CN1700738A - Image input device - Google Patents
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- CN1700738A CN1700738A CN 200510052811 CN200510052811A CN1700738A CN 1700738 A CN1700738 A CN 1700738A CN 200510052811 CN200510052811 CN 200510052811 CN 200510052811 A CN200510052811 A CN 200510052811A CN 1700738 A CN1700738 A CN 1700738A
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Abstract
The present invention provided an image inputting apparatus by which focusing time is short regardless of a position of a focus lens before focusing operation and selected magnification, variation of the focusing time is small and thereby operability is excellent even when a variable focal lens is used. The image inputting apparatus comprises a position detecting means which outputs positional information of a zoom lens (53z) to a control means (102a); and a storage means (102a1) which stores in advance relation between a position of the zoom lens (53z) and a focusing position of the focus lens (53af) corresponding to the position of the zoom lens as Z-F characteristics. The control means (102a) collates output positional information of the zoom lens (53z) with the stored Z-F characteristics and moves the focus lens (53af) to a focal position of the focus lens obtained by collation and then controls a focusing means so that detection of the focusing position is performed on the basis of high frequency components of an image signal.
Description
Technical field
The present invention relates to be equipped with zoom lens and the image-input device of the image of data such as input file and three-dimensional thing, particularly relate to the improvement of the focusing speed in the automatic focus operation.
Background technology
For image processing or the speech in meeting, association and exhibition etc. in computer etc., use the image-input device of the image of the required data of input mostly.
There are all forms as this image-input device, for example there is following data exhibiting device: the body that is taken such as placement data on flat objective table, take from the top simultaneously by the lighting device light projector, the photogra of the body that is taken is presented on the picture of monitoring arrangement, and is projected in (with reference to patent documentation 1) on the screen by projector.
Use Fig. 7 that this existing data exhibiting device 500 is described.
In the figure, data exhibiting device 500 comprises: resources island 551, as the placed side (objective table) of placing data such as file or physical objects; Light projector 552 is as the lighting device of data; Video camera 553 carries CCD (Charge Coupled Device, charge coupled device), and from top shooting data platform 551, and the photographic images that will comprise data is exported as picture signal; Image processing part 554 carries out signal processing to the picture signal of video camera 553 outputs; And video output cable 555, the picture signal (vision signal) that image processing part 554 is exported exports the device outside to.
Auto-focus function uses following method: move the focusing condenser lens that constitutes phtographic lens on optical axis direction, according to judging focusing position from the picture signal of CCD output, keep condenser lens in this position.
Patent documentation 1: the spy opens the 2002-94836 communique
When in above-mentioned data exhibiting device 500, focusing operation, at first, after the body that will be taken is placed on the objective table, push the AF button 500af that is positioned at resources island 551 the place aheads.
Thus, begin the focusing operation according to flow chart shown in Figure 8.
Specifically, connection (ON) operation (S201) by AF button 50af, keep multiplying power mobile focusing lens unchangeably, and estimate (S202) having put aside simultaneously from the magnitude of voltage (hereinafter referred to as the AF evaluation of estimate) of the radio-frequency component of the picture signal of CCD output.
In this is estimated, retrieve the peak (focusing position) (S203, S204) that detects the AF evaluation of estimate by mobile focusing lens repeatedly.
If can the detection peak position, then keep condenser lens then to finish (S205) in this position.
But if change the multiplying power (mobile zoom lens) of zoom lens (the following phtographic lens that is called simply), then the position of amasthenic lens focusing changes with its multiplying power is corresponding.
Therefore, the position of the preoperative condenser lens of no matter focusing and the length of the distance between its focusing position are carried out the focusing operation based on above-mentioned flow chart when changing multiplying power.
In the automatic focus operation, because the detection of peak needs the time the most, the preoperative condenser lens position of therefore focusing is elongated until the needed time of focusing from leaving focusing position, is difficult to no pressure ground operating information exhibiting device.
So, according to the preoperative position of the focusing of condenser lens, in the automatic focus operation, there is the bad problem of asynchronism(-nization) operability until focusing.
