CN101246251A - Imaging lens position control device - Google Patents

Abstract

When an object contains a plenty of edge components such as a forest, the image having the highest total of differentiation values of the luminance value may not be an image focused on what is intended by a person who is performing imaging. Moreover, when the point to be focused is unclear, there is no principle for deciding which of the focusing lens positions obtained from the image of a large-frame area is to be employed. For this, there is provided an imaging lens position control device for holding information on high-frequency component distribution at the candidate focus lens positions and selecting information which is considered to have the optimal distribution among the plurality of distribution information, thereby controlling the focus lens position for imaging. Moreover, the imaging lens position control device can improve the processing accuracy for focusing and reduce the processing load by making the focus lens position focused according to a small-frame area reference as an imaging lens position.

Description

Imaging lens position control device

The application is dividing an application of following application:

Denomination of invention: imaging lens position control device

International filing date: on September 3rd, 2004

Application number: 200480025999.X

Technical field

The present invention relates to the control of the condenser lens position of digital camera, digital camera etc.

Background technology

In the past, be autofocusing at the function on the body that is taken, the auto-focus function of so-called camera about with camera shooting the time, disclosed various technology.One of them is so-called Contrast Detection mode, and this is a mode of " focus state " being regarded as " contrast is state clearly ".

As object lesson of this mode, at first, the signal of video signal that takes out from imaging apparatuss such as CCD, information as the expression contrast, pay particular attention to the differential of brightness value, when condenser lens (below, the lens that are used for focusing on are called condenser lens) when being positioned at a certain ad-hoc location, calculate the differential of all brightness values in this photography zone, and calculate the summation of the differential of this brightness value, being mapped makes curve, seeks the position of focusing according to the maximum value of this curve to make the summation of differential of this brightness value and the condenser lens position corresponding with it (below, the position of the condenser lens that focuses on is called the condenser lens position).This be because, the little and big relation of the summation differential value of brightness value when focusing on of the summation of the differential value of the brightness value of whole image when generally having out-focus.

In fact, for example when trying to achieve this curve, with very little spacing the condenser lens rotation being moved on one side on one side samples to brightness value, and then, press the condenser lens position, brightness value according to sampling calculates the summation of the differential of brightness value in real time, by carrying out same operation repeatedly by the condenser lens position, thereby can obtain the relation curve of the summation of condenser lens position and brightness value differential.And, in this curve, with the point of maximum value (below be called peak point) as the condenser lens position that focuses on.

But there are some problems in this technology, is exactly that this curve has a plurality of peak values sometimes.For example, when there is the people front and when in background after a while car being arranged, has the peak point on the personage in front of focusing on and then focus on two peak points of the peak point on the car of position after a while in addition.If the condenser lens position that focuses on is 1, is that peak point is 1 then do not have the problem of focusing, still, when having a plurality of peak point, focus on especially difficulty.

For fear of this problem, various methods have been proposed.One of them is the technology of patent documentation 1.As the zone that just is used for representing the scope on the brightness calculation, in the photography zone, set extensive area and 2 regional among a small circle zones, obtain the summation of differential value of the brightness value of all pixels that comprise in each zone, and obtain respectively and extensive area and the corresponding curve in zone among a small circle by the step identical with above-mentioned Contrast Detection mode.Use this 2 curves, can address the above problem.

Certainly, because above-mentioned 2 curves are to obtain from different zones, so the shape difference of this curve.Generally, the peak point of the curve in zone is few among a small circle.Therefore, in a plurality of peak points that obtain from the curve of extensive area, 1 condenser lens position can be selected thus in the auxiliary condenser lens position that also can focus in zone among a small circle that utilizes from the condenser lens position of a plurality of focusing.

[patent documentation 1] spy opens flat 3-256017 communique

But, the image that the value of contrast-data is the highest, be that the highest image of summation of the differential value of brightness value not necessarily focuses on the image on the object that the cameraman wants to take.For example, in the image that is taken, the body that is taken that has Mr. A and the fence that constitutes by a lot of root poles or post group, forest etc. to comprise a lot of marginal elements as the body that is taken at its rear.So, because of the contrast-data of many fences of the marginal element at its rear etc. big, so in above-mentioned Contrast Detection mode, might focus on the fence etc. at its rear, want Mr. A of the body that is taken taken then can not be filmed or the like well as the cameraman originally.This is because utilize contrast-data to determine only to focus on a condenser lens position on the point.Therefore, for example exist as described above on the personage in front of wanting to focus on or want to shoot whole structure blurred image etc. can not with various situations or cameraman's corresponding, so-called the 1st problems such as intention.

In addition, in patent documentation 1 disclosed technology, use a plurality of Contrast Detection zone (extensive area, zone) among a small circle and the condenser lens position that focuses on is decided a bit as candidate.But, because of when determining the condenser lens position, not considering the distribution situation of radio-frequency component (contrast composition), so still there is the problem that can not according to circumstances freely select focus equally.In addition, the moment that in zone among a small circle, obtains maximum-contrast be judged as focusing because be, so, also exist when zone among a small circle and comprise being taken during body of different distance, just before the same with the zone of introducing 2 scopes of size, can focus on the problem that cameraman waits the phenomenon on the body of not wishing to take that is taken.

In addition, if consider the actual conditions of photography, above-mentioned patent documentation 1 disclosed technology also exists in order to obtain the condenser lens position of focusing, to handle the big large-scale condenser lens position of load in order obtaining, and can to increase the 2nd problem of the load of processing.That is, on experience, the body that is taken that focus on caught in the zone among a small circle.That is to say that photography generally is to have the body of wanting to take that is taken to focus on it then earlier to take, but carries out in the method for focusing in above-mentioned extensive area, which will focus on be taken on the body because of indeterminate, so can not focus on.

In addition, as long as the body that is taken as reference object is focused on, just can reach the purpose of photography.Like this, above-mentioned extensive area and among a small circle the zone two sides irrationality of carrying out data processing just displayed.Not as preferentially focusing in extensive area, Qu Yu data are only as the reference of complementary ground, so focus on the difficulty that becomes among a small circle.

And then, the condenser lens position that a plurality of focusing are arranged in extensive area, and when in zone among a small circle, not having the condenser lens position of clear and definite focusing, just can not judge and from the condenser lens position of a plurality of focusing of extensive area, select which condenser lens position for well.Like this, just, the chance that has lost the camera meeting and tripped.

Summary of the invention

Therefore,, only determine any as the condenser lens position certainly, before this decision, keep radio-frequency component distributed intelligence as a plurality of condenser lenses position of candidate though imaging lens position control device of the present invention is final in order to solve above-mentioned the 1st problem.Then, from a plurality of of this maintenance and the relevant information that distributes, select and think that distributing is only information, be used to the control of the condenser lens position of photographing thus.That is, the invention is characterized in: keep the distributed intelligence of a plurality of radio-frequency components and it can be selected by the peak focus lens position.

As concrete structure, the 1st imaging lens position control device has: peak focus lens position information obtaining section, obtain the peak focus lens position information in the regulation zone in the above-mentioned frame; The 1st accumulation portion, the radio-frequency component distributed intelligence of the condenser lens position that the peak focus lens position information that peak focus lens position information obtaining section is obtained and this peak focus lens position information are represented is accumulated explicitly; Selection information obtaining section obtains selection information according to the radio-frequency component distributed intelligence of accumulating in the 1st accumulation portion, wherein should selection information is the information which radio-frequency component distributed intelligence of accumulating in the 1st accumulation portion has been selected in expression; And photographic lens determining positions portion, decide the photographic lens position by the selection information that obtains by the information of selection obtaining section.

In addition, as the method that solves above-mentioned the 2nd problem, the imaging lens position control device below having invented.That is, have: the signal of video signal obtaining section, obtain signal of video signal the extensive area in the zone of photographing and the zone among a small circle as the part of extensive area explicitly with the condenser lens position; The contrast information obtaining section obtains the contrast information that the information of contrast is represented in conduct explicitly with above-mentioned condenser lens position from above-mentioned signal of video signal; Peak focus lens position information obtaining section obtains peak focus lens position information, and wherein this peak focus lens position information is the condenser lens position of peak value is represented in expression by above-mentioned contrast information contrast information; And photography condenser lens determining positions portion, the condenser lens position that decision is suitable for photographing, above-mentioned photography condenser lens determining positions portion obtains under the situation of peak focus lens position information in above-mentioned zone among a small circle, decide photography condenser lens position according to this peak focus lens position information, do not obtain under the situation of peak focus lens position information in above-mentioned zone among a small circle, decide photography condenser lens position according to the peak focus lens position information of above-mentioned extensive area.

