CN102193164A - Focusing method and camera - Google Patents
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- CN102193164A CN102193164A CN2010101192320A CN201010119232A CN102193164A CN 102193164 A CN102193164 A CN 102193164A CN 2010101192320 A CN2010101192320 A CN 2010101192320A CN 201010119232 A CN201010119232 A CN 201010119232A CN 102193164 A CN102193164 A CN 102193164A
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Abstract
The invention provides a focusing method and a camera. The focusing method is applied to the camera having a zoom lens. The method comprises the following steps of: (a) detecting a beginning position of the zoom lens; (b) acquiring image information of the beginning position, image information of a first position and image information of a second position by the zoom lens; (c) determining which one has the highest contrast value among the image information of the beginning position, the image information of the first position and the image information of the second position; (d) if the image information of the beginning position has the highest contrast value, finding a correct focusing position by the zoom lens according to the beginning position; and (e) if the image information of the first position has the highest contrast value, finding the correct focus position by the zoom lens with a non-equivalent distance away from the camera according to the first position. The focusing method can be used for overcoming the defect of excessive focusing time.
Description
Technical field
The present invention relates to a kind of focusing method and camera head, particularly a kind of accurate focusing method and camera head of reaching fast.
Background technology
In existing technology, the S0 of camera focus continuously the practice be in the present position of camera lens and near slightly and slightly distant positions go to calculate the correlative value of representing readability respectively, think that the position is in the scope that scans the most clearly if the correlative value in centre position is the highest, then adopt the polynomial expression approach method of mathematics to find out position the most clearly, descend if then move up to correlative value toward the big direction of correlative value at near-end or far-end, the same polynomial expression approach method of mathematics that adopts is found out position the most clearly, after finding the most clearly the position, the correlative value of clear position can go on record to determine whether scene changes, if find to change then restart the S0 program of focusing continuously, if not then keep convergence not do action.
Yet, with existing technology no matter the use of spacing be to use bigger spacing or less spacing, its disappearance is all arranged; Bigger spacing causes unsettled rolling precision dynamic and focusing to have problems; Less spacing then can cause continuous focusing at a slow speed, when particularly scene moves on to very near-end by far place, because each sampling spot of camera lens must consume the time of acquisition image frame (frame), when the camera lens stroke is very long, uses less spacing will consume many times.
Therefore, be necessary to provide a kind of focusing method and camera head, to improve the existing disappearance of prior art.
Summary of the invention
Fundamental purpose of the present invention is that a kind of focusing method and camera head are being provided, to reach the reduction S0 effect of the time of focusing continuously.
For reaching above-mentioned purpose, focusing method of the present invention comprises the following steps: to detect the reference position of zoom lens; Image information, the image information of primary importance and the image information of the second place by zoom lens acquisition reference position; Wherein primary importance is with respect to reference position and away from camera head, and the second place is with respect to reference position and near camera head; Among the image information of the image information of judgement reference position, the image information of primary importance and the second place, the correlative value of what person's image information is the highest; If the correlative value of the image information of reference position is the highest, then find out correct focusing position according to reference position by zoom lens; If the correlative value of the image information of primary importance is the highest, then by zoom lens with respect to primary importance and with non-isometric focusing sow discord every away from camera head to find out correct focusing position; And if the correlative value of the image information of the second place is the highest, then by zoom lens with respect to the second place and with non-isometric focusing sow discord every near camera head to find out correct focusing position.
The present invention also provides a kind of focusing method, is used to have a camera head of a zoom lens, and this method comprises the following steps: that (a) detects an initial position of this zoom lens; (b) capture the image information of this reference position, the image information of a primary importance and the image information of a second place by this zoom lens; (c) judge that the correlative value of what person's image information is the highest among the image information of the image information of image information, this primary importance of this reference position and this second place; (d) if the correlative value of the image information of this reference position is the highest, then find out a correct focusing position according to this reference position by this zoom lens; And (e) if the correlative value of the image information of this primary importance is the highest, then by this zoom lens with respect to this primary importance and with a non-isometric focusing sow discord every away from this camera head to find out this correct focusing position.
