CN1311288C - Focusing device, camera and focusing position checking method - Google Patents
Focusing device, camera and focusing position checking method Download PDFInfo
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- CN1311288C CN1311288C CNB031243436A CN03124343A CN1311288C CN 1311288 C CN1311288 C CN 1311288C CN B031243436 A CNB031243436 A CN B031243436A CN 03124343 A CN03124343 A CN 03124343A CN 1311288 C CN1311288 C CN 1311288C
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Abstract
The invention discloses a focusing device, camera and focusing position checking method to make adjustable the focus to a subject at an infinite-distance with high precision. An AF part 10 of an electronic camera is equipped with two filter means for normal position detection and infinite-distance position detection in which more high-frequency components than those of the normal position detection are passed. When an infinite-distance detection button is pressed, movement of a focusing lens 3 by an amount of movement smaller than the amount of movement of AF processing of normal photographic processing and imaging are repeated within a focus position proximity range corresponding to an infinite distance, the filter means for the infinite-distance position detection performs filter processing for an imaging signal obtained by the imaging, and focus detection is carried out on the basis of the contrast value of the obtained imaging signal to solve the above problem.
Description
Technical field
The present invention relates to best focusing mechanism, camera (comprising video camera) and the focusing position detection method of being carried out the focus adjustment by photo-object to infinity.
Background technology
In camera,, AF (focusing automatically) is arranged as the focus adjusting mechanism of general use.In this AF, variety of ways such as active mode, passive mode, contrast mode are arranged.For example, in digital camera, generally adopt the AF of contrast mode.In the AF of this contrast mode, owing to utilize image pickup signal, so having does not have parallax and need not to be provided with special big advantages such as AF sensor.
On the other hand, in the AF of this contrast formula, also have so-called focus adjust difficulty by the shortcoming of photo-object.For example, by photo-object be the situations such as celestial body at night.The celestial body at night, because its brightness significantly reduces, its contrast is totally very low, so, not observing peak value, it is very difficult that the focus adjustment becomes.In addition, because the celestial body at night is offset when becoming fuzzy state slightly in the focal position,, detect false focusing position so the phenomenon that has contrast to uprise can produce contrast than the more close position at one's side of real focusing position.
On the other hand, even in the camera that has MF (manual focus) as single-lens reflex camera, the occasion of the celestial body at night on by photo-object, because it is low by the brightness of photo-object, so, utilize this MF neither be easily with being focused on the visual focusing ground glass surface by photo-object.
The content of invention
Problem of the present invention is, In view of the foregoing, provide a kind of can be to infinity carried out focusing mechanism, camera that focus accurately adjusts and the detection method that detects focusing position by photo-object.
The invention provides a kind of focusing mechanism,, it is characterized by having the filtering mechanism that image pickup signal carried out frequency filtering and handle, detecting in the focusing mechanism of focusing position based on the contrast value of utilizing this filtering mechanism to carry out the image pickup signal that frequency filtering handles,
Aforementioned filtering mechanism comprises: the first filtering mechanism that uses of position probing usually; That the infinity position probing is used, with respect to the second different filtering mechanism of the aforementioned first filtering mechanism frequency characteristic; Select the selection mechanism of aforementioned first filtering mechanism or the aforementioned second filtering mechanism as the mechanism that carries out aforementioned frequency filtering processing,
The aforementioned second filtering mechanism has the characteristic that the radio-frequency component of more image pickup signal is passed through with respect to the aforementioned first filtering mechanism.
The invention provides a kind of camera, it is characterized by, it is equipped with described focusing mechanism, as the focusing position adjustment of shooting optical facilities.
The invention provides a kind of focusing mechanism,, it is characterized by having the filtering mechanism that image pickup signal carried out frequency filtering and handle, detecting in the focusing mechanism of focusing position based on the contrast value of utilizing this filtering mechanism to carry out the image pickup signal of overfrequency Filtering Processing,
Aforementioned filtering mechanism comprises: the first filtering mechanism that uses of position probing usually; Ad-hoc location detect usefulness, with respect to the second different filtering mechanism of the frequency characteristic of the aforementioned first filtering mechanism; Select the selection mechanism of aforementioned first filtering mechanism or the aforementioned second filtering mechanism as the mechanism that carries out aforementioned frequency filtering processing,
The aforementioned second filtering mechanism is with respect to the aforementioned first filtering mechanism, the radio-frequency component of image pickup signal pass through the characteristic difference.
