CN1829288A - Image pick-up device and image pick-up method - Google Patents
Image pick-up device and image pick-up method Download PDFInfo
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- CN1829288A CN1829288A CNA2006100095007A CN200610009500A CN1829288A CN 1829288 A CN1829288 A CN 1829288A CN A2006100095007 A CNA2006100095007 A CN A2006100095007A CN 200610009500 A CN200610009500 A CN 200610009500A CN 1829288 A CN1829288 A CN 1829288A
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Abstract
Provide a kind of Image pick-up device and method, which can focus even if in the condition of decreasing the pink of AF evaluation value or emerging the several peaks because of noise. The device includes: electric filter selection unit that select several electric filters that have different penetration frequency component with each other and the electric filter that make the specific penetration frequency component of the body image shot by image pick-up device penetrated the several electric filters described above; the frequency component detecting unit that detect the frequency signal of electric filter that come from selection by electric filter selection unit, electric filter selection unit change the electric filter according to image pick-up condition. Bearing photometric unit measure the brightness of shot body, electric filter selection unit change the electric filter according to the measure result of photometric unit. The photometric unit is divided several photometric area by the shot body, which proceed photometric according to the evaluation value of the divided respective photometric area, the descriptive electric filter selection unit change the electric filter according to the measure result of photometric unit.
Description
Technical field
The present invention relates to carry out auto-focus and detect, particularly carry out camera head and method thereof that the auto-focus corresponding with the brightness of the body that is taken detects, for example, be suitable for electronic image pickup devices such as digital camera.
Background technology
Electronic image pickup devices such as digital camera generally are mounted with automatic focus (hereinafter referred to as ' the AF ') device of automatically focusing for the body that is taken.As the AF control method in the AF device, be extensive use of gradient (り is stepped on the mountain) (maximal point detection) AF control (contrast AF control) (for example, with reference to patent documentation 1).This gradient AF control is asked the integrated value of the luminance difference of adjacent pixels according to the picture signal of imaging apparatus output, and with the integrated value of this luminance difference AF evaluation of estimate as the expression focus level.When being in focus state, the outline portion of the body that is taken is obvious, and the luminance difference between neighborhood pixels increases, so the AF evaluation of estimate increases.When the non-focusing state, the outline portion of the body that is taken is fuzzy, and the luminance difference between pixel reduces, so the AF evaluation of estimate reduces.When carrying out the AF action, on one side mobile lens, obtain this AF evaluation of estimate on one side successively, with AF evaluation of estimate maximum, be crest location as focus point, thereby lens are stopped.
In addition, under the situation of in dark environment, photographing (below, be ' during low-light level '), or to the body that is taken that do not have contrast (light and shade is poor) (below, be ' low contrast be taken body ') under the situation of photographing, as previously mentioned, because the AF evaluation of estimate is that the luminance difference between neighborhood pixels has been carried out principal value of integral, so when low-light level or low contrast be taken in the body, become very little value.And, be subjected to the influence of the random noise that produces when imaging apparatus carries out light-to-current inversion easily.Specifically, because the value of AF evaluation of estimate reduces, therefore buried in noise easily, the crest that can not judge the evaluation of estimate of AF still is the crest that noise causes, the problem that existence can't focus on.In addition, during about the close-shot shadow as macro mode, because camera and the distance of body of being taken are near, so camera becomes shade, and the contrast of the body that is taken descends, and also has the problem that can't focus on.
Therefore, having proposed a kind of is under the situation of low-light level at the body that is taken, the method (for example, with reference to patent documentation 2) that the zone of obtaining the AF evaluation of estimate is enlarged.
In addition, propose to improve light exposure control under the dark situation of a kind of body brightness ratio brightness on every side that is taken in the AF zone temporarily, emphasize crest by increasing the AF evaluation of estimate, for example, even backlight, also can carry out the method (for example, with reference to patent documentation 3) of AF control.But, when the body that is taken is low-light level, if shutter speed or aperture is open and improve exposure temporarily, its result then, the noise when exposure beyond the view data enters, and this noise produces spurious peaks, the possibility that exists focusing accuracy to descend.
Above-mentioned AF zone is meant the zone of setting in order to carry out AF control in the photography zone of camera, for example, is set to the center in photography zone as the AF zone with horizontal 40%, vertical about 30% zones of cutting apart of photography visual field.
When the body that is taken was low-light level, such just like the invention of patent documentation 2 records in order to improve the AF precision, change (increases) obtained the method in zone of AF evaluation of estimate and such just like the invention of patent documentation 3 records, the method for raising exposure.
[patent documentation 1] special public clear 39-5265 communique
[patent documentation 2] spy opens flat 11-215426 communique
[patent documentation 3] spy opens the 2004-138970 communique
Summary of the invention
The method that the filter of the present invention research frequency component when obtaining obtaining the AF evaluation of estimate changes, be based on and separately use the design of the filter of the frequency component when obtaining obtaining the AF evaluation of estimate to create, its purpose is to provide a kind of camera head and image capture method, even its peak dot in the AF evaluation of estimate reduces under such environment, perhaps crest is owing to also can focus under a plurality of such environment appears in noise.
