CN104567652A - Method and device for obtaining rotation angle of camera - Google Patents
Method and device for obtaining rotation angle of camera Download PDFInfo
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- CN104567652A CN104567652A CN201410810500.1A CN201410810500A CN104567652A CN 104567652 A CN104567652 A CN 104567652A CN 201410810500 A CN201410810500 A CN 201410810500A CN 104567652 A CN104567652 A CN 104567652A
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Abstract
The invention is applicable to the field of imaging and provides a method for obtaining a rotation angle of a camera. The method comprises the following steps: obtaining a first sampling value collected by a Hall sensor and a second sampling value collected by a magnetic calibration sensor; according to the corresponding relations between the rotation angle and the preset first sampling value and between rotation angle and the preset second sampling value, finding out the rotating angles corresponding to the collected first sampling value and the collected second sampling value. According to the invention, the strength of an interference magnetic signal can be obtained at the current scene through the second sampling value, and the rotation angle of the camera actually corresponding to the first sampling value can be obtained through the strength of the interference magnetic signal, so that the precision of the rotating angle, measured in the magnetic field environment, of the camera can be improved, therefore, the camera is better controlled to rotate.
Description
Technical field
The invention belongs to imaging field, particularly relate to rotation angle of camera acquisition methods and device.
Background technology
In order to improve the convenience that intelligent terminal is taken pictures, a lot of intelligent terminal is all provided with rotating camera now, constant at maintenance terminal location, can obtain the image at multiple visual angle easily.As being all provided with rotating camera in current many mobile phones.
When using rotating camera to take pictures, need to carry out rotation process to camera.Rotation process conventional at present controls to be realized by Hall element.The size in the magnetic field of magnet in rotating camera is sensed by Hall element, in the process that camera rotates, distance between magnet and Hall element is different, and so the sampled value that obtains of Hall element is also different, can be searched the angle of camera by this value.
But because magnetic field is easy to be interfered, when the electromagnetic environment residing for mobile phone is different, the numerical value of so Hall element collection is also just different, thus the precision of the camera angle value making the sampled value obtained by Hall element obtain is not high.
Summary of the invention
The object of the present invention is to provide a kind of rotation angle of camera acquisition methods and device, be easy to be interfered to solve prior art due to magnetic field, when the electromagnetic environment residing for mobile phone is different, so the numerical value of Hall element collection is also just different, thus the problem that the precision of the camera angle value that the sampled value obtained by Hall element is obtained is not high.
The present invention is achieved in that a kind of rotation angle of camera acquisition methods, and described camera arranges magnet, and described camera installation position is provided with Hall element and magnetic calibrating sensors, and described method comprises:
Obtain the first sampled value that described Hall element gathers, and the second sampled value that described magnetic calibrating sensors gathers;
According to the corresponding relation of the first sampled value preset, the second sampled value and the anglec of rotation, search the anglec of rotation corresponding to the second sampled value of the first sampled value of collection, collection.
Another object of the present invention is to provide a kind of rotation angle of camera acquisition device, described camera arranges magnet, described camera installation position is provided with Hall element and magnetic calibrating sensors, and described device comprises:
Acquiring unit, for obtaining the first sampled value that described Hall element gathers, and the second sampled value that described magnetic calibrating sensors gathers;
Search unit, for according to the corresponding relation of the first sampled value, the second sampled value and the anglec of rotation preset, search the anglec of rotation corresponding to the second sampled value of the first sampled value of collection, collection.
In the present invention, by the Hall element that arranges in camera installation position and magnetic calibrating sensors, obtain the first sampled value and the second sampled value respectively, the intensity of the interference magnetic signal under current scene can be known by the second sampled value, the actual corresponding rotation angle of camera of the first sampled value can be known by the intensity of described interference magnetic signal, thus the precision of the anglec of rotation that camera records under magnetic field environment can be improved, thus better control camera rotation.
Accompanying drawing explanation
Fig. 1 is the camera structure schematic diagram that the embodiment of the present invention provides;
Fig. 2 is the realization flow figure of the rotation angle of camera acquisition methods that the embodiment of the present invention provides;
Fig. 3 is the corresponding relation schematic diagram of the size of the value of the Hall element that the embodiment of the present invention provides and the anglec of rotation of camera;
Fig. 4 is the realization flow figure of the determination methods of the second sampled value that the embodiment of the present invention provides;
Fig. 5 is the structural representation of the rotation angle of camera acquisition device that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The fundamental purpose of the embodiment of the present invention is because rotation angle accuracy is not high, and to be not easy to the problem that the precision of the acquisition rotation angle of camera existed in solution prior art is not high carry out rotation control to camera, such as to rotate how many degree and reset etc.Because rotation angle accuracy is not high, can make easily to block phenomenon when rotating, affect motor serviceable life.
