CN1652010A - Image taking apparatus for taking accuracy focusing image and its method - Google Patents
Image taking apparatus for taking accuracy focusing image and its method Download PDFInfo
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Abstract
The present invention relates to an image pick-up device for picking up non-misfocusing image and its method, in which the non-misfocusing image mode can utilize the exposure composition defined in the image pick-up device to calculate the range of depth of field under the iris diaphragm value, then can used the lenses with different focal lengths to continuously shoot several photographs whose depth distance range can be to infinite far from camera shortest focusing distance, so that it can ensure that in the continuously-shot photographs the photograph whose subject thing and background thing are clear and sharp can be obtained.
Description
Technical field
The present invention relates to the method for a kind of image capture unit and pick-up image, image capture unit and its method of burnt image do not lost in particularly a kind of acquisition.
Background technology
For general automatic focusing image capture unit, when carrying out the image capture of theme object (people, buildings or landscape), can be via the processor inside of image capture unit own, calculate need exposure value (EV; Exposure value) with filmed image.Generally speaking, also accurate at last via the exposure value that processor calculated in the image capture unit.But image capture unit also can't be judged voluntarily, user institute need picked image why (background or people), so only can judge the numerical value of focal length (focal length) with simple rule, to carry out the shooting of image, but tend to cause background clear, and the fuzzy photograph of front theme object.
Process flow diagram when as shown in Figure 1, representing that general automatic focusing device for filming image is taken.Square 101, when being illustrated in the other places tourism, selected local landscape or buildings are as background; Then square 102 is represented and please passerby be helped, or oneself takes and desire the photographed subject object; Square 103, expression focusing device for filming image automatically can start the function of automatic focusing when taking; Then, have two kinds of situations and take place after having taken, a kind of is square 104, and it is clear that captured theme object and background (landscape or famous buildings) are, and this is successful photograph.But, when coming out, photograph finds that the theme image loses burnt (square 105), promptly the image that photograph presented is unintelligible, has then lost souvenir and value for preservation.
Summary of the invention
In order to reduce the image of taking failure, in this automatic image capture device and method that provides a kind of acquisition not lose burnt image, utilize and take repeatedly the photograph that field depth partly overlaps, use when improving filming image the burnt problem of the mistake that is produced.
One of purpose of the present invention, be to provide a kind of acquisition not lose the device of burnt image, under an exposure value of fixing, use many images of different focal automatic shooting, when make taking important souvenir photograph, selection that can be by this pattern, and it is clear simultaneously and do not lose Jiao's photograph with background to photograph theme.
For reaching the above purpose, one embodiment of the invention, the automatic image capture device that provides a kind of acquisition not lose burnt image mode.In having automatic focusing camera, increase by one and do not lose burnt image mode.Do not lose burnt image mode, be according to the exposure combination that is determined in the image capture unit that originally had automatic focus function, the depth of field of calculating under this exposure value, again via the camera lens that uses different focal, take the number sheet photo continuously, including the depth of field that is connected all, its depth of field can by the shortest focusing of distance image capture unit to the focusing of infinity from.Therefore, can guarantee that the desirable theme object of photographer necessarily can be clear in the middle of the photograph of taking continuously.
Description of drawings
Fig. 1 is according to the disclosed image capture unit with automatic focusing of tradition, and the photographed subject object produces each flow chart of steps of fuzzy image;
Fig. 2 is disclosed embodiment according to the present invention, utilizes to have each flow chart of steps of the image capture unit that does not lose burnt image mode option;
Fig. 3 A to Fig. 3 C is disclosed embodiment according to the present invention, utilizes in the image capture unit and does not lose burnt image mode, takes and obtain simultaneously having the method for clear theme object and background object photograph;
Fig. 4 is the block schematic diagram according to a pick-up image device embodiment of the present invention.
Symbol description among the figure
11 users select the background that need take
13 start simultaneously and do not lose burnt image mode in the image capture unit
15 utilize the arithmetic processor of image capture unit itself, and comprise an image of theme object and background object according to the first focal length automatic pick-up, and obtain an exposure value simultaneously
17 image capture units are used present exposure value, calculate second focal length and second depth of field
19 according to not losing burnt image mode, and identical photographed subject object is taken several continuously have identical exposure value, but the image of the main body object of different focal
21 after the photograph flushing, can obtain at least one theme object photograph clearly
30 image capture units
32 theme objects
34 background objects
50 input medias
52 processors
54 storage devices
56 storage devices
58 controllers
60 lens group
62 shutters
64 apertures
When travel in 101 other places, selected local landscape or buildings are as background
102 please passerby help, or oneself take and desire the photographed subject object
103 focus device for filming image automatically when taking, and can start the function of automatic focusing
It is clear that 104 theme objects of taking and background (landscape or famous buildings) are, and this is successful photograph
It is burnt to find when 105 photographs develop that the theme image loses, and promptly unintelligible then having lost of the image that photograph presented commemorated value
Embodiment
Some embodiments of the present invention can be described in detail as follows.Yet except describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention do not limited, and its scope with claims is as the criterion.
