultrasonic ranging method, dual camera telemetry. Other modes can certainly be adopted to carry out determination of distance.
Additionally providing a kind of focal length adjustment device in the present embodiment, this device is used for realizing above-described embodiment and preferred implementation, has be carried out repeating no more of explanation. As used below, term " module " can realize the software of predetermined function and/or the combination of hardware. Although the device described by following example preferably realizes with software, but hardware, or the realization of the combination of software and hardware is also likely to and is contemplated.
Fig. 2 is the structured flowchart of focal length adjustment device according to embodiments of the present invention, as in figure 2 it is shown, this device includes determining module 22 and adjustment module 24, below this device is illustrated.
Determine module 22, for determining object and for the distance between lens in photographic head that this object is shot; Adjustment module 24, is connected to above-mentioned determine module 22, for regulating the focal length of photographic head according to the distance determined.
Fig. 3 is the structured flowchart of adjustment module 24 in focal length adjustment device according to embodiments of the present invention, as it is shown on figure 3, this adjustment module 24 includes acquiring unit 32 and first determines unit 34, below this adjustment module 24 is illustrated.
Acquiring unit 32, for obtaining the above-mentioned distance corresponding relation with the focal length of photographic head; First determines unit 34, is connected to above-mentioned acquiring unit 32, for determining the focal length of the photographic head corresponding with above-mentioned distance according to above-mentioned corresponding relation.
Fig. 4 is the preferred structure block diagram of adjustment module 24 in focal length adjustment device according to embodiments of the present invention, as shown in Figure 4, this adjustment module 24 is except including all unit shown in Fig. 3, also include second and determine that unit the 42, the 3rd determines unit 44 and storage unit 46, below this adjustment module 24 is illustrated.
Second determines unit 42, for determining the angle of visual field of photographic head according to the distance obtained; 3rd determines unit 44, is connected to above-mentioned second and determines unit 42, for determining the focal length of photographic head according to the angle of visual field determined; Storage unit 46, is connected to the above-mentioned 3rd and determines unit 44 and acquiring unit 32, for preserving the distance corresponding relation with the focal length of photographic head.
Wherein, second determines that unit 42 includes: determine the angle of visual field by equation below: R=x:(d × tan (θ/2) × 2), wherein, x is the width of object, d is the distance of the lens of object distance photographic head, θ is the angle of visual field, and R is the ratio of object and width of finding a view, and the value of R is one or more.
Determine that the mode of the distance between shooting object and photographic head can by multiple, in an optional embodiment, in determining module 22, it is possible at least one determines object and for the distance between lens in photographic head that this object is shot in the following way: laser ranging method, ultrasonic ranging method, dual camera telemetry.
Fig. 5 is the structured flowchart of terminal according to embodiments of the present invention, as it is shown in figure 5, this terminal 52 includes the focal length adjustment device 54 of any of the above-described.
Below with above-mentioned terminal be the mobile phone that can shoot, subject be artificial example, from measuring and calculating people and mobile phone distance and according to results of measuring adjusting focal length two aspect, the present invention will be described.
The distance of measuring and calculating people and mobile phone:
The collection of range information has multiple method, such as can according to laser ranging, ultrasonic ranging, and the method such as dual camera range finding.
Laser range finder is to utilize laser that the distance of target is carried out the instrument of Accurate Determining. Laser range finder operationally penetrates a branch of very thin laser to target, photoelectric cell receive the laser beam of target reflection, and timer measures laser beam from the time being transmitted into reception, calculates from observer's range-to-go.
Ultrasonic ranging sends ultrasound wave by ultrasonic transmission device, receive time difference during ultrasound wave according to receptor it is known that distance. This is similar to radar range finding principle. Ultrasonic transmitter launches ultrasound wave to a direction, and in the timing that starts simultaneously at of x time, ultrasound wave is propagated in atmosphere, encounters barrier and just return immediately in way, and ultrasonic receiver receives echo and just stops timing immediately. (the aerial spread speed of ultrasound wave is 340m/s, the time t according to timer record, it is possible to calculate the launch point distance (s) from barrier, it may be assumed that s=340t/2).
Distance according to people Yu mobile phone, calculates and focuses:
Fig. 6 is the corresponding relation figure between focal length according to embodiments of the present invention, the angle of visual field and field range, as can be seen from Figure 6, under the premise that object distance is identical, viewfinder range also has relation with the angle of visual field, so to obtain suitable picture ratio it is necessary to the relation that calculates between object distance and the angle of visual field and focal length. Its relation is, when distance one timing of people with camera lens, the angle of visual field of camera lens is more big, then viewfinder range is more big, and namely people's ratio in picture of finding a view is more little, and focal length is more big, then viewfinder range is more little, and now people's ratio in picture of finding a view is more big.