For reaching above-mentioned purpose, camera head of the present invention comprises that zoom lens, image analysing computer module, focusing are from module and processing module are provided; Wherein zoom lens is in order to capture the image information of a plurality of positions; The image analysing computer module is in order to the correlative value of the image information of analyzing a plurality of positions; Focusing from provide module in order to provide non-focusing equidistant and fixed range sow discord every; Processing module electrically connects zoom lens, image analysing computer module and focusing from module is provided; By this, processing module control zoom lens is when focusing action, zoom lens is sowed discord every to capture the image information of a plurality of positions with non-isometric focusing earlier, the image analysing computer module judges that at first the image information of the position of Xia Jianging is the summary focusing position after the correlative value of the image information of each position rises; Then sow discord every finding out correct focusing position with equidistant focusing according to the summary focusing position again.
The present invention can solve focusing and sow discord the focusing time disappearance of a specified duration excessively of using constant spacing and producing zoom lens every being all.
Description of drawings
Fig. 1 is the configuration diagram about an embodiment of camera head of the present invention.
Fig. 2 is the synoptic diagram of an embodiment of camera head of the present invention.
Fig. 3 and Fig. 4 are the flow chart of steps about an embodiment of focusing method of the present invention.
The primary clustering symbol description:
Camera head 1 reference position P0
Zoom lens 10 primary importance P1
Image analysing computer module 20 second place P2
Focusing is from providing module 30 the 3rd position P3
Algoritic module 40 the 4th position P4
Processing module 50
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended accompanying drawing, be described in detail below.
Below please refer to Fig. 1, about the configuration diagram of an embodiment of camera head of the present invention.
As shown in Figure 1, camera head 1 of the present invention comprises that zoom lens 10, image analysing computer module 20, focusing are from module 30, algoritic module 40 and processing module 50 are provided; Wherein zoom lens 10 is in order to capture the image information of a plurality of positions; Image analysing computer module 20 is in order to the correlative value of the image information of analyzing a plurality of positions; Focusing from provide module 30 in order to provide non-focusing equidistant and fixed range sow discord every; Processing module 50 electrically connects zoom lens 10, image analysing computer module 20, focusing from module 30 and algoritic module 40 are provided, and processing module 50 is in order to control the work of above-mentioned each device or module.
As shown in Figure 2, in one embodiment of this invention, camera head 1 of the present invention is a digital camera, but the present invention is not as limit, for instance, camera head 1 also can be Digital Video, camera cell phone or have the personal digital assistant of camera function (personal digital assistant, PDA) or other have portable electron device of camera function etc.
Be example promptly below with the camera head of the present invention 1 of Figure 1 and Figure 2, describe each step of focusing method of the present invention in detail, but it is noted that as long as can reach purpose of the present invention, method of the present invention is not exceeded with the camera head 1 that is applied in Figure 1 and Figure 2.It is noted that in one embodiment of this invention, camera head 1 uses the action of focusing of the continuous focal modes of S0, but the present invention is not exceeded to be applied to continuous focal modes.
Please in the lump referring to figs. 1 to Fig. 4, about an embodiment of focusing method of the present invention, wherein Fig. 3 and Fig. 4 are the flow chart of steps about an embodiment of focusing method of the present invention.
Whether as shown in Figure 3, the present invention at first carries out step S701: judge whether to exist correct focusing position and correct focusing position not to change.
In one embodiment of this invention, correct focusing position is meant the focusing position of the sharp image of zoom lens 10 fechtables one scene, in one embodiment of this invention, processing module 50 judges whether zoom lens 10 has obtained the correct focusing position of scene before carrying out continuous focal modes.
If do not have correct focusing position or, then carry out step S702: the reference position that detects zoom lens because of camera head 1 moves or whole scene changes correct focusing position is changed.
As shown in Figure 2, in one embodiment of this invention, processing module 50 detects the reference position P0 of zoom lens 10, and wherein reference position P0 is meant the position of zoom lens 10 before not carrying out continuous focal modes.
Then carry out step S703: image information, the image information of primary importance and the image information of the second place of acquisition reference position.
In one embodiment of this invention, image information, the image information of primary importance P1 and the image information of second place P2 by zoom lens 10 acquisition reference position P0, wherein primary importance be P1 with respect to the position of reference position P0 away from camera head 1, second place P2 is with respect to the position of reference position P0 near camera head 1.