According to present general automatic focusing capture device, when carrying out the shooting of object, after the calculating of process image capture unit processor inside, and process earlier, determine a suitable exposure value (EV; Exposure value).But at present general image capture unit itself there is no software and can judge that the theme that will take why, only can choose the theme object that will take by mode manually.Therefore, the shortcoming that is produced for (square 105) in the prior art, the present invention discloses a kind of method, in traditional image capture unit, lose burnt shortcoming to improve, also disclose a kind of image capture unit that does not lose burnt image mode that has simultaneously, when when taking pictures, select this not lose burnt image mode, can obtain the photograph of photographed subject object clearly.
Fig. 2 represents according to one embodiment of the invention, utilizes the process flow diagram with the image capture unit that does not lose burnt image mode option.Square 11, the expression user utilizes image capture unit, for example, the picture window on the automatic camera is found a view, selection the object that need take.In an embodiment, the object of required shooting comprises a main body object and a background object, in a preferred embodiment, the main body object is for example apart from the personage of camera closer locations, with the background object, for example, camera is than the mountain range or the buildings of distant positions automatically for distance, and distance between the two is very big, and right embodiment is not limited thereto kind of a situation.
Square 13, burnt image mode is not lost in the expression startup, and utilizes the image capture unit pick-up image, and so-called herein acquisition is meant to make image be embedded on the entity, for traditional camera, promptly is to make egative film photosensitive record image; For digital camera, promptly be that image is kept in or is stored in the internal memory.Moreover in this embodiment, owing to use automatic camera, therefore, the phase chance obtains a suitable exposure value according to its inner photometric system and calculation automatically.Generally speaking, exposure value is obtained by f-number and the computing of shutter value, for example sum operation.
Square 15, expression utilizes the arithmetic processor of image capture unit itself, and according to first object distance (camera lens that is image capture unit is to the distance between the background object), automatic pick-up comprises an image of theme object and background object, and corresponding this first focal length person uses first object distance and first depth of field (depth of field), and uses above-mentioned correct exposure value (EV simultaneously; Exposure value).Square 17, the expression image capture unit is used the exposure value of present image capture unit, calculate second focal length and second depth of field, wherein, second depth of field of second focal length and first depth of field of first focal length partly overlap, that is, use the focal length of the sharp image of second focal length acquisition to fall in first depth of field of first focal length, by first depth of field of first focal length part contain.
Then, square 19, expression is according to not losing burnt image mode, at identical photographed subject thing, and the background object continuously takes several and has identical exposure value, but the photograph of different focal, therefore, can obtain containing the whole depth of field of photographed subject object to the background object; At last, square 21 is illustrated in after the photograph flushing, can obtain at least one its photographed subject object and background object and be photograph clearly.
At Fig. 3 A to Fig. 3 C, be used for representing the disclosed preferred embodiment of the present invention, illustrate in image capture unit, utilize and do not lose burnt image mode, take and obtain having the method for clear theme object photograph.When travelling in the famous scenic spot, most visitor can select beautiful landscape, or famous buildings is as background object 34, souvenir when being used for taking photograph as tourism, at this moment, all can ask passerby to help usually, or take by user oneself.Is example with the Tokyo Tower as background object 34, image capture unit 30 is found a view to contain Tokyo Tower 34 object as a setting, and the people is as theme object 32, at this moment, the focusing of camera lens central authorities focuses usually in the Tokyo Tower 34, calculate suitable exposure value by the arithmetic processor in the image capture unit 30, for example aperture be 5.6 and shutter be 1/125 second.Its acquisition parameters such as Fig. 3 A are represented, and its b1 represents the distance of image capture unit 30 to 34 of backgrounds, are actual focusing for the first time from (object distance); A1 be the camera lens of image capture unit 30 to the distance between the theme object 32, i.e. the desired focusing of user from.Yet because actual focusing for the first time is from being b1, its depth of field D1 is only contained near 34 front and back, Tokyo Tower, and the main body object 32 of real desired shooting can smudgy Chu.
