CN105959538A - Quick focusing method and quick focusing system for double cameras - Google Patents
Quick focusing method and quick focusing system for double cameras Download PDFInfo
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- CN105959538A CN105959538A CN201610294497.1A CN201610294497A CN105959538A CN 105959538 A CN105959538 A CN 105959538A CN 201610294497 A CN201610294497 A CN 201610294497A CN 105959538 A CN105959538 A CN 105959538A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
Abstract
The invention discloses a quick focusing method and a quick focusing system for double cameras. The method comprises the following steps: acquiring a first group of focus points through a first camera and a second camera, wherein each group of focus points consists of a former focus point and a latter focus point; judging whether the focus value of the latter focus point is greater than the focus value of the former focus point; if the focus value of the latter focus point is greater than the focus value of the former focus point, continuing to acquire a next group of focus points through the first camera and the second camera, and judging whether the focus value of the latter focus point is greater than the focus value of the former focus point; and when finding three consecutive focus points of which the focus value is smaller than the focus value of a focus point before the three focus points, shooting an image by taking the focus point as a first focusing point. Through simultaneous focusing of two cameras, the focusing process is speeded up, and the focusing time can almost be halved.
Description
Technical field
The present invention relates to photographic head technical field, refer in particular to a kind of dual camera quick focusing method and
System.
Background technology
At present, when taking pictures, a focusing the most all can first be found by video camera, and the searching of focusing
Process is all based on common FV principle, and the focusing that namely an above width shooting image is found is for just
Beginning position, it is judged that the definition of this position, then with this position as starting point, to some direction along
Article one, curve increases x unit of △ every time, looks for focusing, if on some direction, passed by
After one section of ascendant trend arrives at x1, continuous three positions are all judged as downward trend, then return to initial
Point, looks for focusing towards opposite direction in the same manner, until finding a scope substantially,
The curve ranges obtained as coarse scan, the most just △ x reduces the song obtained in the same way in coarse scan
Trickle focusing is carried out, until finding the point that definition is the highest, as current picture to be captured in the range of line
Focus point.
And for dual camera, focusing is all to need to go focusing respectively, therefore, for single shooting
For machine, the time needed for focusing is relatively more long, is unfavorable for quickly taking pictures, catches excellent moment, right
The use of user causes certain inconvenience.
Summary of the invention
It is an object of the invention to provide quick focusing method and the system of a kind of dual camera, accelerate to focus
Journey, reduces focusing time, and focusing time can reduce by about one time.
According to an aspect of the present invention, it is provided that the quick focusing method of a kind of dual camera, described method
Including: obtain first group of focus point by the first photographic head, second camera, before often group focus point includes
One focus point and a rear focus point;After judgement, whether the focus value of a focus point is more than the poly-of previous focus point
Coke number;If so, continue through the first photographic head and second camera obtains next group focus point, and judge
Whether a rear focus point is more than the focus value of previous focus point;When the focusing finding continuous three focus points
When value is less than the focus value of a certain focus point before these three focus points, using described a certain focus point as the
One focusing carries out image taking.
Wherein, described using described a certain focus point as the first focusing carry out image taking step it
After, also include: the method according to searching described first focusing searches the second focusing, institute to opposite direction
State opposite direction to search the method for the second focus point and include: the first photographic head is repositioned onto focusing starting point,
Continue through the first photographic head and second camera obtains next group focus point, and after judgement, a focus point is
The no focus value more than previous focus point;When finding the focus value of continuous three focus points less than these three
During the focus value of a certain focus point before focus point, described a certain focus point is carried out as the second focusing
Image taking.
Wherein, described method also includes: between described first focusing and the second focusing, uses existing
Technology is had to search focus value maximum from described second focusing to described first focus point based on the second step-length
Focus point, carries out image taking using the focus point that focus value is maximum as the 3rd focusing.
Wherein, described second step-length is less than described first step-length.
Wherein, described previous focus point and a rear focus point is adjacent and interval the first step-length.