In addition, there be the situation that produce obstacle of very long focusing time to speech that need in being taken during body of varying in size of explanation with only multiplying power photography separately and alternatively respectively in speech, the high speed of strong request focusing operation.
These problems are not limited to the data exhibiting device, but be equipped with zoom lens automatically focus the operation image-input device in common problem.
Summary of the invention
Therefore, the present invention's problem to be solved is for providing following a kind of image-input device: no matter focus preoperative condenser lens position and the what state of the multiplying power selected, all the focusing time short, and deviation that should the time is few, the operability excellence.
In order to solve above-mentioned problem, the present application is the device with following structure.
That is, the invention of technical scheme 1 is a kind of image-input device 50, comprising: zoom lens 53b has by mobile on the optical axis direction and focuses and the condenser lens 53af and the zoom lens 53z of multiplying power change; Camera head has imaging apparatus 53c, the body that is taken is taken by above-mentioned zoom lens 53b by this imaging apparatus 53c, and the image that shooting obtains is exported as picture signal; Focusing mechanism, move above-mentioned condenser lens 53af, radio-frequency component based on the above-mentioned picture signal that moves variation along with this detects focusing position, carry out above-mentioned condenser lens 53af is moved to the focusing position of above-mentioned detection and the focusing operation of maintenance, it is characterized in that, comprise: position detecting device, the positional information of output zoom lens 53z; Storage device 102a1 stores the Z-F characteristic as the relation of the focusing position of the position of above-mentioned zoom lens 53z and the above-mentioned condenser lens 53af corresponding with this position in advance; And control device 102a, the Z-F characteristic of above-mentioned positional information and above-mentioned storage is contrasted, obtain the prediction focusing position of above-mentioned condenser lens, above-mentioned condenser lens 53af is moved to this prediction focusing position after, control the detection that above-mentioned focusing mechanism is carried out focal position.
In addition, the invention of technical scheme 2 is as technical scheme 1 described image-input device 50, it is characterized in that, above-mentioned storage device 102a1 stores focusing position and the corresponding a plurality of Z-F characteristics of the distance L between the above-mentioned imaging apparatus 53c with the above-mentioned body that is taken, above-mentioned control device 102a obtains above-mentioned prediction focusing position with the positional information of above-mentioned zoom lens 53z and a contrast of selecting from above-mentioned a plurality of Z-F characteristics.
According to the present invention, played following effect: the focusing time shortens, even and also the do not focus deviation of time of the multiplying power that changes zoom lens, obtain excellent operation.
Description of drawings
Fig. 1 is the outside drawing of the embodiment of expression image-input device of the present invention.
Fig. 2 is the integrally-built block diagram among the embodiment of expression image-input device of the present invention.
Fig. 3 is other block diagrams of the video camera piece among the embodiment of explanation image-input device of the present invention.
Fig. 4 is the curve chart of the relation of the value of condenser lens position among the embodiment of expression image-input device of the present invention and AF input signal.
Fig. 5 is the curve chart of the relation of the focusing position of zoom lens position among the embodiment of expression image-input device of the present invention and condenser lens.
Fig. 6 is the flow chart of the operation of the focusing among the embodiment of explanation image-input device of the present invention.
Fig. 7 is the figure of the existing image-input device of expression.
Fig. 8 is the flow chart of the focusing operation in the existing image-input device.
Embodiment
Utilize Fig. 1~Fig. 6 that embodiments of the present invention are described by preference.
Fig. 1 is the outside drawing of the embodiment of expression image-input device of the present invention.
Fig. 2 is the integrally-built block diagram among the embodiment of expression image-input device of the present invention.
Fig. 3 is other block diagrams of the video camera piece among the embodiment of explanation image-input device of the present invention.
Fig. 4 is the curve chart of the relation of the value of condenser lens position among the embodiment of expression image-input device of the present invention and AF input signal.
Fig. 5 is the curve chart of the relation of the focusing position of zoom lens position among the embodiment of expression image-input device of the present invention and condenser lens.
Fig. 6 is the flow chart of the operation of the focusing among the embodiment of explanation image-input device of the present invention.