Because desired photographed subject object 32 whether clear, with focusing from the field depth distance dependent, wherein, the depth of field (depth of field) is after the expression focusing is finished, to present range distance clearly on egative film.Therefore, have when commemorating the photograph that is worth taking any one, particularly the landscape photograph wishes that all the depth of field is longer, make be taken theme object 32 and background object 34 can both be clear.Therefore, except the depth of field, aperture (aperture), lens focus (the focus length of lens) and focal length (focal length) all can influence the sharpness of photograph, wherein, the lens focus that uses is shorter, with the shot subject distance person far away of healing, its depth of field is longer.
Therefore, according to above-mentioned principle, desire solves the fuzzy problem of the theme object 32 of being taken, and can start not lose burnt image mode in the image capture unit 30 before photographed subject object 32.As shown in Figure 3A, image capture unit 30 is a1 with the distance of theme object 32, the focusing of image capture unit 30 first focal length lens that uses, and calculate under this exposure value, focusing this moment is from being, the camera lens of image capture unit 30 is to the first object distance b1 of background object Tokyo Tower 34, and its depth of field that contains is first depth of field D1.Then, with reference to Fig. 3 B, under identical exposure value, calculate and use second focal length, second focusing this moment is from b2, and its depth of field that contains is second depth of field D2.Be noted that this moment, the range bridges that corresponding second focusing of second depth of field D2 is contained from b2, or part is overlapped in the scope that the corresponding first object distance b1 of first depth of field D1 is contained.
Moreover, in this embodiment, use second focal length of camera lens short, promptly in the present embodiment, do not lose burnt image mode and carry out follow-up shooting towards the shorter focal length of use automatically than first focal length, so, remedy the depth of field loss of focusing when shortening of image capture unit 30 with the big depth of field of shorter focal length.So be not limited to this according to embodiments of the invention, can be selectively, if employed lens focus is shorter during the decision exposure value, then do not lose burnt image mode and carry out follow-up shooting towards using than long-focus automatically, also can use together than weak point or than long-focus and carry out follow-up shooting, and be not limited to the foregoing description.
By that analogy, Fig. 3 C represents the mode according to the above calculating different focal and the different depth of field, can obtain out the suitable focal length of n sheet photo.Count the Zhang Xiangtong exposure value in continuous shooting, but have the different focus distance b
nImage, wherein n is 1 to 5 time for continuously taking number of times, this moment, the depth of field was D
nBe noted that utilize present embodiment do not lose burnt image mode, corresponding its focusing of the depth of field of taking can be contained a1 from the scope that is contained continuously, so, must obtain at least one theme object 32 photograph clearly.In the present embodiment, the photograph number that must take, then be to decide according to the f-number that set at that time, generally be approximately 2 to 5 sheet photos.
With a real data is example, if the distance between the shooting body object 32 and the image capture unit 30 is 3 meters, distance between background object Tokyo Tower 34 and the image capture unit 30 is 40 meters, then can be when taking via the arithmetic processor computing in the image capture unit 30, obtain a suitable exposure value, its exposure value be combined as aperture be 4.0 and shutter be 1/60 second.Then, can obtain preceding depth of field Δ L according to following depth of field computing formula
1And back depth of field Δ L
2, both additions are depth of field Δ L:
ΔL
1＝(FδL
2)/(f
2+FδL)
ΔL
2＝(FδL
2)/(f
2-FδL)
ΔL＝ΔL
1+ΔL
2＝(2f
2FδL
2)/(f
4-F
2δ
2L
2)
Δ L wherein
1Be the preceding depth of field, Δ L
2For the back depth of field, Δ L be the depth of field, F be f-number, the f of camera lens be lens focus, L be focusing from and δ spread circular diameter (diameter ofpermissible circle of confusion) for allowing, wherein, preceding depth of field Δ L
1Be the distance of this background object 34 to a near point that is positioned at these background object 34 the place aheads, and back depth of field Δ L
2Be the distance of background object 34 to a far point that is positioned at these background object 34 rears.Allow the diffusion circular diameter, expression is when ability that the diffusion diameter of a circle can be distinguished less than people's naked eyes, and the image in this scope is to blur and unjustifiable, for example, when the camera lens of image capture unit was 4.35 millimeters (mm), it allowed that the diffusion diameter of a circle is approximately 0.035 millimeter.Therefore, according to above-mentioned formula, its preceding depth of field, the back depth of field and the depth of field can be expressed as when taking pictures continuously
ΔL
1，n＝(FδL
2)/(f
2+FδL)，n＝1～5
ΔL
2，n＝(FδL
2)/(f
2-FδL)，n＝1～5
ΔL
n＝ΔL
1，n+ΔL
2，n＝(2f
2FδL
2)/(f
4-F
2δ
2L
2)
The depth of field before wherein subscript 1 is represented, n represents the n time continuous shooting, therefore, Δ L
1, nRepresent the individual preceding depth of field of the n that calculates after the n time; The subscript 2 expression back depth of field, n represents the n time shooting continuously, therefore, Δ L
2, nCan be shown in after n the continuous shooting n the back depth of field that calculates, Δ L
nThe resulting whole depth of field when being illustrated in the n time shooting.