The present invention also aims to provide a kind of camera head and image capture method, it is based on body and the photometry result on every side of being taken, the filter that the frequency component of change when obtaining the AF evaluation of estimate extracted, even thereby the body that is taken be the situation of low contrast or the body that is taken is dark and situation that brightness is low like this, under the environment that reduces of the peak dot of AF evaluation of estimate, perhaps crest is owing to also can focus under a plurality of such environment appears in noise.
The present invention also aims to provide a kind of camera head and image capture method, the AF precision when it can further improve low-light level by selective filter.
To achieve these goals, camera head of the present invention receives the light of the body that is taken by photographic lens, thereby obtain view data, its topmost being characterised in that, comprise: filter selected cell, the filter that select to see through the different mutually a plurality of filters of frequency component and the specific frequency components of the body image that is taken is seen through from these a plurality of filters; And the frequency component detecting unit, detection comes the frequency signal of the filter of free this filter selected cell selection, and above-mentioned filter selected cell changes filter according to photography conditions.
This each filter can be by the combination of only high pass filter, high pass filter and low pass filter, only low pass filter constitutes, and these filters can adopt the filter on the image processing.
And then, comprising the photometry unit of measuring the body brightness that is taken, it is then better that above-mentioned filter selected cell changes filter according to the photometry result who is obtained by this photometry unit.
In addition, can also can change above-mentioned filter according to photograph mode (for example, macro mode, character pattern or night scene mode etc. are to the pattern of the body particularization that is taken).Perhaps, if comprise the device of the element of finding range, then also can change above-mentioned filter according to distance from the output of range finding element.
Above-mentioned photometry unit constitutes the body that is taken is divided into a plurality of photometry regions, by obtaining each regional evaluation of estimate that this is cut apart, thereby carries out photometry, and it is then better that above-mentioned filter selected cell changes filter according to the photometry result who is obtained by this photometry unit.
Filter selector changes filter according to photography conditions, thereby even reduce under such environment at the peak dot of AF evaluation of estimate, perhaps crest is owing to also can focus under a plurality of such environment appears in noise.
Change filter by constituting the filter selected cell according to the photometry result that obtains by this photometry unit,, also can focus on even under for the AF exacting terms.
Constitute by above-mentioned photometry unit the body that is taken is divided into a plurality of photometry regions, by obtaining each regional evaluation of estimate that this is cut apart, thereby carry out photometry, above-mentioned filter selected cell changes filter according to this photometry result, even under, also can focus on for the AF exacting terms.
Description of drawings
Fig. 1 represents to use the example of the digital camera of camera head of the present invention and image capture method, and Fig. 1 (a) is a plane graph, and Fig. 1 (b) is a front view, and Fig. 1 (c) is a rearview.
Fig. 2 is the block diagram of example of electric treatment system of the inside of the expression digital camera that can use camera head of the present invention and image capture method.
Fig. 3 (a)～Fig. 3 (c) is that expression can be applicable to the various examples of filter of the present invention and uses the curve chart of example of the appearance method of the crest location under the situation of these filters.
Fig. 4 is the flow chart of the embodiment 1 of expression camera head of the present invention and image capture method.
Fig. 5 is the flow chart of the embodiment 2 of expression camera head of the present invention and image capture method.
Fig. 6 is that expression can be applicable to the flow chart that filter of the present invention is selected the example of processing.
Fig. 7 is the illustraton of model that expression can be applicable to the various examples of frequency extraction filter of the present invention.
Fig. 8 is that expression can be applicable to the flow chart that filter of the present invention is selected the example of processing.
Fig. 9 is the flow chart of the embodiment 3 of expression camera head of the present invention and image capture method.
Embodiment
Below, with reference to the embodiment of description of drawings camera head of the present invention and image capture method.
Fig. 1 is front view, rearview and the plane graph of expression as the example of the digital camera of the example of camera head of the present invention.Fig. 2 is the block diagram of summary of the system configuration example of this digital camera inside of expression.In Fig. 1, on camera, dispose release (release) switch SW 1, pattern rotating disk SW2, secondary LCD (below, LCD is called ' LCD ') 1.Dispose the lid 2 in the lens barrel unit 7, optical finder 4, photoflash lamp illuminating part 3, range cells 5, remote control light accepting part 6, storage card filling storehouse and the battery filling storehouse that comprise photographic lens in the front of camera.The back side of camera dispose mains switch 13, LCD monitor 10, AF with LED8, photoflash lamp LED9, optical finder 4, wide-angle direction scaling switch SW3, long burnt direction scaling switch SW4, autodyne setting regularly and cancel switch SW5, menu switch SW6, on move and photoflash lamp is provided with switch SW 7, the switch SW that moves to right 8, display switch SW9, move down and macro switch SW10, move to left and image confirm switch SW 11, OK switch SW 12, fast access switch SW 13,
The system configuration of digital camera inside is as follows.In Fig. 2, the each several part that constitutes digital camera is by digital camera processor 104 (be designated hereinafter simply as ' processor 104 ') control.Processor 104 has CCD1 signal processing piece 104-1, CCD2 signal processing piece 104-2, CPU piece 104-3, local SRAM104-4, USB piece 104-5, serial block 104-6, JPEG CODEC (coding decoder) piece 104-7, RESIZE (adjusting size) piece 104-8, TV signal displaying block 104-9, memory card controller piece 104-10, and they connect by bus mutually.Exterior arrangement at processor 104 has the SDRAM103 that preserves RAW-RGB view data, YUV view data, jpeg image data, is connected with processor 104 by bus.Exterior arrangement at processor 104 has RAM107, internal memory 120, has stored the ROM108 of control program, is connected with processor 104 by bus.