The angle of visual field of camera lens assumed below is θ, then can pass through to calculate or actual measurement, determine in people and the camera lens focal position when some specific range. Such as, if by actual measurement, it is possible to when people is with camera lens certain distance (distance is with reference to table 1 below), see that in picture of finding a view, whether the ratio of whole pictures shared by people is suitable, as improper, then adjusting focal length, and record now focal length. So repeatedly, record focal length during other positions respectively, the camera lens of the following a certain angle of visual field, the focal length value corresponding when different distance can be obtained.
Fig. 7 is the corresponding relation figure of distance according to embodiments of the present invention and the angle of visual field, and in the figure 7, people is d from distance from the lens, the angle of visual field of camera lens is θ, it is assumed that the width of people is x, in people's location, the width found a view is y, then can obtain equation below:
Y=d × tan (θ/2) × 2;
In this distance, the width of people accounts for the width of whole pictures and is:
R=x:y=x:(d × tan (θ/2) × 2),
Here R is this distance, and people accounts for the ratio of whole figure, this can according to user oneself like carry out value, such as 1/5 or 1/6 etc. If in the value that this position calculation goes out, be not inconsistent with desired value, then can focus, and then the value changing d changes proportionate relationship, until obtaining satisfactory value, and writes down focal position now.
Pass through above method, we can obtain one group of parameter table about the angle of visual field and object distance and focal length, when the angle of visual field is fixing, time within people's 0.5 meter of camera lens of distance, focus adjustment to k1 position, satisfied aspect ratio can be obtained, when within the scope of people's 0.5 meter to 1 meter of camera lens of distance, focus adjustment is to k2 position, satisfied aspect ratio can be obtained, by that analogy ..., when changing camera lens, because the angle of visual field can change, so the proportionality coefficient in form is also required to corresponding adjustment.
Table 1
| The angle of visual field | θ | θ | θ | θ | θ | θ | …… |
| Distance (rice) | [0,0.5] | [0.5,1] | [1,2] | [2,3] | [3,4] | [4,5] | …… |
| Proportionality coefficient | K1 | K2 | K3 | K4 | K5 | K6 | …… |
After obtaining form above, it is possible to automatically focus position by tabling look-up, obtaining satisfied picture, flow chart can as shown in Figure 8, and Fig. 8 is the flow chart focused according to embodiments of the present invention, and this flow process comprises the steps:
Step S802, starts preview of taking pictures;
Step S804, obtains the distance of people and camera lens;
Step S806, tables look-up 1 to proportionality coefficient;
Step S808, it is judged that whether proportionality coefficient changes, when judged result is no, goes to step S804, when judged result is for being, goes to step S810;
Step S810, adjusting focal length.
By above-described embodiment it can be seen that the focal length of mobile phone according to the distance of people Yu mobile phone, dynamically can be adjusted, in the photo got rid of or video, ensure that people is in a suitable ratio all the time, thus being greatly promoted Consumer's Experience. Certainly in the terminal, it is possible to this function focused is as option, if user does not need, it is possible to close, open again when needs, very flexibly.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or it is distributed on the network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, can be stored in storage device is performed by calculation element, and in some cases, shown or described step can be performed with the order being different from herein, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize. so, the present invention is not restricted to the combination of any specific hardware and software.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (11)
1. a focus adjustment method, it is characterised in that including:
Determine object and for the distance between lens in photographic head that described object is shot;
The focal length of described photographic head is regulated according to the described distance determined.
2. method according to claim 1, it is characterised in that include according to the focal length that the described distance determined regulates described photographic head:
Obtain the corresponding relation of described distance and the focal length of described photographic head;
The focal length of the described photographic head corresponding with described distance is determined according to described corresponding relation.
3. method according to claim 2, it is characterised in that before the described distance of acquisition with the corresponding relation of the focal length of described photographic head, also include:
The angle of visual field of described photographic head is determined according to the described distance obtained;
The focal length of described photographic head is determined according to the described angle of visual field determined;
Preserve the corresponding relation of described distance and the focal length of described photographic head.
4. method according to claim 3, it is characterised in that the described distance according to obtaining determines that the angle of visual field of described photographic head includes:
The described angle of visual field is determined by equation below:
R=x:(d × tan (θ/2) × 2)
Wherein, x is the width of described object, and d is the distance of the lens of photographic head described in described object distance, and θ is the described angle of visual field, and R is the ratio of described object and width of finding a view, and the value of described R is one or more.
5. method according to claim 1, it is characterised in that determine described object and for the distance between lens in photographic head that described object is shot include in the following manner at least one:
Laser ranging method, ultrasonic ranging method, dual camera telemetry.
6. a focal length adjustment device, it is characterised in that including:
Determine module, for determining object and for the distance between lens in photographic head that described object is shot;
Adjustment module, for regulating the focal length of described photographic head according to the described distance determined.
7. device according to claim 6, it is characterised in that described adjustment module includes:
Acquiring unit, for obtaining the described distance corresponding relation with the focal length of described photographic head;
First determines unit, for determining the focal length of the described photographic head corresponding with described distance according to described corresponding relation.