By taking the 1st imaging lens position control device of said structure, keep the distributed intelligence of a plurality of radio-frequency components in frame by the peak focus lens position, automatically or by people's selective focus lens position arbitrarily from candidate's condenser lens position, thus, can determine the photographic lens position.For example, when the body that is taken that will take as the cameraman is placed on central authorities, utilize this distributed intelligence, radio-frequency component is distributed in the condenser lens position of central authorities as the photographic lens position, and so on.Like this, can keep and select a plurality of distributed intelligences by the peak focus lens position as the candidate, thus, even in frame, also have the body that is taken of strong other of marginal element, also can focus on exactly on the body that is taken that will take except the body that is taken that will take.

In addition, if according to the 2nd imaging lens position control device, because the condenser lens position that will focus in zone among a small circle is as the photographic lens position, so, can improve and focus on the correctness of handling, in addition, though for extensive area and among a small circle the zone obtain the condenser lens position of focusing among both, and the load that makes processing becomes big, but since the condenser lens position of considering in zone among a small circle, to focus on as the photographic lens position, just can solve so the load of handling is less, focusing accelerates, and then, by shortening focal time, can play the good effects such as chance that can not lose the camera meeting or trip.

Have, camera of the present invention (camera) not only comprises the camera of taking still frame again, all cameras that video camera that also comprises shooting motion for example etc. utilizes lens to focus on.

Description of drawings

Fig. 1 is that expression utilizes the imaging lens position control device of embodiment 1 and the photo that focuses on and utilize existing autofocus mechanism and the figure of the photo that focuses on.

Fig. 2 is the figure of function square frame of the imaging lens position control device of expression embodiment 1.

Fig. 3 is used for illustrating the figure that obtains a routine flow process of peak focus lens position information in the peak focus lens position information obtaining section of imaging lens position control device of embodiment 1.

Fig. 4 is the figure as the CMYG signal of signal of video signal that is used for illustrating that the signal of video signal obtaining section of imaging lens position control device of embodiment 1 is obtained.

Fig. 5 is the process flow diagram of a routine treatment scheme in the imaging lens position control device of expression embodiment 1.

Fig. 6 is the figure of notion of scanner that is used for illustrating the imaging lens position control device of embodiment 2.

Fig. 7 is the figure that a routine integration amount of the imaging lens position control device of expression embodiment 2 increases information.

Fig. 8 is the figure that is illustrated in the scanning amount information of the condenser lens position image that has focused among the embodiment 2 on the personage that will take.

Fig. 9 is the figure that is illustrated in the scanning amount information that has focused on the condenser lens position image on the house that is not the object that will focus among the embodiment 2.

Figure 10 is the figure that is illustrated in the distance of the centre of gravity place of embodiment 2 medium-high frequency compositions and assigned position.

Figure 11 is the figure that the radio-frequency component distributed intelligence accumulated shows as image in the 1st accumulation portion of an example with imaging lens position control device of expression embodiment 2.

Figure 12 is the figure of function square frame of the imaging lens position control device of expression embodiment 3.

Figure 13 is the figure with the relation of the radio-frequency component index of the 2nd accumulation portion accumulation of the routine imaging lens position control device of graphical representation embodiment 3 and peak focus lens position.

Figure 14 is the process flow diagram of a routine treatment scheme in the imaging lens position control device of expression embodiment 3.

Figure 15 is the concept map of the relation of the expression body that is taken that possesses the camera of imaging lens position control device of embodiment 4 and shooting.

Figure 16 be in the imaging lens position control device of expression embodiment 4 extensive area and among a small circle the zone reach the concept map of contrast information separately.

Figure 17 is the figure of a routine function square frame in the imaging lens position control device of expression embodiment 4.

Figure 18 is the concept map of obtaining from the signal of video signal to the contrast information in the contrast information obtaining section of the imaging lens position control device of embodiment 4.

Figure 19 is the related concept map of contrast information and condenser lens position in the contrast information obtaining section of the imaging lens position control device of embodiment 4.

Figure 20 is the figure of function square frame of imaging lens position control device of the routine input luminance signal of expression embodiment 5.

Figure 21 is the figure of function square frame of imaging lens position control device of the example input rgb signal of expression embodiment 6.

Figure 22 is the figure of function square frame of imaging lens position control device of the example input CMYG signal of expression embodiment 6.

Figure 23 is the zone and the concept map of extensive area among a small circle in the imaging lens position control device of expression embodiment 7.

Figure 24 is the figure of the combination of the configuration change that has or not among a small circle zone and extensive area of the example in the imaging lens position control device of expression embodiment 8.

Figure 25 is the zone among a small circle in the imaging lens position control device of expression embodiment 9 and the concept map of the aspect ratio of extensive area.

Figure 26 is illustrated in to have disposed a plurality of concept maps in zone among a small circle in the imaging lens position control device of embodiment 10 in extensive area.

Figure 27 is illustrated in the concept map that an example in the imaging lens position control device of embodiment 11 is configured in the shape of a plurality of extensive area in the photography zone.

Figure 28 is the figure of function square frame that the example of expression embodiment 12 has the imaging lens position control device in medium range zone.

Figure 29 is the concept map in medium range zone of the imaging lens position control device of embodiment 13.

Figure 30 is the concept map in a plurality of medium range zone of the imaging lens position control device of expression embodiment 14.

Embodiment

Below, use the description of drawings embodiments of the present invention.Have again, the invention is not restricted to these embodiments, in the scope that does not break away from its aim, can implement by variety of way.

Have, embodiment 1 mainly describes with regard to the 1st, 11,12,13,14 of the invention scheme again.Embodiment 2 mainly describes with regard to the 2nd, 3,4,5,6,7,8,9 of the invention scheme.Embodiment 3 mainly describes with regard to the 10th, 11,12,13,15 of the invention scheme.This embodiment 1～3 describes with regard to the 1st imaging lens position control device.

In addition, embodiment 4 mainly describes with regard to invention scheme 16 grades.Embodiment 5 mainly describes with regard to invention scheme 17 grades.Embodiment 6 mainly describes with regard to invention scheme 18 and invention scheme 19 etc.Embodiment 7 mainly describes with regard to invention scheme 20 grades.Embodiment 8 mainly describes with regard to invention scheme 21 grades.Embodiment 9 mainly describes with regard to invention scheme 22 grades.Embodiment 10 mainly describes with regard to invention scheme 23 grades.Embodiment 11 mainly describes with regard to invention scheme 24 grades.Embodiment 12 mainly describes with regard to invention scheme 25 grades.Embodiment 13 mainly describes with regard to invention scheme 26 grades.This embodiment 4～13 describes with regard to the 2nd imaging lens position control device.

Below, at first enumerate embodiment the 1st imaging lens position control device is described.

(embodiment 1) (notion of embodiment 1) Fig. 1 is that expression utilizes the photo (a) that the imaging lens position control device of present embodiment focus on to take and utilizes existing autofocus mechanism to focus on the figure of photo (b) of the body that is taken of the undesirable mistake of cameraman.As shown in the drawing, utilize the imaging lens position control device of present embodiment, can shoot the photo on the body that is taken that as photo (a), focuses on hope exactly, rather than as photo (b), focus on the photo on " house " that is not the desirable body that is taken of cameraman.

(structure of embodiment 1) Fig. 2 is the figure of function square frame of the imaging lens position control device of expression present embodiment.As shown in the drawing, the imaging lens position control device of present embodiment (0200) is the distribute imaging lens position control device of the control that is used to focus on of the radio-frequency component according to signal of video signal in the corresponding frame that obtains with the condenser lens position, and it has: " peak focus lens position information obtaining section " (0201), " the 1st accumulation portion " (0202), " selecting the information obtaining section " (0203) and " photographic lens determining positions portion " (0204).