According to above computing formula, can obtain the first preceding depth of field Δ L
1,1It is 2.33 meters to 4.56 meters.But, because focusing from being 40 meters, then calculates the first preceding depth of field Δ L by above-mentioned formula
1,1Be 32.82 meters, the first back depth of field is Δ L
2,1Be 51.2 meters, then first depth of field is Δ L
1Be 84.02 meters, therefore, corresponding first focusing of first depth of field from scope between 7.1 meters to 91.2 meters, the main body object of taking because of desire 32 (is 3 meters apart from image capture unit 30) does not fall in this distance range, therefore, main body object 32 is smudgy.
Therefore, calculate according to above-mentioned depth of field formula, fixedly exposure value calculates focusing for the second time from the position that is 4 meters, can obtain the second preceding depth of field Δ L this moment
2,1Be 1.25 meters and the second back depth of field Δ L
2,2Be 3.37 meters, and obtain corresponding second focusing of second depth of field from scope between 2.74 meters to 7.36 meters.This distance range (2.74 meters to 7.36 meters) part previous distance range (7.1 meters to 91.2 meters) that overlaps wherein.The rest may be inferred, and focusing for the third time is from being 2.1 meters, depth of field Δ L before the 3rd
3,1Be 0.41 meter and the 3rd back depth of field Δ L
3,2Be 0.66 meter, thus the 3rd depth of field correspondence focusing for the third time from scope between 1.69 meters to 2.76 meters, and contain corresponding second focusing of second depth of field from distance range.Therefore, calculate, from for b1 (40 meters), b2 (4 meters) and b3 (2.1 meters) time, capture a sheet photo respectively in focusing in regular turn according to above-mentioned depth of field formula.This three sheet photo has identical exposure value, but is to use the photograph of different focal camera lens, still, can contain the shooting body object 32 to the depth of field most between the background object 34, can guarantee to have at least one to be photographed subject object 32 photograph clearly.
In addition, what deserves to be mentioned is, under different light condition (fine or overcast and rainy), the photometric system in the image capture unit can be according to the algorithm in the image capture unit, in the hope of the exposure value under the light condition at that time, at this moment, again according to different f-numbers, calculate the different depth of field under the different focal again, then, obtain a photographed subject object and background object again and be photograph clearly.
Fig. 4 is the block schematic diagram according to a pick-up image device embodiment of the present invention.In an embodiment, the pick-up image device generally comprises input media 50, processor 52, controller 58, storage device 54,56 and capture device, for example lens group 60, shutter 62, aperture 64 or the like.Input media 50 is the button or the option of function or pattern, and in present embodiment, input media 50 comprises one and do not lose burnt the mode option.Processor 52 is handled the information of input media 50 and controller 58, to carry out various computings or setting.In present embodiment, processor 52 comprises the reception one Request Processing pick-up image computing of not losing burnt the mode option.The acquisition parameter setting of controller 58 receiving processors 52, is for example selected the speed of required lens group 60, control shutter 62 and the size of control aperture 64 at the action and the time of control capture device.Storage device 56, for example egative film or internal memory, the image information that is captured in order to record.
Storage device 54, in order to store carrying out the readable program that does not lose burnt pattern, storage device 54 also can in be built in the memory storage that processor 52 had, cooperate storage device 54, processor 52 can be handled the computing execution and not lose the required parameters of burnt pattern, gives controller 58 again.According to above-mentioned, in case the user utilizes input media 50 to select not lose burnt pattern, the pick-up image device just can be taken many sheet photos according to computing automatically, to capture the photograph of focusing.
The above is preferred embodiment of the present invention only, is not in order to limit protection scope of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should be included in the scope of claims.
Claims (9)
1. the method for burnt image is not lost in an acquisition, it is characterized in that the method that burnt image is not lost in this acquisition comprises:
(a) provide a theme object and a background object;
(b) acquisition one first image, it comprises this theme object and this background object, and according to this background object have one first focusing from, wherein this first focusing is from a corresponding exposure value and one first depth of field;
(c) obtain one second focusing from, wherein this second focusing is to should exposure value and one second depth of field, and this second depth of field to should second focusing from distance range and this first depth of field to should first focusing from distance range the part overlapping is arranged;
(d) acquisition one second image, its comprise this theme object with based on this second focusing from; And
(e) with this second focusing from replace this first focusing from and repeating step (c) and step (d), up to the position of this theme object fall into this second depth of field to should second focusing from distance range in.
