CN102096174B - System and method for executing automatic focusing in low-brightness scene - Google Patents
System and method for executing automatic focusing in low-brightness scene Download PDFInfo
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- CN102096174B CN102096174B CN200910252444A CN200910252444A CN102096174B CN 102096174 B CN102096174 B CN 102096174B CN 200910252444 A CN200910252444 A CN 200910252444A CN 200910252444 A CN200910252444 A CN 200910252444A CN 102096174 B CN102096174 B CN 102096174B
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Abstract
The invention relates to a system and method for executing automatic focusing in a low-brightness scene, which can achieve the purpose of accurate and instant image automatic focusing through the selection of memory bits and a procedure of tone adjustment particularly under the condition of low-brightness scene shooting. The method in the embodiment comprises the following steps of: obtaining a digital image signal through a lens module and a sensitization element; then gaining and adjusting the digital image signal by utilizing a gaining and adjusting unit and then reducing noise; retrieving the data of a plurality of memory bits in the signal by utilizing a memory bit retrieving unit so that useless data bits can be removed; and then executing a tone adjusting step to generate an accurate instant image automatic focusing effect through improving the contrast of the digital image signal.
Description
Technical field
The present invention relates to a kind of low-light level scene and carry out the System and method for of focusing automatically, particularly when the low-light level scene is taken, reach the accurately instant image technology of focusing automatically through choosing of memory position (bit) and tone adjustment.
Background technology
Automatically (Automatic Focusing focuses; Abbreviation AF) technology lets camera or video camera find range in the specific region; And then the adjustment camera lens is in a focal length (focal length); Obtain distinct image, this has been indispensable important document for the digital camera of general consumer or video camera.
The mode of general manual focus (MF) is to be utilized the sharpness of focusing screen (focusing screen) adjustment image wherein in picture window (viewfinder) by the user; It mainly is the distance between adjustment egative film or photo-sensitive cell and lens set; Just so-called focal length; Let image exactly projection on egative film or photo-sensitive cell, also let the user see distinct image in picture window.
And automatically focusing has several kinds of modes, is divided into passive type and active two kinds, is applied to equally on the digital camera or video camera of present consumer.
Passive type focusing automatically is applied to some automatic cameras, and it is by means of the shift position of the reflective analytical calculation lens set of object, if under the environment of insufficient light; Then usually use the auxiliary focusing lamp, when focusing, can get a branch of color of light like some cameras; Running into the subject back reflection returns; Can access enough reflectively, and then analyze focal length, control the position of lens set according to this.
Another Autofocus Technology then is to send ultrasonic or infrared ray by camera or video camera itself, utilizes the calculated signals distance by the object reflection, comprises using the dealing time or utilizing reflection angle to draw the object distance, and then adjusts self focal length.
Along with scientific-technical progress; Except known automatic focusing mode; More there are camera or video camera (to capture as passing through imageing sensor through the view picture of instant acquisition; And in the picture of lcd screen preview) carry out automatic focusing program, this just instant image is focused (Live View focuses automatically) automatically, can in the time of instant preview, accomplish composition and focusing automatically.The autofocus system that wherein is applied in the camera adopts the powerful processor of image-capable, through the image definition computing, can compare image and fast searching focus by the imageing sensor acquisition immediately.
Fig. 1 is the automatic focusing program of known technology; Automatically focusing mainly is to move focus lens (step S101) through step motor (stepping motor); When moving to an ad-hoc location, through camera lens acquisition image frame (step S103), and in the preset above-mentioned focusing screen of several position point calculating the sharpness of object; Draw relative focal length (step S105) simultaneously; Judge whether at this moment enough data (step S107), if not, expression also will continue to carry out through motor moves steps such as focus lens, acquisition image, calculating sharpness; If yes, then then in these several preset positions, estimate position, promptly get the most clearly focusing position (step S109) of image of sening as an envoy to utmost sharpness.Move afterwards on lens set (lens group) to the best focal length (step S111), accomplish the program of focusing automatically.