Wherein, described by the first photographic head, second camera obtain first group of focus point step it
Before, also include: obtain the focusing of previous image, described focusing was gathered as the initial of present image
Focus;Wherein, the previous focus point in first group of focus point that the first photographic head obtains is described initial poly-
Focus.
According to another aspect of the present invention, it is provided that the rapid focus system of a kind of dual camera, described system
System includes: the first acquiring unit, is used for obtaining previous focus point;Second acquisition unit, after user obtains
One focus point, often group focus point includes previous focus point and a rear focus point;Judging unit, is used for judging
Whether the focus value of a rear focus point is more than the focus value of previous focus point;A focus point after detecting
When focus value is more than the focus value of previous focus point, returns the first acquiring unit and second acquisition unit continues
Obtain next group focus point, and whether a focus point is more than previous focus point after judging by judging unit
Focus value;First image acquisition units, when judging unit, to find the focus value of continuous three focus points little
During the focus value of a certain focus point before these three focus points, using right as first for described a certain focus point
Focus carries out image taking.
Wherein, described system also includes: reversely search unit and the second image acquisition units;Single when judging
Unit finds the focus value focusing less than a certain focus point before these three focus points of continuous three focus points
During value, trigger and reversely search unit according to searching the method for described first focusing to opposite direction lookup second
Focusing, and control the first acquiring unit and second and return unit and obtain next group focus point, and by sentencing
After disconnected unit judges, whether a focus point is more than the focus value of previous focus point;Second image acquisition units,
For find when judging unit the focus value of continuous three focus points less than these three focus points before a certain
During the focus value of focus point, described a certain focus point is carried out image taking as the second focusing.
Wherein, described system also includes: the 3rd focusing determines unit, performs following operation: described
Between first focusing and the second focusing, use prior art based on the second step-length from described second focusing
Point searches, to described first focus point, the focus point that focus value is maximum, using focus point maximum for focus value as
3rd focusing carries out image taking.
Wherein, described second step-length is less than described first step-length.
Wherein, described previous focus point and a rear focus point is adjacent and interval the first step-length.
Wherein, described system also includes: initial focus point positioning unit, for obtaining the right of previous image
Focus, using described focusing as the initial focus point of present image;Wherein, the first acquiring unit obtains
First group of focus point in previous focus point be described initial focus point.
The quick focusing method of the dual camera that the present invention provides and system, be based on existing FV principle
On the basis of focusing, original mode is changed into two photographic head and goes focusing simultaneously, be equivalent to the first shooting
Head is when primary importance, and second camera walks the second position, and subsequent time the first photographic head is walking the 3rd
When putting, second camera walks the 4th position simultaneously, by that analogy, until finding focusing, therefore, the
One photographic head and second camera find focusing simultaneously, accelerate focus process, reduce focusing time, right
The burnt time can reduce by about one time.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the quick focusing method of dual camera of the present invention;
Fig. 2 is the schematic flow sheet of step S4 of dual camera of the present invention;
Fig. 3 is the structural representation of the rapid focus system of the dual camera of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention of greater clarity, below in conjunction with being embodied as
Mode referring to the drawings, the present invention is described in more detail.It should be understood that these describe simply example
Property, and it is not intended to limit the scope of the present invention.Additionally, in the following description, eliminate known knot
Structure and the description of technology, to avoid unnecessarily obscuring idea of the invention.
Fig. 1 is the schematic flow sheet of the quick focusing method of dual camera of the present invention.
As it is shown in figure 1, the quick focusing method of the dual camera of the present invention, described method includes walking as follows
Rapid:
Step S1, obtains first group of focus point by the first photographic head, second camera, often organizes focus point
Including previous focus point and a rear focus point.
Before this step, first obtain the focusing of previous image, using described focusing as present image
Initial focus point.
In this step, obtain previous focus point by the first photographic head, after being obtained by second camera one
Focus point, often group focus point includes previous focus point and a rear focus point.