The invention provides a kind of focusing position detection method, image pickup signal is being carried out the frequency filtering processing, contrast value based on the image pickup signal that carried out this frequency filtering processing, and detect in the focusing position detection method of focusing position, it is characterized by, handle as frequency filtering, the first frequency Filtering Processing of selecting common position probing to use, perhaps use as the infinity position probing, the second frequency Filtering Processing that the radio-frequency component of more image pickup signal is passed through with respect to aforementioned first frequency Filtering Processing, image pickup signal being carried out the frequency filtering of aforementioned selection handles, the contrast value of the image pickup signal of handling based on this frequency filtering that carried out detects focusing position.
According to said structure, detect to infinity by the focusing position of photo-object the time, the second filtering mechanism that utilizes the infinity position probing to use carries out frequency filtering and handles, and can detect focusing position.Whereby, can be to infinity carried out high-precision focus adjustment by photo-object.In addition, what is called is carried out the frequency filtering processing to image pickup signal, is meant that the characteristic frequency composition to image pickup signal carries out Filtering Processing.
According to this structure, carry out frequency filtering by the second filtering mechanism that utilizes the infinity position probing to use and handle, with respect to the first filtering mechanism, there is the radio-frequency component of more image pickup signal to pass through.Usually, the spatial frequency of the image of being made a video recording, since far away more more little with respect to the relative size of the size of camera watch region by the distance of photo-object by photo-object, so radio-frequency component is many.Thereby, when being positioned at that infinity is this to be detected by photo-object mechanics focusing at a distance, the radio-frequency component of image to shooting detects more favourable, handle by utilizing the aforementioned second filtering mechanism to carry out frequency filtering, can be to infinity carried out high-precision focus adjustment by photo-object.
According to said structure, when the indication that detects the infinity position was arranged, for the scope that comprises aforementioned infinity position of anticipation, the mobile ratio of focal position carried out with thinner interval usually, carries out the detection of focusing position.Usually, by far away more by the distance of photo-object, the radio-frequency component of the spatial frequency of the image of being made a video recording is many more, so far away more by the distance of photo-object, contrast is remarkable more with respect to the variation of the amount of movement of focal position.Thereby, focused when detecting by photo-object at a distance for infinity etc. is this, by carrying out moving of focal position than thinner location interval usually, can be to infinity carried out high-precision focus adjustment by photo-object.
According to said structure, when the indication that detects the infinity position is arranged, repeated multiple times carries out based on the contrast value by the described image pickup signal of repeatedly obtaining repeatedly, detecting focusing position for moving of the scope that comprises the infinity position of anticipation and obtaining of image pickup signal.Whereby, can be to infinity carried out focus adjustment accurately by photo-object.
According to this mechanism, final to coke number from temporarily coke number is detected repeatedly.Whereby, can be to infinity carried out high-precision focus adjustment by photo-object.
According to said structure, can realize the camera that can be carried out the adjustment of high precision focus by photo-object to infinity.
According to this structure, when the adjustment of infinity position is carried out in indication, carry out the adjustment of infinity position based on the focusing position value of the infinity of being stored.Whereby, can be to infinity carried out high-precision focus adjustment by photo-object.
According to this structure, with the focal length in this moment and infinity position coke number is stored together.Whereby, in the camera that has the zoom optical facilities, can be to infinity carried out high-precision focus adjustment by photo-object.
According to said method, can obtain and aforementioned first kind of identic effect.
According to said method, can obtain and aforementioned the third identic effect.
According to said method, can obtain and aforementioned the 4th kind of identic effect.
The simple declaration of accompanying drawing
Fig. 1 is the structure example according to the Electrofax of a kind of form of implementation of the present invention.
Fig. 2 (a) is the diagram of the frequency characteristic of the filtering mechanism that uses of the common position probing of expression, (b) is the diagram of the frequency characteristic of the filtering mechanism that uses of expression infinity position probing.
Fig. 3 is the process flow diagram that is illustrated in an example of the focusing position detection processing when pressing the infinity test button.
Fig. 4 presses after the infinity movable button, the process flow diagram of an example of the photograph processing when pressing button release.
Fig. 5 (a) and (b) are process flow diagrams of an example of the common photograph processing of expression.
The working of an invention form
Below, with reference to description of drawings form of implementation of the present invention.
Fig. 1 is the structure example according to the Electrofax of a kind of form of implementation of the present invention.
In the figure, photographic lens portion 1 comprises as the zoom of zoom optical facilities lens 2 and focusing lens 3 etc., will be imaged on the imaging apparatus 4 by photo-object.In addition, photographic lens portion 1 for infinity by photo-object, the focusing position that focuses on lens 3 changes according to focal length.
