CN101873438B - Slow shutter speed control device of camera and method thereof - Google Patents

Slow shutter speed control device of camera and method thereof Download PDF

Info

Publication number
CN101873438B
CN101873438B CN2009100500020A CN200910050002A CN101873438B CN 101873438 B CN101873438 B CN 101873438B CN 2009100500020 A CN2009100500020 A CN 2009100500020A CN 200910050002 A CN200910050002 A CN 200910050002A CN 101873438 B CN101873438 B CN 101873438B
Authority
CN
China
Prior art keywords
shutter speed
slow shutter
above
mentioned
speed control
Prior art date
Application number
CN2009100500020A
Other languages
Chinese (zh)
Other versions
CN101873438A (en
Inventor
闵喆
金万盛
Original Assignee
上海乐金广电电子有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海乐金广电电子有限公司 filed Critical 上海乐金广电电子有限公司
Priority to CN2009100500020A priority Critical patent/CN101873438B/en
Publication of CN101873438A publication Critical patent/CN101873438A/en
Application granted granted Critical
Publication of CN101873438B publication Critical patent/CN101873438B/en

Links

Abstract

The invention discloses a slow shutter speed control device of a camera and a method thereof. In the invention, when the camera for shooting a moving image shoots a shot low-luminance object by virtue of imaging elements such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) and the like, a slow shutter speed control mode and the reset pulse of the variable output imaging elements can be automatically set, and linear transformation is executed from the current shutter speed to the target slow shutter speed, thus slow shutter speed control action can be implemented and the moving image can be naturally shot.

Description

The slow shutter speed control device and the method for video camera

Technical field

The present invention relates to a kind of slow shutter speed control device and method (Apparatus andmethod for controlling slow shutter speed of camera) of video camera; Especially, utilize charge coupled device (CCD) or complementary metal oxide semiconductors (CMOS) image-forming components such as (CMOS:Complementary MetalOxide Semiconductor) to take slow shutter speed (SlowShutter Speed) control device and the method for the video camera of moving image.

Background technology

Usually; The video camera of taking moving image be widely used charge coupled device (CCD) or complementary metal oxide semiconductors (CMOS) image-forming components (Photographing Device) such as (CMOS); For example, above-mentioned video camera is when taking the subject of high brightness levels, for minimizing is incident upon the light on the above-mentioned image-forming component; Perhaps reduce the opening of aperture (IRIS) automatically, perhaps automatically reduce analog gain (Gain) value of the output signal that is used to amplify above-mentioned image-forming component.

In addition; Above-mentioned video camera is reducing under the state of said aperture opening and analog-gain value automatically; Still in the time of can't taking the subject of appropriate intensity level; For reducing, will be adjusted to short (Short) shutter speed to the shutter speed of above-mentioned image-forming component (Shutter Speed) by electric charge (Charge) amount of each pixel (Pixel) of above-mentioned image-forming component charging.

Simultaneously; Above-mentioned video camera is when taking the subject of low luminance level; For increase is incident upon the light on the above-mentioned image-forming component, perhaps increase the opening of aperture (IRIS) automatically, perhaps automatically increase analog gain (Gain) value of the output signal that is used to amplify above-mentioned image-forming component.

And; Above-mentioned video camera is increasing under the state of said aperture opening and analog-gain value automatically; Still in the time of can't taking the subject of appropriate intensity level; For increasing, will regulate (Long) shutter speed of growing up to the shutter speed of above-mentioned image-forming component (Shutter Speed), promptly slow shutter speed (Slow Shutter Speed) by electric charge (Charge) amount of each pixel (Pixel) of above-mentioned image-forming component charging.

Therefore; Above-mentioned video camera is when the subject of the subject of taking high brightness levels or low luminance level; To regulate aperture opening and analog-gain value and shutter speed automatically, so that can carry out the shooting action of the subject of appropriate level (level).

But; If common camera is set low-light level (Low illuminance) screening-mode that is used to take above-mentioned low luminance level subject; For example, the shutter speed of 1 field duration (field period) is adjusted to slow (Slow) shutter speeds of 2 field duration or 3 field duration, as shown in Figure 1; When moment carries out from the shutter speed of 1 field duration and during to the switching motion of the shutter speed of 2 field duration, the factitious problem of captured image can occur.