" signal of video signal " is that expression utilizes light intensity that lens are caught etc. to be transformed into the CCD of electric signal or signals such as color that camera devices such as cmos image sensor, color filter generate or brightness in the 1st imaging lens position control device.This signal of video signal for example can be enumerated as the YUV signal of representing the signal of color with poor (V) these 3 information of poor (U), luminance signal and the red composition of luminance signal (Y), this luminance signal and blue composition, or the rgb signal that color is showed as red (R), green (G), blue (B) trichromatic combination or expression are as the CMYG of the cyan (indigo plant) of complementary color relation, magenta (red), yellow (Huang), green (green) these 4 kinds of colors etc.In addition, for example the obtaining as previously mentioned of this signal of video signal, by devices such as CCD or cmos image sensors, the light intensity that photodiode etc. will be taken in each pixel of body is transformed into luminance signal signal of video signal such as (Y), obtains again.In addition, " radio-frequency component " of this signal of video signal is meant when with this signal of video signal of frequency representation gets the composition of the value more than the setting, for example, can obtain by signal of video signal is waited by bandpass filter.

Have again, the distribution that why will get radio-frequency component like this in the present embodiment, it be the reasons are as follows.That is, for the details that connects the body that is taken when focusing on can both correctly show, necessary enhancing contrast ratio in order to approach reality, needs the short waveform of wavelength,, needs radio-frequency component that is.On the other hand, in order to make whole image fog when the out-focus, make its waveform, be that low-frequency component constitutes by the long wavelength.Therefore,, only extract the radio-frequency component of signal of video signal out,, then can obtain the outstanding curve of peak point if only use this radio-frequency component to try to achieve above-mentioned curve by bandpass filter.That is, we can say,, just can access the curve of easy focusing by adopting the radio-frequency component of signal of video signal.

In addition, we can say according to the reason of above-mentioned record and can utilize the integrated value of the radio-frequency component in the frame to represent the height of the contrast in this photography zone.Therefore, the integrated value of the radio-frequency component of this signal of video signal becomes the information of the contrast in the example expression frame described later.

In addition, " condenser lens " can be in order to focus on the body that is taken and the lens that its position is moved in camera, and can certainly not limit is 1 but the lens combination of polylith focus unanimity." condenser lens position " is meant the position of the condenser lens in the camera mechanism of camera, for example is with the umber of pulse of electrode or the information of revolution or actual numeric representations such as distance of moving." frame " is meant the zone of obtaining signal of video signal for shooting, and be roughly the same with the meaning of " photography zone " in the 2nd imaging lens position control device.

" peak focus lens position information obtaining section " (0201) has the function that obtains peak focus lens position information." peak focus lens position information " is the information of the condenser lens position of the integrated value of the above-mentioned radio-frequency component in the regulation zone (certainly, this regulation zone also can be identical with frame) in the above-mentioned frame of expression when being peak value.

Fig. 3 is used for explanation to obtain the figure of a routine flow process of this peak focus lens position information.This illustrates the method for the luminance signal of pixel being carried out Fourier transform processing as frequency content.As shown in the drawing, at first, utilize imaging apparatuss such as CCD from the light of the image by condenser lens, to obtain luminance signal as signal of video signal.Secondly, in the frequency extracting circuit, from the image that utilizes CCD to obtain, extract luminance signal (shown in 1 among Fig. 3, below same) out as frequency content.Then, in Fourier transform circuit, the frequency content of this luminance signal is carried out Fourier transform (2).And then, make luminance signal behind the Fourier transform by bandpass filter (3), extract the radio-frequency component (4) of this frequency content out.Then, obtain the integrated value (5) in the scope (vertical line part) of in scope integrated value counting circuit, extracting out, and this integrated value and lens position are made curve map (6) explicitly.

And, as mentioned above, because of can from the integrated value of the radio-frequency component of signal of video signal, obtaining the very clear and definite curve of peak point, be fit to the condenser lens position taken so can decide according to this integrated value that makes curve map.

And, here, be the peak value of obtaining integrated value in condenser lens position alpha on the personage who focuses on the front and the place, β two place, condenser lens position on the house that focuses on the rear.And, in the decision of the photographic lens position of prior art, because the condenser lens position is as the photographic lens position, so decision is the condenser lens position on the house that focuses on the rear sometimes when this integrated value is maximal value.But, in the present invention, utilize this peak focus lens position information obtaining section to obtain and two condenser lens positional informations that peak point is relevant, (accumulating explicitly because of distributing with radio-frequency component described later) can be selected automatically or arbitrarily.

" the 1st accumulation portion " (0202) has the function that the radio-frequency component distributed intelligence of the condenser lens position shown in peak focus lens position information that peak focus lens position information obtaining section (0201) is obtained and this peak focus lens position information is accumulated explicitly." radio-frequency component distributed intelligence " is the information of the distribution of expression radio-frequency component, for example, be the information that the value with the intensity of the radio-frequency component of information of the locations of pixels in the presentation graphs picture frame (distributing to the only identification serial number of pixel or the residing pixel count in length and breadth of this pixel etc.) and signal of video signal associates.

Like this, by peak focus lens position information and radio-frequency component distributed intelligence are accumulated explicitly, can judge the radio-frequency component at each peak focus lens position place distribution, be the contrast distribution state in the frame.

(0203) has the function that obtains selection information according to the radio-frequency component distributed intelligence of accumulation in the 1st accumulation portion (0202) " to select the information obtaining section "." selection information " is in order to determine to generate automatically as the photographic lens position of the condenser lens position of be fit to taking or optional information such as cameraman, for example, can enumerate the information that expression is chosen in which radio-frequency component distributed intelligence of accumulating in the 1st accumulation portion.Perhaps, can also enumerate have the meaning identical with it, for example the information or be used for of the condenser lens position selected of expression is discerned their information etc.Have again, select the generation that also comprises the such selection information of aftermentioned that obtains of information.

Below, an example that obtains selection information in this selection information obtaining section is described.At first, in above-mentioned peak focus lens position information obtaining section, obtain 2 peak focus lens position information.Then, this radio-frequency component distributed intelligence of 2 be accumulated in the 1st accumulation portion after peak focus lens position separately is related.Therefore, though can select to handle according to the radio-frequency component distributed intelligence of accumulating in the 1st accumulation portion, this selection also can obtain by artificial input.Perhaps, this selection also can utilize machinery to select automatically.In addition, the determination means that this machinery selection for example can utilize the imaging lens position control device of present embodiment itself to have determines, perhaps, also can be connected with other computing machines or camera, determine according to some information of selection wherefrom (for example from the range information of distance-measuring equipment or from the Weather information on the Internet etc.) by the Internet or cable etc.Have again,, in the explanation of embodiment 2, also comprise the example of obtaining by generating about other examples of obtaining of the selection information of this selection information obtaining section.

" photographic lens determining positions portion " (0204) has according to being accumulated in the function that peak focus lens position information in the 1st accumulation portion decides the photographic lens position explicitly with the radio-frequency component distributed intelligence, and wherein this radio-frequency component distributed intelligence is that expression is by the selected radio-frequency component distributed intelligence of selection information of selecting information obtaining section (0203) to obtain.Like this, by distributed intelligence obtains selection information and according to this selection information decision photographic lens position according to radio-frequency component, can determine image focu to wish such condenser lens position on the part at the body place that is taken taken the cameraman thus.Have, " photographic lens position " is meant the condenser lens position that is suitable for photographing again, with " photography condenser lens position control " synonym of the 2nd imaging lens position control device.

(example of the signal of video signal of present embodiment) has again, in the above description, as signal of video signal, used luminance signal.This is because consider that luminance signal is the signal that can show the peak value of above-mentioned integrated value.Certainly, as signal of video signal, except this luminance signal, can also utilize chrominance signal or the CMYG signal represented by RGB as described above.For example, chrominance signal RGB can utilize transforms such as " Y=0.299R+0.587G+0.114B " to be transformed into brightness signal Y.Therefore, the above-mentioned transform of favourable usefulness calculates the value of luminance signal and obtains method of contrast information etc. from rgb signal.

In addition, Fig. 4 is the figure that is used for illustrating the CMYG signal.As shown in the drawing, cyan (indigo plant) is a blue-green, and magenta (red) is red-blueness, and yellow (Huang) is green-redness.And, from closing, 4 colour cells of these CMY 3 looks having been added green (green) deduct color separately, can be partitioned into RGB.For example, when trying to achieve redness, redness=yellow-green, the calculating formula of redness=magenta-blueness is set up.The complementary color CCD that is used for obtaining this CMYG signal and photographs is adopted by the digital camera of emphasis sensitivity sometimes because of the highly sensitive former of reaction to light.Therefore, the present invention also imagination this CMYG signal is obtained as signal of video signal.

