CN1510498A - Digital camera device with self-focusing system and method thereof - Google Patents

Digital camera device with self-focusing system and method thereof Download PDF

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Publication number
CN1510498A
CN1510498A CNA021585261A CN02158526A CN1510498A CN 1510498 A CN1510498 A CN 1510498A CN A021585261 A CNA021585261 A CN A021585261A CN 02158526 A CN02158526 A CN 02158526A CN 1510498 A CN1510498 A CN 1510498A
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image
voltage
automatic focusing
lens
focusing
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CNA021585261A
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CN100347603C (en
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张辉
俞青
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Vimicro Corp
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Vimicro Corp
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Abstract

A digital camera shooting device consists of a main controller unit an image transducer, an image processing unit, a storage unit, a keyboard unit and output interface, a lens unit and automatic focusing circuit and a microprocessor. In addition, the present invention discloses also an automatic focusing method by using electric voltage to regulate focal length.

Description

The digital camera and the method that have autofocus system
Invention field
The present invention relates to a kind of digital camera, relate in particular to a kind of digital camera of autofocus system and method for focusing automatically of having.
Background technology
In existing camera technique, to use autofocus system usually.In the shooting process of image, the distance between camera head and the subject is often change, so regular meeting causes image blurring because of exceeding field depth.In order to make image keep clear, just must in the process of finding a view, change the focal position of camera lens, make image keep clear.The process of this adjusting focal position is called focusing or focusing.
Nowadays Autofocus Technology has been widely used in capture fields such as camera, video camera and image scan.It makes image-taking system to adjust the position of focusing mirror group in the camera lens automatically according to the distance of object, and object is imaged on the imaging plane clearly.The automatic focusing mode of traditional optical image-taking system has a variety of, is broadly divided into two classes: a class is active focusing mode, comprises infrared mode and ultrasound wave mode; Another kind ofly be passive type focusing mode, more representational have " solid-state triangulation " system (SST, SolidState Triangulation) and TTL (Through The Lens) mode.
In the digital image acquisition system of automatic focusing mode that with TTL is main flow, the structure of camera head is simple relatively: directly the ccd sensor from the pick-up lens back takes out picture signal, through the microcomputer analysis, adjust the Focusing mechanism of camera lens according to the computing result.It is correct to be characterized in having remote focusing, and focusing does not have advantage such as parallax, equal cisco unity malfunction when weak point is that too dark and subject contrast is hanged down when light.
And in other traditional automatic focusing mechanisms, need use mechanical driving device, as driving motor and mechanical transmission component.Number of patent application is 98100959.X's the application of " method of focusing automatically ", a kind of automatic focusing method is disclosed, its inventive point is to find out the position that scanned middle intensity profile is the widest or contrast is the strongest, or with the position of alignment lens desire focusing, and the adjustable extent of setting optical element focal length, when starting focusing instruction automatically, the focal length adjusting mechanism moves with the almost constant speed and drives the electric image signal eigenwert that optical element is found out corresponding different light path or focal length, and in above-mentioned linear sweep process, simultaneously the eigenwert of picture signal is done progressively linear analysis relatively, only keep being scanned up to this place best features value and pairing focal position thereof before.Utilize the focal length adjusting mechanism to adjust the corresponding focal length that optical element has the best features value to all focal position at last, just finish automatic focusing program.
Yet, change the position of focus lens by the gearing of machinery, thereby change the method for the focal position of camera head, its defective is, because the restriction of mechanical driving device precision when work, the loss of function can take place in shooting process, makes the work effect reduce, and the scarce capacity that reflects fast; Make that simultaneously the physical construction of camera head inside is too numerous and diverse, for the today that is in the science and technology fast development, any articles for use are all made every effort under the modern consumption idea of exquisiteness, and this obviously is a very big deficiency.Because traditional automatic focusing mechanism is when using mechanical driving device, need give enough spaces gives camera lens and gearing and adjusts motion to carry out front and back, thereby spatially can increase the size of camera head, bring the problem that increases volume to camera head.