Summary of the invention

The present invention develops for addressing the above problem just; Purpose is to provide a kind of video camera of taking moving image utilizing charge coupled device (CCD) or complementary metal oxide semiconductors (CMOS) image-forming components such as (CMOS); When taking low-light level (Low Luminance) subject; With the slow shutter speed of automatic setting (Slow Shutter Speed) control model; The reset pulse of variable output image-forming component (Reset Pulse) is carried out from slow shutter speed control device and the method for current shutter speed to the video camera of linearity (Linear) conversion of the slow shutter speed of target.

For realizing above-mentioned purpose, the slow shutter speed control method of video camera of the present invention comprises following two steps: the 1st step.When taking the low-light level subject, the slow shutter speed control model of automatic setting; The 2nd step.Execution is from linearity (Linear) conversion of current shutter speed to the slow shutter speed of target.

The slow shutter speed control method of video camera of the present invention, wherein, above-mentioned the 2nd step also comprises two steps: if set above-mentioned slow shutter speed control model, then calculate the difference between the slow shutter speed of current shutter speed and target; After the charging reset pulse number of calculating and above-mentioned difference respective imaging element, by the number output charging reset pulse littler 1 than the number of this calculating.

The slow shutter speed control method of video camera of the present invention, wherein, the charging reset pulse number of above-mentioned image-forming component is to contrast current shutter speed and the difference between the slow shutter speed of target.

A kind of slow shutter speed control device of video camera, comprise following three parts: drive unit is used to drive image-forming component; Checkout gear is used to detect low-light level subject shooting state; Control device.When taking above-mentioned low-light level subject, after the slow shutter speed control model of automatic setting, for carrying out, and control above-mentioned drive unit from of linearity (Linear) conversion of current shutter speed to the slow shutter speed of target.

The slow shutter speed control device of video camera of the present invention; Wherein, If above-mentioned control device is set above-mentioned slow shutter speed control model, then calculate the difference between the slow shutter speed of current shutter speed and target, calculate charging reset pulse number with above-mentioned difference respective imaging element; Be the reset pulse that charges by the number output littler 1 then, and control above-mentioned drive unit than the number of this calculating.

The slow shutter speed control device of video camera of the present invention, wherein, the charging reset pulse number of above-mentioned image-forming component is to contrast current shutter speed and the difference between the slow shutter speed of target.

In the slow shutter speed control device and method of video camera of the present invention; The video camera of taking moving image is utilizing charge coupled device (CCD) or complementary metal oxide semiconductors (CMOS) image-forming components such as (CMOS); When taking the low-light level subject; The slow shutter speed control model of automatic setting, the reset pulse of variable output image-forming component is carried out from linearity (Linear) conversion of current shutter speed to the slow shutter speed of target; Even thereby carry out slow shutter speed control action, also can take moving image naturally.

Description of drawings

Fig. 1 is the slow shutter speed control procedure embodiment sketch map of common camera;

Fig. 2 is that the video camera that the present invention is suitable for constitutes sketch map;

Fig. 3 is the slow shutter speed control method operational flowchart of video camera of the present invention;

Fig. 4 is the slow shutter speed control procedure embodiment sketch map of video camera of the present invention.

The symbol description of major part in the accompanying drawing:

10: zoom lens 11: focal length lens

12: aperture 13: image-forming component

14: AFE(analog front end) 15: Digital Signal Processing portion

16: driver 17: the timer clock generator

18: low-light level test section 19: memory

20: microcomputer

Embodiment

Slow shutter speed control device and method to video camera of the present invention is elaborated with reference to the accompanying drawings.

At first, slow shutter speed control device of the present invention and method are applicable to all kinds video camera that disposes the charge coupled device (CCD) that is widely used in moving filming image or monitoring camera (Monitoring Camera) of complementary metal oxide semiconductors (CMOS) image-forming components such as (CMOS) and so on.

