CN105472248B

CN105472248B - Focus method and picture pick-up device based on photographed scene

Info

Publication number: CN105472248B
Application number: CN201510983231.3A
Authority: CN
Inventors: 林铁楠
Original assignee: Beijing Qihoo Technology Co Ltd; Qizhi Software Beijing Co Ltd
Current assignee: Chengdu Panorama Intelligent Technology Co ltd
Priority date: 2015-12-24
Filing date: 2015-12-24
Publication date: 2019-05-10
Anticipated expiration: 2035-12-24
Also published as: CN105472248A

Abstract

The embodiment of the invention provides focus methods and picture pick-up device based on photographed scene, which comprises the acquisition parameters for the image data of acquisition, when determining the characteristic value of the image data and/or obtaining the image data；From preset multiple photographed scenes, the photographed scene to match with the characteristic value of described image data and/or the acquisition parameters is determined；Determine preset focusing mode corresponding with the photographed scene to match；It is focused according to the focusing mode determined, for shooting.It is focused using preset focusing mode is corresponded in the embodiment of the present invention for photographed scene, it is focused compared to using same focusing mode, it is more applicable for the photographed scene, so that focusing highly efficient, smooth, empty burnt or dead burnt phenomenon can be prevented, so that imaging is more clear, user experience can be promoted.

Description

Focus method and picture pick-up device based on photographed scene

Technical field

The present invention relates to field of camera technology, specifically, the present invention relates to a kind of focus methods based on photographed scene And picture pick-up device.

Background technique

With the development of science and technology and social progress, the intelligent terminals such as smart phone, tablet computer with call function It is widely available；Intelligent video camera head also starts to popularize.

Intelligent video camera head be generally arranged in user family or the places such as office in, be used for security monitor.Intelligent camera The data acquisition and transmission method of head generally includes: the place near this intelligent video camera head setting position shot, depending on Frequency evidence or picture data；Video data or picture data are uploaded to cloud server by network, by cloud service The video data received or picture data are forwarded to intelligent terminal by device.The video that user can show according to intelligent terminal Or image, where monitoring intelligent video camera head the case where place.

However, it was found by the inventors of the present invention that intelligent video camera head is easy to appear empty Jiao Xianxiang, the photo that causes shooting to obtain Or video be all it is fuzzy, without focus；Alternatively, intelligent video camera head is easy to appear dead burnt phenomenon, such as the photograph shot Perhaps video always is and fuzzy can not take clear photograph or video piece.In short, utilizing existing intelligent camera Head focus method is easy to appear the phenomenon of empty burnt or dead coke, leads to the photo taken or video blur.

Summary of the invention

The present invention is directed to the shortcomings that existing type of focusing, proposes that a kind of focus method based on photographed scene and camera shooting are set It is standby, empty burnt or dead coke is easy to appear to solve the problems, such as that the prior art exists.

The embodiment of the present invention provides a kind of focus method based on photographed scene according on one side, comprising:

Bat for the image data of acquisition, when determining the characteristic value of the image data and/or obtaining the image data Take the photograph parameter；

From preset multiple photographed scenes, determine and the characteristic value of described image data and/or the acquisition parameters The photographed scene to match；

Determine preset focusing mode corresponding with the photographed scene to match；

It is focused according to the focusing mode determined, for shooting.

Preferably, the characteristic value for determining the image data and/or acquisition parameters when obtaining the image data, packet It includes:

Determine sensitivity yield value when obtaining the image data；And

The photographed scene for determining to match with the characteristic value of described image data and/or the acquisition parameters, packet It includes:

If it is determined that the sensitivity yield value is higher than preset gain threshold, it is determined that go out described in low-illumination scene conduct The photographed scene to match；And

It is described to determine preset focusing mode corresponding with the photographed scene to match, comprising:

Determine preset first focusing algorithm corresponding with low-illumination scene；And

The focusing mode that the basis is determined is focused, comprising:

The focus motor in this picture pick-up device is controlled according to the first focusing algorithm to be focused.

It focus motor in this picture pick-up device is controlled according to the first focusing algorithm is focused preferably, described, comprising:

According to the first focusing algorithm, periodically controls the focus motor and carry out top gear stepping movement and determine stepping The corresponding maximum focus features value in position；

Wherein, the top gear stepping movement is carried out in the monocycle and determines the process of the maximum focus features value, Include:

After the step pitch of the mobile default of top gear, the corresponding present convergence characteristic value of current stepping position is determined；

Judge whether the present convergence characteristic value is less than the corresponding previous focus features value of previous stepping position；If It is no, then using the present convergence characteristic value as the previous focus features value after, carry out next period top gear stepping move It is dynamic；If so, using the previous focus features value as maximum focus features value, and control the focus motor navigate to it is described Terminate to focus after previous stepping position.

Determine that frequency is higher than the number of the characteristic component of assigned frequency in the focus features value of the image data；And

If it is determined that the number of the characteristic component is lower than preset characteristic component quantity threshold, it is determined that go out simple scenario As the photographed scene to match；And

Determine preset second focusing algorithm corresponding with simple scenario；And

The focusing mode that the basis is determined is focused, comprising:

The focus motor in this picture pick-up device is controlled according to the second focusing algorithm to be focused.

It focus motor in this picture pick-up device is controlled according to the second focusing algorithm is focused preferably, described, comprising:

According to the second focusing algorithm, periodically controls the focus motor and carry out low or first gear stepping movement and determine stepping The corresponding maximum focus features value in position；

Wherein, the low or first gear stepping movement is carried out in the monocycle and determines the process of the maximum focus features value, Include:

After the step pitch of the mobile default of low or first gear, the corresponding present convergence characteristic value of current stepping position is determined；

Judge whether the present convergence characteristic value is less than the corresponding previous focus features value of previous stepping position；If It is no, then using the present convergence characteristic value as the previous focus features value after, carry out next period low or first gear stepping move It is dynamic；If so, using the previous focus features value as maximum focus features value, and control the focus motor navigate to it is described Terminate to focus after previous stepping position.

Determine the focus features value of the image data；And

If it is determined that the focus features value is higher than preset focus features upper limit threshold, it is determined that go out point light source scene and make For the photographed scene to match；And

Determine preset tertiary focusing algorithm corresponding with point light source scene；And

The focusing mode that the basis is determined is focused, comprising:

The focus motor in this picture pick-up device is controlled according to tertiary focusing algorithm to be focused.

It focus motor in this picture pick-up device is controlled according to tertiary focusing algorithm is focused preferably, described, comprising:

According to tertiary focusing algorithm, periodically controls the focus motor and carry out stepping movement and determine stepping position pair The maximum negative focusing characteristic value answered；

Wherein, the stepping movement is carried out in the monocycle and determines the process of the maximum negative focusing characteristic value, comprising:

After the step pitch of a mobile default, the corresponding present convergence characteristic value of current stepping position is determined；Work as to described After prefocusing characteristic value negates, current negative focusing characteristic value is obtained；

Judge whether the current negative focusing characteristic value is less than the corresponding previous negative focusing characteristic value of previous stepping position； If it is not, then using the current negative focusing characteristic value as the previous negative focusing characteristic value after, carry out next period stepping move It is dynamic；If so, using the previous negative focusing characteristic value as maximum negative focusing characteristic value, and control the focus motor and navigate to Terminate to focus after the previous stepping position.

Determine the step value of zoom motor when obtaining the image data；And

If determining that this picture pick-up device is in focal length end according to the step value of the zoom motor, it is determined that go out focal length field The photographed scene that scape matches as described in；And

Determine preset 4th focusing algorithm corresponding with focal length scene；And

The focusing mode that the basis is determined is focused, comprising:

The focus motor in this picture pick-up device is controlled according to the 4th focusing algorithm to be focused.