(treatment scheme of embodiment 1) Fig. 5 is the process flow diagram of a routine treatment scheme of expression present embodiment.In addition, the recording medium that can read that the treatment scheme that illustrates below can be used as method, be used for the program of carrying out at computing machine or record this program is implemented.As shown in the drawing, at first, obtain peak focus lens position information (step S0501), secondly, (step S0502) accumulated in the radio-frequency component distributed intelligence of the condenser lens position shown in the peak focus lens position information that will obtain in above-mentioned steps S 0501 and this peak focus lens position information explicitly.Then, the radio-frequency component distributed intelligence according to above-mentioned steps S0502 accumulation obtains selection information (step S0503).At last, the selection information decision photographic lens position (step S0504) by in above-mentioned steps S0503, obtaining.

(other examples of embodiment 1) in addition, though in the above-described embodiments, the radio-frequency component distributed intelligence of accumulation peak condenser lens position in the 1st accumulation portion, but also can be with the mode of the radio-frequency component distributed intelligence of other condenser lens positions outside the peak focus lens position with separately the related accumulation of condenser lens positional information.Though this needs more accumulator, can increase the candidate condenser lens position as the photographic lens determining positions.Therefore, for the photo of integral body fuzzy (out-focus) or only focus on photo on the body that is taken of distant place in picture corner etc., can further determine the condenser lens position in conjunction with various situations.

(simple declaration of the effect of embodiment 1) by present embodiment, can focus on the body that is taken that the cameraman wishes as described above, perhaps can focus on according to various situations.

(embodiment 2) (notion of embodiment 2) in the present embodiment, the embodiment that has feature aspect the generation of the selection information of the selection information obtaining section of the imaging lens position control device of the embodiment 1 that illustrates in above-mentioned explanation.

(structure of embodiment 2) here, in order to generate selection information, " selecting the information obtaining section " has " radio-frequency component index computing unit " and " the interdependent selection information generating unit of radio-frequency component index ".And " radio-frequency component index computing unit " has the function of calculating the radio-frequency component index.

" radio-frequency component index " be illustrated in frame in the distribution of radio-frequency component under the relation of assigned position, for example, can be with the value of the distance dependent of distance assigned position (for example, the value of negative 1 power of distance) with the value of the product of the value (for example, the value of the size of expression radio-frequency component) relevant etc. with the intensity of the radio-frequency component of this position.Therefore, for example if know distance, just can judge how near the radio-frequency component of picture centre still leaves near the radio-frequency component in center and wait state more as the distance of the central point of the image of assigned position and the intensity of the radio-frequency component under this distance.Then, utilize " the interdependent selection information generating unit of radio-frequency component index ", and generate selection information according to the radio-frequency component index.Below, the generation example of this selection information is described.

(one of generation example of selection information) at first, in the generation example of explanation, above-mentioned radio-frequency component index computing unit has scanner.Should " scanner " have the intensity of radio-frequency component is scanned in the position of will stipulate in the frame as the scanning starting position function.And, as shown in Figure 6, as the position of regulation, if will " central point of frame " as scanning the starting position, then scanner for example begins to be vortex shape from this central point and obtains the radio-frequency component distributed intelligence.Thus, the radio-frequency component index that begins from central point can be calculated, the distribution of the radio-frequency component that begins from central point can be known.Therefore, when being taken during body of will taking arranged, when for example radio-frequency component refers to that target value is big, can judge that the big peak focus lens position of this value is exactly the condenser lens position that should select near the center.That is, by adopting such method, can shoot the image that focuses on exactly on this body that is taken.

Certainly, though for equally with the situation of central point as the scanning starting position, also can at first begin to carry out linear sweep with other angle and then, and repeat above-mentioned steps, thereby scan to the fixed distance of the linear scanning rule of certain direction from central point.

Perhaps, equally as shown in Figure 6, also can be the mode of scanner from beginning to scan in order as upper left side in the frame of the position of stipulating.The CCD that most digital cameras adopt detects (output) photographic element (pixel) by passing the signal of video signal that bucket mode (BucketRelay) obtains by row on its structure, so at this moment, can adopt such scan method.

In addition, this photographic lens control device also can have set this assigned position, be " the assigned position configuration part " of the scanner position (scanning starting position) that begins to scan.Utilize this assigned position configuration part, for example cameraman etc. can specify this scanning starting position arbitrarily, and therefore, the imaging lens position control device of present embodiment can focus on the locational body that is taken in the frame according to cameraman's hobby.Have again, can enumerate: the establishing method of being selected " central focus pattern " or preprepared various modes such as " left end focusing modes " by the cameraman for example can be used in this assigned position configuration part, or cameraman's pilot guide carries out the establishing method of appointment etc. on display.Perhaps, also can and utilize imposing a condition or imposing a condition to wait automatically and set by microprocessor based on the data of accumulation or empirical rule because of what factors such as weather changed.

And in generating one of example, in order to know the distribution of radio-frequency component, radio-frequency component index calculating part calculates integration amount and increases information." integration amount increase information " be meant as the radio-frequency component index expression along the information that the integrated value of the radio-frequency component of the signal of video signal of the scanning pattern of scanner increases, and for example is the slope etc. of integrated value of the radio-frequency component of signal of video signal.And the feature of " the interdependent selection information generating unit of radio-frequency component index " is to generate selection information, and this selection information increases the Information Selection integrated value according to this integration amount and increases maximum radio-frequency component distributed intelligence.

Fig. 7 illustrates the figure that this integration amount of example increases information.As shown in the drawing, on the x of condenser lens position, slope of a curve (rate of change of integrated value) is big, that is, along with scanning position for example leaves center as the position of regulation, the integrated value of radio-frequency component increases significantly.On the other hand, on the y of condenser lens position, slope of a curve (comparing with x) is little, that is, along with scanning position leaves the center, the integrated value of radio-frequency component only increases very a little bit smaller.And, remaining condenser lens position is carried out too, it is increased generating as selection information of slope maximum.At this moment, by in certain certain scope of scanning pattern, getting the rate of change (slope) of integrated value, for example can calculate the rendezvous value (integrated value) of the intensity of the radio-frequency component near the specialized range of the band central authorities etc.By come relatively this rendezvous value by the condenser lens position, can generate selection information with the stronger condenser lens position of the contrast that decides near near assigned position (center in this example) to locate.

(select information the generation example two) this generation example two also use above-mentioned " scanner " that has illustrated.Specifically, it is characterized in that: calculate scanning amount information as the radio-frequency component index, utilize " the interdependent selection information generating unit of radio-frequency component index " to generate the selection information of the radio-frequency component distributed intelligence of selection scanning amount information minimum." scanning amount information " is meant the information of the scanning amount of the scanner of the maximal value of the radio-frequency component of expression signal of video signal before occurring, and for example, can be the value etc. of the pixel count of scanning before the maximal value of the radio-frequency component of signal of video signal occurs.

Fig. 8 is the figure of the scanning amount information of the image under the condenser lens position of representing to focus on the personage that will take.As shown in the drawing, for example, when central point was vortex shape scanning as the position of stipulating, the relation of the intensity of scanning amount and radio-frequency component can be drawn as the curve shown in figure below.On the other hand, Fig. 9 is the figure of the scanning amount information of the image under the condenser lens position of representing to focus on the house that is not the object that will focus on.As shown in the drawing, when equally central point being vortex shape scanning as the position of stipulating, the relation of the intensity of scanning amount and radio-frequency component can be drawn as the curve shown in figure below.Like this, contrast by force, promptly focuses on and the strong body portion that is taken (image section) of marginal element shows very strong radio-frequency component as mentioned above, so, when when central point begins to scan, in near the frame of the body that is taken focusing on central point, the maximal value of radio-frequency component earlier, promptly appears in few stage of scanning amount.Therefore, generate in the example, also can generate the selection information that focuses on the condenser lens position near the object of assigned position with deciding at this.

Certainly, if focus on the house, the assigned position as the scanning starting position can be set in the upper left side.Have again,, can temporarily entire frame be scanned, just can know maximal value etc., can obtain maximal value thus according to its result in advance maximal value being set under the suitable situations such as value that rule of thumb rule etc. draws.