Utilize Fig. 1 that the surface structure of the image-input device 50 of embodiment is described.
This image-input device 50 comprises: resources island 51, as the placed side (objective table) of placing data such as file and physical objects; Light projector 52 is as the lighting device of data; Video camera 53 is equipped with CCD 53c and from top shooting data platform 51 directions, the Dynamic Photography image that will comprise data is exported as picture signal; And support 53a, support this video camera 53.
In Fig. 1, the position (L) when having indicated the position (H) (chain-dotted line) of the video camera 53 when extending most and cripetura.
On the other hand, at the front of resources island 51 a side setting operation dish 55.
In this operation board 55, be provided with the flexible switch 55d of mains switch 55a, zoom button 55b, focusing knob 55af, light projector switch 55c, support 53a etc.
In addition, be equipped with in the inside of device: control part 54, carry out the signal processing of picture signal of video camera 53 output and the control of device itself; With output line 55, the picture signal (comprising the vision signal of rgb signal etc.) of control part 54 outputs is exported to the device outside.
This image-input device 50 has auto-focus function (focus function automatically), adopts the user can set the zoom lens at photography visual angle arbitrarily to phtographic lens 53b.
This zoom lens 53b has: the zoom lens 53z that moves on optical axis direction in order to obtain desired multiplying power; The condenser lens 53af that on optical axis direction, moves for focusing; And motor 60af, the 60z of drive lens separately drive units such as (not shown among Fig. 1).
Therefore, according to this image-input device 50, following using method all is fine: manually focusing does not just obtain the picture of focusing, and takes the integral body picture of the big body that is taken and reset, or enlarges the part of the body that is taken and playback etc.
Next, utilize Fig. 2, Fig. 3 that the basic structure of the control part 54 in the image-input device 50 of embodiment is described.
This control part 54 as shown in Figure 2, is made of video camera piece 101, sub-piece 102 and lens block 103.
At first, utilize Fig. 3 that video camera piece 101 is elaborated.
Video camera piece 101 at first has imaging apparatus 53c, front processing circuits A/D transducer 7b and image processing circuit 7c.
Imaging apparatus 53c also exports as the imaging apparatus output signal of analog picture signal from the optical image generation of the body that is taken.To this imaging apparatus 53c, can use above-mentioned CCD as an example.Can certainly be other imaging apparatus.
Front processing circuits A/D transducer 7b will be converted to continuous digital signal from the imaging apparatus output signal of imaging apparatus 53c output, and export as scan image signal.
In addition, video camera piece 101 also has central arithmetic processing apparatus 7e, image rate conversion device 7d and D/A converter 7f and timing sequencer 7g.
The arithmetic processing apparatus 7e of central authorities, the control of unified these data exhibiting device 50 integral body, and output is to the order and the clock signal of each piece.
Image rate conversion device 7d will export as digital video signal with above-mentioned clock signal is corresponding from the picture signal of image processing circuit 7c output.
D/A converter 7f will be converted to analog signal from the digital video signal of image rate conversion device 7d output, and will be corresponding to above-mentioned clock signal the output of the outside of image-input device 50.
The analog video signal of this output is offered the playback of external equipments such as monitoring arrangement.
In addition, video camera piece 101 also has memory element 7j.
This memory element 7j has the function according to instruction above-mentioned picture signal of storage or digital video signal, for example can carry out following operation.
Promptly, when the data on the replacement resources island 51 is carried out the replacement placement of next presentation data, directly this replacement of playback is placed and is operated then dignity inadequately on screen, therefore will replace the picture signal of placing preceding data etc. in advance is stored among the memory element 7j, replace to place the picture signal that continues the output storage in the operation, the photographs of the next data of output behind the EO and on screen, resetting.
Next, utilize Fig. 2 antithetical phrase piece 102, lens block 103 to be elaborated.
Sub-piece 102 has sub-CPU 102a.
This sub-CPU 102a, according to from the order of central arithmetic processing apparatus 7e and from each switch (button) 55a~55d of operation board 55, the output signal of 55af, manage the control of zoom operation and focusing operation and light projector 52 and the external device (ED) (not shown) that is connected with this device 50.
