CN103841336A - Imaging equipment and shutter control method thereof - Google Patents
Imaging equipment and shutter control method thereof Download PDFInfo
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Abstract
The embodiment of the invention relates to the technical field of imaging, and discloses imaging equipment and a shutter control method thereof. The imaging equipment comprises a vibration sensing unit, an analysis unit, a calculation unit and a shutter control unit. The vibration sensing unit senses the vibration state of the imaging equipment to obtain vibration information of the imaging equipment; the analysis unit carries out spectral analysis on the vibration information to obtain the vibration cycle and phase information of main vibration in imaging equipment vibration; the calculation unit calculates the optimal exposure time point according to the vibration cycle and the phase information of main vibration; the optimal exposure time point enables the total angular displacement of main vibration to be minimum within preset exposure duration; the shutter control unit controls a shutter of the imaging equipment to be started after receiving a photographing instruction, and the difference between the shutter and the optimal exposure time point does not exceed a preset range. By means of the imaging equipment and the shutter control method thereof, influence on imaging quality can be reduced.
Description
Technical field
The present invention relates to technical field of imaging, be specifically related to a kind of imaging device and shutter control method thereof.
Background technology
When imaging device (as camera/camcorder) is loaded on non-static carrier, for example aircraft, when automobile or personnel are hand-held, all can there is vibration in various degree in carrier, affects image quality thereby fuzzy or distortion occurs the photo that causes taking.And cause the reason of this impact to be, and the optical axis of imaging device can deflect due to vibration, and in whole exposure process, there is variation (fuzzy, distortion) in the picture on transducer or egative film, thereby finally affected image quality.
In order to obtain better image quality, imaging device should be avoided vibration as far as possible, in prior art, conventionally adopts following several scheme to overcome the impact of vibration on image quality:
Scheme 1, buffer unit is being installed with the vibration on reducing from carrier transfer to imaging device between imaging device and carrier;
Scheme 2, imaging device is arranged on a platform with Active Compensation function, utilizes the motion of platform to supplement the vibration of carrier;
Scheme 3, reduce time for exposure of imaging device, thereby reduce the impact of vibration on image quality.
Vibration damping scheme of the prior art all exists larger limitation; The buffering effect of scheme 1 is limited, in the time that carrier Oscillation Amplitude is larger, is difficult to play effective effect; Scheme 2 needs extra Active Compensation platform, and its weight is large, cost is high, can not solve vibration problem completely simultaneously; After in scheme 3, the time for exposure reduces, the light intensity of taking in also can decline, if improve light intensity by increasing aperture or photosensitivity, can cause again the depth of field to diminish or the increase of imaging noise, equally affect image quality, and can not overcome the impact of vibration completely.
In sum, all there is the shortcoming that is difficult to overcome in various vibration damping schemes of the prior art, and effectiveness in vibration suppression is unsatisfactory.
Summary of the invention
Embodiment of the present invention technical problem to be solved is to provide a kind of imaging device and shutter control method thereof, the impact of the image quality for reducing vibration on imaging device.
The embodiment of the present invention provides a kind of imaging device, comprise: vibration perception unit, analytic unit, computing unit and shutter control unit, wherein, described vibration perception unit carries out perception to the vibrational state of described imaging device, obtains the vibration information of described imaging device; Described analytic unit carries out spectrum analysis to described vibration information, obtains vibration period and the phase information of the principal oscillation in described imaging device vibration, and wherein said principal oscillation comprises the vibration of amplitude maximum in described vibration; Described computing unit calculates optimum time for exposure point according to the vibration period of described principal oscillation and phase information, and wherein said optimum time for exposure point is for making the described principal oscillation time point that total angular displacement is minimum value in predetermined exposure time; Described shutter control unit is taken after instruction receiving, and the shutter of controlling described imaging device is being no more than in time of preset range and opening with the deviate of described optimum time for exposure point.