At last, in traditional camera head, there is the error that mechanical transmission mechanism and camera lens produces and the unclear problem of imaging that causes in the processing and the process of installing.
Summary of the invention
The object of the present invention is to provide a kind of digital camera of having avoided above-mentioned problem, it can be controlled a kind of novel lens by the voltage circuit of a peripheral hardware and focus automatically.
Another object of the present invention also is to provide a kind of voltage-regulation focal length that utilizes to finish the method for auto-focus process.
In order to satisfy above-mentioned purpose, solution of the present invention is as follows:
A kind of digital camera that has autofocus system comprises following device and part: automatic focusing Main Control Unit, automatic focusing lens unit, imageing sensor CCI or CMOS, microcontroller, graphics processing unit, the circuit of focusing automatically.
The present invention also comprises A/D (A/D converter), removable memory module or built-in image storage unit, keyboard unit and output interface.
Storage unit can be used for storing the instant image in the shooting process.
Keyboard unit is mainly used in the order of accepting master controller, work such as the shooting of carries out image.
Output interface mainly contains the computing machine communication interface, connects the video interface and the interface that is connected printer of televisor.Wherein, the communication interface of computing machine can have serial line interface, parallel interface, USB interface and scsi interface.
Thereby automatic focusing camera head of the present invention can be directly connected on computing machine, televisor or the printer, can also be directly connected on mobile telephone or the hand-held PC.
In the process of camera head pickup image, because the sensor devices CCD or the CMOS of digital camera, be to make by semiconductor material, can convert light to digital signal by the analog to digital converter chip, thereby imageing sensor is when obtaining a sub-picture, change resulting image into digital signal, image digital signal is entered in the image processor and is handled, and calculates and judges via the automatic focus algorithm modules A F in the graphics processing unit; Microcontroller MCU is according to pulse width modulating signal PWM of result output of graphics processing unit subsequently, this is a pulse ac that comprises component of voltage and current component, this alternating current carries out filtering by the electric capacity of establishing in the automatic focusing circuit again, produce the voltage of pulse, after the pulse current of elimination DC component transferred to transformer and regulate, input also the control focusing lens to change its radius-of-curvature.In the process that graphics processing unit ceaselessly compares and treats picture signal, the pairing pulse current of distinct image is chosen, and its lens radius of curvature of regulating is also correspondingly selected thereupon.In the process that a scenery is made a video recording, what said process was not stopped carries out repeatedly, reaches optimum value up to image definition, and the radius-of-curvature to focus lens also no longer changes automatically, and the image effect of this moment reaches optimum condition.
The invention also discloses a kind of voltage-regulation focal length that utilizes to finish the method for automatic focusing, its step is as follows:
At first camera head carries out initial image-capture to the scenery that will take;
The picture signal that is grasped is through the Flame Image Process of automatic focus algorithm;
By analysis and the result of microcontroller according to image, export an electric signal, this electric signal can be PWM, also can be GPIO;
Again by one automatically the focusing circuit this electric signal is handled, the Control of Voltage after the processing to the variation of the radius-of-curvature of focus lens, finally realizes the automatic adjusting of focusing automatically;
Different image correspondences different pwm signals or GPIO signal, thus the radius-of-curvature of corresponding different lens;
Above-mentioned steps is constantly carried out repeatedly, up to selecting the pairing focal length of distinct image, reaches the purpose of obtaining picture rich in detail.
Advantage of the present invention:
The digital camera that has autofocus system still can be taken very distinct image when luminosity is imperfect in image production process, and the quality of image and luminosity all are good forever.