Described lens barrel unit 7 has: convergent-divergent optical system 7-1 has zoom lens 7-1a; Focused Optical system 7-2 has condenser lens 7-2a; Aperture unit 7-3 has aperture 7-3a; And mechanical shutter unit 7-4, have mechanical shutter 7-4a.Convergent-divergent optical system 7-1, Focused Optical system 7-2, aperture unit 7-3, mechanical shutter unit 7-4 are driven by convergent-divergent motor 7-1b, focusing motor 7-2b, aperture motor 7-3b, mechanical shutter motor 7-4b respectively, the motor driver 7-5 Be Controlled action that these each motors are controlled by the CPU piece 104-3 by processor 104.
The SoundRec action of the described CPU piece 104-3 control voice recording circuit 115-1 of processor 104.Voice recording circuit 115-1 is passed through the amplifying signal of loudspeaker amplifier 115-2 by the voice signal of loudspeaker 115-3 conversion according to the instruction record.Above-mentioned CPU piece 104-3 also controls the action of sound reproducing circuit 116-1.Audio reproduction circuit 116-1 is reproduced in the voice signal that writes down in the suitable memory and imports audio frequency amplifier 116-2 by instruction, and from loud speaker 116-3 output sound.By controlling the action of above-mentioned CPU piece 104-3 or flash lamp circuit 114, send illumination light from photoflash lamp illuminating part 3.In addition, CPU piece 104-3 also controls the action of range cells 5.
CPU piece 104-3 is connected with the secondary CPU109 of the outside that is configured in processor 104, and secondary CPU109 is via the demonstration of lcd driver 111 secondary LCD1 of control.Secondary CPU109 also is connected with AFLED8, photoflash lamp LED9, remote control light accepting part 6, the operation keys unit, the buzzer 113 that are made of described switch SW 1～SW13.
Described USB piece 104-5 is connected with USB connector 122, and described serial block 104-6 is connected with RS-232C connector 123-2 via serial driver circuit 123-1.Described TV displaying block 104-9 is connected with LCD monitor 10 by lcd driver 117, in addition, is connected with video socket 119 via the video amplifier 118.Described memory card controller piece 104-10 is connected to the contact that storage card slot 121 is connected with the storage card contact.
Then, the action of digital camera as constituted above is described, the action summary of existing digital camera is described earlier before.By pattern rotating disk SW2 shown in Figure 1 is set at logging mode, by logging mode starting camera (logging mode ON).By the setting of pattern rotating disk SW2, the state of the mode switch that comprises in the operating portion among CPU detection Fig. 2 becomes the situation of logging mode ON, control motor driver 7-5, thus make lens barrel unit 7 move to photographic position.And then, each several part energized such as CCD101, F/E-IC102, LCD display 10 is begun action.During the power connection of each several part, the action of beginning viewfmder mode.
Under viewfmder mode, after the light that scioptics are injected imaging apparatus (CCD101) is transformed to the signal of telecommunication, be sent to CDS circuit 102-1, A/D converter 102-3 as R, G, the B of analog signal.Each signal that is converted to digital signal by A/D converter 102-3 is subjected to signal processing by CCD1 signal processing piece 104-2, become the RAW-RGB view data in the Digital Signal Processing IC (SDRAM103), be converted to YUV signal by the YUV converter section, become the jpeg image data, write frame memory by Memory Controller.This YUV signal is read out Memory Controller, is sent to TV or LCD monitor 10 via TV signal displaying block 104-9 and shows.This processing was carried out at interval with 1/30 second, became the demonstration of per viewfmder mode that was updated in 1/30 second.
In addition, by the digital rgb signal in the CCDI/F piece (not shown) that is taken into Digital Signal Processing IC (SDRAM103), calculate the AF evaluation of estimate of the focus level of expression picture, the AE evaluation of estimate of expression exposure status.AF evaluation of estimate data are read by CPU as characteristic, are used for the processing of AF.The AF evaluation of estimate is generated by the integrated value of the luminance difference of the output integrated value of frequency component extraction filter (with reference to Fig. 7 etc.), neighborhood pixels.The generation of above-mentioned AF evaluation of estimate and be that the present application is peculiar based on the selection of the frequency component extraction filter of this AF evaluation of estimate.