Preferably, described principal oscillation also comprises amplitude time large one or more vibrations in described vibration.
Preferably, described vibration perception unit comprises Inertial Measurement Unit.
Preferably, described vibration information comprises the vibration information of the optical axis angle of described imaging device.
Preferably, described preset range is 0 or 0.05 times of vibration period of described principal oscillation.
Accordingly, the embodiment of the present invention also provides a kind of shutter control method of imaging device, comprising:
The vibrational state of described imaging device is carried out to perception, obtain the vibration information of described imaging device;
Described vibration information is carried out to spectrum analysis, obtain vibration period and the phase information of the principal oscillation in described imaging device vibration, wherein said principal oscillation comprises the vibration of amplitude maximum in described vibration;
According to the vibration period of described principal oscillation and the optimum time for exposure point of phase information calculating, wherein said optimum time for exposure point is for making the described principal oscillation time point that total angular displacement is minimum value in predetermined exposure time;
Take after instruction receiving, the shutter of controlling described imaging device is being no more than in time of preset range and opening with the deviate of described optimum time for exposure point.
Preferably, described principal oscillation also comprises amplitude time large one or more vibrations in described vibration.
Preferably, described the vibrational state of described imaging device is carried out to perception, the vibration information that obtains described imaging device comprises:
Utilize Inertial Measurement Unit to carry out perception to the vibrational state of described imaging device, obtain the vibration information of described imaging device.
Preferably, described the vibrational state of described imaging device is carried out to perception, the vibration information that obtains described imaging device comprises:
Utilize described Inertial Measurement Unit to carry out perception to the vibrational state of described imaging device, obtain the vibration information of described imaging device optical axis angle.
Preferably, described preset range is 0 or 0.05 times of vibration period of described principal oscillation.
The imaging device providing in the embodiment of the present invention and control method thereof, by obtaining the vibration information of imaging device self, the vibration information of self is carried out spectrum analysis and is obtained the information such as vibration period and phase place of principal oscillation, make the principal oscillation optimum time for exposure point that angular displacement is minimum value in predetermined exposure duration thereby can calculate, imaging device is receiving after the shooting instruction of user's input, do not open immediately shutter, but open shutter near above-mentioned optimum time for exposure point, can make in exposure time the Oscillation Amplitude of imaging device less, thereby improve the image quality of imaging device.Therefore the imaging device that the present embodiment provides can significantly reduce the impact of vibration on image quality, and has the advantages such as cost is low, volume is little, lightweight, applied widely, has overcome the limitation of various schemes in prior art.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of imaging device of providing of the embodiment of the present invention;
Fig. 2 is the waveform schematic diagram of angular displacement and angular speed in the embodiment of the present invention;
Fig. 3 is the schematic flow sheet of the shutter control method of a kind of imaging device of providing of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
A kind of imaging device and shutter control method thereof in the embodiment of the present invention, are provided, for reducing the impact of the image quality of vibration on imaging device.Below be elaborated respectively.
Embodiment mono-:
The embodiment of the present invention provides a kind of imaging device, and as shown in Figure 1, this imaging device can comprise: vibration perception unit 101, analytic unit 102, computing unit 103 and shutter control unit 104, wherein,
The imaging device that the present embodiment provides can obtain the vibration information of self, the vibration information of self is carried out spectrum analysis and is obtained the information such as vibration period and phase place of principal oscillation, make the principal oscillation optimum time for exposure point that angular displacement is minimum value in predetermined exposure duration thereby can calculate, imaging device is receiving after the shooting instruction of user's input, can not open immediately shutter, but open shutter near above-mentioned optimum time for exposure point, can make in exposure time the Oscillation Amplitude of imaging device less, thereby improve the image quality of imaging device.
The imaging device that the present embodiment provides can significantly reduce the impact of vibration on image quality, and has the advantages such as cost is low, volume is little, lightweight, overcomes the limitation of various schemes in prior art.