In the technology of the image calculation sharpness that above-mentioned utilization captures, it possibly be the image of enough brightness that the image in order to focusing is provided, and can access comparatively accurate focal length, but also possibly be darker image, and let focusing produce coarse problem.
Fig. 2 is the circuit block diagram in the digital camera in the known technology.The main element in the display digit camera wherein; The circuit that mainly includes AWB, automatic exposure in this routine camera and focus automatically, camera utilizes camera lens 20 photographic images, receives and convert into digital signal by image sensor 21; After image pre-process unit 22 is handled; The 23 adjustment colour temperatures through the AWB unit are carried out preview, shooting afterwards behind image-signal processor 24, or store images.In the process of acquisition image, still need to find exposure value through automatic exposure unit 27, obtain correct image-forming range through automatic focusing unit 28, these information are through motor driver 29 controls lens motors, with the image of correctly being focused.
In addition, handle in the process of image, comprise from photo-sensitive cell acquisition image beginning; To Flame Image Process, preview to storing, during memory style also possibly capture the value of high bit because of hardware designs, make the degree of accuracy decline of focusing; Especially in the low-light level scene; Can lose image detail because of the acquisition high bit,, more influence the degree of accuracy of focusing except noise increases.
Summary of the invention
The technical matters that the present invention will solve mainly is in general digital camera or video camera, an autofocus system to be set; Special under the low-light level scene; Utilize the mode of instant image focusing can cause the inaccurate problem of focusing; Can reach the effect of accurate focusing through the means of adjusting with tone of choosing of memory position.
Because imageing sensor will have the function of automatic focusing, especially, just must adjust focal length via searching the information of lens location (adjustment image-forming range) with image definition to the mode of instant image focusing, obtain distinct image.
Wherein one of embodiment comprises and utilizes a camera lens module photographic images, and then by photo-sensitive cell, like CCD or CMOS, sensitization produces data image signal, afterwards, and can be through the yield value of gain adjusting unit adjustment data image signal, with the reduction noise.Because the image by the photo-sensitive cell acquisition has higher memory place value, then can can't store original memory place value because of the restriction of hardware, the present invention captures the data of effective a plurality of memories position through a memory position acquisition unit.
Then; Introduce the whole unit of key of the same colour and carry out the tone set-up procedure, can be amplified to a scope with effectively remembering place value, to improve the contrast of data image signal; Produce a focusing image thus; Calculate the sharpness of focus image again through the focusing unit, and adjust camera lens module automatically, take to carry out according to a focal length.
In addition; Because the present invention is applied to the shooting environmental of low-light level scene; So can introduce exposure value that produces by automatic exposure unit (auto exposure) and the threshold value of judging the brightness height; After judging, when environmental treatment low-light level scene, promptly repeat above-mentioned steps and reach the accurately instant image purpose of focusing automatically.
The present invention provides a kind of and carries out the system of focusing automatically in the low-light level scene, is applied to the shooting of a low-light level scene, and described system includes: a camera lens module, in order to take an image; One photo-sensitive cell links this camera lens module, and with converting data image signal after this image sensitization into; One gain adjusting unit links this photo-sensitive cell, and will be to reduce noise after this data image signal gain adjustment that this photo-sensitive cell produces; One memory position acquisition unit links this gain adjusting unit, in order to the data of a plurality of memories position in the data image signal of acquisition after reducing noise; Key of the same colour is put in order the unit, links to remember the position acquisition unit, and is rapid in order to this data image signal after reducing noise is carried out key synchronizing of the same colour, the contrast that improves this data image signal thus; One focusing image generation unit is to link this tone adjustment unit receiving this data image signal through the tone adjustment, and is converted into a focusing image; And a focusing unit, link this focus image generation unit and this camera lens module, this focusing unit calculates the sharpness of this focus image earlier, again according to one can make this focus image clearly focal length adjust this camera lens module automatically, continue to carry out and take.