The function of frequency component extraction filter is described here.The example of the AF evaluation of estimate waveform when Fig. 3 represents actual low-light level.In each figure of Fig. 3 (a), Fig. 3 (b), Fig. 3 (c), transverse axis is the position of condenser lens, and the longitudinal axis is the AF evaluation of estimate.The brightness data that becomes each basic pixel among Fig. 3 (a), Fig. 3 (b), Fig. 3 (c) is all identical.
Fig. 3 (a) is a situation about only having used as (1,2 ,-1) filter of high pass filter, Fig. 3 (b) has been to use as (1,2 ,-1) filter of high pass filter with as the situation of (1,2,4,2,1) filter of low pass filter, and Fig. 3 (c) has been to use as (1,2 ,-1) filter of high pass filter with as the situation of (1,2,4,8,4,2,1) filter of low pass filter.
For the low pass filter of Fig. 3 (b), the low pass filter of Fig. 3 (c) increases coefficient and has emphasized relevant with on every side pixel.
Here, high pass filter and low pass filter are the filters on the image processing.
High pass filter shown in Fig. 3 (a) is the filter of the luminance difference between the pixel of emphasizing the filter of high band component, promptly emphasizing to be close to.High pass filter shown in Fig. 3 (a) multiply by ' 1 ' ' 2 ' ' 1 ' coefficient respectively to the brightness data of object pixel and its contiguous pixel.
The low pass filter that uses in the example shown in Fig. 3 (b), Fig. 3 (c) is to make the filter of removing noise component(s) with on every side relevant mild.It is that brightness data to object pixel and its contiguous pixel multiply by ' 1 ' ' 2 ' ' 4 ' ' 8 ' ' 4 ' ' 2 ' ' 1 ' coefficient respectively that low pass filter shown in Fig. 3 (b) multiply by ' 1 ' ' 2 ' ' 4 ' ' coefficient of 2 ' ' 1 ', the low pass filter shown in Fig. 3 (c) respectively to the brightness data of the contiguous pixel of object pixel and its.
Fig. 3 (b), Fig. 3 (c) have added above-mentioned low pass filter to the high pass filter shown in Fig. 3 (a).
Shown in Fig. 3 (a), under the situation of only having used high pass filter, highband part is emphasized that crest location is emphasized a little.But, also remaining noise component(s) under this photography conditions, and crest location is so not clear and definite yet, has the possibility that makes AF location recognition mistake like this.Above-mentioned ' noise ' is meant the noise of exporting when imaging apparatus carries out light-to-current inversion (random noise), and the size of the noise of generation does not change for the size of the light of input.During the light deepening of input, the size of the signal of telecommunication of output also diminishes, but because the noise that takes place big or small identical, so The noise relatively increases.Fig. 3 (a) represents this state, and the peak value of focal position is little, buries AF evaluation of estimate in other condenser lens position, is in the noise.On the contrary, the example shown in Fig. 3 (b) like this, the structure that high pass filter has been added low pass filter is compared with the situation of the example shown in Fig. 3 (a) as can be known, crest location is emphasized, the noise component(s) that thin peak dot or valley point constitute is removed, and becomes mild, detects the peak dot of crest easily.In addition, the example shown in Fig. 3 (c) like this, by low pass filter being changed to the further relevant filter of having strengthened with surrounding pixel, then the peak dot of crest is further emphasized, can detect the AF position more accurately.
As shown in Figure 3, the frequency component extraction filter is useful on high frequency band, is used for two kinds of low-frequency band, and can generate the output integrated value of the filter that these filters are compound.When this integrated value was in focus state, because the marginal portion of the body that is taken is obvious, so high fdrequency component was the highest.Utilize it, when the focus detection action of carrying out AF, obtain the AF evaluation of estimate of each condenser lens position, and detection becomes its great point (crest location).In addition, to become great point exists a plurality of situations also to include consideration in, exist under a plurality of situations, judge crest location evaluation of estimate size or with decline, the rising degree of evaluation of estimate around it, the point that reliability is the highest is carried out AF as focal position.
In addition, comprise the body that is taken is divided into a plurality of photometry regions, by obtaining the photometry unit that this each regional evaluation of estimate of cutting apart is carried out photometry.Specifically, be several zones with the digital rgb signal segmentation, with this each zone of cutting apart as photometry region.Use the brightness data in the photometry region to ask described AE evaluation of estimate.That is, for the pixel in each zone, the pixel of the threshold value that will surpass stipulate with its added luminance, and multiply by the object pixel number, thereby finds the solution as object pixel.By each regional Luminance Distribution, calculate the correct exposure amount, being taken into of next frame proofreaied and correct.
When the release shutter release button was pressed, the still image photographing commencing signal was taken into processor 104 from CCD101 shown in Figure 2 via F/E-IC102.Then, microcomputer (CPU piece 104-3) is synchronous with frame frequency, drives the drive motors 7-2b of condenser lens 7-2a via motor driver 7-5, thereby carries out gradient AF.Focusing range from unlimited under nearest region-wide situation, condenser lens is from recently to unlimited or from infinitely moving to recently, microcomputer is read the AF evaluation of estimate of each frame (=each focal position) that is generated by Digital Signal Processing IC.The AF evaluation of estimate of each focal position is become great, make condenser lens 7-2a move to focal position as focal position.