Then carry out step S704: among the image information of the image information of judgement reference position, the image information of primary importance and the second place, the correlative value of what person's image information is the highest.
In one embodiment of this invention, among the image information of image analysing computer module 20 in order to the image information of the image information of analyzing reference position P0, primary importance P1 and second place P2, the correlative value of what person's image information is the highest.In one embodiment of this invention, image analysing computer module 20 is represented the readability of the image of scene with correlative value, and correlative value is high more, and it is clear more to represent, but the present invention is not as limit.
As shown in Figure 4, if the correlative value of the image information of reference position P0 is the highest, then carry out step S705: the image information that captures a plurality of adjacent positions before, this position.
In one embodiment of this invention, if the correlative value of the image information of reference position P0 is the highest, reference position P0 is the summary focusing position, then zoom lens 10 acquisitions are at the image information of a plurality of adjacent positions of reference position P0, each adjacent position fixed distance in fact wherein, this fixed range is decided according to the manufacturer of zoom lens 10, but the present invention is not as limit.For instance, fixed range also can be the user and sets up on their own.
Carry out step S706 at last: use the image information of each adjacent position of algorithm computation and find out correct focusing position.
In one embodiment of this invention, algoritic module 40 is in order to provide algorithm and to calculate correct focusing position, wherein algorithm comprises the polynomial expression approach method of mathematics, distance and correlative value substitution algorithm with the image information of each adjacent position, to obtain the most correct focusing position, in correlative technology field, be widely used owing to utilize with the most correct focusing position of algorithm acquisition, and be not that the present invention wants improved emphasis place, so do not repeat them here its detailed calculating principle.
As shown in Figure 3, in one embodiment of this invention,, then carry out step S707: the image information that captures the 3rd position if the correlative value of the image information of primary importance P1 is the highest.
As shown in Figure 2, in one embodiment of this invention, if the correlative value of the image information of primary importance P1 is the highest, then capture the image information of the 3rd position P3 by zoom lens 10, wherein the 3rd position P3 is away from camera head 1, and with respect to primary importance P1 at a distance of a displacement.
Then carry out step S708: whether the correlative value of judging the image information of the 3rd position descends.
In one embodiment of this invention, the correlative value than the image information of primary importance P1 is low in order to the correlative value of the image information of judging the 3rd position P3 for image analysing computer module 20.
If the correlative value of the image information of the 3rd position P3 descends, then carry out step S705: the image information that captures a plurality of adjacent positions before, this position.
In one embodiment of this invention, if the correlative value of the image information of the 3rd position P3 descends, this represents correct focusing position between the 3rd position P3 and primary importance P1, the 3rd position P3 is the summary focusing position, then zoom lens 10 captures the image information of a plurality of adjacent positions before the 3rd position P3, further, the image information of the zoom lens 10 a plurality of adjacent positions of acquisition between the 3rd position P3 and primary importance P1, each adjacent position fixed distance in fact wherein, this fixed range is decided according to the manufacturer of zoom lens 10, but the present invention is not as limit.
In one embodiment of this invention, if the correlative value of the image information of the 3rd position P3 raises, then carry out step S709: primary importance P1 is made as reference position P0, and the 3rd position P3 is made as primary importance P1, and changes displacement.
In one embodiment of this invention, if the correlative value of the image information of the 3rd position P3 raises, then represent correct focusing position to be positioned at farther place from the 3rd position P3, processing module 50 is made as reference position P0 with primary importance P1, the 3rd position P3 is made as primary importance P1, and the 3rd new position P3 and new primary importance P1 displacement apart increase first-class gap from or a geometric ratio distance, but the present invention is not as limit.In one embodiment of this invention, carry out step S709 of the present invention after, then repeating step S707.
In one embodiment of this invention, if the correlative value of the image information of second place P2 is the highest, then carry out step S710: the image information that captures the 4th position.
In one embodiment of this invention, if the correlative value of the image information of second place P2 is the highest, then by the image information of zoom lens 10 acquisitions the 4th position P4, wherein the 4th position P4 is near camera head 1, and with respect to second place P2 at a distance of a displacement.
