CN101329492A - Automatic focusing system - Google Patents
Automatic focusing system Download PDFInfo
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- CN101329492A CN101329492A CNA2007100750883A CN200710075088A CN101329492A CN 101329492 A CN101329492 A CN 101329492A CN A2007100750883 A CNA2007100750883 A CN A2007100750883A CN 200710075088 A CN200710075088 A CN 200710075088A CN 101329492 A CN101329492 A CN 101329492A
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- microprocessor
- image
- sharpness
- step motor
- autofocus system
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Abstract
The invention relates to an automatic focusing system which comprises: an image induction module used for inducing the image to be shot, a clarity computation module used for calculating the clarity of the image, a step motor used for controlling the movement of a focusing lens, a microprocessor used for comparing the image clarity so as to sand out a control command to control the step motor to rotate, and a motor drive engine used for receiving the command of the microprocessor so as to drive the step motor to rotate corresponding to the command. The automatic focusing system of the invention has the advantages of high utilization of the microprocessor resources.
Description
[technical field]
The present invention relates to a kind of digital camera, relate in particular to a kind of autofocus system that is used for digital camera.
[background technology]
In existing camera technique, to use autofocus system usually.In the shooting process of image, the distance of camera head and subject is often change, therefore can exceed field depth and causes image blurring.In order to make image keep clear, just must in the process of finding a view, adjust the focal position of camera lens, make image keep clear.The process that this focal position is regulated is called focusing or focusing.
Autofocus Technology has been widely used in capture fields such as camera, video camera and video scanner.It makes image-taking system subject to be imaged on the imaging plane clearly according to the far and near position of adjusting the camera lens focus automatically of subject.The automatic focusing mode of traditional optical image-taking system has a variety of, generally adopts the method for computed image sharpness to judge whether camera lens is in best focusing position.
Traditional camera head autofocus system as shown in Figure 1, it comprise an image sensing module 10, a sharpness computation module 11, a microprocessor 12 (Micro Controller Unit, MCU), a step motor 13 and a focus lens 14.The image that this image sensing module 10 is taken by these camera lens 14 induction desires, this display module 15 is used to show the image that photographs.When image change, 11 pairs of images that photograph of this sharpness computation module carry out the calculating of sharpness, and this result of calculation is sent to this microprocessor 12, this microprocessor 12 is the value of each time sharpness relatively, calculate the number of turns that this step motor 13 rotates according to a predetermined algorithm, and then the mobile forward or backward distance of controls lens 14, so that focus lens 14 is in best focusing position.
Yet, when 12 pairs of step motor of this microprocessor are controlled, be to adopt its I/O mouth output pulse signal to give step motor, rotate with CD-ROM drive motor.When needing this step motor of control to rotate according to this microprocessor 12 of default algorithm, this microprocessor 12 need carry out real-time operation, and the generation pulse signal carries out Real Time Drive to this step motor 13, can't tell more resources and carry out other operation, thereby cause the resource utilization of this microprocessor 12 low.For the operation to other is controlled, need to adopt high performance microprocessor, increased the cost of this system.
[summary of the invention]
For overcoming camera head autofocus system cost problem of higher in the prior art, be necessary to provide a kind of microprocessor resources utilization factor high autofocus system.
A kind of autofocus system comprises: an image sensing module is used to respond to the image that desire is taken; One sharpness computation module is used for the sharpness of computed image; One step motor is used to control moving of focus lens; One microprocessor is used for the sharpness of image is compared, and controls this step motor rotation to send steering order; With a motor driven engine, be used to receive the instruction of this microprocessor, and drive this step motor and should instruct rotation mutually.
Compared with prior art, the autofocus system that installs mutually of taking the photograph of the present invention adopts the motor driven engine that the distance that step motor moves is controlled, and need not directly motor be driven by microprocessor, the utilization rate of microprocessor when having reduced the focusing operation, thereby the microprocessor that make to adopt lower cost can be carried out other operation of autozoom and system, improve the resource utilization of microprocessor, reduced system cost.