After AF finished, the analog rgb signal that takes out from CCD101 was transformed to the digital rgb signal, via Digital Signal Processing IC as among the SDRAM103 that is stored in as frame memory.The digital rgb signal is read in digital signal processing circuit once more and is converted into yuv data, and is written back to above-mentioned frame memory.When rest image was made a video recording, the view data that has been carried out the YUV conversion was sent to the interior JPEG CODEC piece 104-7 as the image compression expanded circuit of Digital Signal Processing IC.The yuv data that is sent to the image compression expanded circuit is compressed, and is written back to frame memory.The packed data of frame memory is read out via digital signal processing circuit, and is stored in data storage, for example storage card.
Then, be the center with the flow chart, on one side with reference to the action that becomes their feature for various embodiments of the present invention is described on one side.In addition, the action step in each flow chart is shown as (4-1) (4-2) ...
[embodiment 1]
Fig. 4 represents the action to the camera head of embodiment 1.At first, begin action by operating release shutter release button SW1 shown in Figure 1, the previous photometry result who is pressed according to the release shutter release button judges the brightness (4-2) of the body that is taken.The body brightness that is taken can be measured according to the output of CCD101.Carry out selecting the processing (4-3) of frequency component extraction filter according to the brightness (LV value) that obtains from the photometry result.In this embodiment, prepare three filters as shown in Figure 7, for example, by selecting the frequency extraction filter according to the processing of flow chart shown in Figure 6.Represent that specifically three Filter Structures shown in Figure 7 are as follows.First filter is high pass filter that will be made of coefficient ' 1 ' ' 2 ' ' 1 ' and the compound filter of low pass filter that is made of coefficient ' 1 ' ' 2 ' ' 1 '.Second filter is high pass filter that will be made of coefficient ' 1 ' ' 2 ' ' 1 ' and the compound filter of low pass filter that is made of coefficient ' 1 ' ' 2 ' ' 4 ' ' 2 ' ' 1 '.The 3rd filter is high pass filter that will be made of coefficient ' 1 ' ' 2 ' ' 1 ' and the compound filter of low pass filter that is made of coefficient ' 1 ' ' 2 ' ' 4 ' ' 8 ' ' 4 ' ' 2 ' ' 1 '.Above-mentioned first filter also can only be made of high pass filter.
The function of such filter is described based on Fig. 3.
The selection action of said frequencies extraction filter is as follows.Under the situation of body brightness that be taken (6-1) more than or equal to LV6, select first filter (6-2), if less than LV6, then proceed to the body that is taken whether more than or equal to the determining step (6-3) of LV5.In step 6-3, if more than or equal to LV5, then select second filter (6-4), under less than the situation of LV5, select the 3rd filter (6-5).The threshold value of the above-mentioned brightness of setting in each determining step (LV value) only limits to the situation of present embodiment, can wait according to the performance of the f-number (F value) of lens, CCD101 and change.
In the above-described embodiments, prepared three filters, but also can use filter more than or equal to three.In addition, even Zu He each filter is replaced also having no relations by the filter of the coefficient that has been set other in the above-described embodiments.These filters use high fdrequency component extraction filters and to the high fdrequency component extraction filter compound the filter of low frequency component extraction filter, along with brightness descends, increase low frequency component extraction filter (strengthen between surrounding pixel relevant).
Turn back to Fig. 4, condenser lens 7-2a is moved to focus on starting position (4-4), and obtain AF evaluation of estimate (4-5).Do you after the obtaining of AF evaluation of estimate, judge that by crest judgment processing (4-6) this evaluation of estimate is the detection of crest, promptly ' is not that crest detects? ' (4-7).If detecting under the situation of crest, transfer to crest localization process (4-10).Under the situation that does not detect crest, proceed to the determining step (4-8) whether scanning be through with till the terminal of focal position, not have in scanning under the situation of end, mobile successively focal position (4-9), and turn back to evaluation of estimate and obtain treatment step (4-5) and repeat same processing.In addition, at the end of scan situation under, transfer to crest localization process (4-10).
Then, the AF evaluation of estimate by this scanning decides the crest location that reliability is more arranged, and makes condenser lens move to the crest location of decision and tenth skill.Under the situation of crest location that also not find to have reliability,, make condenser lens move to the focal position of regulation, for example be equivalent to the focal position of about 2.5m and tenth skill (4-10) as not being AF scanning.
If Digital Signal Processing IC can obtain the AF evaluation of estimate from a plurality of frequency component extraction filters, then also can obtain output simultaneously, and separate use according to brightness from described three filters.
In addition, if Digital Signal Processing IC can obtain the AF evaluation of estimate in a plurality of AF zone simultaneously, then also can obtain the AF evaluation of estimate in above-mentioned a plurality of AF zone, and separate use according to brightness.
[embodiment 2]
Then, be the center with flow chart shown in Figure 5, on one side with reference to embodiment 2 is described on one side.