For instance, above-mentioned vibration perception unit 101 can comprise Inertial Measurement Unit (IMU, Inertial measurement unit), and IMU can be rigidly connected with the main body of imaging device (as housing), or be fixedly installed in the inside of imaging device, to gather the vibration information of imaging device.
For instance, typical IMU can comprise the accelerometer of three single shafts and the gyroscope of three single shafts, accelerometer can detect the acceleration signal of imaging device at independent three axles of coordinate system, and gyroscope can detect the angular velocity signal of imaging device with respect to navigation coordinate system, obtain the information such as angular speed and acceleration of imaging device in three dimensions, the concrete grammar that utilizes IMU to gather vibration information belongs to prior art, does not repeat them here.
Certainly vibration perception unit 101 also can perception and be output into the cell formation of picture vibration equipment information by other, does not do concrete restriction at this.
For instance, the deflection situation of the optical axis of imaging device due to what image quality was caused to direct impact, the vibration information that above-mentioned vibration perception unit 101 provides can be the vibration information of the optical axis angle of imaging device, and imaging device other parts or the vibration information of other form and the vibration information of above-mentioned optical axis angle are of equal value certainly.
Spectrum analysis is to utilize the method for Fourier transform to decompose the signal of vibration, and presses frequency order and launch, and obtains the signal analysis method of its amplitude spectrum and phase spectrum, and its concrete operation principle belongs to prior art, does not repeat them here.
Generally speaking, in the time taking, exposure time T0 is user's pre-set (for example 0.01 second etc.), makes the optical axis amount of deflection minimum of imaging device in predetermined exposure duration T0, is in fact to make the total angular displacement minimum of predetermined exposure duration T0 internal vibration.
The vibration that only comprises amplitude maximum take above-mentioned principal oscillation is example, suppose that this principal oscillation is simple harmonic vibration, its vibration displacement formula can be: x (t)=Asin (2 π f*t), corresponding angular displacement formula can be: wherein, x (t) represents vibration displacement to θ (t)=π sin (2 π f*t), and θ (t) represents angular displacement, A represents amplitude, f represents frequency, its cycle T=1/f, and the angular speed of this vibration is: ω (t)=2 π
2f sin (2 π f*t+ pi/2), its angular displacement waveform (solid line) and angular speed waveform (dotted line) as shown in Figure 2, as can be seen from Figure 2, have differed pi/2 in phase place between angular speed and angular displacement.
In predetermined exposure time T0, total angular displacement of principal oscillation is
wherein t1 represents the starting point moment of exposure time T0, t2 represents the finish time of exposure time T0, known according to the rule of simple harmonic vibration, approach at 0 o'clock at angular speed, its angular displacement within the unit interval also can tend to minimum value, if comprise in exposure time T0 that angular speed is 0 moment, can make total angular displacement trend minimum, now
suppose to determine that according to the cycle of principal oscillation and phase information t3 moment angular velocity of vibration equals 0, the t1 moment (optimum time for exposure point) that makes the interior total angular displacement of exposure time T0 reach minimum value is t1=t3-T0/2, accordingly, t2=t3+T0/2, be the zero hour of the t1 the and when finish time, t2 was symmetrical with respect to the t3 moment of exposure time, total angular displacement of the principal oscillation in exposure time T0 can reach minimum value.
In the present embodiment, the exposure t1(shutter zero hour can be opened to the moment) be limited to optimum time for exposure in point this moment of t3-T0/2 and obtain the image of image quality the best, now the preset range of above-mentioned deviate is 0.Consider from another point of view, if exposure t1(zero hour shutter is opened to the moment) be accurately limited to optimum time for exposure in point this moment of t3-T0/2, although can make the total angular displacement of principal oscillation reach minimum value, obtain the best image of image quality, but the requirement to imaging device in control precision may be very high, can make the cost of imaging device higher, consideration from cost-saving, also the exposure t1 zero hour can be limited within the scope of near t3-T0/2, for imaging device, the requirement meeting in control precision is relatively low like this, but still can obtain the good image quality of quality.