It focus motor in this picture pick-up device is controlled according to the 4th focusing algorithm is focused preferably, described, comprising:

According to the 4th focusing algorithm, the step value and preset step pitch table of the zoom motor, the focusing is determined Effective stepping range of motor；

It controls after the focus motor navigates to the starting stepping position of effective stepping range, with preset long step pitch The stepping for carrying out top gear is mobile, and determines the growth rate of the adjacent corresponding focus features value of long stepping position；It is described Long step pitch is greater than the step pitch of default；

When the growth rate for determining the focus features value is greater than preset focus features value growth rate threshold value, periodically Controlling the focus motor carries out the stepping movement of low or first gear with the step pitch defaulted, and it is corresponding maximum poly- to calculate stepping position Burnt characteristic value；Wherein, the low or first gear stepping movement is carried out in the monocycle and determines the process of the maximum focus features value, Include:

The embodiment of the present invention additionally provides a kind of picture pick-up device according on the other hand, comprising:

Characteristic value and parameter determination module determine the characteristic value of the image data for the image data for acquisition And/or acquisition parameters when obtaining the image data；

Photographed scene matching module, for determining the spy with described image data from preset multiple photographed scenes The photographed scene that value indicative and/or the acquisition parameters match；

Focusing mode determining module, for determining preset focusing mode corresponding with the photographed scene to match；

Focus module, for being focused according to the focusing mode determined, for shooting.

Preferably, the characteristic value and parameter determination module are specifically used for determining sensitivity when obtaining the image data Yield value；

The photographed scene matching module is specifically used for if it is determined that the sensitivity yield value is higher than preset gain threshold Value, it is determined that go out the photographed scene that low-illumination scene matches as described in；

The focusing mode determining module is specifically used for determining preset first focusing algorithm corresponding with low-illumination scene；

The focus module is gathered specifically for controlling the focus motor in this picture pick-up device according to the first focusing algorithm It is burnt.

Preferably, the focus module is specifically used for according to the first focusing algorithm, periodically control the focus motor into The stepping of row top gear is mobile and determines the corresponding maximum focus features value of stepping position；Wherein, the height is carried out in the monocycle Fast shelves stepping is mobile and determines the process of the maximum focus features value, comprising: with the step pitch of the mobile default of top gear Afterwards, the corresponding present convergence characteristic value of current stepping position is determined；It is previous to judge whether the present convergence characteristic value is less than The corresponding previous focus features value of a stepping position；If it is not, then special using the present convergence characteristic value as the previous focusing After value indicative, the top gear stepping for carrying out next period is mobile；If so, being focused using the previous focus features value as maximum special Value indicative, and control end after the focus motor navigates to the previous stepping position and focus.

Preferably, the characteristic value and parameter determination module are specifically used in the focus features value for determining the image data Frequency is higher than the number of the characteristic component of assigned frequency；

The photographed scene matching module is specifically used for if it is determined that the number of the characteristic component is lower than preset feature Component quantity threshold, it is determined that go out the photographed scene that simple scenario matches as described in；

The focusing mode determining module is specifically used for determining preset second focusing algorithm corresponding with simple scenario；

The focus module is gathered specifically for controlling the focus motor in this picture pick-up device according to the second focusing algorithm It is burnt.

Preferably, the focus module is specifically used for according to the second focusing algorithm, periodically control the focus motor into The stepping of row low or first gear is mobile and determines the corresponding maximum focus features value of stepping position；Wherein, it is carried out in the monocycle described low Fast shelves stepping is mobile and determines the process of the maximum focus features value, comprising: with the step pitch of the mobile default of low or first gear Afterwards, the corresponding present convergence characteristic value of current stepping position is determined；It is previous to judge whether the present convergence characteristic value is less than The corresponding previous focus features value of a stepping position；If it is not, then special using the present convergence characteristic value as the previous focusing After value indicative, the low or first gear stepping for carrying out next period is mobile；If so, being focused using the previous focus features value as maximum special Value indicative, and control end after the focus motor navigates to the previous stepping position and focus.

Preferably, the characteristic value and parameter determination module are specifically used for determining the focus features value of the image data；

The photographed scene matching module is specifically used for if it is determined that the focus features value is higher than preset focus features Upper limit threshold, it is determined that go out the photographed scene that point light source scene matches as described in；

The focusing mode determining module is specifically used for determining preset tertiary focusing algorithm corresponding with point light source scene；

The focus module is gathered specifically for controlling the focus motor in this picture pick-up device according to tertiary focusing algorithm It is burnt.

Preferably, the focus module is specifically used for according to tertiary focusing algorithm, periodically control the focus motor into Row stepping is mobile and determines the corresponding maximum negative focusing characteristic value of stepping position；Wherein, the stepping shifting is carried out in the monocycle Move and determine the process of the maximum negative focusing characteristic value, comprising: after the step pitch of a mobile default, determine current stepping The corresponding present convergence characteristic value in position；After negating to the present convergence characteristic value, current negative focusing characteristic value is obtained；Judgement Whether the current negative focusing characteristic value is less than the corresponding previous negative focusing characteristic value of previous stepping position；If it is not, then by institute After current negative focusing characteristic value is stated as the previous negative focusing characteristic value, the stepping for carrying out next period is mobile；If so, will The previous negative focusing characteristic value controls the focus motor and navigates to the previous step as maximum negative focusing characteristic value Carry postpones end and focuses.

Preferably, the characteristic value and parameter determination module are specifically used for determining zoom electricity when obtaining the image data The step value of machine；

If the photographed scene matching module is specifically used for the step value according to the zoom motor, determine that this camera shooting is set It is standby to be in focal length end, it is determined that go out the photographed scene that focal length scene matches as described in；

The focusing mode determining module is specifically used for determining preset 4th focusing algorithm corresponding with focal length scene；

The focus module is gathered specifically for controlling the focus motor in this picture pick-up device according to the 4th focusing algorithm It is burnt.

Preferably, the focus module is specifically used for the step value according to the 4th focusing algorithm, the zoom motor, and Preset step pitch table determines effective stepping range of the focus motor；Control the focus motor navigate to it is described effectively It is mobile with the stepping that preset long step pitch carries out top gear after the starting stepping position of stepping range, and determine adjacent long step Carry sets the growth rate of corresponding focus features value；The long step pitch is greater than the step pitch of default；When determining the focusing When the growth rate of characteristic value is greater than preset focus features value growth rate threshold value, periodically control the focus motor to default The stepping that step pitch carries out low or first gear is mobile, and calculates the corresponding maximum focus features value of stepping position；Wherein, in the monocycle into The row low or first gear stepping is mobile and determines the process of the maximum focus features value, comprising: silent with low or first gear mobile one After the step pitch recognized, the corresponding present convergence characteristic value of current stepping position is determined；Whether judge the present convergence characteristic value Previous focus features value corresponding less than previous stepping position；If it is not, then using the present convergence characteristic value as before described After secondary focus features value, the low or first gear stepping for carrying out next period is mobile；If so, using the previous focus features value as most Big focus features value, and control end after the focus motor navigates to the previous stepping position and focus.

In technical solution of the present invention, before picture pick-up device shooting, image data is obtained；Determine the image data Characteristic value and/or acquisition parameters when obtaining the image data；From preset multiple photographed scenes, determine and image data Characteristic value and/or the photographed scene that matches of acquisition parameters；Determine preset focusing corresponding with the photographed scene to match Mode；It is focused according to the focusing mode determined.It is utilized as photographed scene and corresponds to preset focusing mode being focused, phase Than being focused in using same focusing mode, be more applicable for the photographed scene so that focus it is highly efficient, smooth, can be with User experience can be promoted so that imaging is more clear by preventing empty burnt or dead burnt phenomenon.

The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description Obviously, or practice through the invention is recognized.