Rotation angle measurement method of the prior art, as shown in Figure 1, generally on camera, be provided with magnet, the mainboard of mobile phone is provided with Hall element, because camera is provided with one end of camera, therefore, when camera rotates, magnet on camera and the distance between Hall element change, when described magnet distance Hall element is nearer, then Hall element can detect stronger magnetic field, and when described magnet distance Hall element is far away, then the magnetic field of Hall element detection is more weak.According to the power in the magnetic field detected, namely judge the anglec of rotation of camera accordingly.
But, environment residing for mobile phone also may can be subject to the impact in magnetic field, when extraneous influence of magnetic field is to the sampled value of described Hall element, the rotation angle value of detection then can be made inaccurate, thus can affect the rotation of camera is controlled, such as controlling easily stall to occur when camera resets, namely making suddenly camera stop the rotation, thus the serviceable life of camera motor can be affected.
For solving the problem, the present invention proposes a kind of rotation angle of camera acquisition methods, described camera arranges magnet, described camera installation position is provided with Hall element and magnetic calibrating sensors, described method comprises: obtain the first sampled value that described Hall element gathers, and the second sampled value that described magnetic calibrating sensors gathers; According to the corresponding relation of the first sampled value preset, the second sampled value and the anglec of rotation, search the anglec of rotation corresponding to the second sampled value of the first sampled value of collection, collection.
By the Hall element that arranges in camera installation position and magnetic calibrating sensors, obtain the first sampled value and the second sampled value respectively, the intensity of the interference magnetic signal under current scene can be known by the second sampled value, the actual corresponding rotation angle of camera of the first sampled value can be known by the intensity of described interference magnetic signal, thus the precision of the anglec of rotation that camera records under magnetic field environment can be improved, thus better control camera rotation.Illustrate below in conjunction with accompanying drawing.
Fig. 2 shows the realization flow of the rotation angle of camera acquisition methods that the embodiment of the present invention provides, and details are as follows:
In step s 201, obtain the first sampled value that described Hall element gathers, and the second sampled value that described magnetic calibrating sensors gathers.
Concrete, on the prior art basis shown in Fig. 1, the present invention also comprises a magnetic calibrating sensors, and whether described magnetic calibrating sensors is used for the current residing environment of checkout equipment magnetic interference signal.
Generally, when the external world does not disturb, the size of the value of described Hall element and the anglec of rotation of camera as shown in Figure 3, in figure 3, transverse axis represent the angle value that camera rotates, the longitudinal axis represent the ADC of camera on corresponding angle after Hall value.For general mobile phone, the maximum anglec of rotation is 206 degree.According to the data of statistics, the Hall value of Hall element is near 180 degree be maximum in the anglec of rotation, and now Hall element distance magnet is nearest.Certainly, for different mobile phones, Hall value have some deviations, but general trend is identical.Also, namely, when mobile phone is in larger magnetic interference, although Hall value corresponding to each angle changes, total variation tendency is still identical.When not disturbing, can corresponding relation in form according to Fig. 3, search the anglec of rotation that the first sampled value of Hall value sensor is corresponding fast and effectively.
When the external world does not disturb, described magnetic calibrating sensors be shown as normal value, the numerical value such as shown can be zero.When described magnetic calibrating sensors detects the field signal of interference, then can show the intensity level of the disturbing magnetic field signal of detection, or the magnetic field interfere information such as the direction that can also comprise magnetic field.
Such as, described magnetic calibrating sensors can for the Magnetic Sensor for obtaining magnetic field of the earth, and the north and south that can be used for indicating terminal is pointed to.When terminal is subject to the interference in magnetic field, so magnetic calibrating sensors also can be interfered, and magnetic calibrating sensors can obtain the intensity size of magnetic interference, and namely interference strength is larger, and so the deviation of Magnetic Sensor identification North and South direction is also larger.By identifying intensity size and the direction of disturbing magnetic field, the Hall value that can detect for described Hall element is searched corresponding rotation angle of camera and is provided reference.