Lens block 103 has camera lens CPU 103a, zoom drive device 103b and focus driver 103c.
Camera lens CPU 103a is according to the control command from sub-CPU 102a, respectively to the order of zoom drive device 103b, focus driver 103c output about zoom operation and focusing operation.
Order according to this output, two driver 103b, 103c drive interior being used to of phtographic lens 53b and drive the motor 60z of zoom lens and be used to drive condenser lens motor 60af, thereby mobile zoom lens 53z and condenser lens 53af on optical axis direction will incide CCD 53c with the picture that the multiplying power (visual angle) that requires is focused respectively.
In addition, the positional information of zoom lens 53z and condenser lens 53af detects by position-detection sensor 61z, 61af respectively, and is output the 103a to camera lens CPU.
Thus, central arithmetic processing apparatus 7e and sub-CPU 102a can carry out all control based on this positional information.
Next, the operation of the focusing in the image-input device 50 of embodiment (automatic focus operation) is elaborated.
As mentioned above, mobile focusing lens 53af on optical axis direction, the peak value of having put aside from the magnitude of voltage (AF evaluation of estimate) of the radio-frequency component of the picture signal of CCD 53c output is obtained in retrieval, keep condenser lens 53af in the position of giving this peak value, focus thus and judge and basic focusing operation.
Wherein, Fig. 4 represents an example of the relation of the position of the condenser lens 53af in the pick-up lens and AF evaluation of estimate.This figure is that the position of zoom lens 53z is positioned at the relation under the situation that positioning index described later is 970 position.
In the figure, transverse axis has represented that by the index expression of expression condenser lens 53af the distance of the big more condenser lens 53af of numerical value of this index and the body that is taken is short more (video camera 53 and the body that is taken are near more).
In the figure, when the position of condenser lens 53af was the position of index 376 as can be known, the AF evaluation of estimate was a peak value, focusing this moment.
In the explanation after this,, the telescopic location of the support 53a of support cameras 53 is fixed on the central authorities of its flexible scope for easy understanding.(tell about later on for making the flexible situation of this support 53a.)
Therefore, the distance L between the front end of phtographic lens 53b and the resources island 51 is fixed, in an embodiment distance L=401.5mm.
As mentioned above, as the position of condenser lens 53af in the phtographic lens 53b of focusing, by zoom ratio, be that the position of the zoom lens 53z in the phtographic lens 53b is determined.
Fig. 5 represents the relation of position of the condenser lens 53af of the position of these zoom lens 53z and focusing.
In the figure, the characteristic with dotted line (black nahlock curve) expression is above-mentioned distance L=401.5mm.
The numerical value of the longitudinal axis and transverse axis is respectively the index of the position of expression condenser lens 53af and zoom lens 53z, and is near more for the big more expression condenser lens of the numerical value 53af range data platform 51 of longitudinal axis index.
In addition, big more for the big more expression multiplying power of transverse axis numerical value, in this phtographic lens 53b, obtain having represented the data of this scope from 1 times to 12 times multiplying power.
In an embodiment, the relation (hereinafter referred to as the Z-F characteristic) of the position of the position of the zoom lens 53z that this is shown in Figure 5 and condenser lens 53af is stored among the memory 102a1 of sub-CPU 102a (with reference to Fig. 2).
By sub-CPU 102a control focusing operation, so that it is carried out according to flow chart shown in Figure 6.
This flow chart is described.
At first, the AF button 50af of operator presses operation board 55 makes its connection (S1).
By this connection information, sub-CPU 102a obtains positional information (S2) at this moment zoom lens 53z from camera lens CPU 103a.
Sub-CPU 102a is with the positional information and the Z-F characteristic contrast that is stored in memory 102al of the zoom lens 53z that obtains, and the position (hereinafter referred to as the FL focusing position) of the condenser lens 53af the during focusing under this multiplying power that obtains predicting (S3).