Then carry out step S711: whether the correlative value of judging the image information of the 4th position descends.
In one embodiment of this invention, the correlative value than the image information of second place P2 is low in order to the correlative value of the image information of judging the 4th position P4 for image analysing computer module 20.
If the correlative value of the image information of the 4th position P4 descends, then carry out step S705: the image information that captures a plurality of adjacent positions before, this position.
In one embodiment of this invention, if the correlative value of the image information of the 4th position P4 descends, this represents correct focusing position between the 4th position P4 and second place P2, the 4th position P4 is the summary focusing position, then zoom lens 10 captures the image information of a plurality of adjacent positions before the 4th position P4, further, the image information of the zoom lens 10 a plurality of adjacent positions of acquisition between the 4th position P4 and two position P2, each adjacent position fixed distance in fact wherein, this fixed range is decided according to the manufacturer of zoom lens 10, but the present invention is not as limit.
In one embodiment of this invention, if the correlative value of the image information of the 4th position P4 raises, then carry out step S712: second place P2 is made as reference position P0, and the 4th position P4 is made as second place P2, and changes displacement.
In one embodiment of this invention, if the correlative value of the image information of the 4th position P4 raises, then represent correct focusing position between the 4th position P4 and camera head 1, processing module 50 is made as reference position P0 with second place P2, the 4th position P4 is made as second place P2, and the 4th new position P4 and new second place P displacement apart increase first-class gap from or a geometric ratio distance, but the present invention is not as limit.In one embodiment of this invention, carry out step S712 of the present invention after, then repeating step S710.
By focusing method of the present invention and camera head, camera head is sowed discord every to capture the image information of a plurality of positions with non-isometric focusing earlier, and obtain a summary focusing position, sow discord every to find out correct focusing position with equidistant focusing according to the summary focusing position again; Since non-isometric focusing sow discord every with equal difference distance or geometric ratio apart from increase, therefore can find the summary focusing position fast, then sow discord every to find correct accurately focusing position with equidistant focusing again, can solve in the prior art, the focusing time disappearance of a specified duration excessively of using constant spacing and producing zoom lens every being all is sowed discord in focusing.
To sum up institute is old, and no matter the present invention everywhere all shows it totally different in the feature of known technology with regard to purpose, means and effect, earnestly asks the auditor to perceive, and grants quasi patent early, makes Jiahui society, and the true feeling moral just.Only it should be noted that above-mentioned many embodiment give an example for convenience of explanation, the present invention's interest field required for protection should be as the criterion so that the scope of claims is described naturally, but not only limits to the foregoing description.
Claims (12)
1. focusing method is used to have a camera head of a zoom lens, and this method comprises the following steps:
(a) detect an initial position of this zoom lens;
(b) capture the image information of this reference position, the image information of a primary importance and the image information of a second place by this zoom lens;
(c) judge that the correlative value of what person's image information is the highest among the image information of the image information of image information, this primary importance of this reference position and this second place;
(d) if the correlative value of the image information of this reference position is the highest, then find out a correct focusing position according to this reference position by this zoom lens; And
(e) if the correlative value of the image information of this primary importance is the highest, then by this zoom lens to sow discord every find out this correct focusing position away from this camera head with respect to this primary importance and with a non-isometric focusing.
2. focusing method as claimed in claim 1, wherein in step (b), this primary importance with respect to this reference position away from this camera head, and this second place with respect to this reference position near this camera head.
3. focusing method as claimed in claim 1, wherein step (e) also comprises the following steps:
(f) if the correlative value of the image information of this primary importance is the highest, then capture the image information of one the 3rd position by this zoom lens, wherein the 3rd position is away from this camera head, and with respect to this primary importance at a distance of a displacement;
(g) whether the correlative value of judging the image information of the 3rd position descends;
(h) if the correlative value of the image information of the 3rd position descends, then find out this correct focusing position according to the 3rd position; And
(i) if the correlative value of the image information of the 3rd position raises, then this primary importance is made as this reference position, the 3rd position is made as this primary importance, and repeating step (f), wherein this displacement increase first-class gap from or a geometric ratio distance.