Step S2, it is judged that whether the focus value of a rear focus point is more than the focus value of previous focus point.
In this step, the size of the focus value of the focus value of a focus point and previous focus point after comparing.When
After detecting, the focus value of a focus point is to continue through the first shooting more than the focus value of previous focus point
Head and second camera obtain next group focus point, and after judgement, whether a focus point is more than previous focus point
Focus value;
Accept above-mentioned example, the size of the focus value of the focus value of a focus point and previous focus point after comparing,
Circulation perform to obtain focus point and judge after focus value and the focus value of previous focus point big of a focus point
Little step.
In the present invention, focus value is the biggest, represents that the image of this focus point is the most clear;Focus value is the least, table
Show that the image of this focus point is the most unintelligible.
In this step, when the focus value of a rear focus point is more than the focus value of previous focus point, continue logical
Cross the first photographic head and obtain next group focus point, be further continued for judging the rear focus point in next group focus point
The size of focus value of focus value and previous focus point.
This step comprises following 4 kinds of situations:
I1Represent the previous focus point of first group of focus point, J1Represent a rear focus point of first group of focus point,
I2Represent the previous focus point of second group of focus point, J2Represent a rear focus point of second group of focus point, I3
Represent the previous focus point of the 3rd group of focus point, J3Represent a rear focus point of the 3rd group of focus point.
Situation 1: when finding I1< J1< I2< J2, now represent J2The focus value of focus point is maximum, as
Described in before, focus value is the biggest, represents that the image of this focus point is the most clear, now shows at focus point curve
In ascendant trend, then need to be continued to search for by the first photographic head and second camera, until searching everywhere
Three focus points of continuous print in downward trend.
Situation 2: when finding I1< J1< I2> J2, now show I2The focus value of focus point is maximum, this
Plant it may be the case that focus point curve has slight fluctuation or I2Focus point is crest, therefore continues detection the 3rd
I in group focus point3The focus value of focus point and J3The focus value of focus point;If J being detected2< I3< J3,
Then represent that focus point curve has slight fluctuation;If J being detected2> I3> J3, then it represents that I2Crest, by I2
Focus point is as the first focusing.If J being detected2< I3> J3, then it represents that focus point curve the most slightly floats
Dynamic;If J being detected2> I3< J3, then it represents that focus point curve has slight fluctuation.
Situation 3: work as J1≥I2≤J2Time, being now likely to focus point curve has slight fluctuation, sympathizes with
As condition 2, need to continue detection I3The focus value of focus point and J3The focus value of focus point, the most no longer
Repeat.
Situation 4: work as I1< J1> I2> J2, this it may be the case that focus point curve have slight fluctuation or
J1Focus point is crest, as situation 2, needs to continue detection I3The focus value of focus point and J3Focus on
The focus value of point, here is omitted.
Step S3, when find the focus value of continuous three focus points less than these three focus points before a certain
During the focus value of focus point, described a certain focus point is carried out image taking as the first focusing.
Accept above-mentioned example, continue through the first photographic head and obtain I3The focus value of focus point, by second
Photographic head obtains J3The focus value of focus point, as it was previously stated, until find the poly-of continuous three focus points
When coke number is less than the focus value of a certain focus point before these three focus points, using described a certain focus point as
First focusing carries out image taking.
Here, described previous focus point and described after a focus point adjacent and interval the first step-length.
Fig. 2 is the schematic flow sheet of step S4 of dual camera of the present invention.
As in figure 2 it is shown, in an optional embodiment, after described step S3, also include: step
S4, the method according to searching described first focusing searches the second focusing, described opposite direction to opposite direction
The method searching the second focus point includes:
Step S41, is repositioned onto focusing starting point by the first photographic head, continues through the first photographic head
Obtain next group focus point with second camera, and after judgement, whether a focus point is more than previous focus point
Focus value.