When release shutter release button SW1 shown in Figure 1 was operated, the previous photometry result who is pressed according to the release shutter release button judged the brightness (5-2) of the body that is taken.Carry out selecting the processing (5-3) of frequency component extraction filter according to the brightness (LV value) that obtains from the photometry result.In the present embodiment, prepare three filters as shown in Figure 7, select the frequency extraction filter by the such processing of flow chart for example shown in Figure 8.This filter is selected to handle at first judgement and whether is taken body brightness less than LV6 (10-1), be not less than LV6, promptly under the situation more than or equal to LV6, whether the judgement of not selecting (10-2) when carrying out last scan, if do not select, then select first filter (10-3), if when last scan, select, whether then proceed to determining step (10-4) more than or equal to LV5.The body brightness that is taken in step 10-1 also proceeds to determining step (10-4) less than the situation of LV6.In determining step (10-4), be judged as under the situation more than or equal to LV5, the judgement of not selecting (10-5) when whether carrying out last scan,, then select second filter (10-6) if do not select.In addition, in determining step (10-4), be judged as under the situation less than LV5, select the 3rd filter (10-7).Do not select if in step 10-5, when last scan,, then proceed to step 10-4.More than the threshold value of Shuo Ming brightness (LV value) only limits to the situation of present embodiment, can wait according to the performance of the F value of lens, CCD101 and change.
Prepared three filters in the present embodiment, also can but use separately to use more than or equal to three filter.In addition, also can replace with other filter.These filters use high fdrequency component extraction filters and to the high fdrequency component extraction filter compound the filter of low frequency component extraction filter, along with brightness descends, increase low frequency component extraction filter (strengthen between surrounding pixel relevant).
Turn back to Fig. 5, then, condenser lens is moved to focus on starting position (5-4), obtain AF evaluation of estimate (5-5).Whether after the AF evaluation of estimate obtains, detecting this evaluation of estimate by crest determination processing (5-6) is crest.If detect under the situation of crest, transfer to crest localization process (5-11).Under the situation that does not detect crest, in end of scan determining step (5-9), be judged as under the situation that does not have to finish till the terminal that scans focal position, mobile successively focal position (5-7), and turn back to evaluation of estimate and obtain treatment step (5-5), proceed crest location and detect.
In above-mentioned steps 5-9, failing to detect crest the end of scan situation under, proceed to whether the filter of selecting is the determining step (5-10) of the 3rd filter in filter select to be handled.Being judged as in this step (5-10) is under the situation of the 3rd filter, is judged to be not to be AF scanning, and transfers to crest localization process (5-11), moves to the focal position (being about as much as the focal position of 2.5m) of regulation, and finishes.The filter that is judged as selection in step (5-10) is not under the situation of the 3rd filter, traces back to filter once more and selects to handle (5-2), begins from selective filter.Filter when scanning is again selected in selecting to handle, and strengthens than the frequency component extraction filter that uses in the last scan intensity of low frequency component extraction filter (strengthen between surrounding pixel relevant) more.For example for Fig. 8 illustrated like that, if in the AF of last time scanning, selected first filter (10-2), then select second filter (10-6).Equally, if in the AF of last time scanning, selected second filter (10-5), then select the 3rd filter (10-7).
If Digital Signal Processing IC can obtain the AF evaluation of estimate from a plurality of frequency component extraction filters, then also can obtain output simultaneously, and separate use according to brightness from three filters.In addition, if Digital Signal Processing IC can obtain the AF evaluation of estimate in a plurality of AF zone simultaneously, then also can obtain the AF evaluation of estimate in these three AF zones, and separately use according to brightness.
[embodiment 3]
Then, be center explanation embodiment 3 with flow chart shown in Figure 9.When operating release shutter release button SW1 shown in Figure 1, the previous photometry result who is pressed according to the release button judges the brightness (11-2) of the body that is taken.Then, condenser lens is moved to focus on starting position (11-3), obtain pixel data (11-4).This pixel data is the digital rgb signal that is taken in the CCD I/F piece of Digital Signal Processing IC.After the obtaining of pixel data, judge scanning whether be through with till the terminal of focal position (11-5).Under the situation that not have to finish till the terminal of focal position, mobile successively focal position (11-6) scans terminal, and carries out same processing up to end (11-5).
Then, select frequency component extraction filter (11-7) according to the brightness that obtains from the photometry result (LV value).In the present embodiment, prepare three filters as shown in Figure 7, and select the frequency extraction filter by the such processing of flow chart for example shown in Figure 8.Owing to be illustrated, omit explanation here for Fig. 7, Fig. 8.
Follow above-mentioned filter decision processing (11-7) and carry out crest determination processing (11-8).In the crest determination processing, the filter of (11-7) decision is handled in use by the filter decision, the rgb signal of obtaining each focal position that processing (11-4) obtains by pixel data is got weighted average, by with it with carry out crest as evaluation of estimate and judge.Then, use this evaluation of estimate to detect and whether have crest (11-9) in this evaluation of estimate.If detect under the situation of crest, transfer to crest localization process (11-11).Under the situation that does not detect crest, proceed to the 3rd filter whether selected determination step (11-10), the filter of handling decision in (11-7) in the filter decision is not under the situation of the 3rd filter, returns the filter decision once more and handles (11-7) and set filter again.Filter configuration is handled as shown in Figure 8, if selected first filter when last scan, promptly is judged as in step 10-2 under the situation of ' denying ', selects second filter (10-6).Equally, if selected second filter (10-5) in the AF scanning, then select the 3rd filter (10-7) in last time.In addition, the filter of selecting in the AF of last time scanning is under the situation of the 3rd filter, finishes the crest judgement, and transfers to the crest localization process (11-12) among Fig. 9.