Detailed description of the invention

Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments Obviously and it is readily appreciated that, in which:

Fig. 1 is the flow diagram of the focus method based on low-illumination scene of the embodiment of the present invention one；

Fig. 2 is the flow diagram of the focus method based on simple scenario of the embodiment of the present invention two；

Fig. 3 is the flow diagram of the focus method based on point light source scene of the embodiment of the present invention three；

Fig. 4 is the flow diagram of the focus method based on focal length scene of the embodiment of the present invention four；

Fig. 5 is the block schematic illustration of the picture pick-up device internal structure of the embodiment of the present invention six.

Specific embodiment

The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.

Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or wirelessly coupling.It is used herein to arrange Diction "and/or" includes one or more associated wholes for listing item or any cell and all combinations.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art The consistent meaning of meaning, and unless idealization or meaning too formal otherwise will not be used by specific definitions as here To explain.

Those skilled in the art of the present technique are appreciated that " terminal " used herein above, " terminal device " both include wireless communication The equipment of number receiver, only has the equipment of the wireless signal receiver of non-emissive ability, and including receiving and emitting hardware Equipment, have on bidirectional communication link, can carry out two-way communication reception and emit hardware equipment.This equipment It may include: honeycomb or other communication equipments, shown with single line display or multi-line display or without multi-line The honeycomb of device or other communication equipments；PCS (Personal Communications Service, PCS Personal Communications System), can With combine voice, data processing, fax and/or communication ability；PDA (Personal Digital Assistant, it is personal Digital assistants), it may include radio frequency receiver, pager, the Internet/intranet access, web browser, notepad, day It goes through and/or GPS (Global Positioning System, global positioning system) receiver；Conventional laptop and/or palm Type computer or other equipment, have and/or the conventional laptop including radio frequency receiver and/or palmtop computer or its His equipment." terminal " used herein above, " terminal device " can be it is portable, can transport, be mounted on the vehicles (aviation, Sea-freight and/or land) in, or be suitable for and/or be configured in local runtime, and/or with distribution form, operate in the earth And/or any other position operation in space." terminal " used herein above, " terminal device " can also be communication terminal, on Network termination, music/video playback terminal, such as can be PDA, MID (Mobile Internet Device, mobile Internet Equipment) and/or mobile phone with music/video playing function, it is also possible to the equipment such as smart television, set-top box.

The present inventor is it is considered that for intelligent video camera head, have the smart phone or tablet computer of camera Equal picture pick-up devices.Before picture pick-up device shooting, image data is obtained；Determine the characteristic value and/or acquisition of the image data The acquisition parameters when image data；From preset multiple photographed scenes, the characteristic value and/or bat with image data are determined Take the photograph the photographed scene that parameter matches；Determine preset focusing mode corresponding with the photographed scene to match；According to determining Focusing mode be focused, for shooting.Due to corresponding to preset focusing mode for each photographed scene, each shooting field is compared The shared same focusing mode of scape is more applicable for the photographed scene, therefore is assembled using more applicable focusing mode, It can to focus more effective, smooth, empty burnt or dead burnt phenomenon can be prevented, so that imaging is more clear, Ke Yiti Rise user experience.

Technical solution of the present invention is specifically introduced with reference to the accompanying drawing.

Multiple photographed scenes are provided in technical solution of the present invention, in picture pick-up device；Each photographed scene is respectively arranged with Corresponding focusing mode.Focusing mode is specifically as follows focusing algorithm.Photographed scene and the particular content of focusing algorithm will It is discussed in detail subsequent, details are not described herein again.

In technical solution of the present invention, the characteristic value for the image data that picture pick-up device obtains can include at least following parameter One of: focus features value, the number of all characteristic components of the focus features value of composition image data of image data.

Acquisition parameters when picture pick-up device obtains image data can include at least one of following parameter: sensitivity gain The step value of value, zoom motor.

The focus method based on photographed scene proposed in technical solution of the present invention, comprising: picture pick-up device is for obtaining Image data, acquisition parameters when determining the characteristic value of the image data and/or obtaining the image data；From preset more In a photographed scene, the photographed scene to match with the characteristic value of image data and/or acquisition parameters is determined；It determines and phase Matched photographed scene corresponds to preset focusing mode；It is focused according to the focusing mode determined, for shooting.

Lower mask body introduces the embodiment of the present invention one to six.

Embodiment one

The flow diagram of the focus method based on low-illumination scene of the embodiment of the present invention one is as shown in Figure 1, include such as Lower step:

S101: picture pick-up device determines sensitivity yield value when obtaining the image data for the image data of acquisition.

Specifically, picture pick-up device passes through its sensor devices, such as CCD (Charge Coupled before shooting Device, charge coupled cell) or CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxygen Compound semiconductor) device etc., convert optical signals to analog electrical signal；Analog electrical signal is digitized by analog-to-digital conversion Image data, such as data in RAW formatted file.It include the data of multiple pixels in image data.

Picture pick-up device can determine obtain image data when sensitivity ISO, and then determine for the sensitivity into The yield value of row gain.Preferably, picture pick-up device can use AGC (Automatic Gain Control, automatic gain control System) carry out gain.

Image data is transformed into frequency domain by picture pick-up device, obtains multiple frequecy characteristics point of each pixel of the image data Amount；According to preset high pass filter, the more of each pixel are extracted from each frequecy characteristic component of each pixel of image data A high-frequency characteristic component；According to multiple high-frequency characteristic components of each pixel, the focus features value of the image data is determined.

Preferably, picture pick-up device is according to the high-frequency characteristic component of the pixel column of image data and the high-frequency characteristic point of pixel column Amount, determines the focus features value of the image data, such as focus_value.

For example, picture pick-up device calculates the focus features value focus_value of image data by following formula:

(formula 1)

X, y respectively indicate pixel column coordinate (or sequence) in image data, pixel column coordinate (or sequence in above-mentioned formula 1 Column), hpf_o (x, y) indicates the statistical result of the same frequency characteristic component of pixel column and pixel column.

S102: picture pick-up device is if it is determined that sensitivity yield value is higher than preset gain threshold, then from preset multiple bats It takes the photograph in scene and determines low-illumination scene as the photographed scene to match.

Specifically, low-illumination scene is higher with sensitivity yield value in preset multiple photographed scenes, it is preset to be higher than The characteristics of gain threshold.

Picture pick-up device is if it is determined that sensitivity yield value is higher than preset gain threshold, then from preset multiple photographed scenes In determine low-illumination scene as the photographed scene to match.

If increasing photosensitive it will be understood by those skilled in the art that picture pick-up device unlimitedly carries out gain to sensitivity Yield value is spent, a large amount of noise can be introduced, the focus features value of image data is caused to sharply increase, carrys out bad shadow to focal zone It rings.Therefore, in the embodiment of the present invention one, the upper limit, such as upper gain limit value are provided with to sensitivity yield value, so that can both mention The brightness of image is risen, and excessive noise will not be introduced.Moreover, the gain threshold in this step is less than upper gain limit value.

S103: picture pick-up device determines preset first focusing algorithm corresponding with low-illumination scene.

Specifically, picture pick-up device is determined and low-light (level) field from the photographed scene and focusing algorithm being correspondingly arranged in advance Scape corresponds to preset first focusing algorithm.

S104: picture pick-up device controls the focus motor in this picture pick-up device according to the first focusing algorithm and is focused.

For same image, with the stepping position of the focus motor in picture pick-up device, such as focus position, as Abscissa, with the focus features value of image data, i.e. focus value establishes rectangular coordinate system as ordinate.Connection is every The corresponding focus features value of a stepping position, the HPF (High Pass Filter, high-pass filter) for forming image data are bent Line.HPF curve includes HHPF curve and LHPF curve.