Step S42, certain before the focus value finding continuous three focus points is less than these three focus points
During the focus value of one focus point, described a certain focus point is carried out image taking as the second focusing.
Concrete, the method opposite direction according to searching described first focusing is searched, by nose heave for the first shooting
New definition is to described focusing starting point, and described focusing starting point is the previous focus point of first group of focus point,
Continue through the first photographic head and second camera obtains next group focus point, and after judgement, a focus point is
The no focus value more than previous focus point, same, when the focus value finding continuous three focus points is little
During the focus value of a certain focus point before these three focus points, using right as second for described a certain focus point
Focus carries out image taking.
In the present invention, step S1-step S4 may be considered the process of coarse scan, and below step S5 can
To be considered the process carefully swept, the first focusing found by step S1-step S3 is not clear
Spending the highest focus point, the first focusing is a point relatively the most clearly, in order to find the most clearly the
Three focusings thus need perform step S4 search the second focus point.
In an optional embodiment, described method also includes: step S5, in described first focusing and
Between second focusing, use prior art based on the second step-length from described second focusing to described first
Focus point searches the focus point that focus value is maximum, is clicked on as the 3rd focusing by focus point maximum for focus value
Row image taking.
In this step, between described first focusing and the second focusing, search the focusing that focus value is maximum
Point.Concrete, find focusing from described second focusing to described first focusing based on the second step-length
The focus point that value is maximum, carries out image taking using the focus point that focus value is maximum as the 3rd focusing.This
Time the 3rd focusing found out be only the focus point that definition is the highest, utilize the figure that the 3rd focusing is shot
As being only the most clearly.
Wherein, described second step-length is less than described first step-length.Optionally, described second step-length is first
The 1/2 of step-length.
Here, technical scheme is realized process to illustrate:
First, the first step, the first photographic head is using the focus point of upper piece image of shooting as focus point
Initial position x;And inscribe when same, when the first photographic head is positioned at focus point initial position x, take the photograph
Increase on the basis of being located at initial position as 2 at the x+ △ x position after shift length △ x.
Then, second step, it is judged that whether the definition at x+ △ x position residing for second camera is more than
Definition at first photographic head location x.The 3rd step the most then continued with.If it is not,
Then as it was previously stated, when detecting the presence of three points of follow-up continuous print and being in downward trend, by initial bit
Putting an x end points as coarse scan curve, the first photographic head is repositioned onto initial position x, with initially
Position x is starting point, goes to search the second focusing towards opposite direction after the same method.
Secondly, the 3rd step, the first photographic head increase on the basis of being positioned at initial position x the displacement of 2 times away from
Time away from x+2 △ x position after △ x, second camera is positioned at initial position increases by 3 times of shift length △ x
After x+3 △ x position at, again continue with and judge continuous three points, x+ △ x, x+2 △ x and x+3 △ x
Whether the definition at place is to increase always, the most then the first photographic head and second camera 2 continue respectively
Move toward next position, it is judged that the definition at each position, until the definition of continuous three points
Till occurring reducing.
Again, according to the method iteration in second step and the 3rd step, after completing coarse scan process, then position is reduced
Move distance △ x carefully to sweep in the curve ranges that coarse scan obtains in the same way, until finding clearly
Spend the highest point as focusing.
The present invention compares, compared to prior art by two focus points are focused value as one group
By the way of a photographic head compares one by one, focusing time can reduce by about one time.
Fig. 3 is the structural representation of the rapid focus system of the dual camera of the present invention.
As it is shown on figure 3, the rapid focus system of the dual camera of the present invention, described system includes: first
Acquiring unit 10, second acquisition unit 20, judging unit 30 and the first image acquisition units 40.
First acquiring unit 10, is used for obtaining previous focus point.
Second acquisition unit 20, user obtain after a focus point, often group focus point include previous focus point and
A rear focus point, wherein, described previous focus point and a rear focus point is adjacent and interval the first step-length.