In addition, the present invention also provides a kind of and carries out the method for focusing automatically in the low-light level scene, and described method comprises: capture an image through a camera lens module, and be data image signal through a photo-sensitive cell with this image transitions; Exposure value according to an automatic exposure program produces is judged the lightness of this image, if belong to a low-light level scene, promptly adjusts the yield value of this photo-sensitive cell, to reduce the noise of this data image signal that produces through this photo-sensitive cell; A plurality of memories position of this data image signal of selectivity acquisition; Adjust this tone, the contrast that improves this data image signal thus through the data image signal of selection; And utilize the data image signal after the abovementioned steps adjustment to make this camera lens module carry out focusing automatically.
Description of drawings
Fig. 1 is the process flow diagram of the automatic focusing program of known technology;
Fig. 2 is the circuit block diagram in the digital camera in the known technology;
Fig. 3 a-Fig. 3 c is the view of memory position in each stage;
Fig. 4 carries out the circuit block diagram of the system of focusing automatically for the present invention in the low-light level scene;
Fig. 5 carries out the integrated circuit calcspar of the system of focusing automatically for using the present invention shown in Figure 4 in the low-light level scene;
Fig. 6 is the corresponding curve of tone adjustment;
Fig. 7 carries out the method flow diagram of automatic focusing for the present invention;
Fig. 8 carries out the method flow diagram of focusing automatically for the present invention in the low-light level scene.
[main element description of reference numerals]
22 AWB unit 23, image pre-process unit
Image-signal processor 24 automatic exposure unit 27
Automatic focusing unit 28 motor drivers 29
Gain adjusting unit 42 memory position acquisition units 43
Image display processing unit 46 focus image generation units 47
Focusing unit 48 display units 49
Embodiment
The technology of automatic immediate image focusing technology through focusing by camera lens, the captured image of photo-sensitive cell; At digital camera or video camera during facing to image taking; The CD-ROM drive motor of camera lens promptly moves earlier focus lens; In the sharpness of specific several position point computed image, search obtains the clear sharp keen images of positions of focusing automatically.Automatically search for one of the processes, the continuous calculation of the focus area edge sharpness, and looking for the maximum position of the image edge sharpness and resolution methods commonly used spatial Sobel spatial filter and Laplacian filter, etc., but the present invention is not limited to these methods.
When general pattern captures; Because the design (cost consideration is arranged usually) on the hardware in the process of Flame Image Process, usually can lose the details of some images; And it has been very low in the brightness of image of low-light level scene; And the noise of image is very big, so have influence on the degree of accuracy of focusing easily, the memory position shown in Fig. 3 a-Fig. 3 c is in the view in each stage.
Among Fig. 3 a, Fig. 3 a is shown as by lens shooting, photo-sensitive cell and converts data image signal into, gets into the memory place value behind the graphics processing unit, and this example is 12, and just data image signal has 212 data.And in after through Flame Image Process, store (or temporary) in memory media, at this moment, stored value possibly become 10 that Fig. 3 b shows, just data become 210.
Then, more possible because will produce the instant picture that is used to focus, and reduce the quality of instant image again, shown in Fig. 3 c, become 8 data.
At this moment; The present invention proposes a kind of low-light level scene and carries out the System and method for of focusing automatically; Particularly be applied to the shooting environmental of low-light level scene, to the above-mentioned problem that possibly lose image detail in the entire image processing process, through choosing effective memory position; Program with the tone adjustment produces preferable focus image.
See also the circuit block diagram in the system that the execution of low-light level scene is focused automatically shown in Figure 4; Wherein be shown as the focusing system that the present invention discloses; Wherein use an image processing module 400 and carry out the optimization of instant image, promote focusing ability through instant image.
Wherein, utilize a camera lens module 40 photographic images, camera lens module 40 forms with a set of contact lenses group; Can be through wherein focus lens being focused; Behind the image taking, by one be linked to camera lens module 40 photo-sensitive cell 41 acquisition, after sensitization, convert data image signal into.Photo-sensitive cell 41 can be general CCD or CMOS etc.