Fig. 2 is that the video camera that the present invention is suitable for constitutes sketch map.For example, above-mentioned video camera comprises following part: zoom lens 10, focal length lens 11, aperture 12, image-forming component 13, AFE(analog front end) (AFE:Analog Front End) 14, Digital Signal Processing portion (DSP) 15, driver 16, timer clock generator 17, low-light level test section 18, memory 19, microcomputer 20 etc.

Simultaneously; Above-mentioned microcomputer 20 will be through control above-mentioned timer clock (Timing Clock) generator 17; Produce the timer clock (Timing Cluck) of assigned frequency; And above-mentioned driver 16 will utilize above-mentioned timer clock, and control is through the output timing of the electric charge (Charge) of pixel (Pixel) charging of above-mentioned image-forming component 13.

And; Above-mentioned AFE(analog front end) (front end) 14 will be carried out automatic gain control (the AGC:Auto Gain Control) work that is amplified to the analog signal from 13 outputs of above-mentioned image-forming component specified level, and the analog signal conversion that will be amplified to the afore mentioned rules level becomes the A/D switching motion of digital signal.

Above-mentioned Digital Signal Processing portion 15 will be to the digital signal from above-mentioned AFE(analog front end) conversion output; Utilize digital gain (Digital Gain) value to amplify, carry out the Digital Signal Processing action of AWB (AWB:Auto WhiteBalance) and so on then.

Simultaneously; Above-mentioned low-light level test section 18 will be analyzed the video data that carries out signal processing through above-mentioned Digital Signal Processing portion 15; Detection be the low-light level shooting state whether, for example, if because of taking the subject of low luminance level; And increase aperture opening; And increase under the state of analog-gain value, it is above that the mean flow rate of subject filmed image does not still reach the preset standard value, then will detect to needing low-light level (Low Luminance) shooting state of shutter speed adjustment.

And; If above-mentioned microcomputer 20 is according to the detection signal from above-mentioned low-light level test section 18 outputs; Be identified as the words of low-light level shooting state; Then the slow shutter speed of automatic setting (Slow Shutter Speed) control model is carried out from linearity (Linear) transfer process of current shutter speed to the slow shutter speed of target simultaneously.

Fig. 3 is the slow shutter speed control method operational flowchart of video camera of the present invention.If microcomputer 20 is set slow shutter speed control model according to user applies; Perhaps be identified as low-light level subject shooting state, then with the slow shutter speed control model of automatic setting (S10) according to detection signal from above-mentioned low-light level test section 18 outputs.

In addition; Above-mentioned microcomputer 20 is when confirming current shutter speed (S11); With the difference (S12) of calculating, for example, be the shutter speed of 1 field duration in current shutter speed with the slow shutter speed of target; And the slow shutter speed of target then will be calculated current shutter speed and the difference between the slow shutter speed of target by 1 when being the shutter speed of 2 field duration.

And; With the maximum reset pulse number (S13) of calculating with above-mentioned 1 respective imaging element; For example; As shown in Figure 4, suppose and be 5 that then above-mentioned microcomputer 20 is through controling above-mentioned driver 16 to the maximum reset pulse number that the electric charge that above-mentioned image-forming component 13 is recharged carries out the corresponding image-forming component of the required resolution of signal processing (Resolution) gradually between 1; From the shutter speed of 1 field duration to the 1st process of the shutter speed conversion of 2 field duration, export 4 reset pulses.

Promptly; From the shutter speed of 1 field duration to the 1st process of the shutter speed conversion of 2 field duration; Export 4 reset pulses, at the residue 1/5 of even number (even) field and the electric charge of odd number (odd) field interval output charging, export the shutter speed of 1.2 field duration then with this.

And, in the 2nd process, export 3 reset pulses, at the residue 2/5 of even number (even) field and the electric charge of next odd number (odd) field interval output charging, export the shutter speed of 1.4 field duration then with this.In the 3rd process, export 2 reset pulses, at the residue 3/5 of even number (even) field and the electric charge of next odd number (odd) field interval output charging, export the shutter speed of 1.6 field duration then with this.