(select information the generation example three) three being characterised in that of this generations example: the radio-frequency component index is the center of gravity deviation information, and this center of gravity deviation information of " the interdependent selection information generating unit of radio-frequency component index " generation selection is represented the selection information of the radio-frequency component distributed intelligence of minimum value." center of gravity deviation information " is meant the information of the distance of expression centre of gravity place of radio-frequency component and assigned position.The example that this center of gravity deviation information calculates is with as the value Pi of the direction of expression each point (pixel) with represent the value Mi of intensity (integrated value of Mi * Pi) is divided by the method for the integrated value of Mi.

Figure 10 is the figure of the distance of expression centre of gravity place of radio-frequency component and assigned position.As shown in the drawing, when the strong object of radio-frequency component was arranged near the center, the centre of gravity place of this image became the position shown in the some b1 of Figure 10 (1).On the other hand, when the strong object of radio-frequency component was arranged near the edge, the centre of gravity place of this image became the position shown in the some b2 of Figure 10 (2).Therefore, if the position of regulation is made as central point a, represent that then the center of gravity deviation information of the distance between a-b represents that this side of Figure 10 (1) presents less value.Therefore, this generation example can generate the selection information that focuses near the condenser lens position of assigned position with deciding.

The example that obtains that (other select the example that obtains of information) the following describes is characterised in that: by waiting the locational image of each condenser lens of prompting to the cameraman as the operator, make the operator select the condenser lens position of wishing, and obtain this selection information.Specifically, select the information obtaining section to have " radio-frequency component distributed image display unit " that the radio-frequency component distributed intelligence with the accumulation of the 1st accumulation portion shows as image.And, be characterised in that: in " selection input block ",, obtain selection information there from the operator according to the radio-frequency component distributed image that above-mentioned radio-frequency component distributed image display unit shows.

Figure 11 to be expression one example show the radio-frequency component distributed intelligence of the 1st accumulation portion accumulation as image figure.As shown in the drawing, according to carrying out inverse operation, binary image is being shown as on the LCD of the camera of radio-frequency component distributed image display unit etc. by the size of the radio-frequency component of each position in regulation zone in the frame of the radio-frequency component distributed intelligence of each condenser lens position indication.The cameraman sees this image, to selecting input block input indication, if focus on then input (a) on the personage, if focus on then input (b) on the house.Thus, the cameraman can be from visually judging the focusing situation of condenser lens position, thereby select desirable condenser lens position.

Certainly, the image of demonstration can not be a binary image also, but has the image with equal color performance of actual photographed image etc.At this moment, can accumulate again by the colouring information that makes the radio-frequency component distributed intelligence comprise each position and realize.Therefore, originally obtain example if use, can provide existing autofocus camera unexistent, shoot the function of the photo that deliberately defocuss easily.

(simple declaration of the effect of embodiment 2) can utilize the whole bag of tricks to generate, obtain selection information as mentioned above, therefore, can meet the photography of various needs and situation.

(embodiment 3) (notion of embodiment 3) present embodiment is characterised in that: unlike the imaging lens position control device of embodiment 1, accumulation according to the position in the frame represent the information of the distribution of radio-frequency component, promptly as 2 the dimension information the radio-frequency component distributed intelligence, but be accumulated in frame in the distribution of expression radio-frequency component under the relation of assigned position information, promptly as the radio-frequency component index of 1 dimension information, so, also have the function that reduces to accumulate amount of memory.In embodiment 1,, must accumulate for the radio-frequency component distributed intelligence under each condenser lens position of more a plurality of peak focus lens positions or regulation.Therefore, the tired calculation of its amount of memory increases, so, by reducing to accumulate amount of memory, small-sized, light and cost degradation that can implement device etc.

(structure of embodiment 3) Figure 12 is the figure of function square frame of the imaging lens position control device of expression present embodiment.As shown in the drawing, the imaging lens position control device of present embodiment (1200) has " peak focus lens position information obtaining section " (1201), " radio-frequency component index calculating part " (1202), " the 2nd accumulation portion " (1203), " selecting the information obtaining section " (1204) and " photographic lens determining positions portion " (1205).Have again, because of " peak focus lens position information obtaining section " (1201), " select information obtaining section " (1204) and " photographic lens determining positions portion " (1205) on the books in the foregoing description 1, its explanation of Therefore, omited.

In addition, " radio-frequency component index calculating part " (1202) and embodiment 2 records identical, " the 2nd accumulation portion " (1203) have the radio-frequency component distributed intelligence in the 1st accumulation portion that replaces embodiment 1 explanation and the function of the radio-frequency component index that will be calculated by radio-frequency component index calculating part and the related accumulation of peak focus lens position.Figure 13 is the figure with the relation of the radio-frequency component index of graphical representation one example the 2nd accumulation portion accumulation and peak focus lens position.Like this, peak value appears in the radio-frequency component index in the time of on focusing on certain body that is taken, and for example obtains this radio-frequency component index that presents peak value as selection information in the information of selection obtaining section.

(treatment scheme of embodiment 3) Figure 14 is the process flow diagram of a routine treatment scheme of expression present embodiment.As shown in the drawing, at first, obtain peak focus lens position information (step S1401).In addition, calculate radio-frequency component index (step S1402).Secondly, the peak focus lens position information that will obtain in above-mentioned steps S1401 is in the related accumulation of the radio-frequency component index of calculating among the above-mentioned steps S1402 (step S1403) with the condenser lens position of this peak focus lens position information indication.Then, the radio-frequency component index according to above-mentioned steps S1403 accumulation obtains selection information (step S1404).At last, utilize the selection information decision photographic lens position of in above-mentioned steps S1404, obtaining (step S1405).

(simple declaration of the effect of embodiment 3) as described above, the imaging lens position control device of present embodiment is by the radio-frequency component index of accumulation as 1 dimension information, amount of memory can be reduced to accumulate, therefore, small-sized, light and cost degradation that for example installs etc. can be realized.

More than, the 1st imaging lens position control device has been described.

Then, enumerate embodiment below the 2nd imaging lens position control device is described.

(embodiment 4) (notion of embodiment 4) Figure 15 and Figure 16 are the figure of the notion of expression present embodiment.Present embodiment relates to the automatic focus technology of focusing such as video camera.Suppose the situation as people shown in Figure 15, house and mountain etc. are taken.Figure 16 illustrates the curve of the relation of the summation of differential of brightness value of expression signal of video signal and condenser lens position.In extensive area, shown in shooting image (b),,, therefore, represent that the curve (a) of summation of the differential of brightness value has 3 peak values so focus at 3 places because of the body that is taken has 3 kinds on people, house and mountain.Corresponding therewith, in zone among a small circle, shown in photographed images (d),,, therefore, represent that the curve (c) of summation of the differential of brightness value also has only 1 peak value so focus at 1 place because of the body that is taken has only the people.Have, here, the differential of brightness value also can be the difference of brightness value again.Apply flexibly among a small circle the characteristic in zone, the object that focuses on is wanted in seizure in zone among a small circle, and focuses on this body that is taken, and extensive area is used as supplementary means, more than is exactly the notion of present embodiment.

(structure of embodiment 4) Figure 17 is the functional-block diagram of the imaging lens position control device of present embodiment.

(one-piece construction) present embodiment is the imaging lens position control device with " signal of video signal obtaining section " (1702), " contrast information obtaining section " (1703), " peak focus lens position information obtaining section " (1704) and " photographic lens determining positions portion " (1705).

(embodiment 4 structure explanation) " extensive area " is the part in photography zone, and then, as a part of zone of extensive area " zone among a small circle " arranged.In addition, extensive area and regional among a small circle shape are not limit, and can be rectangle, square or circle etc.

" signal of video signal obtaining section " have with the condenser lens location association in the zone of photographing extensive area and obtain the function of signal of video signal as the zone among a small circle of the part of extensive area." condenser lens " is the same with condenser lens in the 1st imaging lens position control device, be meant the lens that are used for focusing on, " condenser lens position " is meant too as the condenser lens position in the camera mechanism of the video camera of camera or digital camera etc.In addition, when from extensive area with when signal of video signal is obtained in the zone among a small circle, signal of video signal and condenser lens position are associated.

" contrast information obtaining section " has the function that obtains the contrast information of the information of representing contrast with above-mentioned condenser lens position explicitly from above-mentioned signal of video signal." contrast information " is the information of expression contrast.Here, spend information as a comparison, it is from conceptive any information that can comprise following " information that is formed by the signal of video signal of obtaining from CCD ", " information that is formed by the result who this signal of video signal is carried out behind the Fourier transform ", " information that obtains after making the information that is made of the result behind this Fourier transform by bandpass filter ", " resulting result of integration that the information that obtains by this bandpass filter is stipulated " etc.