Imaging apparatus 4 for example is CCD (Charge Coupled Device: charge-coupled image sensor), the effect that utilizes photographic lens portion 1 is imaged on carried out light-to-current inversion by resembling of photo-object on the imaging apparatus 4, the analog electrical signal of output performance image.
Image pickup part 5 comprises CDS (the Correlated Double Sampling: the correlated double sampling) AGC of adjustment signal level (Automatic Gain Control: automatic gain control) that reduces the noise composition, and electric analoging signal is transformed into A/D of digital electric signal etc., in the time of with the noise composition that reduces from the analog electrical signal of imaging apparatus 4 outputs, adjust signal level, it is transformed into digital signal output.
In addition, image pickup part 5, DRAM6, image treatment part 7, compression extension 8, LCD display part 9, AF portion 10, CPU11 all is connected on the bus 12, can carry out the exchange of data mutually.
DRAM (Dynamic Random Access Memory: dynamic RAM) 6, being used for will be as the pictorial data of the digital electric signal of exporting from image pickup part 5 and by temporary transient preserve such as pictorial data of image treatment part 7 in the processing of various image processings, perhaps as carrying out the uses such as perform region that control and treatment is used by CPU11.
Image treatment part 7, carry out following various processing, that is, the γ that carries out when imagery data recording proofreaies and correct, carry out various treatment for correcting such as white balance correction and make the number of picture elements increase and decrease that constitutes image zooming, dwindle processing (resizing processing) etc.
Compression extension 8, (JointPhotographic Experts Group: associating figure expert group) mode is carried out compression, the expansion of pictorial data to utilize the record of pictorial data, the JPEG of regeneration usefulness.
Storage card 13 be can dismounting on this Electrofax recording medium, the pictorial data of the image that the recorded and stored performance is photographed with this Electrofax etc.In addition, do not illustrate among the figure, this storage card 13 is connected on the compression extension 8 via card I/F.
LCD display 9 shows with the photographed image of pictorial data performance and various menus etc.
In addition, do not illustrate among the figure, this LCD display 9 is connected on the bus 12 via lcd driver.
AF portion 10, from image pickup signal, extract the image pickup signal in the part zone of picture based on the output signal of imaging apparatus 4, the spatial frequency of the image pickup signal that extracted is carried out frequency filtering handle, detect focusing position based on the contrast value of carrying out the image pickup signal that this frequency filtering handles.But, AF portion 10 is as carrying out the mechanism that frequency filtering is handled, have corresponding to by the distance of photo-object being common position (the filtering mechanism that uses of the common position probing of 1m～10m) for example, and corresponding to being infinity position probing filtering mechanism by the distance of photo-object, when carrying out the frequency filtering processing, select one of them mechanism, utilize selected filtering mechanism to carry out aforementioned frequency filtering and handle.In addition, infinity detects and uses filtering mechanism, has the frequency characteristic that the filtering mechanism that common position probing is used passes through the more radio-frequency component of image pickup signal.
CPU11 is a central processing department, is stored in camera program in the flash memory 14 by execution, controls whole actions of this digital camera.For example, focus on drive controlling according to the focusing position that utilizes aforementioned AF portion 10 to obtain, and carry out pressing according to the zoom button of describing later to the drive controlling of zoom with lens 2 with lens 3.
Flash memory 14 be a kind of can non-volatile storer when carrying out electric rewrite action, except that the camera program of storage by the CPU11 execution, also store the various data of using by in this camera program implementation process, for example, by foregoing AF portion 10 obtain corresponding to infinity by focusing position of photo-object (the infinity position data among this figure) etc.
CD-ROM drive motor/loop portion 15, according to the pulse value from CPU11 output, the CD-ROM drive motor rotation that zoom is used drives zoom lens 2.
CD-ROM drive motor/loop portion 16 according to the pulse value from CPU11 output, makes the CD-ROM drive motor rotation that focuses on usefulness, drives to focus on lens 3.
In addition, zoom is used CD-ROM drive motor with CD-ROM drive motor and focusing, for example, is step motor.
Operating mechanism 17, be the various indications that acceptance is sent from the cameraman, it is notified to the various buttons that CPU11 uses, for example, the release-push that can photograph and prepare indication and photograph and begin to indicate, can detect indication infinity test button to the focusing position by photo-object of infinity, can focus on the infinity movable button of the indication of moving to focusing position by photo-object corresponding to infinity with lens 3, can carry out the zoom button etc. of the setting of zoom ratio (looking in the distance wide-angle).