When focus motor carries out stepping movement with top gear, correspondence obtains HHFP (the High speed of image data High Pass Filter, high speed high-pass filter) curve.When focus motor carries out stepping movement with low or first gear, to deserved To LHFP (Low speed High Pass Filter, low speed high-pass filter) curve of image data.Each reality of the invention Apply in example, the top gear of focus motor, low or first gear specific value can by technical staff rule of thumb, experimental data or reality Border situation is preset.

HHFP and LHFP maximum focus features value having the same, is overlapped, in other parts at maximum focus features value It is not overlapped.

For image, image is more clear, and the minutia of image is more, for example, image border more sharp details more More, the corresponding high fdrequency component of the image data is also more, and calculated focus features value is also bigger.It is, therefore, usually considered that making an uproar When the disturbing factors such as sound are controlled in the limit of permission, maximum focus features are worth the stepping position of corresponding aggregation motor, i.e., Clearest position is focused for image.

Therefore, the process that picture pick-up device focuses is converted into and determines maximum focus features in above-mentioned HPF curve by algorithm After value, focus motor is navigated into the process that the maximum focus features are worth corresponding stepping position.Traditional method is usually to use (hill climbing) algorithm climb the mountain to determine HPF curve maximum focus features value.And first in the embodiment of the present invention one Focusing algorithm specifically can be derivative algorithm or innovatory algorithm based on hill-climbing algorithm.

The present inventor is into crossing the study found that under low-illumination scene, and the fluctuating of LHPF curve is relatively small, curve In mountain peak it is unobvious, it is not easy to determine the maximum focus features value at summit.Therefore, main to consider from HHPF curve really Make maximum focus features value.

In this step, picture pick-up device periodically controls focus motor and carries out top gear stepping shifting according to the first focusing algorithm It moves and determines the corresponding maximum focus features value of stepping position.

Picture pick-up device carries out top gear stepping movement within the monocycle and determines the process of maximum focus features value, packet It includes:

Picture pick-up device controls focus motor with top gear to shortening image distance or increasing the direction of image distance, and mobile one is defaulted Step pitch after so that the imaging plane where sensor devices is moved to current stepping position from previous stepping position, camera shooting Equipment determines the corresponding present convergence characteristic value of current stepping position.

And picture pick-up device judges whether present convergence characteristic value is less than the corresponding previous focusing spy of previous stepping position Value indicative；If it is not, then using present convergence characteristic value as previous focus features value after, carry out next period top gear stepping move It is dynamic；If so, using previous focus features value as maximum focus features value, and control focus motor and navigate to previous stepping position End is postponed to focus.

Later, when picture pick-up device can be according to terminating to focus, the Stepping positioning of focus motor is shot, and it is clear to obtain Image.

In the embodiment of the present invention one, top gear stepping shifting is carried out using the first focusing algorithm periodically control focus motor It moves and determines the corresponding maximum focus features value of stepping position, determined actually on the HHPF curve under illumination scene Maximum focus features value out；It can be looked on, the unconspicuous LHPF curve of wave crest relatively small to avoid the fluctuating in low-illumination scene Mistake can not find maximum aggregation characteristic value and the phenomenon of empty burnt or dead coke occurs, greatly improves the success rate of focusing, mentions The probability for having risen image clearly improves the experience of user.

Moreover, in the embodiment of the present invention one, since the stepping that control focus motor carries out top gear is mobile, focusing speed Comparatively fast, the efficiency of focusing is improved, user is shortened and waits the time for focusing and completing, improve the experience of user.

Further, in the embodiment of the present invention one, picture pick-up device is provided with upper gain limit value for sensitivity yield value, and Provided with less than the upper gain limit value gain threshold；So that can not only promote the brightness of image, but also will not introduce More noises.

Embodiment two

The flow diagram of the focus method based on simple scenario of the embodiment of the present invention two is as shown in Fig. 2, include such as Lower step:

S201: picture pick-up device determines that frequency is high in the focus features value of the image data for the image data of acquisition In the number of the characteristic component of assigned frequency.

Specifically, image data is transformed into frequency domain by picture pick-up device, obtains multiple frequencies of each pixel of the image data Rate characteristic component；According to preset high pass filter, the multiple of each pixel are extracted from each frequecy characteristic component of each pixel High-frequency characteristic component；According to multiple high-frequency characteristic components of each pixel, the focus features value of the image data is determined.

The focus features value of image data is decomposed into the characteristic component of multiple frequencies of each pixel, Cong Zhongti by picture pick-up device All characteristic components that frequency is higher than assigned frequency are taken out, the number of all characteristic components of extraction is counted.

Preferably, picture pick-up device is before determining the focus features value of image data, from each pixel of image data In each frequency component, all characteristic components that frequency is higher than assigned frequency are extracted, all characteristic components of extraction are counted Number.

S202: picture pick-up device is if it is determined that frequency is higher than the characteristic component of assigned frequency in the focus features value of image data Number be lower than preset characteristic component quantity threshold, then determine simple scenario as phase from preset multiple photographed scenes Matched photographed scene.

It was found by the inventors of the present invention that simple scenario is usually largely or entirely all to be metope or ground in image range The scene all more single without obvious boundary line, spinulose tree fern angle, color graphics such as face.The side of reference object in the image data of simple scenario Edge is less, details is less, and the number for being transformed into high fdrequency component after frequency domain is relatively fewer.

Therefore, spy of the simple scenario with frequency in focus features value higher than assigned frequency in preset multiple photographed scenes The number of sign component is less, is lower than the characteristics of preset characteristic component quantity threshold.

Picture pick-up device is if it is determined that frequency is higher than the number of the characteristic component of assigned frequency in the focus features value of image data Mesh is lower than preset characteristic component quantity threshold, then determines that simple scenario is used as from preset multiple photographed scenes and match Photographed scene.

S203: picture pick-up device determines preset second focusing algorithm corresponding with simple scenario.

Specifically, picture pick-up device is from the photographed scene and focusing algorithm being correspondingly arranged in advance, determines and simple scenario Corresponding preset second focusing algorithm.

The second focusing algorithm in the embodiment of the present invention two specifically can be the derivative algorithm based on hill-climbing algorithm or change Into algorithm.

S204: picture pick-up device controls the focus motor in this picture pick-up device according to the second focusing algorithm and is focused.

For the present inventor into crossing the study found that under simple scenario, the wave crest of HPF curve is lower, i.e., wave crest indicates Maximum focus features value it is smaller, and the distance from plateau to wave crest is shorter.If controlling focus motor with top gear It is mobile to carry out stepping, it is easy to miss the wave crest where maximum focus features value, and lead to empty burnt or dead coke.

In this step, picture pick-up device periodically controls focus motor and carries out low or first gear stepping shifting according to the second focusing algorithm It moves and determines the corresponding maximum focus features value of stepping position.

Picture pick-up device carries out low or first gear stepping movement within the monocycle and determines the process of maximum focus features value, packet It includes:

Picture pick-up device controls focus motor with low or first gear to shortening image distance or increasing the direction of image distance, and mobile one is defaulted Step pitch after so that the imaging plane where sensor devices is moved to current stepping position from previous stepping position, camera shooting Equipment determines the corresponding present convergence characteristic value of current stepping position.

And picture pick-up device judges whether present convergence characteristic value is less than the corresponding previous focusing spy of previous stepping position Value indicative；If it is not, then using present convergence characteristic value as previous focus features value after, carry out next period low or first gear stepping move It is dynamic；If so, using previous focus features value as maximum focus features value, and control focus motor and navigate to previous stepping position End is postponed to focus.

Later, when picture pick-up device can be according to terminating to focus, the Stepping positioning of focus motor is shot, available Clearly image.

In the embodiment of the present invention two, low or first gear stepping shifting is carried out using the second focusing algorithm periodically control focus motor It moves and determines the corresponding maximum focus features value of stepping position, actually determined on the LHPF curve under simple scenario Maximum focus features value；It can be special to avoid maximum focusing is missed on the HHPF curve that the wave crest in simple scenario is lower and slope is shorter The phenomenon of empty burnt or dead coke, greatly improves the success rate of focusing, it is clear to improve image caused by wave crest where value indicative Clear probability improves the experience of user.