Here, utilize Figure 18 and Figure 19 to illustrate from obtaining signal of video signal, and and then enumerate various examples obtaining of contrast information is described to the flow process that obtains contrast information." obtain contrast information " and be meant the information that obtains the expression contrast.This process that obtains is as embodiment 1 record, for example, after the signal of video signal that utilizes above-mentioned signal of video signal obtaining section to obtain (Figure 18 1) carried out Fourier transform (Figure 18 2), use bandpass filter only to extract radio-frequency component (Figure 18 3) out, obtain the integrated value (Figure 18 4) of this radio-frequency component, as transverse axis, make curve map (Figure 19 5) as the longitudinal axis, thus, can obtain contrast information with the condenser lens position with the integrated value of radio-frequency component.

Have, the signal of video signal before the Fourier transform also can be " signal of video signal after the processing " that the difference from the indicating value of the signal of video signal between neighbor obtains again.Its reason is that above-mentioned " signal of video signal after the processing " compared with " unprocessed signal of video signal ", generally has the be taken tendency of marginal element of body of easy extraction.The be taken edge of body is meant profile.The variation of the brightness value of profile place image is nearly all very violent, that is, it is big that the differential of brightness value becomes.Therefore, when the differential of the indicating value that adopts the signal of video signal between neighbor during, the situation of outline portion differential value maximum can be judged as situation about having focused on as signal of video signal.Say that exactly the position of the profile and the body that is taken is unequal, but can think about equally.Therefore, when judging when the outline portion of the body that is taken has focused on, also can think on the body that is taken, also to have focused on.Therefore, carrying out Fourier transform signal before also can be " signal of video signal after the processing ".

In addition, another method that obtains contrast information is to obtain the difference of the brightness value of neighbor, respectively zone and extensive area is among a small circle obtained the relation of summation of the difference of the interior brightness value in condenser lens position and each zone.Can obtain peak point from the curve that such processing obtains.And then the difference that also only contrasts the big brightness value of this threshold value by decision threshold is got the interior summation in zone separately, can obtain having the curve of clearer and more definite peak point.This is because because the variation of the brightness value of the outline portion of the body that is taken greatly, the difference of brightness value becomes greatly.If use suitable specified threshold value and only adopt the difference of the brightness value bigger, then can extract the relevant information of difference out with the brightness value of this outline portion than this threshold value.Generally, because if the outline portion of the body that is taken on focus point, then is taken body also on focus point, so, if obtain the relevant information of summation with the difference of the brightness value of this outline portion, just can obtain contrast information.

" peak focus lens position information obtaining section " is the same with peak focus lens position information obtaining section in the 1st imaging lens position control device, has the function that replaces peak focus lens position information." peak focus lens position information " is that expression utilizes above-mentioned contrast information contrast to represent the information of the condenser lens position of peak value.For example, as shown in figure 19, the information of the condenser lens position that expression and peak value 1, peak value 2, peak value 3 are corresponding is called peak focus lens position information.

" photography condenser lens determining positions portion " decision photography condenser lens position.Photography condenser lens position is meant the condenser lens position that is fit to photography.Promptly, has following function: when in above-mentioned zone among a small circle, obtaining peak focus lens position information, according to this peak focus lens position information decision photography condenser lens position, when in above-mentioned zone among a small circle, not obtaining peak focus lens position information, according to the peak focus lens position information decision photography condenser lens position of above-mentioned extensive area.In the photography condenser lens determining positions portion of present embodiment, Qu Yu peak focus lens position information is than the peak focus lens position information priority of extensive area among a small circle.In the present embodiment, as an example, when the peak focus lens position information in zone among a small circle when being 1, can be with the peak focus lens position of trying to achieve as photography condenser lens position according to this peak focus lens position information.In addition, when the peak focus lens position information in zone among a small circle has when a plurality of, can be with the peak focus lens position of trying to achieve as photography condenser lens position according to the peak focus lens position information in front of.In addition, when when the zone does not obtain peak focus lens position information among a small circle, promptly, when the curve that obtains when the value and the condenser lens location association of above-mentioned contrast information did not form clear and definite mountain peak shape, preferentially the peak focus lens position with extensive area decided as photography condenser lens position.When the peak focus lens position information of extensive area has when a plurality of, as an example, also can with focus in front of the corresponding peak focus lens position of the state of image decide as photography condenser lens position.

(simple declaration of the effect of embodiment 4) can play the effect that can focus on exactly on the body that is taken if according to present embodiment.

(embodiment 5) present embodiment is mainly based on embodiment 4, and the signal of video signal that it is characterized in that embodiment 4 is a luminance signal.

(structure of embodiment 5) Figure 20 is the block scheme of the function of expression present embodiment.

(one-piece construction) present embodiment is " imaging lens position control device " (2001) with " signal of video signal obtaining section " (2002), " contrast information obtaining section " (2003), " peak focus lens position information obtaining section " (2004) and " photographic lens determining positions portion " (2005), it is characterized in that signal of video signal is a luminance signal.

(embodiment 5 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 4, and its explanation of Therefore, omited.And " signal of video signal " of present embodiment is luminance signal with aforesaid the same.Luminance signal is the luminance signal as a kind of composition of aforementioned signal of video signal.Have, luminance signal is except common luminance signal again, and the differential of the value of the luminance signal of neighbor is called " luminance signal after the processing ", is also contained in the above-mentioned luminance signal.

(simple declaration of the effect of embodiment 5) if according to present embodiment, has played the effect that increases the variation that is used to obtain the peak focus lens position.

(embodiment 6) present embodiment is mainly based on embodiment 4, and the signal of video signal that it is characterized in that embodiment 4 is the wantonly combination more than 1 or 2 in the rgb signal, or the wantonly combination more than 1 or 2 in the CMYG signal.

(structure of embodiment 6) Figure 21 and Figure 22 are the functional-block diagrams of expression present embodiment.

(one-piece construction) present embodiment is " imaging lens position control device " (2101) with " signal of video signal obtaining section " (2102), " contrast information obtaining section " (2103), " peak focus lens position information obtaining section " (2104) and " photographic lens determining positions portion " (2105), it is characterized in that signal of video signal is the wantonly combination more than 1 or 2 in the rgb signal (Figure 21 (A)), or the wantonly combination more than 1 or 2 in the CMYG signal (Figure 22 (A)).

(embodiment 6 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 4, and its detailed description of Therefore, omited.

" rgb signal " is the red green blue tricolor signal separately as the three elements of signal of video signal as previously mentioned." the wantonly combination more than 1 or 2 in the rgb signal " is meant in above-mentioned three primary colors, or the independent signal of RGB, or the signal of red green, red indigo plant, bluish-green two combinations, or the signal of red green blue tricolor combination.Combinations thereof be meant the indicating value to each signal be weighted after addition again.

" CMYG signal " is cyan, magenta, yellow, the green 4 kinds of colors signal separately that the complementary color relation is arranged with RGB as previously mentioned." the wantonly combination more than 1 or 2 in the CMYG signal " is meant in above-mentioned 4 kinds of colors, or blue or green, pinkish red, yellow, green independent signal, or the signal of blue or green magenta, bluish yellow, viridescent, product reddish yellow, pinkish red green, yellowish green two combinations, or blue or green product reddish yellow, blue or green pinkish red green, bluish yellow is green, the signal of pinkish red yellowish green three combinations or the signal that yellowish green four colour cells of green grass or young crops magenta are closed.Combinations thereof be meant the indicating value to each signal be weighted after addition again.

(simple declaration of the effect of embodiment 6) if according to present embodiment, has played the effect that increases the variation that is used to determine the peak focus lens position.

(embodiment 7) present embodiment is characterized in that the central part of the area configurations among a small circle of explanation among the embodiment 4 in above-mentioned extensive area mainly based on a certain embodiment among the embodiment 4 to embodiment 6.

(structure of embodiment 7) Figure 23 is the zone among a small circle of expression present embodiment and the concept map of extensive area.

(one-piece construction) present embodiment is the imaging lens position control device with signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, it is characterized in that above-mentioned zone (2302) among a small circle is configured in the central part of above-mentioned extensive area (2301).