In order to reduce the noise of image; So focusing system have one be connected in photo-sensitive cell 41 gain adjusting unit 42; Can data image signal be reduced noise after the gain adjustment, preferable mode is to reduce the yield value of photo-sensitive cell 41, can reduce picture noise simultaneously.Though but can reduce noise through reducing yield value, can influence image quality, so in the process of normal photographing, can be auxiliary again with the digital gain adjustment, to guarantee to take quality.Like digital gain compensation unit 45 among the figure, this element 45 promptly receives through the adjusted data image signal of gain, again through digital gain compensation, with the image behind compensation adjustment photo-sensitive cell 41 yield values.
Behind gain adjusting unit 42 adjustment yield values; Then the memory position acquisition unit 43 by a connection gain adjusting unit 42 captures the data image signal behind the reduction noise; With the data that capture a plurality of memory positions (as in the precedent by the data that capture 8 in higher 10); Particularly the position is wherein effectively remembered in acquisition, like the memory position of acquisition lower position, to avoid having lost in processing procedure the details of image.Noticeable place is, the image of under the low-light level scene, taking, and the memory position of higher position does not normally have the state of data, so acquisition is than the position on low level rank, avoidable loss details.
Afterwards, introduce one and connect the tone adjustment unit 44 of remembering position acquisition unit 43, in order to data image signal is carried out whole (tone mapping) step of key of the same colour, the contrast that improves data image signal.This tone set-up procedure is that the memory position with above-mentioned acquisition is amplified to a scope through linear scaling, amplifying details wherein, helps accurate focusing through the image of tone adjustment.
In this embodiment, a focusing image generation unit 47 is arranged, be linked to tone adjustment unit 44; In order to receive data image signal through the tone adjustment; And the generation focus image, this focus image is calculated the sharpness of focus image more promptly in order to the image as instant image focusing by the focusing unit that is linked 48; At last according to one can make this focus image clearly focal length adjust this camera lens module 40 automatically, carry out to take.
In the accompanying drawing of this embodiment, show in the camera to have more image display processing unit 46, be received from camera lens module 40 positions that focusing unit 48 is drawn, so as to exporting the CD-ROM drive motor that shows from not, to take the image of accurate focusing.Above-mentioned warp more is applied to show an instant image to the imaging of defocused automatic adjustment camera lens module 40 automatically, and just, image display processing unit 46 provides display unit 49 to show instant image simultaneously in the accompanying drawing, supplies user's preview shooting.
Fig. 5 is and uses the present invention shown in Figure 4 carries out the system of focusing automatically in the low-light level scene integrated circuit calcspar.
By camera lens module 40 photographic images; After photo-sensitive cell 41 acquisitions; Convert data image signal into, produce the instant image that is used to focus, and produce the instant image that user's preview is provided through Fig. 4 images displayed processing module 400; Like the instant image that shows through display unit 49, or producing digital image file is stored in the storage element 57.
Simultaneously, by the focusing result that image processing module 400 produces, its data transfer is in control module 53; Control module 53 receives the instruction of user through key groups 51; Such as the button of partly tripping, promptly automatically perform the focusing program, receive focusing information by control module 53; Control drive unit 55 removes to drive camera lens module 40, and adjustment is to the position of focus lens.
Through focusing program repeatedly, can obtain the focusing result an of the best at last, reach the accurately instant image purpose of focusing automatically.
During above-mentioned focusing, to a plurality of positions, to calculate sharpness, a mode of the calculating of sharpness is to compare according to the picture element of edge of image, and estimates the position that sharpness is maximum, is the result of automatic focusing with moving lens module 40.
The present invention reduces the yield value of photo-sensitive cell earlier, afterwards before focusing automatically; Because hardware or other are considered the relation of (like cost, efficient); Only the position is effectively remembered in acquisition, and under the photographed scene of low-light level, the corresponding curve that the present invention more provides tone as shown in Figure 6 to adjust; Can data image signal be amplified through linear scaling, keep maximum details.
In this example; The transverse axis of the corresponding curve of tone adjustment shows the tone input value; The image of former input can have 0-4095 (12 s') scope, through the above-mentioned back, memory position (loss is details partly) of choosing, in one embodiment; The image value of actual treatment will fall within M among the figure through the mean value and the standard deviation of computed image brightness
LowWith M
HighBetween, to amplify through linear afterwards, tone output valve (longitudinal axis) promptly is amplified between 0 to 255 (8), is amplified to a scope with this linear scaling, to amplify details wherein, helps using instant picture accurate focusing.