Owing to used a kind of novel lens in the present invention, this lenslet can be regulated the radius-of-curvature of himself by peripheral hardware voltage, this makes the present invention no longer need traditional machinery focusing interlinked mechanism automatically, and can produce the lens of an automatic focusing and zoom.And the brand-new lens formed by the variable light lens of new type lens, it is characterized in that these lens are made up of two kinds of non-meltable liquid with equal densities, this makes that two kinds of liquid radius-of-curvature each other changes evenly, stable working state, the very big error of having avoided the mutual grinding between the lens to cause simultaneously, and can produce the variation that comprises vertical direction in any direction, thereby being used for fast automaticly during to focus lens, the present invention has more dirigibility and better job stability in auto-focus process.
The present invention be advantageous in that, owing to be to control automatically the automatic focusing activity of focus lens with voltage, thereby the present invention is except having very outstanding optical signature, can also make digital camera make reaction extremely fast in a short period of time, can avoid resembling the traditional automatic focusing camera head image that the mutual grinding between the lens causes in auto-focus process production deviation simultaneously.
At last, make the present invention have little, the wear-resistant very competent and outstanding advanced parts such as soundness of power consumption to all characteristics that focus lens determined automatically by brand-new.
Above and other objects of the present invention, feature and advantage are from below in conjunction with accompanying drawing be not will become more obvious the specific descriptions of certain embodiments.
Description of drawings:
Accompanying drawing 1 is the work block diagram that has the novel digital camera head of intelligent autofocus system.
Accompanying drawing 2 is the workflow diagrams that have the novel digital camera head of intelligent autofocus system.
Accompanying drawing 3 is the Flame Image Process process flow diagrams that have the novel digital camera head of intelligent autofocus system.
Accompanying drawing 4 is the novel digital camera head Flame Image Process schematic diagrams in once focusing process that have intelligent autofocus system.
Accompanying drawing 5 is first kind of automatic Principles of Regulation figure to focus lens.
Accompanying drawing 6 is second kind of automatic Principles of Regulation figure to focus lens.
Concrete embodiment
In the following description, known function or structure will no longer describe in detail, to avoid there be unnecessary obscuring with content of the present invention.
Digital camera and the method that has autofocus system disclosed in this invention, can finish by following device and step:
In the process of photographed, image-capture work at the beginning of making a video recording by the 1 pair of image that will take of image inductor, image changes light into electric charge by A/D digital conversion circuit 8, enter graphics processing unit 7, calculate and the sharpness of image is judged by the automatic focus algorithm modules A F 3 in the graphics processing unit, microcontroller MCU 4 is according to pwm pulse bandwidth modulation signals 5 of result output of graphics processing unit 7, thereby further generate a pulse ac voltage that comprises component of voltage and DC component, this pulse current enters filter capacitor 11 and carries out filtering, become the pulse current of elimination DC component, pass through the adjusting of transformer 12 again, be transferred to automatically to focus lens 6 places, the corresponding variation takes place in the radius-of-curvature of regulating automatically focus lens, thereby makes the focus of lens be adjusted to the most appropriate position with respect to subject step by step.
As shown in Figure 2, camera head is when capturing image, by sensor 1 image information is sent in the graphics processing unit 7, calculate and the sharpness of image is judged by the automatic focus algorithm modules A F 3 in the graphics processing unit 7, microcontroller MCU 4 is according to calculating and pwm pulse bandwidth modulation signals 5 of analysis result output of graphics processing unit simultaneously, thereby generate the alternating current that comprises component of voltage and DC component of a pulse, this pulse current enters automatic focusing circuit 9 subsequently; In the circuit 9 of focusing automatically, voltage through filter capacitor 11 filtering after, elimination DC component wherein, filtered electric current is through the amplification of a transformer 12, enter automatically to focus lens 6, utilize the surface tension of non-meltable liquid, automatic radius-of-curvature to focus lens is changed.Therebetween, the pulse current correspondence of each different elimination DC component different radius-of-curvature.This process is continuously carried out, imageing sensor 1 also ceaselessly is sent back to each width of cloth image in the graphics processing unit 7, and at any time all instant images are judged by it, up to choosing distinct image, this pairing pulse current of picture rich in detail will be chosen to be the needed pulse current of pinpointed focus so, select corresponding automatic radius-of-curvature by the pulse current of this elimination DC component, thereby reach the purpose of automatic focusing focus lens 6.
