CN101813867A - Half TTL (Through The Lens) reflector-free phase comparison focusing digital camera system - Google Patents
Half TTL (Through The Lens) reflector-free phase comparison focusing digital camera system Download PDFInfo
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Abstract
The invention relates to a half TTL (Through The Lens) reflector-free phase comparison focusing digital camera system which carries out framing and exposure parameter detection through a main lens and a main image sensor and carries out phase comparison focusing together with an auxiliary lens and an auxiliary image sensor. On the premise of not using a reflector, the TTL structure and a phase comparison focusing technology are organically combined in the digital camera system, thereby overcoming the defects of larger vibration, sound and volume, and the like caused by a reflecting unit, and meanwhile, the system can have the focusing speed of a traditional automatic focusing single-lens reflex camera and provide various types of novel focusing functions.
Description
Technical field
The invention belongs to the camera arrangement field in the camera work.Be specifically related to how to improve camera focusing technology to develop compact high digital performance camera.
Background technology
Most practical cameras all must have the function of adjusting focusing (distance between adjustment camera lens and the camera plane is so that subject blur-free imaging on camera plane) according to the distance of captured object.The physically measurable amount parameter of utilizing during the camera focusing generally has two kinds: picture contrast and imaging phase place.The principle of utilizing picture contrast focusing be according to imaging when clear the contrast of general pattern will reach peaked characteristics and carry out.The imaging phase place is meant the relative position of subject on imaging plane.The imaging phase place of same object in the lens combination of two certain lateral separations of being separated by (range finding baseline) is different, and relatively these two imaging phase places just can directly obtain the range information of subject to finish focusing.The physical basis of this method and binocular stereo vision is identical.
Most of digital cameras be earlier by camera lens (being TTL, Through The Lens) with imageing sensor find a view, operations such as exposure parameter measurement, focusing, take with same imageing sensor after finishing.Has simple, the reliable advantage of focusing of hardware configuration.Its shortcoming is to implement the picture contrast focusing.In focus process, need repeatedly focus with the search maximum-contrast, so speed is slower.
Single-lens reflex is a kind of important camera system structure.This structure utilized reflective mirror, optical finder and independent optical sensor to carry out operations such as TTL finds a view, exposure parameter measurements, focusing before taking, and reflective mirror overturns and shifts out light path so that all light quantities by camera lens are incident upon on film or the key light sensor takes during shooting.The TTL structure is highly suitable for the interchangeable lens camera, all can show the picture that will take strictly according to the facts in optical finder with the camera lens of what focal length.Optical finder also has fast and the high advantage of resolution.More outstanding is take before splitting in camera lens and the optical finder constitute as prism or focusing sensing module and to be equivalent at a distance of suitable two similar lens combinations of range finding baseline, therefore can implement TTL phase comparison focusing artificial or electronics.Because phase comparison focusing middle distance information directly obtains, so the single-lens reflex camera focusing speed of focusing automatically is very fast.These characteristics make the single-lens reflex structure be adopted by most high-performance films and digital camera system.
Characteristics of TTL phase comparison focusing are that aperture one that its equivalence range finding baseline uses when range finding regularly is that focal length along with camera lens increases and prolongs.Its equivalence range finding baseline is also long when camera uses long focal length lens, thereby can satisfy the required higher distance accuracy of long focal length lens adaptively.
The single-lens reflex structure also has the weakness of himself.Reflective mirror rotary movement during shooting can produce the bigger vibrations and the sound, influences the shooting clear degree and in the use of some quiet occasion.The more important thing is owing to must behind camera lens, reserve and place and the space of upset reflective mirror, not only increase the camera volume, make that also imaging plane must be away from the camera lens trailing edge, the design of camera lens (particularly wide-angle lens) has been produced restriction.
Automatically using a kind of phase comparison focusing system that does not pass through camera lens that forms by two simple attachment lens systems of cover and photo-detector on the focusing film camera.But this system can not organically combine with the TTL structure, therefore can only carry out better simply automatic focusing operation, is not used in digital camera.
Current camera had begun according to the characteristics of digital camera the weakness of single-lens reflex structure to be improved already.Olympus and PANASONIC have been issued miniature 4/3 interchangeable lens camera system (the Micro Four Thirds) standard of reflector-free, and PANASONIC has been issued the DMC-G1 digital camera that meets this standard again.Miniature 4/3 system utilizes electronic viewfinder to substitute optical finder to cancel reflective mirror, be able to mirror image nearly 50% apart from having shortened, therefore can littler camera lens and the camera of design volume.Because the electronic viewfinder development of technology, its performance will be progressively near optical finder.But the ripe camera lens reflector-free phase comparison focusing technology of pass through also appears now, the employing of PANASONIC DMC-G1 digital camera be picture contrast focusing technology.But the restriction on the physical arrangement makes picture contrast focusing speed can not directly satisfy many application of having relatively high expectations, and as not solving the development of this class reflector-free camera system is severely limited.