Accordingly, be that shutter control unit 104 can be controlled at by exposing [t3-T0/2-Δ t the zero hour, t3-T0/2+ Δ t] in scope, Δ t is the preset range of the deviate that can tolerate, can carry out suitable setting by those skilled in the art, be set to 0.05 times of vibration period T of principal oscillation such as but not limited to Δ t, be Δ t=0.05T, the occurrence of Δ t can according to requirement and the cost control etc. of image quality for example, because usually carrying out suitable setting (0.01T), its occurrence is not limited at this.
Preferably, the imaging device that also the present embodiment can be provided and vibration damping scheme of the prior art are combined with, thereby play better effectiveness in vibration suppression.
Embodiment bis-:
The embodiment of the present invention also provides a kind of shutter control method of imaging device, and as shown in Figure 3, the method can comprise:
301, the vibrational state of above-mentioned imaging device is carried out to perception, obtain the vibration information of above-mentioned imaging device.
For instance, can utilize Inertial Measurement Unit IMU to carry out perception to the vibrational state of above-mentioned imaging device, to obtain the vibration information of above-mentioned imaging device.
The vibration information that Inertial Measurement Unit obtains can comprise the vibration information of imaging device optical axis angle.
302, above-mentioned vibration information is carried out to spectrum analysis, obtain vibration period and the phase information of the principal oscillation in above-mentioned imaging device vibration, wherein above-mentioned principal oscillation comprises the vibration of amplitude maximum in above-mentioned vibration;
For instance, spectrum analysis can be carried out by the processor of imaging device, and the method for concrete spectrum analysis belongs to prior art, does not repeat them here.
303, calculate optimum time for exposure point according to the vibration period of above-mentioned principal oscillation and phase information; Above-mentioned optimum time for exposure point is for making the above-mentioned principal oscillation time point that total angular displacement is minimum value in predetermined exposure time.
For instance, the calculating of optimum time for exposure point also can be carried out by the processor of imaging device.
304, take after instruction receiving, the shutter of controlling above-mentioned imaging device is being no more than in time of preset range and opening with the deviate of above-mentioned optimum time for exposure point.
The shutter control method of the imaging device that the present embodiment provides, can obtain the vibration information of imaging device self, vibration information is carried out spectrum analysis and is obtained vibration period and the phase information of principal oscillation, make the principal oscillation optimum time for exposure point that angular displacement is minimum value in predetermined exposure duration thereby can calculate, receiving after the shooting instruction of user's input, can not open immediately shutter, but open shutter near above-mentioned optimum time for exposure point, can make in exposure time the Oscillation Amplitude of imaging device less, thereby improve the image quality of imaging device.
The shutter control method of the imaging device that the present embodiment provides can significantly reduce the impact of vibration on image quality, and has the advantages such as cost is low, applied widely, overcomes the limitation of various schemes in prior art.
Spectrum analysis can be decomposed into the vibration of imaging device the stack of multiple different vibrations, obviously in above-mentioned multiple different vibrations, the vibration of amplitude maximum has the greatest impact to imaging device, therefore, preferably, above-mentioned principal oscillation can comprise the vibration of amplitude maximum in above-mentioned multiple different vibrations; In order to improve further image quality, above-mentioned principal oscillation can also comprise amplitude time large one or more vibrations in above-mentioned multiple different vibrations, and now, principal oscillation can be the vibration of amplitude maximum and the stack of the inferior large one or more vibrations of amplitude.
Particularly, above-mentioned 303 can comprise:
Determine according to the cycle of principal oscillation and phase information principal oscillation angular speed be 0 moment t3.
Preferably, t3 can be that distance receives a shooting nearest moment that angular speed is 0 of instruction.