Judging unit 30 is connected with described first acquiring unit 10 and second acquisition unit 20 respectively, is used for
After judgement, whether the focus value of a focus point is more than the focus value of previous focus point, a focusing after detecting
When the focus value of point is more than the focus value of previous focus point, returns the first acquiring unit 10 and second and obtain list
Unit 20 continues to obtain next group focus point, and passes through whether a focus point after judging unit 30 judges is more than
The focus value of previous focus point;
First image acquisition units 40 is connected with described judging unit 30, when judging unit 30 company of finding
When the focus value of continuous three focus points is less than the focus value of a certain focus point before these three focus points, by institute
State a certain focus point and carry out image taking as the first focusing.
Wherein, described system also includes: be connected with described judging unit 30 reversely search unit 50 and
Second image acquisition units 60;
When judging unit 30 find the focus value of continuous three focus points less than these three focus points before
During the focus value of a certain focus point, trigger and reversely search unit 40 according to the side searching described first focusing
Normal direction opposite direction searches the second focusing, and controls the first acquiring unit 10 and second and return unit 20 and obtain
Take off one group of focus point, and by a focus point after judging unit 20 judgement whether more than previous focus point
Focus value;
Second image acquisition units 60 is connected with described judging unit 30, for searching when judging unit 20
To the focus value of continuous three focus points less than the focus value of a certain focus point before these three focus points time,
Described a certain focus point is carried out image taking as the second focusing.
Wherein, described system also includes: the 3rd focusing determines that unit 70 is adopted with described first image respectively
Collection unit 10 and the second image acquisition units 20 connect, the following operation of execution:
Between described first focusing and the second focusing, use prior art based on the second step-length from institute
State the second focusing and search, to described first focus point, the focus point that focus value is maximum, by focus value maximum
Focus point carries out image taking as the 3rd focusing, and wherein, described second step-length is less than the described first step
Long.
Wherein, described system also includes: initial focus point positioning unit 80, for obtaining previous image
Focusing, using described focusing as the initial focus point of present image;Wherein, the first acquiring unit 10
Previous focus point in the first group of focus point obtained is described initial focus point.
The present invention compares by two focus points are focused value as one group, leads to compared to prior art
Crossing the mode that a photographic head compares one by one, focusing time can reduce by about one time.
As it has been described above, describe quick focusing method and the system of the dual camera of the present invention in detail, be
On the basis of the focusing of existing FV principle, original mode is changed into two photographic head and goes focusing, phase simultaneously
When in the first photographic head in primary importance time, second camera walks the second position, and subsequent time first images
Head is when walking three positions, and second camera walks the 4th position simultaneously, by that analogy, until finding clearly
Spending the highest focusing, therefore, the first photographic head and second camera find focusing simultaneously, and it is right to accelerate
Burnt process, reduces focusing time, and focusing time can reduce by about one time.
It should be appreciated that the above-mentioned detailed description of the invention of the present invention is used only for exemplary illustration or explanation
The principle of the present invention, and be not construed as limiting the invention.Therefore, without departing from the present invention spirit and
Any modification, equivalent substitution and improvement etc. done in the case of scope, should be included in the guarantor of the present invention
Within the scope of protecting.Additionally, claims of the present invention be intended to fall into scope and
Whole in the equivalents on border or this scope and border change and modifications example.
Claims (12)
1. the quick focusing method of a dual camera, it is characterised in that described method includes:
First group of focus point is obtained, before often group focus point includes by the first photographic head, second camera
One focus point and a rear focus point;
After judgement, whether the focus value of a focus point is more than the focus value of previous focus point;
If so, continue through the first photographic head and second camera obtains next group focus point, and judge
Whether a rear focus point is more than the focus value of previous focus point;
A certain focusing before the focus value finding continuous three focus points is less than these three focus points
During the focus value put, described a certain focus point is carried out image taking as the first focusing.