This patent will be set forth can realize also doing behind the cancellation camera lens reflective mirror digital camera system structure of phase comparison focusing.Adopt this structure can make the novel digital camera that volume is little, performance is high, powerful.
Summary of the invention
Key problem in technology of the present invention is to constitute the phase comparison focusing system with attachment lens and graphical sensory device system together with the main lens and the master map type sensor of camera.
This invention is very direct technically.If add one again and be with the auxiliary focusing module that attachment lens and imageing sensor are formed in that the main lens of camera is other, just relatively the imaging phase place of these two optical systems can directly obtain object distance information and finish range finding.
If be used for the interchangeable lenses camera, can use attachment lens to cover the focal range of replaceable camera lens commonly used with suitable focal length variations scope.The camera lens of modern digital cameras and image sensor technologies developed into can be very low cost in very little volume, settle the imageing sensor of high performance zoom lens and ten million Pixel-level.Use the card digital camera of periscopic zoom lens on market, to occur in a large number.One of configuration and even a plurality of such auxiliary focusing module are unquestionable on the digital camera of the big picture of high-performance.The miniature high-speed computer system of being researched and developed for the modern digital cameras system is also for realizing that this structure provides the necessary processing ability.
Different with the complete TTL phase comparison focusing of single lens reflex camera system with the complete non-TTL phase comparison focusing of paraxonic camera system (as Lycra M series camera), structure of the present invention has promptly been used by the image information of main lens and has been used the image information that adds attachment lens by other again, therefore can be known as half by camera lens phase comparison focusing structure.
Accompanying drawing is a most basic use camera system of the present invention, is overlapped by forming at a distance of the attachment lens (3) of the baseline (B) of finding range and auxiliary focusing module, Computer Processing control module (5) and the electronic viewfinder (6) that assistant images sensor (4) is formed with main lens by main lens (1) and master image sensor (2).The detectable signal of master image sensor also can be used for finding a view except can be used for shooting, exposure parameter is measured and focusing control.Owing to all providing focusing in the scope that not be used in silent frame usually, the focal length of attachment lens needn't be provided with equally with main lens fully.
By find a view with main lens and master image sensor, exposure parameter detects and carry out phase comparison focusing together with attachment lens and assistant images sensor, the present invention organically combines TTL structure and phase comparison focusing technology under the prerequisite of not using reflective mirror.Not only avoided bigger vibrations, sound and volume that the reflective mirror unit causes or the like defective, can have the tradition focusing speed of focusing single lens reflex camera automatically simultaneously, and have more flexibility in the selection of focusing position and quantity.
Comparing also and might improve with single lens reflex camera aspect the precision and the low light level focusing sensitivity of focusing.All light quantities by main lens and attachment lens can both be used to range finding, and the pixel quantity of master image sensor and assistant images sensor can be higher than the sensor that uses in the single lens reflex camera Focusing module far away.
In addition the digital technology of many novelties also can be applied.
A possible application is that facial recognition techniques can be united use with phase comparison focusing at an easy rate.
Another may be with picture contrast focusing and phase comparison focusing combination.Rate request is being done like this reliability that can improve focusing when not high.Can also focus auxiliary phase relatively to focus to carry out automatic or manual scale operation with picture contrast, precision and reliability when improving independent use phase comparison focusing.
Because the use of electronic viewfinder, the demonstration of focusing information also can be more flexible.Not only can accurately show focusing zone and selected focusing, the part picture of auxiliary pattern sensor of can also superposeing on the picture of master map type sensor splits the display effect of picture formula view finder to obtain being similar to find a view camera or prism of paraxonic, and very attractive and high efficiency manual focus pattern can also be provided like this.
This patent also can promote the development of camera technique.Modern digital cameras can provide the video capture ability of practical value.The EOS 5DII camera of Canon Inc. even full HD camera function can be provided.As use this patent and then can under image pickup mode, provide stronger automatic focusing ability, quicken the fusion of shooting and camera work.
Owing to be the phase comparison focusing of half TTL, can lose the advantage of some full TTL system, but also can bring some other advantage.And because this patent structure can make full use of the powerful ability of reconfiguring of digital processing technology, many brand-new utility functions can obtain implementing.