Determine that by above-mentioned t3 above-mentioned optimum time for exposure point is t3-T0/2, wherein, T0 represents predetermined exposure time.
In the present embodiment, the exposure t1(shutter zero hour can be opened to the moment) be limited to optimum time for exposure in point this moment of t3-T0/2 and obtain the image of image quality the best, now the preset range of above-mentioned deviate is 0.Consider from another point of view, if exposure t1(zero hour shutter is opened to the moment) be accurately limited to optimum time for exposure in point this moment of t3-T0/2, although can make the total angular displacement of principal oscillation reach minimum value, obtain the best image of image quality, but the requirement to imaging device in control precision may be very high, can make the cost of imaging device higher, consideration from cost-saving, also the exposure t1 zero hour can be limited within the scope of near t3-T0/2, for imaging device, the requirement meeting in control precision is relatively low like this, but still can obtain the good image quality of quality.
Accordingly, be the exposure t1 zero hour can be controlled to [t3-T0/2-Δ t, t3-T0/2+ Δ t] in scope, Δ t is the preset range of the deviate that can tolerate, can carry out suitable setting by those skilled in the art, be set to 0.05 times of vibration period T of principal oscillation such as but not limited to Δ t, i.e. Δ t=0.05T, the occurrence of Δ t can according to requirement and the cost control etc. of image quality because usually carrying out suitable setting, its occurrence is not limited at this.
Preferably, the control method of the imaging device that also the present embodiment can be provided and vibration damping scheme of the prior art are combined with, thereby play better effectiveness in vibration suppression.
It should be noted that, above each embodiment all belongs to same inventive concept, and the description of each embodiment emphasizes particularly on different fields, and in indivedual embodiment, describes not detailed part, can be with reference to the description in other embodiment.
Term in specification of the present invention and claims and above-mentioned accompanying drawing " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, for example, those steps or unit that process, method, system, product or the equipment that has comprised series of steps or unit is not necessarily limited to clearly list, but can comprise clearly do not list or for these processes, method, product or equipment intrinsic other step or unit.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is can carry out the hardware that instruction is relevant by program to complete, this program can be stored in a computer-readable recording medium, storage medium can comprise: flash disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access Memory, RAM), disk or CD etc.
The imaging device and the shutter control method thereof that above the embodiment of the present invention are provided are described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. an imaging device, is characterized in that, comprising: vibration perception unit, analytic unit, computing unit and shutter control unit, wherein,
Described vibration perception unit carries out perception to the vibrational state of described imaging device, obtains the vibration information of described imaging device;
Described analytic unit carries out spectrum analysis to described vibration information, obtains vibration period and the phase information of the principal oscillation in described imaging device vibration, and wherein said principal oscillation comprises the vibration of amplitude maximum in described vibration;
Described computing unit calculates optimum time for exposure point according to the vibration period of described principal oscillation and phase information, and wherein said optimum time for exposure point is for making the described principal oscillation time point that total angular displacement is minimum value in predetermined exposure time;
Described shutter control unit is taken after instruction receiving, and the shutter of controlling described imaging device is being no more than in time of preset range and opening with the deviate of described optimum time for exposure point.
2. imaging device according to claim 1, is characterized in that, described principal oscillation also comprises amplitude time large one or more vibrations in described vibration.
3. imaging device according to claim 1, is characterized in that, described vibration perception unit comprises Inertial Measurement Unit.
4. imaging device according to claim 3, is characterized in that, described vibration information comprises the vibration information of the optical axis angle of described imaging device.
5. according to the imaging device described in claim 1-4 any one, it is characterized in that, described preset range is 0 or 0.05 times of vibration period of described principal oscillation.