Then, aforesaid common position probing is described with frequency characteristic different of infinity position probing with filtering mechanism with filtering mechanism.
Fig. 2 (a) expression is the diagram of the frequency characteristic of the filtering mechanism that uses of common position probing, and this figure (b) is the diagram of expression infinity position probing with the frequency characteristic of filtering mechanism.In addition, in these figure (a) and (b), the longitudinal axis is the signal level with 0～255 quantized image pickup signal of representing, transverse axis representation space frequency f.In addition, dotted line is represented the spatial frequency distribution of the image pickup signal before the Filtering Processing, and solid line is represented the spatial frequency distribution of the image pickup signal after the Filtering Processing.
Shown in this figure (a), the filtering mechanism that common position probing is used has low-frequency component and radio-frequency component deletion with image pickup signal, extracts the frequency characteristic of frequency content in addition.
On the other hand, shown in this figure (b), infinity position probing filtering mechanism has the frequency characteristic that the radio-frequency component of more image pickup signal is passed through with respect to common position probing, that is the frequency characteristic that, has the radio-frequency component that only extracts image pickup signal.Because far away more by photo-object, the figure by photo-object on the picture becomes thin more, so in the position of infinity, it is big that the radio-frequency component of the spatial frequency of the image of photography becomes.Thereby, for this occasions of being focused by photo-object at a distance such as infinities, it is favourable that the radio-frequency component of figure image of shooting is focused, in this case, handle by utilizing the infinity position probing to carry out frequency filtering with filtering mechanism, can be to infinity carried out high-precision focus adjustment by photo-object.
Secondly, the control and treatment that the CPU11 that utilizes above-mentioned digital camera is carried out describes.In addition, this control and treatment is read the camera program that is stored in the flash memory 14 by CPU11 and is realized.
At first, for carry out as one of this control and treatment press the infinity test button time focusing position detect to handle and to describe.This processing detect for the infinity at the focal length place of regulation by the focusing position of photo-object, be a kind of processing of storing the focal length in this focusing position and this moment.
Fig. 3 is the process flow diagram that the focusing position of expression when pressing the infinity test button detects an example of handling.
In the figure, at first,, press the infinity button, carry out being indicated infinity by the detection of the focusing position of photo-object at S301.
At S302, with the value N zero setting of counter.
In addition, the value N of counter whenever calculates the described interim value that coke number (temporarily to coke number) is increased progressively in back.
At S303, comprise corresponding to infinity by near the position of the starting end of the scope (scope that comprise infinity position of anticipation) of the focal position of photo-object this interior focal position, move to focus on lens 3.In addition, below, will comprise corresponding to this infinity by near the scope of the focal position of photo-object this interior focal position, be called simply corresponding to infinity by near the scope of the focal position of photo-object.
At S304, carry out the shooting processing that AF handles usefulness.That is, the picture by photo-object that is imaged on the imaging apparatus 4 is made a video recording, obtain corresponding to by the analog electrical signal of photo-object.But, because being AF, this step handles with the shooting processing, so, remove center section processing etc., reduce the data volume of analog electrical signal.
At S305, the analog electrical signal that previous step is obtained carries out the A/D conversion process, obtains the image pickup signal as digital electric signal.
At step S306, from the image pickup signal that previous step obtains, extract the image pickup signal in the scope of setting as the AF zone.
At S307, as carrying out the mechanism that frequency filtering is handled, the filtering mechanism of selecting the infinity position probing to use utilizes this filtering mechanism that the image pickup signal that extracts in previous step is carried out frequency filtering and handles, and extracts the radio-frequency component of image pickup signal.
At S308, will in previous step, carry out brightness value (contrast value) integration of each pixel of the image pickup signal that frequency filtering handles, calculate this integrated value as evaluation of estimate.
At S309, use the location storage of lens 3 in DRAM6 the evaluation of estimate and the focusing in this moment that previous step calculates.
At S310, the focusing of judging this moment with the position of lens 3 whether be corresponding to infinity by near the terminal location of the scope the focal position of photo-object, when judged result is the occasion of Yes, enter the processing of S312, in the occasion of No, enter the processing of S311.
At S311, move the location interval amount that goes on foot corresponding to focusing on lens 3.But the location interval corresponding to a step is in this step set carefullyyer than the location interval amount of describing later corresponding to the step during the AF of photograph processing handles usually.Thereby,,, can carry out focus adjustment more accurately by to focus on amount of movement than common thinner location interval with lens 3 in the occasion of being focused by photo-object and detecting to infinity.