Sub-CPU 102a is to camera lens CPU 103a order, and amasthenic lens 53af is moved to the FL focusing position that obtains, camera lens CPU 103a orders according to this, by focus driver 103c condenser lens 53af is moved to FL focusing position (S4).
After this moves, carry out the peak value retrieval (S5) of AF evaluation of estimate.
Carry out the judgement (S6) whether the AF evaluation of estimate arrives peak, then be not moved further condenser lens 53af retrieval peak value if arrive (denying).
If arriving (being) then remains on this position with condenser lens 53af and finishes focusing operation (S7).
According to the focusing of this embodiment operation, before estimating the AF evaluation of estimate, the position when in advance condenser lens 53af being moved to focusing under this multiplying power of prediction, therefore the AF evaluation of estimate is positioned near the peak substantially when estimating beginning.
Therefore, can extremely shorten evaluation time.That is the operation of focusing very at high speed.
In addition, according to this method, owing to no matter be positioned at which position at focusing operation prefocusing lens 53af, the AF evaluation of estimate when estimating beginning is all roughly the same, the position of the condenser lens 53af before therefore no matter operating, evaluation time almost fixed.That is, the deviation of the focusing service speed that is caused by multiplying power disappears.
Therefore, the image-input device 50 of embodiment, the excellent in operability of relevant its automatic focus 53af.
And, when using this device, can very smooth carrying out to the input of image processing apparatus etc. and speech etc.
Next, the flexible situation of the support 53a of support cameras 53 is described.
As mentioned above, support 53a is flexible can to change video camera 53 and the distance between the body of being taken by making.
This function can provide the big or small corresponding optimal viewing angle with the body that is taken, and is therefore very effective as image-input device.
When using zoom lens, if the distance L of the phtographic lens 53b and the body that is taken changes then above-mentioned Z-F characteristic changing.
In the image-input device 50 of embodiment, this distance L is changed in the scope of 338mm~465mm.About in Fig. 5, representing in the Z-F of its both end sides characteristic.
In the figure, connected the solid line of full coat piece and hollow block, the Z-F characteristic when being respectively L=338mm and L=465mm.
The minimum of storing zoom lens 53z in these two curve ranges and condenser lens 53af in the memory 102a1 of sub-CPU 102a in advance drives the Z-F characteristic of spacing.
And,, will export sub-CPU 102a (with reference to Fig. 2) to by camera lens CPU 103a from the information (hereinafter referred to as distance L information) of the distance L of this transducer for example at the pars contractilis of support 53a configuration stroke transducer 61p.
When the focusing operation, the positional information of the zoom lens 53z that CPU 103a will obtain as mentioned above and this distance L information and the Z-F characteristic contrast that is stored in memory 102a1 obtain the FL focusing position (prediction focusing position) under this multiplying power and this distance L.
Thereafter, focus when operation according to the flow chart of Fig. 6, no matter the telescopic location of support 53a can have focusing velocity deviation ground with high accuracy and not carry out at a high speed focusing operation.
In addition, the capacity of memory 102a1 hour in order to reduce canned data amount within it, can also be stored the Z-F characteristic of this selected distance from selected several distances in the variable range of distance L.
At this moment, in the control operations that the S3 with Fig. 6 represents, select and Z-F characteristic, carry out contrast with it from the value minimum distance of the distance L information of stroke transducer.
On the other hand, also the button that can change distance L can be set on operation board 55, the operation by this button not telescope support 53a just can change the setting of distance L according to operator's intention.
Thus, when the body that is taken is three-dimensional thing, want the position of focusing than 51 of resources islands during near camera lens 53b, can revise this near the distance of part, can carry out focusing operation the most at a high speed.
And then, also the position of the condenser lens 53af that can obtain with the position of zoom lens 53z and from the peak value of AF evaluation of estimate contrasts with the Z-F characteristic, obtain the distance L 1 at position of the body that is taken of actual focusing by the Z-F characteristic, carry out focusing operation after this based on the Z-F characteristic of this distance L 1.
Thus, even under the frequent situation about changing of the height at the position of wanting to focus, also not with the setting of manual change distance L automatically based on the operation of focusing of the Z-F characteristic of optimum distance L, so operability further improves.