In step S202, according to the corresponding relation of the first sampled value preset, the second sampled value and the anglec of rotation, search the anglec of rotation corresponding to the second sampled value of the first sampled value of collection, collection.
Before this step, the method for the invention also comprises the step setting up corresponding relation, is specially and sets up multiple first sampled value, respectively under the condition of multiple second sampled value, with the corresponding relation of rotation angle of camera.
Described multiple first sampled value, respectively under multiple second sampled value condition with the corresponding relation of rotation angle of camera, following several situation can be comprised:
1, described second sampled value being divided into multiple interval, when getting the second sampled value, searching this region belonging to the second sampled value, in the rotation angle value that this range lookup first sampled value is corresponding;
2, the first sampled value and the second sampled value are divided into multiple interval respectively, search interval that the first sampled value belongs to and, search the interval belonging to the second sampled value, obtain the angle value searching affiliated interval correspondence further;
3, the rotation angle value that any first sampled value is corresponding respectively under any two sampled value conditions is set up.
In above-mentioned three kinds of situations, the first and the second corresponding relation are comparatively simple, but the precision obtained is high not as the third precision.And the third corresponding relation set up needs to store more data, to obtain the pivoting angle data of more precision.
Wherein, described any first sampled value, refers to the arbitrary value in the first sampled value interval, as shown in Figure 3, described first sampled value interval be generally be greater than-100 and be less than 50 interval.
Described arbitrary second sampled value, also an interval value defined should be had, when the signal intensity of described interference is greater than the several times of the intensity in the magnetic field of the magnet on described camera, the Strength Changes in the magnetic field on the camera now detected by Hall element is too small, the accuracy value of the anglec of rotation obtained under the disturbing magnetic field that intensity is larger is lower, and the second sampled value in the case can not need to carry out statistics and store.
Therefore, corresponding, before step S202, the present invention can also comprise the determining step of the second sampled value as shown in Figure 4, specifically comprises:
In step S401, judge whether the second sampled value gathered is greater than predetermined interference threshold;
Wherein, described interference threshold, can for being greater than the size of the several times of the magnetic field intensity of the magnet on described camera.
In step S402, if the second sampled value gathered is greater than predetermined interference threshold, then send the excessive information of magnetic interference intensity.
When the magnetic field of the magnet on described camera is much smaller than the size of disturbing magnetic field, the variable quantity of the measured value of Hall element then can accurately not be calculated according to disturbing magnetic field, therefore information can be sent, such as tell that user " allows mobile phone disturb away from magnet ", or the larger anglec of rotation also can be adopted to carry out rotation control, camera during this time may be caused to occur stall phenomenon.
Another preferred embodiment in, the first sampled value that the described Hall element of described acquisition gathers, and in the second sampled value step of gathering of described magnetic calibrating sensors, the speed of described collection first sampled value, the speed gathering the second sampled value are identical.Like this, often collecting first sampled value, also can collect a second collection value simultaneously, searched by described first sampled value and the second sampled value and obtain corresponding rotation angle of camera.
Certainly, further excellent, the speed of described collection first sampled value, the speed gathering the second sampled value are directly proportional to the speed that camera rotates.The benefit done like this is, when camera rotational speed can be made very fast, also can obtain the change of rotation angle of camera timely and effectively, thus provides effective reference data for controlling camera rotation.
The structural representation of the rotation angle of camera acquisition device that Fig. 5 provides for the embodiment of the present invention, described camera arranges magnet, described camera installation position is provided with Hall element and magnetic calibrating sensors, and described rotation angle of camera acquisition device comprises:
Acquiring unit 501, for obtaining the first sampled value that described Hall element gathers, and the second sampled value that described magnetic calibrating sensors gathers;
Search unit 502, for according to the corresponding relation of the first sampled value, the second sampled value and the anglec of rotation preset, search the anglec of rotation corresponding to the second sampled value of the first sampled value of collection, collection.
Preferably, described device also comprises:
Judging unit, for judging whether the second sampled value gathered is greater than predetermined interference threshold;
Information transmitting element, if be greater than predetermined interference threshold for the second sampled value gathered, then sends the excessive information of magnetic interference intensity.
Preferably, described device also comprises:
Corresponding relation sets up unit, for setting up multiple first sampled value, respectively under the condition of multiple second sampled value, with the corresponding relation of rotation angle of camera.
Preferably, described collection first sampled value speed, gather the second sampled value speed identical.
Preferably, the speed of described collection first sampled value, the speed that gathers the second sampled value are directly proportional to the speed that camera rotates.