Then, when the processing of S311 finishes, turn back to the processing of S304, carry out aforementioned processing repeatedly.
Whereby, from corresponding to infinity by near the starting end position of the scope the focal position of photo-object to terminal location, calculate to focus on and whenever move the evaluation of estimate that moves a step, and stored with lens 3.
At S312, from the evaluation of estimate of such storage, obtain maximum evaluation of estimate, read focusing when obtaining this maximum evaluation of estimate among the DRAM6 with the position of lens 3, with this position as interim coke number is stored among the DRAM6.
At S313, the value N of counter is increased progressively.
At S314, judge whether the value N of counter is 3, when judged result is Yes, enter the processing of S315, during for No, return the processing of S303, and repeat aforementioned processing.Whereby, in DRAM6, store 3 temporarily to coke number.
At S315, from 3 interim mean values being stored, calculate final to coke number (finally to coke number) to coke number.Whereby, can obtain more high-precision to coke number.Then, the focal length corresponding to the zoom lens position to coke number and this moment that this is final is stored in the flash memory 14 together, and this flow process finishes.
Detect processing by carrying out above focusing position, focal length place when the infinity button is pressed in acquisition to infinity by the focusing position of photo-object (final focusing position), the focal length in this focusing position and this moment is stored in the flash memory 14 together.
Thereby, for example, with camera point to suitable infinity by photo-object (for example mountain and buildings etc. in picture, have enough big area by photo-object), the cameraman presses zoom button, move zoom with after the lens 32 with the field angle of wanting to take, by pressing the infinity test button, can be with coke number and this focal length be stored in the flash memory 14 to infinity by photo-object at this focal length place constantly.In addition, for example, corresponding to as the infinity in the design such as infinity index by the focal position of photo-object, even under situation about being offset along with the variation of time, detect and use button by pressing aforementioned infinity, always can obtain correct corresponding to infinity by the focal position of photo-object.
Detect in the processing at aforementioned focusing position, will be from once being moved to the mobile conduct of terminal location corresponding to infinity by the starting end position of the focal position environs of photo-object, this moving carried out 3 times repeatedly, obtain its each time temporarily to coke number, from amounting to 3 times final to coke number to calculating coke number average, but this mobile multiplicity is not limited to 3 times.In addition,, also be not limited to calculate each time temporarily to coke number, for example, also can be every calculating several times once temporarily to coke number, from a plurality of final to obtaining the coke number temporarily to coke number.
Secondly, to as utilize the CPU11 control and treatment one of, photograph processing when pressing button release after pressing the infinity movable button describes.This processing be based on be stored in the aforementioned flash memory 14 to infinity by photo-object focusing position and focal length, to the processing of being photographed of infinity by photo-object.
Fig. 4 is a process flow diagram of pressing an example of the photograph processing when pressing button release behind this infinity movable button.
In the figure, at first,, press the infinity movable button at S401, become focus on lens 3 grades to corresponding to infinity by the mobile indication of the position of photo-object.
At S402, read out in be stored in the processing of aforementioned S315 in the flash memory 14 to coke number and focal length.
At S403, based on read in previous step to coke number and focal length, move to focus on lens 3 and zoom with lens 2.That is,, zoom lens 2 are moved to the position corresponding to this focal length focusing on lens 3 to moving corresponding to this position to coke number.
At S404, interior button release is pressed 1st (first) off-position, and judge whether to become photography and prepare indication, when the result of this judgement is Yes, the processing that enters S405, the occasion at No repeats this processing.
At S405, carry out AE and handle (automatic exposure) processing.In this AE handles, carry out and will be made a video recording by photo-object, according to the image pickup signal that this shooting obtained, measure by the brightness of photo-object, obtain appropriate exposure according to this measured value, wait processing.In addition, can carry out by the brightness measuring of photo-object with sensor specials such as photometry sensors.
At S406, release-push is pressed 2nd (second) off-position, judge that release becoming photography and beginning indication, when the result who judges is Yes, the processing that enters S407, the occasion at No repeats this processing.
At S407, photography conditions such as the aperture of the appropriate exposure that utilization is obtained in handling according to the AE at aforementioned S405 and shutter speed carry out actual photograph processing.Promptly, utilize this photography conditions, with be imaged on the imaging apparatus 4 the picture by photo-object make a video recording, utilize the processing such as A/D conversion of image pickup part 5, utilize the various image processings of image treatment part 7, and utilize compression processing that compression extension 8 carries out etc., obtain the pictorial data of the form on the storage card 13 that is recorded in.