6. a shutter control method for imaging device, is characterized in that, comprising:
The vibrational state of described imaging device is carried out to perception, obtain the vibration information of described imaging device;
Described vibration information is carried out to spectrum analysis, obtain vibration period and the phase information of the principal oscillation in described imaging device vibration, wherein said principal oscillation comprises the vibration of amplitude maximum in described vibration;
According to the vibration period of described principal oscillation and the optimum time for exposure point of phase information calculating, wherein said optimum time for exposure point is for making the described principal oscillation time point that total angular displacement is minimum value in predetermined exposure time;
Take after instruction receiving, the shutter of controlling described imaging device is being no more than in time of preset range and opening with the deviate of described optimum time for exposure point.
7. require the method described in 6 according to claim, it is characterized in that, described principal oscillation also comprises amplitude time large one or more vibrations in described vibration.
8. method according to claim 6, is characterized in that, described the vibrational state of described imaging device is carried out to perception, and the vibration information that obtains described imaging device comprises:
Utilize Inertial Measurement Unit to carry out perception to the vibrational state of described imaging device, obtain the vibration information of described imaging device.
9. method according to claim 8, is characterized in that, described the vibrational state of described imaging device is carried out to perception, and the vibration information that obtains described imaging device comprises:
Utilize described Inertial Measurement Unit to carry out perception to the vibrational state of described imaging device, obtain the vibration information of described imaging device optical axis angle.
10. according to the method described in claim 6-9 any one, it is characterized in that, described preset range is 0 or 0.05 times of vibration period of described principal oscillation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104506779A (en) * | 2014-12-24 | 2015-04-08 | 浙江宇视科技有限公司 | Traffic lamp color correcting method and image pickup equipment |
| CN107315340A (en) * | 2017-05-27 | 2017-11-03 | 中国科学院上海技术物理研究所 | It is a kind of that the steady as device and control method of feedback is measured based on micro electromechanical IMU |
| CN109076157A (en) * | 2017-12-26 | 2018-12-21 | 深圳市大疆创新科技有限公司 | Image processing method, device and machine readable storage medium |
| CN114449164A (en) * | 2021-12-27 | 2022-05-06 | 广州极飞科技股份有限公司 | Photographing method and device, unmanned equipment and storage medium |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4419466B2 (en) * | 2003-07-25 | 2010-02-24 | 株式会社ニコン | Photography lens and camera system |
| JP5031690B2 (en) * | 2008-07-15 | 2012-09-19 | キヤノン株式会社 | Anti-vibration control device, imaging device, and control method for image stabilization control device |
| JP5621569B2 (en) * | 2010-12-13 | 2014-11-12 | ソニー株式会社 | Imaging apparatus and shutter operation correction method |
| JP5249377B2 (en) * | 2011-03-22 | 2013-07-31 | キヤノン株式会社 | Imaging apparatus, control method therefor, and program |
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- 2014-03-28 CN CN201410123290.9A patent/CN103841336B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506779A (en) * | 2014-12-24 | 2015-04-08 | 浙江宇视科技有限公司 | Traffic lamp color correcting method and image pickup equipment |
| CN107315340A (en) * | 2017-05-27 | 2017-11-03 | 中国科学院上海技术物理研究所 | It is a kind of that the steady as device and control method of feedback is measured based on micro electromechanical IMU |
| CN109076157A (en) * | 2017-12-26 | 2018-12-21 | 深圳市大疆创新科技有限公司 | Image processing method, device and machine readable storage medium |
| WO2019127005A1 (en) * | 2017-12-26 | 2019-07-04 | 深圳市大疆创新科技有限公司 | Image processing method and device, and machine readable storage medium |
| CN109076157B (en) * | 2017-12-26 | 2021-05-11 | 深圳市大疆创新科技有限公司 | Image processing method, apparatus and machine-readable storage medium |
| CN114449164A (en) * | 2021-12-27 | 2022-05-06 | 广州极飞科技股份有限公司 | Photographing method and device, unmanned equipment and storage medium |
| CN114449164B (en) * | 2021-12-27 | 2023-07-18 | 广州极飞科技股份有限公司 | Photographing method and device, unmanned equipment and storage medium |
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