4. focusing method as claimed in claim 1, wherein step (c) afterwards, also comprise step (j): if the correlative value of the image information of this second place is the highest, then by this zoom lens to sow discord every find out this correct focusing position near this camera head with respect to this second place and with this non-isometric focusing.
5. focusing method as claimed in claim 4, wherein step (j) also comprises the following steps:
(k) if the correlative value of the image information of this second place is the highest, then capture the image information of one the 4th position by this zoom lens, wherein the 4th position is near this camera head, and with respect to this second place at a distance of this displacement;
(l) whether the correlative value of judging the image information of the 4th position descends;
(m) if the correlative value of the image information of the 4th position descends, then find out this correct focusing position according to the 4th position; And
(n) if the correlative value of the image information of the 3rd position raises, then this second place is made as this reference position, the 4th position is made as this second place, and repeating step (k), wherein this displacement increase these gaps from or this geometric ratio distance.
6. focusing method as claimed in claim 3, wherein step (h) also comprises the following steps:
(o) capture the image information of a plurality of adjacent positions before the 3rd position by this zoom lens, wherein each adjacent position is in fact at a distance of a fixed range;
(p) use the image information of each adjacent position of algorithm computation and find out this correct focusing position.
7. focusing method as claimed in claim 5, wherein step (m) also comprises the following steps:
(q) capture the image information of this a plurality of adjacent positions before the 4th position by this zoom lens, wherein each adjacent position this fixed range in fact apart; And
(r) use the image information of this each adjacent position of algorithm computation and find out this correct focusing position.
8. focusing method as claimed in claim 3, wherein preceding in step (a), also comprise the following steps:
(s) judge whether to exist this correct focusing position and this correct focusing position whether not to change; And
(t) if do not exist this correct focusing position or this correct focusing position to change, then carry out step (a).
9. focusing method as claimed in claim 1, wherein this method is used for the continuous focal modes of a S0.
10. camera head comprises:
One zoom lens is in order to capture the image information of a plurality of positions;
One image analysing computer module is in order to the correlative value of the image information of analyzing these a plurality of positions;
A pair of defocus distance provides module, in order to provide a non-focusing equidistant and a fixed range sow discord every; And
One processing module electrically connects this zoom lens, this image analysing computer module and this focusing from module is provided;
By this, this processing module is controlled this zoom lens when carrying out a focusing action, this zoom lens is sowed discord every to capture the image information of a plurality of positions with this non-isometric focusing earlier, this image analysing computer module judges that at first the image information of this position of Xia Jianging is a summary focusing position after the correlative value of the image information of each position rises; Then sow discord every finding out a correct focusing position with this equidistant focusing according to this summary focusing position again.
11. camera head as claimed in claim 10, wherein this camera head also comprises:
One algoritic module electrically connects this processing module, and this algoritic module is in order to provide an algorithm and to calculate a correct focusing position;
Wherein, this zoom lens captures the image information of a plurality of adjacent positions before this summary focusing position, wherein each adjacent position is in fact at a distance of this fixed range, by this, this processing module is controlled this algoritic module and according to the image information of this algorithm and each adjacent position and find out this correct focusing position.
12. camera head as claimed in claim 10, wherein this camera head uses the continuous focal modes of a S0.
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| CN2010101192320A CN102193164A (en) | 2010-03-08 | 2010-03-08 | Focusing method and camera |
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| CN2010101192320A CN102193164A (en) | 2010-03-08 | 2010-03-08 | Focusing method and camera |
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| CN105450919A (en) * | 2014-07-18 | 2016-03-30 | 联想(北京)有限公司 | Image acquisition method and image acquisition device |
| CN105959533A (en) * | 2016-04-27 | 2016-09-21 | 维沃移动通信有限公司 | Focusing method and mobile terminal |
| CN107783250A (en) * | 2016-08-26 | 2018-03-09 | 昆山丘钛微电子科技有限公司 | Picture pick-up device quick focusing method with automatic focusing function |
| CN112367442A (en) * | 2020-10-29 | 2021-02-12 | 维沃移动通信有限公司 | Camera lens assembly and electronic equipment |
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| CN112367442A (en) * | 2020-10-29 | 2021-02-12 | 维沃移动通信有限公司 | Camera lens assembly and electronic equipment |
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Application publication date: 20110921 |