8. device according to claim 7, it is characterised in that shown adjustment module also includes:
Second determines unit, for determining the angle of visual field of described photographic head according to the described distance obtained;
3rd determines unit, for determining the focal length of described photographic head according to the described angle of visual field determined;
Storage unit, for preserving the described distance corresponding relation with the focal length of described photographic head.
9. device according to claim 8, it is characterised in that described second determines that unit includes:
The described angle of visual field is determined by equation below:
R=x:(d × tan (θ/2) × 2)
Wherein, x is the width of described object, and d is the distance of the lens of photographic head described in described object distance, and θ is the described angle of visual field, and R is the ratio of described object and width of finding a view, and the value of described R is one or more.
10. device according to claim 6, it is characterised in that determine in module described, at least one determines described object and for the distance between lens in photographic head that described object is shot in the following way:
Laser ranging method, ultrasonic ranging method, dual camera telemetry.
11. a terminal, it is characterised in that include the device according to any one of claim 6 to 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410667693.XA CN105681644A (en) | 2014-11-20 | 2014-11-20 | Focal distance adjusting method and device and terminal |
| PCT/CN2015/074540 WO2016078269A1 (en) | 2014-11-20 | 2015-03-18 | Focus adjustment method, device and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410667693.XA CN105681644A (en) | 2014-11-20 | 2014-11-20 | Focal distance adjusting method and device and terminal |
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| CN105681644A true CN105681644A (en) | 2016-06-15 |
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| CN201410667693.XA Pending CN105681644A (en) | 2014-11-20 | 2014-11-20 | Focal distance adjusting method and device and terminal |
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| WO (1) | WO2016078269A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106303256A (en) * | 2016-08-31 | 2017-01-04 | 广东小天才科技有限公司 | A kind of determination method and device of acquisition parameters |
| CN106646819A (en) * | 2016-12-02 | 2017-05-10 | 深圳天珑无线科技有限公司 | Single-hole laser focusing realization device and method |
| CN106772338A (en) * | 2016-11-25 | 2017-05-31 | 杭州捍鹰科技有限公司 | Unmanned machine positioning device, method and system |
| CN106873124A (en) * | 2016-12-27 | 2017-06-20 | 广东工业大学 | A kind of method for automatically adjusting focal length |
| CN111025321A (en) * | 2019-12-28 | 2020-04-17 | 深圳奥比中光科技有限公司 | Variable-focus depth measuring device and measuring method |
| CN111551346A (en) * | 2020-04-13 | 2020-08-18 | 深圳惠牛科技有限公司 | Method, device and system for measuring field angle and computer storage medium |
| CN111982468A (en) * | 2020-07-29 | 2020-11-24 | 深圳惠牛科技有限公司 | Method, device and system for measuring field angle and computer storage medium |
| WO2022135260A1 (en) * | 2020-12-21 | 2022-06-30 | 维沃移动通信有限公司 | Photographing method and apparatus, electronic device and readable storage medium |
| WO2024119620A1 (en) * | 2022-12-05 | 2024-06-13 | 深圳看到科技有限公司 | Multi-head camera picture splicing method and device and storage medium |
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| CN113727064B (en) * | 2020-05-26 | 2024-03-22 | 北京罗克维尔斯科技有限公司 | Method and device for determining camera field angle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106303256A (en) * | 2016-08-31 | 2017-01-04 | 广东小天才科技有限公司 | A kind of determination method and device of acquisition parameters |
| CN106772338A (en) * | 2016-11-25 | 2017-05-31 | 杭州捍鹰科技有限公司 | Unmanned machine positioning device, method and system |
| CN106772338B (en) * | 2016-11-25 | 2020-01-21 | 杭州捍鹰科技有限公司 | Unmanned aerial vehicle positioning device, method and system |
| CN106646819A (en) * | 2016-12-02 | 2017-05-10 | 深圳天珑无线科技有限公司 | Single-hole laser focusing realization device and method |
| CN106873124A (en) * | 2016-12-27 | 2017-06-20 | 广东工业大学 | A kind of method for automatically adjusting focal length |
| CN111025321A (en) * | 2019-12-28 | 2020-04-17 | 深圳奥比中光科技有限公司 | Variable-focus depth measuring device and measuring method |
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| CN111551346A (en) * | 2020-04-13 | 2020-08-18 | 深圳惠牛科技有限公司 | Method, device and system for measuring field angle and computer storage medium |
| CN111551346B (en) * | 2020-04-13 | 2022-04-01 | 深圳惠牛科技有限公司 | Method, device and system for measuring field angle and computer storage medium |
| CN111982468A (en) * | 2020-07-29 | 2020-11-24 | 深圳惠牛科技有限公司 | Method, device and system for measuring field angle and computer storage medium |
| WO2022135260A1 (en) * | 2020-12-21 | 2022-06-30 | 维沃移动通信有限公司 | Photographing method and apparatus, electronic device and readable storage medium |
| WO2024119620A1 (en) * | 2022-12-05 | 2024-06-13 | 深圳看到科技有限公司 | Multi-head camera picture splicing method and device and storage medium |
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|---|---|
| WO2016078269A1 (en) | 2016-05-26 |
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