At S408, the imagery data recording that previous step is obtained arrives storage card 13, and this flow process finishes.
By carrying out above photograph processing, based on detect by aforementioned focusing position handle be stored in the flash memory 14 to coke number and focal length, the subject of the infinity that is in this focal length place is photographed.
Whereby, the cameraman presses infinity in advance and detects button, by storage to infinity by photo-object to coke number and this focal length constantly, then, under the situation of being photographed, move button as long as press infinity by photo-object to the infinity that is in this focal length place, zoom is moved to the position corresponding to this focal length with lens 2, and, make to focus on lens 3 to moving corresponding to this position to coke number, just can carry out focus adjustment accurately.
For example, the celestial body at night is carried out with the focal length of regulation correct focusing etc. under the situation, by day, to be in the distance very far away that is counted as infinity by photo-object, press zoom button and set its focal length, press infinity and detect button, storage with respect to the infinity that is in this focal length place by photo-object to coke number and focal length thereof, press infinity at night and move button and get final product.Whereby, to the celestial body at night, can carry out high-precision focus adjustment.
In addition, in the processing of aforementioned S403, zoom with lens 3 automatically to moving corresponding to the position that is stored in the flash memory 14, but, for example, also can be provided with on Electrofax and can indicate zoom lens 2 to the focal length indicating mechanism that moves corresponding to the position of this focal length, the cameraman presses zoom button according to this indication, makes zoom manually move to position corresponding to this focal length with lens 3.In addition, mechanism is used in focal length indication, for example, can carry out this indication with lighting of LED etc.
In addition, in this photograph processing, when pressing the infinity movable button, according to be stored in the flash memory 14 to coke number and focal length, focus on lens 3 and zoom with lens 2 just the samely the infinity at the focal length place when pressing corresponding to aforementioned infinity detection button moved by the position of photo-object, but the infinity that also can the focal length when pressing with the infinity test button be in different focal length places is carried out the focus adjustment by photo-object.
In this case, for example, in aforementioned photograph processing, when pressing infinity and move button, distance when wanting to photograph and be stored in the flash memory 14 to coke number and focal length, by calculating, calculate to the infinity that is in the focal length place when wanting to carry out this photography by photo-object to coke number, focusing is moved to corresponding to this position to coke number with lens 3.
In addition, in this form of implementation, aforementioned focusing position detection processing and aforementioned photograph processing are illustrated as individual processing, but also two processing can be carried out continuously.That is, after finishing, S315 then carries out the later processing of S402.
Secondly, the common photograph processing as one of control and treatment of being undertaken by CPU11 is described.
Fig. 5 (a) (b), is the process flow diagram of an example of the common photograph processing of expression.
In this figure (a), in the processing of S501 to S502, carry out the processing identical with aforementioned S404 to S405.
In S503, carry out the described AF in back and handle, detect focusing position, focus on and be moved to focusing position with lens 3.
In the processing of S504 to S506, carry out the processing same with the processing of aforementioned S406 to S408, this flow process finishes.
Below, illustrate that with this figure (b) AF of aforementioned S503 handles.
In this figure (b), the processing identical with the processing of aforementioned S304 to S306 carried out in the processing of S511 to S513.
At S514, as carrying out the mechanism that frequency filtering is handled, select common position probing filtering mechanism, utilize this filtering mechanism, the image pickup signal that previous step is obtained carries out the frequency filtering processing, removes the low frequency composition and the radio-frequency component of image pickup signal.
In the processing of S515 to S516, carry out the processing identical with the processing of aforementioned S308 to S309.
At S517, with previous step rapid in the evaluation of estimate and the preceding once evaluation of estimate of storage of storage compare, judge whether to produce and exceed the poor of certain value, when judged result is Yes, enters S518 and handle, during for No, enter the processing of S519.In addition, in this judgment processing,, be judged as contrast peak value (コ Application ト ラ ス ト ピ one Network), the detection focusing position when two evaluations of estimate produce when exceeding certain value poor.
At S518, will focus on lens 3 and move to the position that obtains contrast (contrast) peak value, this flow process finishes.
At S519, judge to focus on and use lens 3 whether at this terminal location that focuses on the moving range of using lens 3, when this judged result is Yes, enter the processing of S520, when being No, enter the processing of S521.
At S520, carry out error and show.For example, on LCD display 9, so will be owing to not seeing that the contrast peak value does not detect the content of focusing position etc., shows as error.
At S521, move focusing with lens 3 with amount corresponding to a common location interval that goes on foot, turn back to S511, repeat aforesaid processing.