Fig. 7 is shown as the method flow diagram that the present invention carries out automatic focusing.
When this embodiment began, like step S701, by camera lens module acquisition image, after automatic exposure (AE), the exposure value that is produced by the automatic exposure program drew lightness (step S703), and judges bright or dark (step S705) through a threshold value.
If be judged as " bright ", promptly belong to a high brightness scene, the image that expression is passed through to be captured can produce precise focusing, so can carry out automatic focusing (step S713), produces instant image, and supplies user's preview (step S715).
But if be judged as " secretly ", if belong to a low-light level scene, expression is arranged in the low-light level scene, earlier like step S707, reduces the photo-sensitive cell yield value, to reduce the noise in the image.The memory of selectivity acquisition afterwards (step S709); Owing to lose more details because capturing in the process of remembering the position easily in the low-light level scene; So the present invention selects to capture effective memory position, such as the memory position of acquisition than the low level rank, to keep wherein details.
Afterwards; Like step S711; Carry out a linear corresponding computing; Be adjusted to a scope through tone, the contrast that improves this data image signal whereby produces the instant image that can accurately focus, then utilizes through abovementioned steps adjustment data image signal later to make camera lens module carry out focusing (step S713) automatically and instant image preview (step S715).
Then see also the present invention shown in Figure 8 and carry out the method flow diagram of focusing automatically in the low-light level scene.This example in the low-light level scene, reduces photo-sensitive cell yield value (step S801) earlier, to reduce noise for to judge the flow process of in the low-light level scene, taking.Then, the image that is captured is used in " focusing is used " and " for shooting " simultaneously.
If be used to the usefulness of focusing, focusing system provided by the present invention will selectively be adjusted acquisition memory position (step S803), be used further to adjust tone (step S805), and the tone adjustment can be with reference to figure 6.Image through the adjustment tone is provided for instant image preview (step S807); Reception is behind the data image signal of tone adjustment; Produce focus image, an instant image just is so as to carrying out automatic focusing; Calculate a plurality of sharpness on a plurality of positions of moving through camera lens module, and estimate that the maximum position of sharpness is the result (step S809) of automatic focusing.
If be used for for shooting; Because prior to reducing the yield value of photo-sensitive cell among the step S801, at this moment, i.e. combine digital gain compensation (step S811) again; Make brightness of image that the user sees in screen identical when not reducing yield value; Through Flame Image Process, receive result (step S813) afterwards, carry out and take (step S815) by above-mentioned focusing program.
In sum; Disclose a kind of System and method for of focusing automatically of carrying out in the low-light level scene according to the present invention; The program of, darkness bright through judging; In the low-light level scene, use the memory position of adjustment acquisition, the adjustment of linear tone, under the situation of using more significance bit, can obtain focusing more accurately.On the other hand, in shooting process, can pass through digital gain compensation, obtain keeping the image of brightness.
But the above is merely preferable possible embodiments of the present invention; Non-so promptly limit to claim protection domain of the present invention; So the equivalent structure that all utilizations instructions of the present invention and accompanying drawing content are done changes, all in like manner be contained in the claim protection domain of the present invention, hereby statement.
Claims (10)
1. a system of focusing automatically in the execution of low-light level scene is applied to the shooting of a low-light level scene, it is characterized in that described system includes:
One camera lens module is in order to take an image;
One photo-sensitive cell links this camera lens module, and with converting data image signal after this image sensitization into;
One gain adjusting unit links this photo-sensitive cell, and will be to reduce noise after this data image signal gain adjustment that this photo-sensitive cell produces;
One memory position acquisition unit links this gain adjusting unit, in order to the data of a plurality of memories position in the data image signal of acquisition after reducing noise;
Key of the same colour is put in order the unit, links to remember the position acquisition unit, and is rapid in order to this data image signal after reducing noise is carried out key synchronizing of the same colour, the contrast that improves this data image signal thus;
One focusing image generation unit is to link this tone adjustment unit receiving this data image signal through the tone adjustment, and is converted into a focusing image; And
One focusing unit links this focus image generation unit and this camera lens module, and this focusing unit calculates the definition of this focus image earlier, again based on one can make this focus image clearly focal length adjust this camera lens module automatically, continue and carry out to take.