Embodiment three

The flow diagram for the focus method based on point light source scene that the embodiment of the present invention three provides is as shown in figure 3, packet Include following steps:

S301: picture pick-up device determines the focus features value of the image data for the image data of acquisition.

Specifically, the image data that picture pick-up device will acquire is transformed into frequency domain, obtains each pixel of the image data Multiple frequecy characteristic components；According to preset high pass filter, mentioned from each frequecy characteristic component of each pixel of image data Take out multiple high-frequency characteristic components of each pixel；According to multiple high-frequency characteristic components of each pixel, the image data is determined Focus features value.

S302: picture pick-up device is if it is determined that focus features value is higher than preset focus features upper limit threshold, it is determined that goes out point Light source scene is as the photographed scene to match.

The present inventor carries out image and picks up into crossing the study found that when picture pick-up device is to the lamp of point light source, such as night When taking, if point light source sends empty coke, halation would generally be generated.Halation shows numerically, is exactly each pixel of image data Each frequecy characteristic component in, the number of high-frequency characteristic component sharply increases, and causes the focus features value of image data abnormal Greatly, considerably beyond the range of normal focus features value.

Therefore, technical staff can determine the range of normal focus features value according to historical data and experimental data, and Rule of thumb, focus features upper limit threshold is arranged in experimental data or actual conditions in picture pick-up device；The focus features upper limit Threshold value is in the range of normal focus features value.

There is preset multiple photographed scene midpoints light source scene focus features value to be higher than preset focus features upper limit threshold The characteristics of value.

Picture pick-up device is if it is determined that the focus features value of image data is higher than preset focus features upper limit threshold, then from pre- If multiple photographed scenes in determine point light source scene as the photographed scene to match.

S303: picture pick-up device determines preset tertiary focusing algorithm corresponding with point light source scene.

Specifically, picture pick-up device is determined and point light source field from the photographed scene and focusing algorithm being correspondingly arranged in advance Scape corresponds to preset tertiary focusing algorithm.

Preferably, the tertiary focusing algorithm in the embodiment of the present invention three specifically can be the derivative algorithm based on hill-climbing algorithm Or innovatory algorithm.

S304: picture pick-up device controls the focus motor in this picture pick-up device according to tertiary focusing algorithm and is focused.

The present inventor has found after study, and under point light source scene, the HPF curve of image data has occurred very big Variation.When point light source focus, halation reaches minimum, and focus features value is minimum, the minimum point in corresponding HPF curve.And point When light source is empty burnt, halation is all larger, the range of all very big, all far super normal focus features value of focus features value, corresponding HPF curve In higher point, a series of higher point relative relief is smaller, almost connects in line；At this time, it is easy to occur to find maximum The failure of focus features value leads to the phenomenon for empty burnt or dead coke occur.

In this step, picture pick-up device can be negated focus features value, obtain negative focusing characteristic value；It will determine minimum poly- The process of burnt characteristic value is converted to the process that maximum negative focusing characteristic value is determined from negative HPF curve.

Specifically, picture pick-up device periodically controls focus motor and carries out stepping movement and determine according to tertiary focusing algorithm The corresponding maximum negative focusing characteristic value of stepping position out；

Picture pick-up device carries out stepping movement within the monocycle and determines the process of maximum negative focusing characteristic value, comprising:

Picture pick-up device controls focus motor to the direction for shortening image distance or increase image distance, the step pitch of a mobile default Afterwards, so that the imaging plane where sensor devices is moved to current stepping position from previous stepping position.Picture pick-up device is true Make the corresponding present convergence characteristic value of current stepping position；After picture pick-up device negates present convergence characteristic value, obtain current Negative focusing characteristic value.

And picture pick-up device judges whether current negative focusing characteristic value is less than corresponding previous bear of previous stepping position and gathers Burnt characteristic value；If it is not, then using current negative focusing characteristic value as previous negative focusing characteristic value after, carry out next period stepping move It is dynamic；If so, using previous negative focusing characteristic value as maximum negative focusing characteristic value, and control focus motor and navigate to previous step Carry postpones end and focuses.

Preferably, picture pick-up device can control focus motor and carry out stepping movement with top gear in this step.

In the embodiment of the present invention three, using when point light source focus, halation is minimum, focus features under point light source scene Value minimum, the i.e. feature of negative focusing characteristic value maximum；After negating to the focus features value of image data, maximum negative focusing is determined Characteristic value；Most of region fluctuating is smaller on corresponding HPF curve when can be empty burnt to avoid point light source, it is maximum poly- to be difficult to determine The case where burnt characteristic value, so as to avoid greatly improving the success rate of focusing there is a phenomenon where empty burnt or dead coke, being promoted The probability of image clearly, improves the experience of user.

Example IV

The flow diagram for the method for congregating based on focal length scene that the embodiment of the present invention four provides is as shown in figure 4, packet Include following steps:

S401: picture pick-up device determines the step of zoom motor when obtaining the image data for the image data of acquisition Into value.

Specifically, when picture pick-up device can be determined to obtain image data, the step value of the zoom motor of this picture pick-up device, Such as the value of ZOOM position.

S402: if picture pick-up device according to the step value of zoom motor, determines that this picture pick-up device is in focal length end, it is determined that Focal length scene is as the photographed scene to match out.

Specifically, focal length scene has the characteristics that focal length is larger in preset multiple photographed scenes.

If picture pick-up device determines the equivalent focal length of the optical lens group of this picture pick-up device according to the step value of zoom motor It is larger, zoom ratio is larger, for example, determining that this picture pick-up device is in focal length end, then from preset more than 10 Zoom Lens Determine focal length scene as the photographed scene to match in multiple photographed scenes.

S403: picture pick-up device determines preset 4th focusing algorithm corresponding with focal length scene.

Specifically, picture pick-up device is determined and focal length scene from the photographed scene and focusing algorithm being correspondingly arranged in advance Corresponding preset 4th focusing algorithm.

The 4th focusing algorithm in the embodiment of the present invention four specifically can be the derivative algorithm based on hill-climbing algorithm or change Into algorithm.

S404: picture pick-up device controls the focus motor in this picture pick-up device according to the 4th focusing algorithm and is focused.

The present inventor is into crossing the study found that when picture pick-up device is in focal length scene, scenery lesser for object distance It can not be focused；Many regions are relatively flat in HPF curve, the wave crest steeper where maximum focus features value.Moreover, Multiple stepping positions that focus motor can not focus, all fall within region relatively flat in HPF curve, utilize traditional calculation of climbing the mountain Method is easy to look for maximum focus features value back and forth in flat region, so as to cause empty burnt or dead coke.

Therefore, it is determined in this step according to the 4th focusing algorithm, the step value and preset step pitch table of zoom motor Effective stepping range of focus motor out.Stepping position of the focus motor within the scope of effective stepping has the possibility of focus.From And the corresponding stepping position of maximum focus features value can be determined from HPF curve within the scope of smaller stepping, it improves Focusing efficiency.

Moreover, first can determine wave crest within the scope of effective stepping using top gear and biggish step pitch, however use Low or first gear and lesser step pitch more accurately determine maximum focus features value from wave crest, promote the accuracy and effect of focusing Rate.

In this step, picture pick-up device controls focus motor and navigates to rising for effective stepping range according to the 4th focusing algorithm After beginning stepping position, with preset long step pitch to shortening image distance or increasing the direction of image distance, the stepping for carrying out top gear is mobile, And determine the growth rate of the adjacent corresponding focus features value of long stepping position.

Long step pitch is greater than the step pitch of default.