Rotation angle of camera acquisition device described in Fig. 5 is corresponding with rotation angle of camera acquisition methods described in Fig. 1 to Fig. 4, does not repeat at this.
In several embodiment provided by the present invention, should be understood that, disclosed apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, ROM (read-only memory) (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a rotation angle of camera acquisition methods, is characterized in that, described camera arranges magnet, and described camera installation position is provided with Hall element and magnetic calibrating sensors, and described method comprises:
Obtain the first sampled value that described Hall element gathers, and the second sampled value that described magnetic calibrating sensors gathers;
According to the corresponding relation of the first sampled value preset, the second sampled value and the anglec of rotation, search the anglec of rotation corresponding to the second sampled value of the first sampled value of collection, collection.
2. method according to claim 1, it is characterized in that, at the corresponding relation of the first sampled value, the second sampled value and the anglec of rotation that described basis presets, before searching the anglec of rotation step corresponding to the second sampled value of the first sampled value of collection, collection, described method also comprises:
Judge whether the second sampled value gathered is greater than predetermined interference threshold;
If the second sampled value gathered is greater than predetermined interference threshold, then send the excessive information of magnetic interference intensity.
3. method according to claim 1, it is characterized in that, at the corresponding relation of the first sampled value, the second sampled value and the anglec of rotation that described basis presets, before searching the anglec of rotation step corresponding to the second sampled value of the first sampled value of collection, collection, described method also comprises:
Set up multiple first sampled value, respectively under the condition of multiple second sampled value, with the corresponding relation of rotation angle of camera.
4. method according to claim 1, it is characterized in that, the first sampled value that the described Hall element of described acquisition gathers, and in the second sampled value step of gathering of described magnetic calibrating sensors, the speed of described collection first sampled value, the speed gathering the second sampled value are identical.
5. method according to claim 4, is characterized in that, the speed of described collection first sampled value, the speed gathering the second sampled value are directly proportional to the speed that camera rotates.
6. a rotation angle of camera acquisition device, is characterized in that, described camera arranges magnet, and described camera installation position is provided with Hall element and magnetic calibrating sensors, and described device comprises:
Acquiring unit, for obtaining the first sampled value that described Hall element gathers, and the second sampled value that described magnetic calibrating sensors gathers;
Search unit, for according to the corresponding relation of the first sampled value, the second sampled value and the anglec of rotation preset, search the anglec of rotation corresponding to the second sampled value of the first sampled value of collection, collection.
7. device according to claim 6, it is characterized in that, described device also comprises:
Judging unit, for judging whether the second sampled value gathered is greater than predetermined interference threshold;
Information transmitting element, if be greater than predetermined interference threshold for the second sampled value gathered, then sends the excessive information of magnetic interference intensity.
8. device according to claim 6, it is characterized in that, described device also comprises:
Corresponding relation sets up unit, for setting up multiple first sampled value, respectively under the condition of multiple second sampled value, with the corresponding relation of rotation angle of camera.
9. device according to claim 6, is characterized in that, the speed of described collection first sampled value, the speed gathering the second sampled value are identical.
10. device according to claim 9, is characterized in that, the speed of described collection first sampled value, the speed gathering the second sampled value are directly proportional to the speed that camera rotates.
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| CN104902171A (en) * | 2015-05-19 | 2015-09-09 | 广东欧珀移动通信有限公司 | Camera angle correction method and terminal |
| CN106066149A (en) * | 2016-06-07 | 2016-11-02 | 深圳市星苑科技有限公司 | It is accurately positioned camera head |
| CN110770647A (en) * | 2017-05-05 | 2020-02-07 | 剑桥机电有限公司 | SMA actuator with position sensor |
| CN111246108A (en) * | 2020-02-05 | 2020-06-05 | Oppo广东移动通信有限公司 | Hall sensor calibration method and device and anti-shake method and device |
| CN112118372A (en) * | 2019-06-20 | 2020-12-22 | 北京小米移动软件有限公司 | Movement control method and device of image acquisition assembly, terminal and storage medium |
| CN113865632A (en) * | 2020-06-30 | 2021-12-31 | 北京小米移动软件有限公司 | Method, device, system and medium for calibrating internal magnetic field of electronic equipment |
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| CN113865632A (en) * | 2020-06-30 | 2021-12-31 | 北京小米移动软件有限公司 | Method, device, system and medium for calibrating internal magnetic field of electronic equipment |
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