Method the most according to claim 1, wherein, described using described a certain focus point as
After first focusing carries out the step of image taking, also include: according to searching described first focusing
Method search the second focusing to opposite direction, described opposite direction searches the method bag of the second focus point
Include:
First photographic head is repositioned onto focusing starting point, continues through the first photographic head and second and take the photograph
As head obtains next group focus point, and after judgement, whether a focus point is more than the focusing of previous focus point
Value;
A certain focusing before the focus value finding continuous three focus points is less than these three focus points
During the focus value put, described a certain focus point is carried out image taking as the second focusing.
Method the most according to claim 2, wherein, described method also includes:
Between described first focusing and the second focusing, use prior art based on the second step-length from
Described second focusing searches, to described first focus point, the focus point that focus value is maximum, by focus value
Big focus point carries out image taking as the 3rd focusing.
Method the most according to claim 3, wherein, described second step-length is less than the described first step
Long.
5. according to the method described in any one of claim 1-4, wherein, described previous focus point with after
One focus point is adjacent and is spaced the first step-length.
6. according to the method described in any one of claim 1-4, wherein, pass through the first shooting described
Before head, second camera obtain the step of first group of focus point, also include:
Obtain the focusing of previous image, using described focusing as the initial focus point of present image;
Wherein, the previous focus point in first group of focus point that the first photographic head obtains is described initial poly-
Focus.
7. the quick focusing method of a dual camera, it is characterised in that described system includes:
First acquiring unit (10), is used for obtaining previous focus point;
Second acquisition unit (20), a focus point after user's acquisition, often group focus point includes previous poly-
Focus and a rear focus point;
Judging unit (30), after judging, whether the focus value of a focus point is more than previous focus point
Focus value;
When the focus value of a focus point is more than the focus value of previous focus point after detecting, return first
Acquiring unit (10) and second acquisition unit (20) continue to obtain next group focus point, and by sentencing
After disconnected unit (30) judgement, whether a focus point is more than the focus value of previous focus point;
First image acquisition units (40), when judging unit (30) finds continuous three focus points
Focus value less than the focus value of a certain focus point before these three focus points time, by described a certain focusing
O'clock carry out image taking as the first focusing.
System the most according to claim 7, wherein, described system also includes: reversely search list
Unit (50) and the second image acquisition units (60);
When judging unit (30) finds the focus value of continuous three focus points less than these three focus points
Before the focus value of a certain focus point time, trigger and reversely search unit (40) according to searching described first
The method of focusing searches the second focusing to opposite direction, and controls the first acquiring unit (10) and
Two return unit (20) obtains next group focus point, and gathers by after judging unit (20) judgement one
Whether focus is more than the focus value of previous focus point;
Second image acquisition units, for finding continuous three focus points when judging unit (20)
When focus value is less than the focus value of a certain focus point before these three focus points, by described a certain focus point
Image taking is carried out as the second focusing.
System the most according to claim 8, wherein, described system also includes: the 3rd focusing
Determine unit (70), the following operation of execution:
Between described first focusing and the second focusing, use prior art based on the second step-length from
Described second focusing searches, to described first focus point, the focus point that focus value is maximum, by focus value
Big focus point carries out image taking as the 3rd focusing.
System the most according to claim 9, wherein, described second step-length is less than described the
One step-length.
11. according to the system described in any one of claim 7-10, wherein, and described previous focus point
And a rear focus point is adjacent and interval the first step-length.
12. according to the system described in any one of claim 7-10, and wherein, described system also includes:
Initial focus point positioning unit (80), for obtaining the focusing of previous image, by described right
Focus is as the initial focus point of present image;
Wherein, the previous focus point in first group of focus point that the first acquiring unit (10) obtains is institute
State initial focus point.
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CN112492210A (en) * | 2020-12-01 | 2021-03-12 | 维沃移动通信有限公司 | Photographing method and device, electronic equipment and storage medium |
CN114422665A (en) * | 2021-12-23 | 2022-04-29 | 广东未来科技有限公司 | Shooting method based on multiple cameras and related device |
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