When picture pick-up device determines the growth rate of focus features value greater than preset focus features value growth rate threshold value, say It is bright to have found wave crest from HPF curve；Picture pick-up device periodically control focus motor carries out the step of low or first gear with the step pitch defaulted Into movement, and calculate the corresponding maximum focus features value of stepping position.

Picture pick-up device controls focus motor with low or first gear, and direction when along top gear makes after moving the step pitch that one is defaulted Imaging plane where obtaining sensor devices is moved to current stepping position from previous stepping position, and picture pick-up device is determined to work as The corresponding present convergence characteristic value of preceding stepping position.

In the embodiment of the present invention four, picture pick-up device utilizes the longer feature of focal length under focal length scene, determines long-focus Effective stepping range that lower aggregation motor can focus；The stepping range that can not be focused directly is skipped, to avoid not gather There is a phenomenon where empty burnt or dead burnt within the scope of burnt stepping.

Moreover, picture pick-up device controls focus motor within the scope of effective stepping, first with high speed in the embodiment of the present invention four Shelves and biggish step pitch search the wave crest on HPF curve, when the growth rate of adjacent focus characteristic value is greater than preset focus features When being worth growth rate threshold value, wave crest is found in determination；It shortens and searches wave crest the time it takes, improve the effect of entire focusing Rate.

Further, in the embodiment of the present invention four, picture pick-up device controls focus motor within the scope of effective stepping, determines After wave crest and its corresponding stepping position, with the step pitch of low or first gear and lesser default, wave crest summit is determined more accurately Represented maximum focus features value；To improve the precision of focusing, further prevent empty burnt or dead burnt phenomenon occur, so that The image of shooting is more clear, and improves the experience of user.

Embodiment five

The focus method based on photographed scene of the embodiment of the present invention five is described below.

Specifically, picture pick-up device determines the characteristic value and acquisition of the following image data for the image data of acquisition The acquisition parameters when image data:

Sensitivity yield value when obtaining the image data, frequency is higher than specified frequency in the focus features value of the image data The step of the number of the characteristic component of rate, the focus features value of the image data and zoom motor when obtaining the image data Into value.

Specific to determine that method refer to above-described embodiment one to four, details are not described herein again.

If picture pick-up device for image data, determines to obtain the sensitivity yield value of the image data not higher than preset Gain threshold, the image data focus features value in frequency be higher than assigned frequency characteristic component number not less than feature point Measure quantity threshold, the focus features value of the image data is not higher than preset focus features upper limit threshold and the image focuses Characteristic value is not higher than preset focus features upper limit threshold, then determines common scenarios conduct from preset multiple photographed scenes The photographed scene to match.

Preferably, common scenarios can be wide-angle scene；Wide-angle scene has the characteristics that focal length is lesser.

Picture pick-up device determines preset 5th focusing algorithm corresponding with focal length scene.

Preferably, the 5th focusing algorithm specifically can be hill-climbing algorithm.

Picture pick-up device controls the focus motor in this picture pick-up device according to the 5th focusing algorithm and is focused.

It is focused preferably, picture pick-up device controls the focus motor in this picture pick-up device according to hill-climbing algorithm, specific side Method is well known to those skilled in the art, and details are not described herein again.

Embodiment six

Based on the above embodiment one to five, the interior of the picture pick-up device in the present invention is mainly introduced in the embodiment of the present invention six The block schematic illustration of portion's structure, the internal structure is as shown in Figure 5, comprising: characteristic value and parameter determination module 501, photographed scene Matching module 502, focusing mode determining module 503 and focus module 504.

Wherein, characteristic value and parameter determination module 501 are used for the image data for acquisition, determine the image data Characteristic value and/or acquisition parameters when obtaining the image data.

Photographed scene matching module 502 is used for from preset multiple photographed scenes, determines the feature with image data The photographed scene that value and/or acquisition parameters match.

Focusing mode determining module 503 is for determining preset focusing mode corresponding with the photographed scene to match.

Focus module 504 is used to be focused according to the focusing mode determined, for shooting.

Preferably, characteristic value and parameter determination module 501 are specifically used for determining sensitivity when obtaining the image data Yield value.

Photographed scene matching module 502 is specifically used for if it is determined that sensitivity yield value is higher than preset gain threshold, then Determine low-illumination scene as the photographed scene to match.

Focusing mode determining module 503 is specifically used for determining preset first focusing algorithm corresponding with low-illumination scene.

Focus module 504 is gathered specifically for controlling the focus motor in this picture pick-up device according to the first focusing algorithm It is burnt.

More preferably, focus module 504 periodically controls focus motor and carries out top gear stepping shifting according to the first focusing algorithm It moves and determines the corresponding maximum focus features value of stepping position；Wherein, it is mobile and determining that top gear stepping is carried out in the monocycle The process of maximum focus features value out, comprising: after the step pitch of the mobile default of top gear, determine current stepping position pair The present convergence characteristic value answered；Judge whether present convergence characteristic value is less than the corresponding previous focus features of previous stepping position Value；If it is not, then using present convergence characteristic value as previous focus features value after, the top gear stepping for carrying out next period is mobile； If so, using previous focus features value as maximum focus features value, and control focus motor and navigate to previous stepping position After terminate to focus.

Preferably, characteristic value and parameter determination module 501 are specifically used in the focus features value for determining the image data Frequency is higher than the number of the characteristic component of assigned frequency.

Photographed scene matching module 502 is specifically used for if it is determined that the number of characteristic component is lower than preset characteristic component number Mesh threshold value, it is determined that go out simple scenario as the photographed scene to match.

Focusing mode determining module 503 is specifically used for determining preset second focusing algorithm corresponding with simple scenario.

Focus module 504 is gathered specifically for controlling the focus motor in this picture pick-up device according to the second focusing algorithm It is burnt.

More preferably, focus module 504 periodically controls focus motor and carries out low or first gear stepping shifting according to the second focusing algorithm It moves and determines the corresponding maximum focus features value of stepping position；Wherein, it is mobile and determining that low or first gear stepping is carried out in the monocycle The process of maximum focus features value out, comprising: after the step pitch of the mobile default of low or first gear, determine current stepping position pair The present convergence characteristic value answered；Judge whether present convergence characteristic value is less than the corresponding previous focus features of previous stepping position Value；If it is not, then using present convergence characteristic value as previous focus features value after, the low or first gear stepping for carrying out next period is mobile； If so, using previous focus features value as maximum focus features value, and control focus motor and navigate to previous stepping position After terminate to focus.

Preferably, characteristic value and parameter determination module 501 are specifically used for determining the focus features value of the image data；

Photographed scene matching module 502 is specifically used for if it is determined that focus features value is higher than preset focus features upper limit threshold Value, it is determined that go out point light source scene as the photographed scene to match；

Focusing mode determining module 503 is specifically used for determining preset tertiary focusing algorithm corresponding with point light source scene；

Focus module 504 is gathered specifically for controlling the focus motor in this picture pick-up device according to tertiary focusing algorithm It is burnt.

More preferably, it is mobile and true periodically to control focus motor progress stepping according to tertiary focusing algorithm for focus module 504 Make the corresponding maximum negative focusing characteristic value of stepping position；Wherein, stepping movement is carried out in the monocycle and is determined maximum negative poly- The process of burnt characteristic value, comprising: after the step pitch of a mobile default, determine the corresponding present convergence feature of current stepping position Value；After negating to present convergence characteristic value, current negative focusing characteristic value is obtained；Before judging whether current negative focusing characteristic value is less than The corresponding previous negative focusing characteristic value of one stepping position；If it is not, then special using current negative focusing characteristic value as previous negative focusing After value indicative, the stepping for carrying out next period is mobile；If so, using previous negative focusing characteristic value as maximum negative focusing characteristic value, And it controls end after focus motor navigates to previous stepping position and focuses.