2. as claimed in claim 1ly carry out the system of focusing automatically, it is characterized in that described system distinguishes a high brightness scene and this low-light level scene according to the exposure value that an automatic exposure unit produces in the low-light level scene.
3. as claimed in claim 1ly carry out the system of focusing automatically, it is characterized in that described tone set-up procedure carries out a linear corresponding computing by this tone adjustment unit in the low-light level scene.
4. system of focusing automatically in the execution of low-light level scene as claimed in claim 1 is characterized in that, on a plurality of positions that this camera lens module moves, calculates this sharpness, estimates that the maximum position of this sharpness is the result of automatic focusing.
5. as claimed in claim 1ly carry out the system of focusing automatically, it is characterized in that described memory position acquisition unit, optionally capture the data of this a plurality of memories in the low-light level scene.
6. as claimed in claim 5ly carry out the system of focusing automatically, it is characterized in that in the low-light level scene, when this low-light level scene is taken, in this a plurality of memories position of this memory position acquisition unit acquisition than the data on low level rank.
7. carry out the method for focusing automatically in the low-light level scene for one kind, it is characterized in that described method comprises:
Capture an image through a camera lens module, and be data image signal with this image transitions through a photo-sensitive cell;
Exposure value according to an automatic exposure program produces is judged the lightness of this image, if belong to a low-light level scene, promptly carries out:
Adjust the yield value of this photo-sensitive cell, to reduce the noise of this data image signal that produces through this photo-sensitive cell;
A plurality of memories position of this data image signal of selectivity acquisition after reducing noise;
Adjust this tone, the contrast that improves this data image signal thus through the data image signal of selection; And
Utilization makes this camera lens module carry out focusing automatically through adjustment tone data image signal later.
8. method of focusing automatically in the execution of low-light level scene as claimed in claim 7 is characterized in that, comprises in this step of focusing automatically:
Receive this data image signal, produce a focusing image through the tone adjustment; And
Calculate a plurality of sharpness on a plurality of positions of moving through this camera lens module, estimate that the maximum position of this sharpness is the result of automatic focusing.
9. as claimed in claim 7ly carry out the method for focusing automatically, it is characterized in that described tone set-up procedure carries out a linear corresponding computing in the value of selected memory position in the low-light level scene.
10. as claimed in claim 7ly carry out the method for focusing automatically, it is characterized in that, when this low-light level scene is taken, capture in this a plurality of memories position data than the low level rank in the low-light level scene.
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| CN103402057B (en) * | 2013-08-07 | 2016-10-26 | 深圳波粒科技股份有限公司 | Video camera focusing method and video camera |
| CN105141849B (en) * | 2015-09-21 | 2019-03-01 | 济南中维世纪科技有限公司 | A kind of method and system improving night vision focus statistics accuracy of information |
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| CN1452386A (en) * | 2002-04-18 | 2003-10-29 | 奥林巴斯光学工业株式会社 | Camera unit |
| CN101339348A (en) * | 2007-07-05 | 2009-01-07 | 株式会社理光 | Image sensing apparatus and image sensing method |
| CN101383126A (en) * | 2007-09-06 | 2009-03-11 | 奇景光电股份有限公司 | Method and apparatus for processing digital image to be displayed on display device with backlight module |
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| CN1452386A (en) * | 2002-04-18 | 2003-10-29 | 奥林巴斯光学工业株式会社 | Camera unit |
| CN101339348A (en) * | 2007-07-05 | 2009-01-07 | 株式会社理光 | Image sensing apparatus and image sensing method |
| CN101383126A (en) * | 2007-09-06 | 2009-03-11 | 奇景光电股份有限公司 | Method and apparatus for processing digital image to be displayed on display device with backlight module |
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