Whereby, be judged as the contrast peak value, perhaps focused on and move to the aforementioned terminals position, repeated to make a video recording and focus on moving with lens 3 with lens 3.
By carrying out above common photograph processing, in its AF handles, the filtering mechanism of selecting common position probing to use, utilizing selected filtering mechanism that image pickup signal is carried out frequency filtering handles, contrast value based on the image pickup signal that carried out this frequency filtering processing, carry out the detection of focusing position, photograph.
In addition, during the AF in this common photograph processing handles,, one side simultaneously handles because detecting the contrast peak value, so, corresponding to the common location interval in an aforementioned step,, set the amount of movement of suitable focusing for lens 3 from shortening the viewpoint of AF processing time and raising AF precision.
In addition, in this above-mentioned form of implementation, when dispatching from the factory, detect in advance to the infinity at the focal length place that can set easily cameramans such as wide-angle side or telescope ends by photo-object to coke number, and it is stored in the flash memory 14, then, press zoom button by the cameraman, when under the state that zoom is placed wide-angle side or telescope end with lens 2, pressing the infinity movable button, read correspondingly from flash memory 14, can move to corresponding to this position with lens 3 focusing on to coke number to coke number.
In addition, in this form of implementation, even also the optical texture of photographic lens portion 1 can be made since zoom with lens with respect to infinity moved the variation that causes focal length by photo-object, focus on the also indeclinable structure of focusing position of usefulness lens 3.But, in this case, in flash memory 14, do not store focal length, only storage is to coke number.In addition, in the structure of photographic lens portion 1 for not being equipped with under the situation of zoom with the single-focusing structure of lens 3, similarly, also only storage to coke number.
In addition, in this form of implementation,,,, also can adopt micro-stepping drive controlling mode as its drive controlling mode in order to make its drive controlling angle thinner utilizing step motor as focusing on under the situation of CD-ROM drive motor.
In addition, Electrofax according to this form of implementation, also be that a kind of having carried out the filtering mechanism that frequency filtering is handled to image pickup signal, be equipped with the Electrofax that detects the focusing mechanism of focusing position according to the contrast value of utilizing this filtering mechanism to carry out the image pickup signal of Filtering Processing.
In addition, Electrofax according to this form of implementation, also be that a kind of being equipped with the distance of stipulating moved the focal position, obtained the image pickup signal at each place, focal position, detect the Electrofax of the focusing mechanism of focusing position based on the contrast value of the image pickup signal that is obtained.
In this external form of implementation, be applied to Electrofax as an example of camera, but, also can be applied to silver halide photography machine and television camera, the camera section of portable phone etc. as its example.
Above focusing mechanism of the present invention, camera and focusing position detection method are explained, but the present invention is not limited thereto, self-evident, in the scope that does not exceed purport of the present invention, can carry out various improvement and change.
The effect of invention
Describe in detail as top, according to the present invention, can to infinity by photo-object Carry out accurately focus adjustment.
[symbol description]
1 photographic lens section
2 zoom lens
3 focusing lens
4 imaging apparatus
5 image pickup parts
6 DRAM
7 image treatment parts
8 compression extensions
9 LCD display
10 AF portions
11 CPU
12 protuberances
13 storage cards
14 flash memories
15,16 CD-ROM drive motor/loop portion
17 operating mechanisms
Claims (5)
1, a kind of focusing mechanism having the filtering mechanism that image pickup signal carried out frequency filtering and handle, detecting in the focusing mechanism of focusing position based on the contrast value of utilizing this filtering mechanism to carry out the image pickup signal that frequency filtering handles, is characterized by,
Aforementioned filtering mechanism comprises: the first filtering mechanism that uses of position probing usually; That the infinity position probing is used, with respect to the second different filtering mechanism of the aforementioned first filtering mechanism frequency characteristic; Select the selection mechanism of aforementioned first filtering mechanism or the aforementioned second filtering mechanism as the mechanism that carries out aforementioned frequency filtering processing,
The aforementioned second filtering mechanism has the characteristic that the radio-frequency component of more image pickup signal is passed through with respect to the aforementioned first filtering mechanism.
2, a kind of camera is characterized by, and it is equipped with the described focusing mechanism of claim 1, as the focusing position adjustment of shooting optical facilities.
3, camera as claimed in claim 2 is characterized by, and it comprises; With the focusing position of the infinity position that utilizes aforementioned focusing mechanism to detect, as the storing mechanism that coke number is stored of infinity; Based on be stored in infinity position in the aforementioned storing mechanism to coke number, the indicating mechanism that the infinity position of the focal position of aforementioned photo-optics mechanism is adjusted is carried out in indication.