As shown in Figure 3, choose in the process at image each time, after image sensing unit 1 carries out initial extracting, picture signal is sent in the graphics processing unit 7, being given an order by master controller 2 simultaneously temporarily is stored in image in the image storage unit, the pulse voltage that every width of cloth image is corresponding different is also corresponding different automatically to the radius-of-curvature of focus lens.Behind repeatedly image-capture and Flame Image Process, judgement by graphics processing unit 7, pick out distinct image, to the judgement information of master controller 2 output about picture rich in detail, and the pulse current of selected corresponding picture rich in detail, the focal length of lens that this pulse current is regulated is the most appropriate focal length; Given an order to keyboard unit 10 by master controller 2 and take this moment.
When graphics processing unit was handled image information, its principle was as follows: at first by the automatic focus algorithm module 3 of the AF in the image microprocessor 7, all picture signals are calculated and judgment processing, to select distinct image; Simultaneously, microcontroller MCU 4 is according to calculating and the analysis result of focus algorithm AF 3 are exported a pulse width modulating signal PWM 5 automatically, generate a pulse ac electricity that comprises component of voltage and DC component, this alternating current enters automatic focal adjustment circuit 9 subsequently.The pulse current that each width of cloth image is corresponding different based on the signal that graphics processing unit 7 is sent, is selected the most appropriate pulse current, to realize the most appropriate adjusting to the automatic focusing focal length of lens.
As shown in Figure 4, in the process that camera head of the present invention is made a video recording, under the coordination of master controller 2, at first by image sensing cell 1, picture signal changes electric charge into through digital conversion circuit A/D8 and enters in the graphics processing unit 7.In graphics processing unit 7, earlier calculate and analyze by the 3 pairs of picture signals of automatic focus algorithm AF module in the processing unit, microcontroller MCU 4 exports a pulse width modulating signal PWM 5 according to the result who calculates and analyze, and the pulse current of Sheng Chenging enters the lens adjustment circuit 9 of automatic focusing subsequently.
As shown in Figure 5, in the process that camera head of the present invention is made a video recording, image sensing cell 1 is after choosing image, at first picture signal changes electric charge into by digital conversion circuit, send images in the graphics processing unit 7, it is calculated and judge by the automatic focus algorithm modules 3 of AF in the graphics processing unit 7; Meanwhile, microcontroller MCU 4 is according to calculating and the analysis result of focus algorithm modules A F 3 are exported a pulse width modulating signal PWM 5 automatically, and then export the alternating current that comprises component of voltage and DC component of a pulse, this pulse current is by filter capacitor 11 elimination DC component, adjusting through transformer 12, enter automatically focus lens 6, regulate automatically, make the focus of lens be in the most appropriate position the variation of focus lens 6 radius-of-curvature sizes.
Because in this lens combination is two kinds of non-meltable liquid, so it has the advantages that to be included in the vertical direction adjusted in any direction.
As shown in Figure 6, image sensing unit 1 is after choosing image, send images to graphics processing unit 7 interior calculating and analysis and judgement by automatic focus algorithm AF 3, microcontroller MCU 4 is according to calculating and general input/output signal GPIO 13 of analysis result output of graphics processing unit simultaneously, modulation through pulse-length modulation chip PWMIC 14, the alternating current that comprises component of voltage and DC component of output pulse, again by filter capacitor 11 eliminations pulse direct current component wherein, filtered electric current is through after the adjusting of transformer 12, enter automatically to focus lens 6, regulate its radius-of-curvature variation, thereby reach the purpose of automatic focusing.
Method disclosed by the invention can realize by described device of above-mentioned embodiment and step.Wherein, automatically focus lens is made up of two kinds of non-meltable liquid, these two kinds of liquid have identical density.And its technical foundation is a kind of variable light technology.
Digital camera of the present invention and method, be not restricted to listed utilization in instructions and the embodiment, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details, representational equipment and illustrates here and describe.