[description of drawings]
Fig. 1 is the synoptic diagram of the camera head autofocus system of prior art.
Fig. 2 is the synoptic diagram of camera head autofocus system of the present invention.
[embodiment]
Fig. 2 is the synoptic diagram of the camera head autofocus system of embodiment of the present invention.This camera head comprises an image sensing module 20, an analog-digital converter (Analog to DigitalConverter, ADC) 21, one sharpness computation module 22, a microprocessor 23, a motor driven engine 24, a step motor 25 and a camera lens 26.This analog-digital converter 21, this sharpness computation module 22, this microprocessor 23 and this motor driven engine are integrated in the chip 30.
This image sensing module 20 is used to respond to the image that desire is taken, and then be converted into CVBS (the Composite Video Band Signal that is used to show, composite video baseband signal) picture signal, this display module 27 receives this CVBS picture signal, and display image.Simultaneously, this CVBS picture signal is transmitted to this analog-digital converter 21, and this analog-digital converter 21 is converted into digital signal with this CVBS picture signal.This sharpness computation module 22 is isolated line synchronizing signal and field sync signal from this numeral CVBS picture signal, simultaneously the sharpness of computed image.
When picture changes, this sharpness computation module 22 is according to every sharpness of calculating an image of this field sync signal, and send result of calculation to this microprocessor 23, this microprocessor 23 goes out these step motor 25 next step needs according to a default algorithm computation and how to rotate, and sends an instruction to motor driven engine 24 according to result of calculation.This motor driven engine 24 comprises a pulse producer (figure does not show) and a counter (figure does not show), and this pulse producer can produce a series of pulses, and this step motor 25 of a series of pulse may command of this of one-period rotates a circle.This counter is used to control the time that this pulse signal continues, thereby controls the number of turns that this step motor 25 rotates.This camera lens 26 is controlled by this step motor 25 to move corresponding distance, and so the sharpness of repeated calculation image and mobile this camera lens 26 arrive best focusing position up to this camera lens 26.
Compared with prior art, the autofocus system that installs mutually of taking the photograph of the present invention adopts motor to drive Engine is controlled the movement of stepper motor, comes motor and need not adopt microprocessor to produce pulse Drive, having reduced the focusing operation to the utilization rate of microprocessor, thereby so that microprocessor can hold More other the operations of row have improved the resource utilization of microprocessor, thereby can adopt performance lower Microprocessor, reduced the cost of this autofocus system. Simultaneously, this sharpness computation module is carried Got field sync signal, can choose accurately according to this field sync signal one picture signal, be used for More accurate during definition judgment, thus so that focusing is more accurate.
In addition, those skilled in the art also can do other variation in spirit of the present invention. These are according to this The variation that invention spirit is done all should be included in the present invention's range required for protection.
Claims (5)
1. autofocus system comprises:
One image sensing module is used to respond to the image that desire is taken;
One sharpness computation module is used for the sharpness of computed image;
One microprocessor is connected with this sharpness computation module, is used for the sharpness of image is compared, and sends steering order and control this step motor rotation;
One step motor is used to control moving of focus lens,
It is characterized in that: further comprise a motor driven engine, be connected between this microprocessor and this step motor, be used to receive the instruction of this microprocessor, rotate corresponding to the instruction of microprocessor to drive this step motor.
2. autofocus system according to claim 1, it is characterized in that: further comprise an analog-digital converter, be connected between this image sensing module and this sharpness computation module, the simulation CVBS conversion of signals that is used for this image sensing module is transmitted is digital CVBS signal.
3. autofocus system according to claim 2 is characterized in that: this sharpness computation module can extract field sync signal from this numeral CVBS signal, and according to every sharpness of calculating an image of this field sync signal.