In crest localization process (11-12), under crest detects to the situation of OK, make condenser lens move to the focal position suitable with this crest location, and under crest detects to the situation of " not being (NG) ", make focal position that condenser lens moves to regulation (for example, be about as much as the focal position of 2.5m), and finish a series of action.
In the present embodiment, setting, the evaluation of estimate of carrying out filter in single task generates, crest detects, if but Digital Signal Processing IC can carry out multitasking, and also can constitute to carry out this a series of processing simultaneously, and realize the high speed of AF.In addition, if Digital Signal Processing IC can obtain the AF evaluation of estimate in a plurality of AF zone simultaneously, then also can constitute the AF evaluation of estimate that obtains a plurality of AF zone, and separately use according to brightness.
More than among Shuo Ming the embodiment 1,2,3, embodiment 1 shown in Figure 4 according to light value, i.e. the body brightness that is taken comes selective filter, and scanning focused position.Embodiment 2 shown in Figure 5 under the situation of not finding filter, also changes the filter of selecting except embodiment 1.Embodiment shown in Figure 93 has obtained after the monochrome information of each pixel in the AF zone scanning, by the brightness data of obtaining be multiply by filter and integration, thus the decision focal position.
As embodiment 1,2,3, under the low situation of the brightness of the body that is taken, even under the such inapplicable environment of gradient AF of the low situation of contrast, also can change the frequency component extraction filter according to the body brightness that is taken, or the size in change AF zone, thereby can easily calculate crest location.
In addition, ' the filter selected cell ' put down in writing in the technical scheme and ' frequency component detecting unit ' are included in the CCD1 signal processing piece 104-1 shown in Figure 2.
Utilizability on the industry is that camera head of the present invention and image capture method are applicable to and carry out the electronic image pickup devices such as digital camera that auto-focus detects.
Claims (14)
1. camera head, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter selected cell, the filter that select to see through the different mutually a plurality of filters of frequency component and the specific frequency components of the body image that is taken is seen through from these a plurality of filters; And the frequency component detecting unit, detection comes the frequency signal of the filter of free this filter selected cell selection, and above-mentioned filter selected cell changes filter according to photography conditions.
2. camera head, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter selected cell, the filter that select to see through the different mutually a plurality of filters of frequency component and the specific frequency components of the body image that is taken is seen through from these a plurality of filters; Frequency component detecting unit, detection come the frequency signal of the filter of free this filter selected cell selection; And the photometry unit, measure the body brightness that is taken, above-mentioned filter selected cell changes filter according to the photometry result who is obtained by this photometry unit.
3. camera head, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter selected cell, the filter that select to see through the different mutually a plurality of filters of frequency component and the specific frequency components of the body image that is taken is seen through from these a plurality of filters; Frequency component detecting unit, detection come the frequency signal of the filter of free this filter selected cell selection; And the photometry unit, the body that will be taken is divided into a plurality of photometry regions, carries out photometry by obtaining this each regional evaluation of estimate of cutting apart, and above-mentioned filter selected cell changes filter according to the photometry result who is obtained by this photometry unit.
4. as claim 2 or the described camera head of claim 3, it is characterized in that under the low situation of the body brightness that is taken, the filter selected cell changes to filter up to the also permeable filter of low-frequency band side more.
5. as claim 2 or the described camera head of claim 3, it is characterized in that under the high situation of the body brightness that is taken, the filter selected cell changes to filter in the filter that high frequency band is more seen through.
6. camera head, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter selected cell, the filter that select to see through the different mutually a plurality of filters of frequency component and the specific frequency components of the body image that is taken is seen through from these a plurality of filters; Frequency component detecting unit, detection come the frequency signal of the filter of free this filter selected cell selection; And photometry unit, the body that will be taken is divided into a plurality of photometry regions, carry out photometry by obtaining this each regional evaluation of estimate of cutting apart, above-mentioned filter selected cell is according to the photometry result who is obtained by this photometry unit, the filter of having selected is selected other filter and appended, and perhaps the filter that will select changes to other filter.
7. as any one described camera head of claim 1～3, it is characterized in that, has the body region of being taken selected cell, can be from the zone that the selection of the arbitrary region in the body image that is taken is extracted the frequency signal that is seen through by the frequency component detecting unit, this body region selected cell that is taken changes the body region that is taken according to the body brightness that is taken that is obtained by the photometry unit.
8. image capture method, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter is selected step, the filter that the specific frequency components of selecting to see through the different mutually a plurality of filters of frequency component and make the body image that is taken sees through from these a plurality of filters; And frequency component detection step, detect free this filter to select the frequency signal of the filter of step selection, select to change filter according to photography conditions in the step at above-mentioned filter.