(embodiment 7 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 1, and its explanation of Therefore, omited." zone among a small circle " is configured in the central part of extensive area.An example is that the zone is a rectangle among a small circle, and the intersection point 2305 of its diagonal line 2303 is regional among a small circle centers 2305.In addition, extensive area 2301 also is a rectangle, and same, the intersection point 2305 of its diagonal line 2304 is centers 2305 of extensive area.When zone and extensive area have this intersection point 2305 among a small circle, claim the regional among a small circle central part that is positioned at extensive area.Just, very difficult because of being arranged on proper central part, so so-called central part comprises central part roughly.But, the position of extensive area itself is not defined here.Promptly, though extensive area is in the photography zone, but be not defined by a center that fixes on the photographed region territory, so, not necessarily must be at the center in photography zone, therefore, though area configurations is at the central part of extensive area among a small circle, the zone is also not necessarily at the regional central part of photography among a small circle.

(simple declaration of the effect of embodiment 7) departs from the effect that the regional central part of photography also can focus on if according to present embodiment even can play the body that is taken that will focus on.

(embodiment 8) present embodiment is characterized in that also having the above-mentioned zone among a small circle of change or/and the configuration change portion of the configuration of extensive area mainly based on a certain embodiment among the embodiment 4 to embodiment 7.

(structure of embodiment 8) Figure 24 is the constitutional diagram that has or not the configuration change of regional among a small circle and extensive area.

(one-piece construction) present embodiment is the imaging lens position control device with signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, it is characterized in that also having changing above-mentioned zone among a small circle or/and the configuration change portion of the configuration of extensive area.Configuration change portion specifically for example has to change and is used for making the signal of video signal obtained from CCD and extensive area or the function of the information of zone association among a small circle.The region shape changing unit of following embodiment 9 also utilizes same function to realize particularly.Have again, realize this configuration change portion, it is also conceivable that multiple concrete grammar except utilizing the function that changes the information that is used for above-mentioned association, for example, utilize a kind of thing that is similar to on-off element, the signal of video signal of obtaining from CCD, only cut a part, realize same function etc. with this.

(embodiment 8 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 4, and its detailed description of Therefore, omited.

" configuration change portion " changes above-mentioned zone among a small circle or/and the configuration of extensive area.4 kinds of combinations are arranged, and they are: the also variable situation 2401 of regional among a small circle variable extensive area, fixedly extensive area is variable 2402, regional variable extensive area fixes 2403 among a small circle, zone and extensive area all fix 2404 among a small circle in the zone among a small circle.In addition, the situation that the zone fixedly also comprises when the zone is fixed in the photography zone among a small circle in the variable situation of extensive area and the relative position relation of extensive area is also fixed among a small circle.That is, follow the configuration change of extensive area, also change Qu Yu position among a small circle.In addition, the fixing situation 2406 of regional among a small circle variable extensive area also comprises zone and the fixing situation of the relative position relation of extensive area among a small circle.That is, comprise that also the position of following regional among a small circle configuration change extensive area also becomes the situation of configuration change.

At this moment, though the situation of following regional among a small circle configuration change extensive area to exceed the photography zone is arranged,, as the countermeasure that prevents that this from exceeding, can consider to carry out following processing as an example, for example, ignore under the situation that exceeds part, when exceeding, make extensive area from exceed partially retracted to the photography zone, perhaps, extensive area is exceeded, to photograph the zone as limits value, make its akinesia when above when being worth for this.In the present embodiment, also comprise the situation that it is handled as special case.

(simple declaration of the effect of embodiment 8) is according to present embodiment, even play under the situation of difficulty focusing by changing the effect that position regional among a small circle and extensive area also can focus on.

(embodiment 9) present embodiment is mainly based on embodiment 7 or embodiment 8, it is characterized in that also having change above-mentioned zone among a small circle or/and the size of extensive area or/and the region shape changing unit of aspect ratio.

(structure of embodiment 9) Figure 25 is about the concept map of the zone and the aspect ratio of extensive area among a small circle.

(one-piece construction) present embodiment is the imaging lens position control device with signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, it is characterized in that also having change above-mentioned zone 2502 among a small circle or/and the size of extensive area 2501 or/and the region shape changing unit of aspect ratio 2506.

(embodiment 9 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 4, and its detailed description of Therefore, omited." region shape changing unit " change above-mentioned zone among a small circle or/and the size of extensive area or/and aspect ratio.The parameter of zone and extensive area not only has the configuration of embodiment 8 among a small circle, and then also has size and these 2 parameters of aspect ratio in each scope zone.In the present embodiment, also comprise size and the aspect ratio situation of simple crosscorrelation mutually.For example, there is decision just can determine the situation of aspect ratio behind the area.In addition, in the time can freely changing among a small circle and on a large scale, exceed large-scale situation in addition among a small circle.In the present embodiment, also comprise for the generation of forbidding above-mentioned situation and make it not exceed large-scale situation limiting among a small circle.Certainly, present embodiment also comprises the situation that such restriction is not set and can freely determines regional among a small circle and extensive area.

(simple declaration of the effect of embodiment 9) played following effect according to present embodiment: even under the situation that the change position also is difficult to focus on as embodiment 8, can find the zone among a small circle that can focus on or/and the aspect ratio of extensive area or size.

(embodiment 10) present embodiment is characterized in that a plurality of above-mentioned zones among a small circle of configuration in an above-mentioned extensive area mainly based on a certain embodiment among the embodiment 4 to embodiment 6.

(structure of embodiment 10) Figure 26 is a plurality of concept maps in zone among a small circle of the interior configuration of the extensive area of present embodiment.

(one-piece construction) present embodiment is the imaging lens position control device with signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, it is characterized in that: a plurality of above-mentioned zones 2602～2609 among a small circle of configuration in above-mentioned extensive area 2601 or 2610.

(embodiment 10 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 4, and its detailed description of Therefore, omited.Configuration a plurality of " zones among a small circle " in an extensive area of present embodiment.When configuration a plurality of whens zone among a small circle, each aspect ratio and size among a small circle can freely dispose.Present embodiment also comprises the regular correct zone among a small circle that the configuration shape is identical.Embodiment 10 can be the mode different with embodiment 9.

(simple declaration of the effect of embodiment 10) according to present embodiment, by selecting to want to focus among a small circle among a small circle a plurality of, can select among a small circle in the photographic lens position of decision focusing.In addition, in the present embodiment, can be in being configured in extensive area a plurality of among a small circle so that select among a small circle a plurality of, and it is defined among a small circle again as one, to this condenser lens of calculating among a small circle position that redefines, by 4 same processing decide the photographic lens position with embodiment.

(embodiment 11) present embodiment is characterized in that a plurality of above-mentioned extensive area of configuration in the photography zone of embodiment 10 mainly based on embodiment 10.

(structure of embodiment 11) Figure 27 is the concept map of the shape of a plurality of extensive area of disposing in the photography zone of present embodiment of expression one example.

(one-piece construction) present embodiment is the imaging lens position control device with signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, it is characterized in that a plurality of above-mentioned extensive area of configuration in the photography zone.

(embodiment 11 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 4, and its detailed description of Therefore, omited.Configuration a plurality of " extensive area " in the photography zone of present embodiment.Dispose a plurality of extensive area and be meant that preparation is on a large scale various.Its shape can comprise various shapes as shown in figure 27.Can comprise extensive area 2704 of the big extensive area of aspect ratio 2701, extensive area 2702, oval-shaped extensive area 2703 and star that aspect ratio is little etc.In addition, also comprise it being the extensive area 2705 that does not have the toroidal of middle body on a large scale.In addition, also comprise the extensive area that is divided into 2 zones.In addition, also comprise 2 region overlappings and can carry out the extensive area 2706 of double integral to overlapping part.In addition, present embodiment comprises that also the zone is not the situation of the part in the extensive area among a small circle.At this moment, a part that also comprises among a small circle the zone is with extensive area is overlapping, whole not situations within extensive area in zone among a small circle.

(simple declaration of the effect of embodiment 11) played and can freely be selected extensive area and then increase the variation that focuses on and the effect that focuses on easily according to present embodiment.