4. autofocus system according to claim 3, it is characterized in that: this motor driven engine further comprises a pulse producer and a counter, this pulse producer is used for producing this step motor of driving and rotates the needed pulse signal of one-period, and this register is used to control the time that this pulse signal continues.
5. autofocus system according to claim 4 is characterized in that: this analog-digital converter, this sharpness computation module, this microprocessor and this motor driven engine are integrated among the chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100750883A CN101329492A (en) | 2007-06-20 | 2007-06-20 | Automatic focusing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100750883A CN101329492A (en) | 2007-06-20 | 2007-06-20 | Automatic focusing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101329492A true CN101329492A (en) | 2008-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100750883A Pending CN101329492A (en) | 2007-06-20 | 2007-06-20 | Automatic focusing system |
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| CN (1) | CN101329492A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323928A (en) * | 2012-03-19 | 2013-09-25 | 华晶科技股份有限公司 | Shooting device and camera lens actuating device and method thereof |
| CN103379271A (en) * | 2012-04-18 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Auxiliary focusing device and auxiliary focusing method |
| CN103543574A (en) * | 2013-10-23 | 2014-01-29 | 翔德电子科技(深圳)有限公司 | Focusing and fine-adjusting method and system for variable-focal-length optical lens |
| CN104469169A (en) * | 2014-12-29 | 2015-03-25 | 信利光电股份有限公司 | Phase ranging camera shooting module and automatic focusing method thereof |
| CN105516603A (en) * | 2016-01-14 | 2016-04-20 | 极连电子科技(厦门)有限公司 | Automatic focusing image shooting system and automatic focusing method thereof |
| WO2017045308A1 (en) * | 2015-09-17 | 2017-03-23 | 小米科技有限责任公司 | Method, device and apparatus for controlling positioning of camera apparatus |
| CN113747042A (en) * | 2020-05-29 | 2021-12-03 | 杭州海康威视数字技术股份有限公司 | Stepping step length control method and method for determining stepping step length of stepping motor |
-
2007
- 2007-06-20 CN CNA2007100750883A patent/CN101329492A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323928A (en) * | 2012-03-19 | 2013-09-25 | 华晶科技股份有限公司 | Shooting device and camera lens actuating device and method thereof |
| CN103323928B (en) * | 2012-03-19 | 2015-09-09 | 华晶科技股份有限公司 | Camera head and lens actuating device thereof and camera lens actuating method |
| CN103379271A (en) * | 2012-04-18 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Auxiliary focusing device and auxiliary focusing method |
| CN103543574A (en) * | 2013-10-23 | 2014-01-29 | 翔德电子科技(深圳)有限公司 | Focusing and fine-adjusting method and system for variable-focal-length optical lens |
| CN104469169A (en) * | 2014-12-29 | 2015-03-25 | 信利光电股份有限公司 | Phase ranging camera shooting module and automatic focusing method thereof |
| WO2017045308A1 (en) * | 2015-09-17 | 2017-03-23 | 小米科技有限责任公司 | Method, device and apparatus for controlling positioning of camera apparatus |
| CN105516603A (en) * | 2016-01-14 | 2016-04-20 | 极连电子科技(厦门)有限公司 | Automatic focusing image shooting system and automatic focusing method thereof |
| CN113747042A (en) * | 2020-05-29 | 2021-12-03 | 杭州海康威视数字技术股份有限公司 | Stepping step length control method and method for determining stepping step length of stepping motor |
| CN113747042B (en) * | 2020-05-29 | 2022-11-04 | 杭州海康威视数字技术股份有限公司 | Stepping step length control method and method for determining stepping step length of stepping motor |
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| DD01 | Delivery of document by public notice |
Addressee: Qu Chong Document name: Notification of Patent Invention Entering into Substantive Examination Stage |
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| DD01 | Delivery of document by public notice |
Addressee: Shenzhen Feite Digital Technology Co., Ltd. Document name: the First Notification of an Office Action |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081224 |