Preferably, characteristic value and parameter determination module 501 are specifically used for determining zoom electricity when obtaining the image data The step value of machine；

If photographed scene matching module 502 is specifically used for the step value according to zoom motor, this picture pick-up device place is determined In focal length end, it is determined that go out focal length scene as the photographed scene to match；

Focusing mode determining module 503 is specifically used for determining preset 4th focusing algorithm corresponding with focal length scene；

Focus module 504 is gathered specifically for controlling the focus motor in this picture pick-up device according to the 4th focusing algorithm It is burnt.

More preferably, focus module 504 is according to the 4th focusing algorithm, the step value and preset step pitch table of zoom motor, Determine effective stepping range of focus motor；After control focus motor navigates to the starting stepping position of effective stepping range, It is mobile with the stepping that preset long step pitch carries out top gear, and determine the adjacent corresponding focus features value of long stepping position Growth rate；Long step pitch is greater than the step pitch of default；When the growth rate for determining focus features value is greater than preset focus features value When growth rate threshold value, the stepping that the step pitch for periodically controlling focus motor to default carries out low or first gear is mobile, and calculates stepping The corresponding maximum focus features value in position；Wherein, low or first gear stepping movement is carried out in the monocycle and determines maximum focus features The process of value, comprising: after the step pitch of the mobile default of low or first gear, determine that the corresponding present convergence of current stepping position is special Value indicative；Judge whether present convergence characteristic value is less than the corresponding previous focus features value of previous stepping position；If it is not, will then work as After prefocusing characteristic value is as previous focus features value, the low or first gear stepping for carrying out next period is mobile；If so, by previous poly- Burnt characteristic value controls end after focus motor navigates to previous stepping position and focuses as maximum focus features value.

Characteristic value and parameter determination module 501, photographed scene matching module 502, focusing mould in the embodiment of the present invention six The implementation method of 504 function of formula determining module 503 and focus module, can be with reference to the process step in above-described embodiment one to five Particular content, details are not described herein again.

To sum up, in technical solution of the present invention, before picture pick-up device shooting, image data is obtained；Determine the image The characteristic value of data and/or acquisition parameters when obtaining the image data；From preset multiple photographed scenes, determines and scheme The photographed scene to match as the characteristic value and/or acquisition parameters of data；It determines corresponding with the photographed scene to match default Focusing mode；It is focused according to the focusing mode determined.It is utilized as photographed scene and corresponds to preset focusing mode progress It focuses, is focused compared to using same focusing mode, is more applicable for the photographed scene, so that focusing highly efficient, suitable Freely, can prevent empty burnt or dead burnt phenomenon can promote user experience so that imaging is more clear.

Those skilled in the art of the present technique are appreciated that the present invention includes being related to for executing in operation described herein One or more equipment.These equipment can specially design and manufacture for required purpose, or also may include general Known device in computer.These equipment have the computer program being stored in it, these computer programs are selectively Activation or reconstruct.Such computer program can be stored in equipment (for example, computer) readable medium or be stored in It e-command and is coupled in any kind of medium of bus respectively suitable for storage, the computer-readable medium includes but not Be limited to any kind of disk (including floppy disk, hard disk, CD, CD-ROM and magneto-optic disk), ROM (Read-Only Memory, only Read memory), RAM (Random Access Memory, immediately memory), EPROM (Erasable Programmable Read-Only Memory, Erarable Programmable Read only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or light card Piece.It is, readable medium includes by equipment (for example, computer) with any Jie for the form storage or transmission information that can be read Matter.

Those skilled in the art of the present technique be appreciated that can be realized with computer program instructions these structure charts and/or The combination of each frame and these structure charts and/or the frame in block diagram and/or flow graph in block diagram and/or flow graph.This technology neck Field technique personnel be appreciated that these computer program instructions can be supplied to general purpose computer, special purpose computer or other The processor of programmable data processing method is realized, to pass through the processing of computer or other programmable data processing methods The scheme specified in frame or multiple frames of the device to execute structure chart and/or block diagram and/or flow graph disclosed by the invention.

Those skilled in the art of the present technique have been appreciated that in the present invention the various operations crossed by discussion, method, in process Steps, measures, and schemes can be replaced, changed, combined or be deleted.Further, each with having been crossed by discussion in the present invention Kind of operation, method, other steps, measures, and schemes in process may also be alternated, changed, rearranged, decomposed, combined or deleted. Further, in the prior art to have and the step in various operations, method disclosed in the present invention, process, measure, scheme It may also be alternated, changed, rearranged, decomposed, combined or deleted.

The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims

1. a kind of focus method based on photographed scene characterized by comprising

Shooting ginseng for the image data of acquisition, when determining the characteristic value of the image data and/or obtaining the image data Number, comprising: determine the step value of zoom motor when obtaining the image data；

From preset multiple photographed scenes, determine and the characteristic value of described image data and/or the acquisition parameters phase The photographed scene matched, comprising: if determining that this picture pick-up device is in focal length end, then really according to the step value of the zoom motor Make the photographed scene that focal length scene matches as described in；

Determine preset focusing mode corresponding with the photographed scene to match, comprising: determine corresponding with focal length scene Preset 4th focusing algorithm；

It is focused according to the focusing mode determined, for shooting, comprising:

The focus motor in this picture pick-up device is controlled according to the 4th focusing algorithm to be focused；

It is described focus motor in this picture pick-up device is controlled according to the 4th focusing algorithm to be focused, comprising:

According to the 4th focusing algorithm, the step value and preset step pitch table of the zoom motor, the focus motor is determined Effective stepping range；

It controls after the focus motor navigates to the starting stepping position of effective stepping range, is carried out with preset long step pitch The stepping of top gear is mobile, and determines the growth rate of the adjacent corresponding focus features value of long stepping position；The long step Away from the step pitch for being greater than default；

When the growth rate for determining the focus features value is greater than preset focus features value growth rate threshold value, periodically control The focus motor is mobile with the stepping that the step pitch defaulted carries out low or first gear, and it is special to calculate the corresponding maximum focusing of stepping position Value indicative.

2. the method according to claim 1, wherein the characteristic value for determining the image data and/or obtaining Take the acquisition parameters when image data, comprising:

Determine sensitivity yield value when obtaining the image data；And

The photographed scene for determining to match with the characteristic value of described image data and/or the acquisition parameters, comprising:

If it is determined that the sensitivity yield value is higher than preset gain threshold, it is determined that go out low-illumination scene as the phase The photographed scene matched；And

The focusing mode that the basis is determined is focused, comprising:

3. according to the method described in claim 2, it is characterized in that, described control in this picture pick-up device according to the first focusing algorithm Focus motor be focused, comprising:

According to the first focusing algorithm, periodically controls the focus motor and carry out top gear stepping movement and determine stepping position Corresponding maximum focus features value；

Wherein, the top gear stepping movement is carried out in the monocycle and determines the process of the maximum focus features value, comprising:

Judge whether the present convergence characteristic value is less than the corresponding previous focus features value of previous stepping position；If it is not, then After using the present convergence characteristic value as the previous focus features value, the top gear stepping for carrying out next period is mobile；If Be, then using the previous focus features value as maximum focus features value, and control the focus motor navigate to it is described previous Terminate to focus after a stepping position.

4. the method according to claim 1, wherein the characteristic value for determining the image data and/or obtaining Take the acquisition parameters when image data, comprising:

If it is determined that the number of the characteristic component is lower than preset characteristic component quantity threshold, it is determined that go out simple scenario conduct The photographed scene to match；And

The focusing mode that the basis is determined is focused, comprising:

5. according to the method described in claim 4, it is characterized in that, described control in this picture pick-up device according to the second focusing algorithm Focus motor be focused, comprising:

According to the second focusing algorithm, periodically controls the focus motor and carry out low or first gear stepping movement and determine stepping position Corresponding maximum focus features value；

Wherein, the low or first gear stepping movement is carried out in the monocycle and determines the process of the maximum focus features value, comprising:

Judge whether the present convergence characteristic value is less than the corresponding previous focus features value of previous stepping position；If it is not, then After using the present convergence characteristic value as the previous focus features value, the low or first gear stepping for carrying out next period is mobile；If Be, then using the previous focus features value as maximum focus features value, and control the focus motor navigate to it is described previous Terminate to focus after a stepping position.