In addition, when the amount of information that is stored in memory 102a1 further reduces, as mentioned above, also can be used as the Z-F characteristic of the centre distance of the selected variable range of typical value, store this Z-F characteristic for contrast.
In addition, the Z-F characteristic has the scope that is roughly straight line and the scope of curve as shown in Figure 5.Wherein, in the scope of straight line (for example the position of zoom lens discontented 1000), make when memory point is sparse to be contrasted to use approximate expression more, in the scope (more than 1000) of curve, make that memory point is intensive to be contrasted.
Thus, even information memory capacity can not have the focusing operation that focusing velocity deviation ground carries out high speed with high accuracy less yet.
In addition, also can make near the memory point usage frequency is high in the Z-F characteristic the multiplying power intensive.
The extra high multiplying power of usage frequency (zoom lens position) is the multiplying power horizontal or vertical and that display frame roughly enlarges comparably of A4 size.
This zoom lens position in an embodiment, under the situation of distance L=465mm, A4 is horizontal to be 574, and A4 is vertical to be 234, and under the situation of distance L=338, A4 is horizontal to be 232.(A4 indulges outside the moving range of zoom lens)
Therefore, store near the characteristic in position of each zoom lens in the distance L separately thick and fast, when sparsely storing other scope, operate even information memory capacity also can have the focusing of carrying out high speed in focusing velocity deviation ground with high accuracy less.
Certainly, also can and use with the method for this frequency corresponding stored and with the method for above-mentioned characteristic curve corresponding stored.
Embodiments of the invention are not limited to said structure and order, also are fine in the variation of the scope that does not break away from purport of the present invention.
Image-input device is not limited to structure shown in Figure 1.
Also can be the image-input device of following structure, has the video camera portion that utilizes zoom lens to pass through to focus automatically input picture, at this video camera portion shooting data (body is taken), with captured image information to outputs such as image display device and image processing apparatus.
In addition, pick-up lens can not be fixed also.Also can be as follows: can change pick-up lens, the zoom lens have with the variable power of the corresponding the best of body and use that is taken is installed.
At this moment, can be in advance with the storage of the above-mentioned Z-F characteristic of each camera lens that can change in memory, or can store from the outside input as required.This structure increases or improvement camera lens when making characteristic changing in the kind of the camera lens that can change, can append or new data more, and is therefore very convenient.
Claims (2)
1, a kind of image-input device comprises:
Zoom lens has by mobile on the optical axis direction and focuses and the condenser lens and the zoom lens of multiplying power change;
Camera head has imaging apparatus, the body that is taken is taken by described zoom lens by this imaging apparatus, and the image that shooting obtains is exported as picture signal;
Focusing mechanism moves described condenser lens, and the radio-frequency component of the described picture signal that changes based on moving along with this detects focusing position, carries out described condenser lens is moved to the focusing operation of detected focusing position and maintenance, it is characterized in that, is provided with:
Position detecting device is exported the positional information of described zoom lens;
Storage device is stored the Z-F characteristic as the relation of the focusing position of the position of described zoom lens and the described condenser lens corresponding with this position in advance; And
Control device contrasts described positional information and described Z-F characteristic, obtains the prediction focusing position of described condenser lens, described condenser lens is moved to this prediction focusing position after, control the detection that described focusing mechanism is carried out focusing position.
2, image-input device according to claim 1 is characterized in that,
Described memory device stores and the focusing position of the described body that is taken and the corresponding a plurality of Z-F characteristics of distance between the described imaging apparatus,
Described control device with the positional information of described zoom lens and a contrast of selecting, is obtained described prediction focusing position from described a plurality of Z-F characteristics.
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CN101697571B (en) * | 2009-10-23 | 2011-08-24 | 东莞光阵显示器制品有限公司 | Method for imaging minisize large-visual-angle polygon and novel camera device |
CN102393557A (en) * | 2011-10-28 | 2012-03-28 | 东莞市普密斯精密仪器有限公司 | Manual zoom-stereo lens capable of automatically detecting fixed zoom ratio |
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