2. the method for burnt image is not lost in acquisition as claimed in claim 1, wherein, above-mentioned first depth of field by this first focusing from, the depth of field and the one first back depth of field are tried to achieve before one first.
3. the method for burnt image is not lost in acquisition as claimed in claim 2, and wherein, the above-mentioned first preceding depth of field is the distance of this background object to one first near point that is positioned at this background object the place ahead.
4. the method for burnt image is not lost in acquisition as claimed in claim 2, and wherein, the above-mentioned first back depth of field is the distance of this background object to one first far point that is positioned at this background object rear.
5. the method for burnt image is not lost in acquisition as claimed in claim 1, wherein, above-mentioned second depth of field be by this second focusing from, the depth of field and the one second back depth of field are tried to achieve before one second.
6. the method for burnt image is not lost in acquisition as claimed in claim 5, and wherein, the above-mentioned second preceding depth of field is the distance of this background object to one second near point that is positioned at this background object the place ahead.
7. the method for burnt image is not lost in acquisition as claimed in claim 5, and wherein, the above-mentioned second back depth of field is the distance of this background object to one second far point that is positioned at this background object rear.
8. the image capture unit of burnt image is not lost in an acquisition, it is characterized in that, comprises:
One input media does not lose burnt image option in order to import one;
One storage device is in order to store the program that several do not lose burnt image option;
One processor, according to this do not lose burnt image option and these several do not lose the program of burnt image option, an order of not losing burnt image option is carried out in output, wherein this order comprises:
Capture several images, the corresponding exposure value of these several images, arbitrary this image comprise a theme object and a background object with based on a pair of defocus distance, each this focusing is from a corresponding depth of field, wherein each this depth of field to should focusing from a distance range, with other this depth of field to should other focusing from a distance range have part to overlap, the position of this theme object falls into arbitrary this depth of field, corresponding this focusing from distance range in;
This order is carried out in one pick-up image unit; And
One controller receives this order and controls this pick-up image unit according to this order.
9. the image capture unit of burnt image is not lost in acquisition as claimed in claim 8, and wherein, this storage device in order to store several readable programs, makes an image capture unit several images of acquisition continuously, and these several readable program control capture device is carried out the following step:
(a) acquisition one first image, it comprises a theme object and a background object, and according to this background object have one first focusing from, wherein this first focusing is from a corresponding exposure value and one first depth of field;
(b) obtain one second focusing from, wherein this second focusing is to should exposure value and one second depth of field, and this second depth of field to should second focusing from distance range, with this first depth of field to should first focusing from distance range the part overlapping is arranged;
(c) acquisition one second image, its comprise this theme object with based on this second focusing from; And
(d) with this second focusing from replace this first focusing from and repeating step (b) and step (c) up to the position of this theme object, fall into this second depth of field to should second focusing from distance range in.
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| CN103561205B (en) * | 2013-11-15 | 2015-07-08 | 努比亚技术有限公司 | Shooting method and shooting device |
| CN103561205A (en) * | 2013-11-15 | 2014-02-05 | 深圳市中兴移动通信有限公司 | Shooting method and shooting device |
| TWI627487B (en) * | 2014-05-16 | 2018-06-21 | 宏達國際電子股份有限公司 | Handheld electronic apparatus, image capturing apparatus and image capturing method thereof |
| CN105068360A (en) * | 2015-09-17 | 2015-11-18 | 广东欧珀移动通信有限公司 | Continuous shooting method and continuous shooting system |
| CN105282443A (en) * | 2015-10-13 | 2016-01-27 | 哈尔滨工程大学 | Method for imaging full-field-depth panoramic image |
| CN105282443B (en) * | 2015-10-13 | 2019-06-14 | 哈尔滨工程大学 | A kind of panorama depth panoramic picture imaging method |
| WO2018032565A1 (en) * | 2016-08-17 | 2018-02-22 | 江浩 | Method for obtaining specimen image under microscope, imaging device and method thereof for obtaining specimen image |
| CN106651870A (en) * | 2016-11-17 | 2017-05-10 | 山东大学 | Method for segmenting out-of-focus fuzzy regions of images in multi-view three-dimensional reconstruction |
| CN106651870B (en) * | 2016-11-17 | 2020-03-24 | 山东大学 | Segmentation method of image out-of-focus fuzzy region in multi-view three-dimensional reconstruction |
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