9. image capture method, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter is selected step, the filter that the specific frequency components of selecting to see through the different mutually a plurality of filters of frequency component and make the body image that is taken sees through from these a plurality of filters; Frequency component detects step, the frequency signal of the filter that next free this filter selection step of detection is selected; And the photometry step, measure the body brightness that is taken, select to change filter according to the photometry result who in above-mentioned photometry step, obtains in the step at above-mentioned filter.
10. image capture method, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter is selected step, the filter that the specific frequency components of selecting to see through the different mutually a plurality of filters of frequency component and make the body image that is taken sees through from these a plurality of filters; Frequency component detects step, the frequency signal of the filter that next free this filter selection step of detection is selected; And the photometry step, the body that will be taken is divided into a plurality of photometry regions, carries out photometry by obtaining this each regional evaluation of estimate of cutting apart, selects to change filter according to the body brightness that is taken that obtains in the step in above-mentioned photometry step at above-mentioned filter.
11. as claim 9 or the described image capture method of claim 10, it is characterized in that, under the low situation of the body brightness that is taken, in filter is selected step, filter changed to up to the also permeable filter of low-frequency band side more.
12. as claim 9 or the described camera head of claim 10, it is characterized in that, under the high situation of the body brightness that is taken, in filter is selected step, filter changed to the filter that high frequency band is more seen through.
13. image capture method, light to the body that is taken by photographic lens receives, thereby obtain view data, it is characterized in that, comprise: filter is selected step, the filter that the specific frequency components of selecting to see through the different mutually a plurality of filters of frequency component and make the body image that is taken sees through from these a plurality of filters; Frequency component detects step, the frequency signal of the filter that next free this filter selection step of detection is selected; And photometry step, the body that will be taken is divided into a plurality of photometry regions, carry out photometry by obtaining this each regional evaluation of estimate of cutting apart, select in the step at above-mentioned filter, according to the body brightness that is taken that in above-mentioned photometry step, obtains, the filter of having selected is selected other filter and appended, and perhaps the filter that will select changes to other filter.
14. any one described image capture method as claim 8～10, it is characterized in that, comprise: the body region that is taken is selected step, can be from the zone that the selection of the arbitrary region in the body image that is taken is extracted the frequency signal that sees through frequency component detection step, this body region that is taken selects step to change the body region that is taken according to the body brightness that is taken that obtains in the photometry step.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101738826B (en) * | 2008-11-17 | 2012-10-24 | 株式会社日立制作所 | Focus control device and focus control method |
| CN112689853A (en) * | 2020-04-28 | 2021-04-20 | 深圳市大疆创新科技有限公司 | Image processing method, image processing apparatus, photographing device, movable platform and storage medium |
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| JP4802113B2 (en) * | 2006-03-13 | 2011-10-26 | 富士フイルム株式会社 | Automatic focusing device and photographing device |
| JP4855155B2 (en) | 2006-06-27 | 2012-01-18 | 株式会社リコー | Imaging apparatus and imaging method using the same |
| CN100458544C (en) * | 2006-10-10 | 2009-02-04 | 北京中星微电子有限公司 | Automatic focusing method for digital image pickup device |
| JP5106143B2 (en) * | 2008-01-21 | 2012-12-26 | キヤノン株式会社 | Automatic focus adjustment device and automatic focus adjustment method thereof |
| JP5106146B2 (en) * | 2008-01-22 | 2012-12-26 | キヤノン株式会社 | Automatic focus adjustment device |
| JP5219905B2 (en) | 2009-04-07 | 2013-06-26 | 三洋電機株式会社 | Electronic camera |
| JP5857610B2 (en) | 2011-10-13 | 2016-02-10 | 株式会社リコー | Imaging apparatus and imaging method |
| JP6172428B2 (en) * | 2012-06-15 | 2017-08-02 | 株式会社リコー | Imaging apparatus and imaging method |
| KR102405635B1 (en) | 2015-03-18 | 2022-06-03 | 한화테크윈 주식회사 | focus control apparatus and focus measure method |
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| JP2748425B2 (en) * | 1988-08-30 | 1998-05-06 | ソニー株式会社 | Video camera |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738826B (en) * | 2008-11-17 | 2012-10-24 | 株式会社日立制作所 | Focus control device and focus control method |
| CN112689853A (en) * | 2020-04-28 | 2021-04-20 | 深圳市大疆创新科技有限公司 | Image processing method, image processing apparatus, photographing device, movable platform and storage medium |
| WO2021217427A1 (en) * | 2020-04-28 | 2021-11-04 | 深圳市大疆创新科技有限公司 | Image processing method and apparatus, photographing device, movable platform, and storage medium |
Also Published As
| Publication number | Publication date |
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| JP2006243101A (en) | 2006-09-14 |
| JP4679179B2 (en) | 2011-04-27 |
| CN1829288B (en) | 2010-09-22 |
| CN101094328A (en) | 2007-12-26 |
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