Unless provide by the camera lens electrical interface, full TTL system can not be singly obtains the information of lens focus in the detectable signal of focusing sensor.Full TTL system does not often influence the focusing performance because there being camera lens real focal length value when main lens uses preposition attachment optical system.And this half TTL system side can obtain the real focal length value of main lens by the detectable signal analysis to master image sensor and assistant images sensor.This information can be used to improve the performance of focus algorithm.
When using bigger heavy caliber of volume ratio or telephoto lens, different with full TTL system, camera lens might stop the visual angle of auxiliary focusing camera lens.One of method of alleviating this restriction is to use the auxiliary focusing module that can eject to be blocked by macro lens avoiding, simultaneously since the increase distance accuracy of range finding base length also can be improved.
If use an auxiliary focusing module, then will have only a range finding baseline, the bit comparison of imaging phase will be only to the vertical striped sensitivity of this range finding baseline.As all responsive, can in some high-grade camera systems, adopt two auxiliary sensing modules to the striped of all directions.Another possible scheme be with another auxiliary focusing modular design to an auxiliary handle of camera, add upper handle when needing and just can improve range performance.
The length of the equivalence of half TTL system range finding baseline can be along with lens focus increases and increases as full TTL system.But the length of the equivalence of common half TTL system range finding baseline can be designed to be maximum caliber greater than most camera lenses to guarantee the focusing precision.Also can design and be attached to having than the special-purpose Focusing module of growing range finding baseline and superior performance auxiliary focusing camera lens on the long focal length lens to improve the focusing precision of long focal length lens.
Because factor that the self-adaptation to telephoto lens, social owning amount that the difference of electronic viewfinder and optical finder, full TTL phase comparison focusing system are had are big or the like, single-lens reflex structure camera will still be used very over a long time.Use novel camera of the present invention can ingeniously utilize this phenomenon progressively to enlarge the range of application of oneself.
A possible approach is the camera lens group compatibility that makes new camera system and existing single-lens reflex structure camera.Way is the short camera lens trailing edge of definition to the distance of master image sensor and less bayonet socket diameter to give full play to the advantage of reflector-free structure preferably, keeps certain compatibility to make former specification camera lens to insert the use of new system easily by an additional adapter ring simultaneously.Just can obtain the support of existing camera lens group resource when so new system brings into use, manufacturer has also kept the selection of researching and developing the novel camera lens of giving full play to the reflector-free structural advantage.Manufacturer and consumer will acquire benefit by the expansion of range of choice like this, will help very much the universal development of new system.
Comprehensive, use this patent invention half by camera lens reflector-free phase comparison focusing structure can make full use of the numeral of current develop rapidly and electronic technology design small volume and less weight and focusing performance good digital camera.
Description of drawings
Ultimate system.
Claims (10)
1. one kind can wherein comprise with the digital camera system of digital form recording optically image
Main lens and master image sensor with superior performance;
One cover or a cover above with the auxiliary focusing module by more small-bore attachment lens and assistant images sensor formed of main lens system at a distance of certain range finding parallax range;
Signal Processing and control microcomputer system; And
Show the electronic viewfinder of finding a view with image and control information; It is characterized in that
Between main lens and the master image sensor find a view need not use reflective mirror and master image signal of sensor can be used to measure with the acquisition parameters measuring phases by the finding a view of camera lens mode, acquisition parameters and last image exposure in provide heat transfer agent with attachment lens together with the assistant images sensor again so that camera can be implemented the range finding of bit comparison mutually focusing.
2. digital camera system as claimed in claim 1 is characterized in that
The ultimate system of forming by auxiliary focusing module, Computer Processing control module (5) and the electronic viewfinder (6) formed at a distance of the attachment lens (3) and the assistant images sensor (4) of a range finding baseline (B) with main lens by main lens (1) and master image sensor (2), a cover.
3. as the digital camera system of claim 1, it is characterized in that
Unite facial recognition techniques and the phase comparison focusing technology used.
4. as the digital camera system of claim 1, it is characterized in that
Unite and use picture contrast focusing and phase comparison focusing to focus automatic or manual calibration is carried out in the phase comparison focusing system supplymentary with the speed that improves focusing simultaneously and reliability and with picture contrast.
5. digital camera system as claimed in claim 1 is characterized in that
The part picture of stack auxiliary pattern sensor obtains being similar to the paraxonic display effect that camera or prism split as the formula view finder of finding a view and shows so that efficient automatic or manual focusing information to be provided on the master map type sensor frames that electronic viewfinder shows.
6. digital camera system as claimed in claim 1 is characterized in that
The two cover auxiliary focusing modules that employing has non-parallel range finding baseline all are embodied as the bit comparison of picture phase with the image striped to all directions.