(embodiment 12) present embodiment is a kind of imaging lens position control device, have and comprise above-mentioned zone among a small circle and be included in medium range zone within the above-mentioned extensive area, the signal of video signal of above-mentioned obtaining section, high frequency signal of video signal extraction unit, integrated signal generating unit and above-mentioned zone among a small circle and extensive area is similarly handled the signal of video signal in above-mentioned medium range zone, and above-mentioned photography condenser lens determining positions portion is regional according to zone among a small circle, medium range, the priority of the decision of the order decision photographic lens position of extensive area.

(structure of embodiment 12) Figure 28 is the functional-block diagram of present embodiment, and Figure 29 is the concept map in medium range zone.

(one-piece construction) present embodiment is to have " signal of video signal obtaining section " (2802), " contrast information obtaining section " (2803), " imaging lens position control device " (2801) of " peak focus lens position information obtaining section " (2804) and " photographic lens determining positions portion " (2805), it is characterized in that having medium range zone 2902, above-mentioned obtaining section, high frequency signal of video signal extraction unit, integrated signal generating unit and above-mentioned zone 2903 among a small circle and the signal of video signal of extensive area 2901 are similarly handled the signal of video signal in above-mentioned medium range zone 2902, and above-mentioned photography condenser lens determining positions portion 2805 is according to zone 1103 among a small circle, medium range zone 1102, the priority of the decision of the order decision photographic lens position of extensive area 1101.

(embodiment 12 structure explanation) about signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, because of identical with the basic function of embodiment 4, and its detailed description of Therefore, omited.

" medium range zone " comprises above-mentioned zone among a small circle and is included within the above-mentioned extensive area.In this medium range zone, above-mentioned obtaining section, high frequency signal of video signal extraction unit, integrated signal the generating unit also signal of video signal with above-mentioned zone among a small circle and extensive area are the same, handle the signal of video signal in above-mentioned medium range zone.Photographic lens determining positions portion is according to zone, medium range order regional, extensive area determine the priority of the decision of photographic lens position among a small circle.Medium range zone in the present embodiment also can be defined as the situation that is limited to embodiment 8.By 3 grades of focusing, when when the condenser lens position can not be calculated in the zone among a small circle, just calculate the condenser lens position in the medium range zone, can obtain more information like this, can realize reliable focusing thus.In addition, the same about the configuration of the size of scope in this, middle scope and the shape of middle scope with embodiment 11, can comprise various modes.

(simple declaration of the effect of embodiment 12) plays following effect according to present embodiment: by redetermination medium range zone, when not focusing in zone among a small circle etc. under the situation, can use this medium range zone auxiliaryly, therefore, focus on easily.

(embodiment 13) present embodiment is mainly based on embodiment 12, it is characterized in that above-mentioned medium range zone and then formed by a plurality of medium range zone with relation of inclusion.

(structure of embodiment 13) Figure 30 is the concept map in a plurality of medium range zone.

(one-piece construction) present embodiment is a kind of imaging lens position control device, have: the signal of video signal obtaining section, the contrast information obtaining section, peak focus lens position information obtaining section and photographic lens determining positions portion, above-mentioned medium range zone also has by a plurality of kinds of medium range zones that the scope zone forms with relation of inclusion, above-mentioned obtaining section, high frequency signal of video signal extraction unit, the signal of video signal of integrated signal generating unit and above-mentioned zone among a small circle and extensive area is similarly handled the signal of video signal in above-mentioned medium range zone, and above-mentioned photographic lens determining positions portion is according to zone among a small circle, the medium range zone, the priority of the decision of the order decision photographic lens position of extensive area.It is characterized in that: above-mentioned medium range zone 3002 is as an example, and then formed by a plurality of medium range zone 3003,3004,3005,3006 with relation of inclusion.

(the structure explanation of embodiment 13) similarly handles signal of video signal, the photographic lens determining positions portion in above-mentioned medium range zone about the signal of video signal of signal of video signal obtaining section, contrast information obtaining section, peak focus lens position information obtaining section, photography condenser lens determining positions portion, medium range zone, above-mentioned obtaining section and high frequency signal of video signal extraction unit and integrated signal generating unit and above-mentioned zone among a small circle and extensive area, all the basic function with embodiment 4, embodiment 5, embodiment 10 is identical because of them, its detailed description of Therefore, omited." the medium range zone " of present embodiment formed by a plurality of medium range zone with relation of inclusion.A plurality of medium range have relation of inclusion and for example are meant the medium range that exists a plurality of conducts a part of on a large scale, this medium range also has the medium range of a conduct part wherein, and then, the part of this medium range has medium range again, comprises among a small circle in the part of n medium range.

(simple declaration of the effect of embodiment 13) can remove the effect that denoising obtains the focusing structure of the uniqueness of sequential focusing on scenery thereby just played by a plurality of medium range are set like this.

More than, the 2nd imaging lens position control device has been described.

Claims (11)

1. imaging lens position control device is characterized in that having:

The signal of video signal obtaining section obtains signal of video signal the extensive area in the zone of photographing and the zone among a small circle as the part of extensive area explicitly with the condenser lens position;

The contrast information obtaining section obtains the contrast information that the information of contrast is represented in conduct explicitly with above-mentioned condenser lens position from above-mentioned signal of video signal;

Peak focus lens position information obtaining section obtains peak focus lens position information, and wherein this peak focus lens position information is the condenser lens position of peak value is represented in expression by above-mentioned contrast information contrast information; And

Photography condenser lens determining positions portion, the condenser lens position that decision is suitable for photographing,

Above-mentioned photography condenser lens determining positions portion obtains under the situation of peak focus lens position information in above-mentioned zone among a small circle, decide photography condenser lens position according to this peak focus lens position information, do not obtain under the situation of peak focus lens position information in above-mentioned zone among a small circle, decide photography condenser lens position according to the peak focus lens position information of above-mentioned extensive area.

2. the imaging lens position control device of claim 1 record is characterized in that signal of video signal is a luminance signal.

3. the imaging lens position control device of claim 1 record is characterized in that signal of video signal is the wantonly combination more than 1 or 2 of rgb signal.

4. the imaging lens position control device of claim 1 record is characterized in that signal of video signal is the wantonly combination more than 1 or 2 of CMYG signal.

5. the imaging lens position control device of each record in the claim 1 to 4 is characterized in that, above-mentioned area configurations among a small circle is at the central part of above-mentioned extensive area.

6. the imaging lens position control device of each record in the claim 1 to 4 is characterized in that, also has the above-mentioned zone among a small circle of change or/and the configuration change portion of the configuration of extensive area.

7. the imaging lens position control device of claim 5 record is characterized in that, have the above-mentioned zone among a small circle of change or/and the size of extensive area or/and the region shape changing unit of aspect ratio.

8. the imaging lens position control device of each record in the claim 1 to 4 is characterized in that, a plurality of above-mentioned zones among a small circle of configuration in an above-mentioned extensive area.

9. the imaging lens position control device of claim 8 record is characterized in that, a plurality of above-mentioned extensive area of configuration in the photography zone.

10. imaging lens position control device is characterized in that having:

The signal of video signal obtaining section, with the condenser lens position explicitly the extensive area in the zone of photographing, as the zone among a small circle of the part of extensive area and comprise above-mentioned zone among a small circle and be included in the medium range zone the above-mentioned extensive area, obtain signal of video signal;

The contrast information obtaining section obtains the contrast information that the information of contrast is represented in conduct explicitly with above-mentioned condenser lens position from above-mentioned signal of video signal;

Peak focus lens position information obtaining section obtains peak focus lens position information, and wherein this peak focus lens position information is the condenser lens position of peak value is represented in expression by above-mentioned contrast information contrast information; And

Photography condenser lens determining positions portion, the condenser lens position that decision is suitable for photographing,

Above-mentioned photography condenser lens determining positions portion obtains under the situation of peak focus lens position information in above-mentioned zone among a small circle, decide photography condenser lens position according to this peak focus lens position information, do not obtain peak focus lens position information and obtain under the situation of peak focus lens position information in above-mentioned zone among a small circle in above-mentioned medium range zone, peak focus lens position information according to above-mentioned medium range zone decides photography condenser lens position, do not obtain under the situation of peak focus lens position information in above-mentioned zone among a small circle and medium range zone, decide the condenser lens position of photographing according to the peak focus lens position information of above-mentioned extensive area.

11. the imaging lens position control device of claim 10 record is characterized in that, above-mentioned medium range zone and then be made of a plurality of medium range zone with relation of inclusion.

Images