4, camera as claimed in claim 3, it is characterized by, aforementioned photo-optics structure has the zoom optical facilities, aforementioned storing mechanism with aforementioned infinity position to coke number, with detect become this infinity position to coke number the time the focusing position of infinity position the time focal length that sets stored.
5, a kind of focusing position detection method, image pickup signal is being carried out the frequency filtering processing, contrast value based on the image pickup signal that carried out this frequency filtering processing, and detect in the focusing position detection method of focusing position, it is characterized by, handle as frequency filtering, the first frequency Filtering Processing of selecting common position probing to use, perhaps use as the infinity position probing, the second frequency Filtering Processing that the radio-frequency component of more image pickup signal is passed through with respect to aforementioned first frequency Filtering Processing, image pickup signal being carried out the frequency filtering of aforementioned selection handles, the contrast value of the image pickup signal of handling based on this frequency filtering that carried out detects focusing position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002128752A JP2003322789A (en) | 2002-04-30 | 2002-04-30 | Focusing device, camera, and focusing position detecting method |
| JP128752/2002 | 2002-04-30 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100062910A Division CN1834768B (en) | 2002-04-30 | 2003-04-30 | Focusing apparatus, camera and focus position detecting method |
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| Publication Number | Publication Date |
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| CN1455294A CN1455294A (en) | 2003-11-12 |
| CN1311288C true CN1311288C (en) | 2007-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006100062910A Expired - Fee Related CN1834768B (en) | 2002-04-30 | 2003-04-30 | Focusing apparatus, camera and focus position detecting method |
| CNB031243436A Expired - Fee Related CN1311288C (en) | 2002-04-30 | 2003-04-30 | Focusing device, camera and focusing position checking method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006100062910A Expired - Fee Related CN1834768B (en) | 2002-04-30 | 2003-04-30 | Focusing apparatus, camera and focus position detecting method |
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| Country | Link |
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| JP (1) | JP2003322789A (en) |
| CN (2) | CN1834768B (en) |
Cited By (1)
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| CN101738826B (en) * | 2008-11-17 | 2012-10-24 | 株式会社日立制作所 | Focus control device and focus control method |
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| KR100562406B1 (en) * | 2004-02-19 | 2006-03-17 | 삼성테크윈 주식회사 | Focusing method of digital camera |
| JP4364078B2 (en) * | 2004-06-30 | 2009-11-11 | イーストマン コダック カンパニー | Imaging method and imaging apparatus |
| US7557855B2 (en) * | 2005-01-21 | 2009-07-07 | Canon Kabushiki Kaisha | Focus position detection apparatus and method |
| CN100543575C (en) * | 2005-07-29 | 2009-09-23 | 鸿富锦精密工业（深圳）有限公司 | Autofocus lens |
| CN100407038C (en) * | 2005-12-19 | 2008-07-30 | 佛山普立华科技有限公司 | Automatic focusing method for digit imaging system |
| US7889266B2 (en) * | 2006-11-10 | 2011-02-15 | Nokia Corporation | Image capture in auto-focus digital cameras |
| JP5374065B2 (en) * | 2008-04-07 | 2013-12-25 | キヤノン株式会社 | Imaging apparatus and control method thereof |
| JP5322287B2 (en) * | 2009-05-28 | 2013-10-23 | パナソニック株式会社 | Camera device with turntable |
| JP2011027901A (en) * | 2009-07-23 | 2011-02-10 | Sigma Corp | Imaging apparatus |
| DE102017115021A1 (en) | 2017-07-05 | 2019-01-10 | Carl Zeiss Microscopy Gmbh | Digital determination of the focus position |
| CN108989143B (en) * | 2018-05-25 | 2021-11-12 | 上海华岭集成电路技术股份有限公司 | Automatic test method for universal semiconductor high-speed serial signals |
| JP6994119B2 (en) * | 2018-09-18 | 2022-01-14 | 株式会社日立国際電気 | Imaging device and focus control method |
| CN111294504B (en) * | 2018-12-20 | 2022-02-18 | 展讯通信（上海）有限公司 | Method and device for calculating contrast value in contrast focusing process |
| CN112866541A (en) * | 2019-11-12 | 2021-05-28 | 宏碁股份有限公司 | Device control method and electronic device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1834768B (en) | 2010-05-12 |
| CN1455294A (en) | 2003-11-12 |
| CN1834768A (en) | 2006-09-20 |
| JP2003322789A (en) | 2003-11-14 |
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