7. digital camera system as claimed in claim 1 is characterized in that
Use can eject or be installed on auxiliary handle or the camera lens the auxiliary focusing module with avoid the visual angle by the bigger camera lens of volume block, increase the range finding base length with improve distance accuracy, implement multidirectional image striped imaging phase bit comparison and can adopt larger caliber and than the attachment lens of long-focus to improve the focusing precision of telephoto lens.
8. digital camera system as claimed in claim 1 is characterized in that
Can under image pickup mode, provide and implement phase bit comparison range finding focusing.
9. digital camera system as claimed in claim 1 is characterized in that
The lens interface of the camera lens group compatibility of design and existing single-lens reflex structure camera is so that the novel photographing machine can obtain the support of existing camera lens group resource in the initial development stage.
10. digital camera system as claimed in claim 9 is characterized in that
The short camera lens trailing edge of definition to the distance of master image sensor and less bayonet socket diameter when utilizing newly-designed special lens to give full play to the reflector-free structural advantage, can insert the use of new system easily by the single-lens reflex structure camera lens that an additional adapter ring will have specification now.
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| CN200910009354A CN101813867A (en) | 2009-02-20 | 2009-02-20 | Half TTL (Through The Lens) reflector-free phase comparison focusing digital camera system |
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| CN200910009354A CN101813867A (en) | 2009-02-20 | 2009-02-20 | Half TTL (Through The Lens) reflector-free phase comparison focusing digital camera system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016049889A1 (en) * | 2014-09-30 | 2016-04-07 | 华为技术有限公司 | Autofocus method, device and electronic apparatus |
| CN105573018A (en) * | 2015-12-22 | 2016-05-11 | 上海集成电路研发中心有限公司 | True digital paraxial structure, camera and macula focusing method |
| CN105814875A (en) * | 2013-12-06 | 2016-07-27 | 谷歌公司 | Selecting camera pairs for stereoscopic imaging |
| TWI547749B (en) * | 2015-05-22 | 2016-09-01 | 齊發光電股份有限公司 | Focus system and method |
| CN106603911A (en) * | 2016-11-29 | 2017-04-26 | 广东欧珀移动通信有限公司 | Control method, control apparatus, and electronic apparatus |
| CN111263059A (en) * | 2020-01-19 | 2020-06-09 | 上海海鸥数码照相机有限公司 | Manual focusing shooting method and device for lens-exchangeable paraxial camera |
| CN112866548A (en) * | 2019-11-12 | 2021-05-28 | Oppo广东移动通信有限公司 | Phase difference acquisition method and device and electronic equipment |
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2009
- 2009-02-20 CN CN200910009354A patent/CN101813867A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105814875A (en) * | 2013-12-06 | 2016-07-27 | 谷歌公司 | Selecting camera pairs for stereoscopic imaging |
| WO2016049889A1 (en) * | 2014-09-30 | 2016-04-07 | 华为技术有限公司 | Autofocus method, device and electronic apparatus |
| US10129455B2 (en) | 2014-09-30 | 2018-11-13 | Huawei Technologies Co., Ltd. | Auto-focus method and apparatus and electronic device |
| US10455141B2 (en) | 2014-09-30 | 2019-10-22 | Huawei Technologies Co., Ltd. | Auto-focus method and apparatus and electronic device |
| TWI547749B (en) * | 2015-05-22 | 2016-09-01 | 齊發光電股份有限公司 | Focus system and method |
| CN105573018A (en) * | 2015-12-22 | 2016-05-11 | 上海集成电路研发中心有限公司 | True digital paraxial structure, camera and macula focusing method |
| CN105573018B (en) * | 2015-12-22 | 2018-08-10 | 上海集成电路研发中心有限公司 | Antilog code paraxonic structure, camera and macula lutea focusing method |
| CN106603911A (en) * | 2016-11-29 | 2017-04-26 | 广东欧珀移动通信有限公司 | Control method, control apparatus, and electronic apparatus |
| CN112866548A (en) * | 2019-11-12 | 2021-05-28 | Oppo广东移动通信有限公司 | Phase difference acquisition method and device and electronic equipment |
| CN112866548B (en) * | 2019-11-12 | 2022-06-14 | Oppo广东移动通信有限公司 | Phase difference acquisition method and device and electronic equipment |
| CN111263059A (en) * | 2020-01-19 | 2020-06-09 | 上海海鸥数码照相机有限公司 | Manual focusing shooting method and device for lens-exchangeable paraxial camera |
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Application publication date: 20100825 |