Claims (10)

1. the present invention relates to a kind of digital camera that has autofocus system, comprising:
A Main Control Unit, an imageing sensor, a graphics processing unit, a storage unit, a keyboard unit, an output interface unit, a lens unit, a microcontroller is characterized in that:
Described device also further comprises a focusing circuit automatically; With
Described lens unit is a lens devices that can change its focal length by Control of Voltage;
An automatic focus algorithm modules A F is set in the described graphics processing unit.
2. the digital camera that has autofocus system as claimed in claim 1 is characterized in that, the function of described automatic focusing circuit is, is the circuit that an electric signal that sends according to microcontroller is controlled the lens unit focal length variations.
3. the digital camera that has autofocus system as claimed in claim 1 or 2, it is characterized in that, in the described automatic focusing circuit, comprise that but the filter capacitor of a DC component in the elimination pulse current and one have and can will output to the transformer of automatic focusing lens function after the filtered electric current adjustment.
4. method of utilizing the automatic focusing of voltage-regulation focal length, can realize by following step:
A at first arbitrarily obtains multiple image by digital camera, simultaneously multiple image is carried out graphical analysis and processing;
B. in the acquisition process of image, at any time instant all images is analyzed, finds out distinct image;
C. determine pinpointed focus according to the pairing voltage of distinct image.
5. the method for utilizing the automatic focusing of voltage-regulation as claimed in claim 4 is characterized in that, described step C finishes by the circuit of focusing automatically, by the DC component of the electric capacity elimination pulse in the circuit.
6. the method for utilizing the automatic focusing of voltage-regulation as claimed in claim 4, it is characterized in that, in the process of Flame Image Process, different image correspondences different magnitudes of voltage, this magnitude of voltage determined by pwm signal or GPIO signal, thereby decides the different focal of lens according to the magnitude of voltage of those images.
7. the automatic focusing method of utilizing voltage-regulation as claimed in claim 4, it is characterized in that, the processing of the described picture signal of steps A is to be calculated and analyzed by the image information that automatic focus algorithm modules A F beams back imageing sensor, and will calculate and analysis result send among the microcontroller MCU.
8. the method for utilizing the automatic focusing of voltage-regulation as claimed in claim 4, it is characterized in that, in the described image processing process of steps A, after the calculating and processing of picture signal through the automatic focus algorithm modules A F in the graphics processing unit, microcontroller MCU exports one and the corresponding pulse electrical signal of processing result image according to calculating and the analysis result of AF.
9. the method for utilizing the automatic focusing of voltage-regulation as claimed in claim 8 is characterized in that, the electric signal of described microcontroller MCU output can be a pulse width modulating signal PWM, can also be a general input/output signal GPIO.
10. the method for utilizing the automatic focusing of voltage-regulation as claimed in claim 9 is characterized in that, after described microcontroller MCU generated a general input/output signal GPIO, the pulse-length modulation chip PWMIC that is provided with in the input circuit handled.
CNB021585261A 2002-12-25 2002-12-25 Digital camera device with self-focusing system and method thereof Expired - Fee Related CN100347603C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101420526B (en) * 2007-10-26 2011-06-08 鸿富锦精密工业(深圳)有限公司 Image sensor bearing device and camera module group
WO2012126324A1 (en) * 2011-03-21 2012-09-27 Carestream Health, Inc. Autofocus method using liquid lens
CN108156371A (en) * 2017-12-08 2018-06-12 北京航天计量测试技术研究所 A kind of infrared auto-focusing method for fast searching

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FR1593883A (en) * 1968-02-17 1970-06-01
JPS61140908A (en) * 1984-12-13 1986-06-28 Olympus Optical Co Ltd Automatic focus adjusting device in endoscope
JPS6236632A (en) * 1985-08-09 1987-02-17 Matsushita Electric Ind Co Ltd Lens device for automatic focusing
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CN1220111C (en) * 2001-04-12 2005-09-21 株式会社理光 Camera
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101420526B (en) * 2007-10-26 2011-06-08 鸿富锦精密工业(深圳)有限公司 Image sensor bearing device and camera module group
WO2012126324A1 (en) * 2011-03-21 2012-09-27 Carestream Health, Inc. Autofocus method using liquid lens
US9204788B2 (en) 2011-03-21 2015-12-08 Carestream Health, Inc. Autofocus method using liquid lens
CN108156371A (en) * 2017-12-08 2018-06-12 北京航天计量测试技术研究所 A kind of infrared auto-focusing method for fast searching

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