6. the method according to claim 1, wherein the characteristic value for determining the image data and/or obtaining Take the acquisition parameters when image data, comprising:

Determine the focus features value of the image data；And

If it is determined that the focus features value is higher than preset focus features upper limit threshold, it is determined that go out point light source scene as institute State the photographed scene to match；And

The focusing mode that the basis is determined is focused, comprising:

7. according to the method described in claim 6, it is characterized in that, described control in this picture pick-up device according to tertiary focusing algorithm Focus motor be focused, comprising:

According to tertiary focusing algorithm, periodically controls the focus motor and carry out stepping movement and determine that stepping position is corresponding Maximum negative focusing characteristic value；

After the step pitch of a mobile default, the corresponding present convergence characteristic value of current stepping position is determined；To described current poly- After burnt characteristic value negates, current negative focusing characteristic value is obtained；

Judge whether the current negative focusing characteristic value is less than the corresponding previous negative focusing characteristic value of previous stepping position；If It is no, then using the current negative focusing characteristic value as the previous negative focusing characteristic value after, the stepping for carrying out next period is mobile； If so, using the previous negative focusing characteristic value as maximum negative focusing characteristic value, and control the focus motor and navigate to institute Terminate to focus after stating previous stepping position.

8. the method according to claim 1, wherein it is mobile and determining to carry out the low or first gear stepping in the monocycle The process of the maximum focus features value out, comprising:

9. a kind of picture pick-up device characterized by comprising

Characteristic value and parameter determination module, for the image data for acquisition, determine the image data characteristic value and/or The acquisition parameters when image data are obtained, specifically for determining the step value of zoom motor when obtaining the image data；

Photographed scene matching module, for determining the characteristic value with described image data from preset multiple photographed scenes And/or the photographed scene that the acquisition parameters match, if determining this specifically for the step value according to the zoom motor Picture pick-up device is in focal length end, it is determined that goes out the photographed scene that focal length scene matches as described in；

Focusing mode determining module, for determining preset focusing mode corresponding with the photographed scene to match, specifically For determining preset 4th focusing algorithm corresponding with focal length scene；

Focus module, for shooting, is specifically used for focusing according to the 4th and calculate for being focused according to the focusing mode determined Method controls the focus motor in this picture pick-up device and is focused；Specifically, according to the 4th focusing algorithm, the step of the zoom motor Into value and preset step pitch table, effective stepping range of the focus motor is determined；The focus motor is controlled to navigate to It is mobile with the stepping that preset long step pitch carries out top gear after the starting stepping position of effective stepping range, and determine The growth rate of the adjacent corresponding focus features value of long stepping position；The long step pitch is greater than the step pitch of default；When determining When the growth rate of the focus features value is greater than preset focus features value growth rate threshold value, the focus motor is periodically controlled It is mobile with the stepping that the step pitch of default carries out low or first gear, and calculate the corresponding maximum focus features value of stepping position.

10. equipment according to claim 9, which is characterized in that

The characteristic value and parameter determination module are specifically used for determining sensitivity yield value when obtaining the image data；

The photographed scene matching module is specifically used for if it is determined that the sensitivity yield value is higher than preset gain threshold, then Determine the photographed scene that low-illumination scene matches as described in；

The focus module is focused specifically for controlling the focus motor in this picture pick-up device according to the first focusing algorithm.

11. equipment according to claim 10, which is characterized in that

The focus module is specifically used for periodically controlling the focus motor according to the first focusing algorithm and carrying out top gear stepping It moves and determines the corresponding maximum focus features value of stepping position；Wherein, it is mobile that the top gear stepping is carried out in the monocycle And determine the process of the maximum focus features value, comprising: after the step pitch of the mobile default of top gear, determine current The corresponding present convergence characteristic value of stepping position；It is corresponding to judge whether the present convergence characteristic value is less than previous stepping position Previous focus features value；If it is not, then using the present convergence characteristic value as the previous focus features value after, carry out it is next The top gear stepping in period is mobile；If so, using the previous focus features value as maximum focus features value, and described in control Focus motor terminates to focus after navigating to the previous stepping position.

12. equipment according to claim 9, which is characterized in that

The characteristic value and parameter determination module are specifically used for frequency in the focus features value for determining the image data and are higher than finger Determine the number of the characteristic component of frequency；

The photographed scene matching module is specifically used for if it is determined that the number of the characteristic component is lower than preset characteristic component Quantity threshold, it is determined that go out the photographed scene that simple scenario matches as described in；

The focus module is focused specifically for controlling the focus motor in this picture pick-up device according to the second focusing algorithm.

13. equipment according to claim 12, which is characterized in that

The focus module is specifically used for periodically controlling the focus motor according to the second focusing algorithm and carrying out low or first gear stepping It moves and determines the corresponding maximum focus features value of stepping position；Wherein, it is mobile that the low or first gear stepping is carried out in the monocycle And determine the process of the maximum focus features value, comprising: after the step pitch of the mobile default of low or first gear, determine current The corresponding present convergence characteristic value of stepping position；It is corresponding to judge whether the present convergence characteristic value is less than previous stepping position Previous focus features value；If it is not, then using the present convergence characteristic value as the previous focus features value after, carry out it is next The low or first gear stepping in period is mobile；If so, using the previous focus features value as maximum focus features value, and described in control Focus motor terminates to focus after navigating to the previous stepping position.

14. equipment according to claim 9, which is characterized in that

The characteristic value and parameter determination module are specifically used for determining the focus features value of the image data；

The photographed scene matching module is specifically used for if it is determined that the focus features value is higher than the preset focus features upper limit Threshold value, it is determined that go out the photographed scene that point light source scene matches as described in；

The focus module is focused specifically for controlling the focus motor in this picture pick-up device according to tertiary focusing algorithm.

15. equipment according to claim 14, which is characterized in that

The focus module is specifically used for periodically controlling the focus motor according to tertiary focusing algorithm and carrying out stepping movement simultaneously Determine the corresponding maximum negative focusing characteristic value of stepping position；Wherein, the stepping movement is carried out in the monocycle and determines institute State the process of maximum negative focusing characteristic value, comprising: after the step pitch of a mobile default, determine that current stepping position is corresponding and work as Prefocusing characteristic value；After negating to the present convergence characteristic value, current negative focusing characteristic value is obtained；Judge described current negative poly- Whether burnt characteristic value is less than the corresponding previous negative focusing characteristic value of previous stepping position；If it is not, then by the current negative focusing After characteristic value is as the previous negative focusing characteristic value, the stepping for carrying out next period is mobile；If so, by described previous negative poly- Burnt characteristic value controls after the focus motor navigates to the previous stepping position and terminates as maximum negative focusing characteristic value It focuses.

16. equipment according to claim 9, which is characterized in that

The focus module is specifically used for the monocycle interior progress low or first gear stepping movement and determines that the maximum focuses spy The process of value indicative, comprising: after the step pitch of the mobile default of low or first gear, determine the corresponding present convergence of current stepping position Characteristic value；Judge whether the present convergence characteristic value is less than the corresponding previous focus features value of previous stepping position；If it is not, Then using the present convergence characteristic value as the previous focus features value after, the low or first gear stepping for carrying out next period is mobile； If so, using the previous focus features value as maximum focus features value, and control the focus motor navigate to it is described before Terminate to focus after one stepping position.