In addition, in the 4th process, export 1 reset pulse, at the residue 4/5 of even number (even) field and the electric charge of next odd number (odd) field interval output charging, export the shutter speed of 1.8 field duration then with this.In the 5th process, do not export reset pulse, thereby export the electric charge of whole even numbers (even) field and the charging of next odd number (odd) field interval, carry out the slow shutter speed action of linearity (Linear) (S15) of the shutter speed that reached for 2.0 field duration.

And, during carrying out said process, will discern whether reach the slow shutter speed of target; For example, when the slow shutter speed of miss the mark still (S16), as stated; The reset pulse number that will be carried in image-forming component on one side reduces by 1 (S17), on one side the linear slow shutter speed action of execution.

Simultaneously; If above-mentioned microcomputer 20 reaches the slow shutter speed of target; Then no longer reset pulse is further outputed on the above-mentioned image-forming component; To remove slow shutter speed control model (S18) simultaneously, even thereby carry out slow shutter speed control action, also can take moving image naturally.

The aforesaid preferred embodiment of the present invention puts forward from the illustration purpose; In related work personnel the claim item is put down in writing fully below the technological thought of the present invention and technical scope thereof, other various embodiment are improved, change, substitute or additional etc.

Claims (4)

1. the slow shutter speed control method of a video camera is characterized in that: comprise following two steps:
The 1st step, when taking the low-light level subject, the slow shutter speed control model of automatic setting;
The 2nd step is carried out from linearity (Linear) conversion of current shutter speed to the slow shutter speed of target, comprising:
If set above-mentioned slow shutter speed control model, calculate the difference between current shutter speed and the slow shutter speed of target;
After the charging reset pulse number of calculating and above-mentioned difference respective imaging element, by the number output charging reset pulse littler 1 than the number of this calculating.
2. the slow shutter speed control method of video camera as claimed in claim 1 is characterized in that: the charging reset pulse number of above-mentioned image-forming component is current shutter speed of contrast and the difference between the slow shutter speed of target.
3. the slow shutter speed control device of a video camera is characterized in that: comprise following three parts:
Drive unit is used to drive image-forming component;
Checkout gear is used to detect low-light level subject shooting state;
Control device; When taking above-mentioned low-light level subject, after the slow shutter speed control model of automatic setting, for carrying out from of linearity (Linear) conversion of current shutter speed to the slow shutter speed of target; And control above-mentioned drive unit; If wherein above-mentioned control device is set above-mentioned slow shutter speed control model, then calculate the difference between the slow shutter speed of current shutter speed and target, calculate charging reset pulse number with above-mentioned difference respective imaging element; Be the reset pulse that charges by the number output littler 1 then, and control above-mentioned drive unit than the number of this calculating.
4. the slow shutter speed control device of video camera as claimed in claim 3 is characterized in that: the charging reset pulse number of above-mentioned image-forming component is according to current shutter speed and the difference between the slow shutter speed of target.
CN2009100500020A 2009-04-24 2009-04-24 Slow shutter speed control device of camera and method thereof CN101873438B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009100500020A CN101873438B (en) 2009-04-24 2009-04-24 Slow shutter speed control device of camera and method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009100500020A CN101873438B (en) 2009-04-24 2009-04-24 Slow shutter speed control device of camera and method thereof

Publications (2)

Publication Number Publication Date
CN101873438A CN101873438A (en) 2010-10-27
CN101873438B true CN101873438B (en) 2012-07-04

Family

ID=42998071

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009100500020A CN101873438B (en) 2009-04-24 2009-04-24 Slow shutter speed control device of camera and method thereof

Country Status (1)

Country Link
CN (1) CN101873438B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1603933A (en) * 2003-09-30 2005-04-06 乐金电子(中国)研究开发中心有限公司 Shutter speed control method for built-in camera of mobile communication terminal
CN1805505A (en) * 2005-01-12 2006-07-19 上海乐金广电电子有限公司 Method of managing digital slow-speed shutter mode of monitoring camera
CN101115145A (en) * 2006-07-25 2008-01-30 佳能株式会社 Image-pickup apparatus and focus control method for the same
EP1906658A2 (en) * 2006-09-29 2008-04-02 Canon Kabushiki Kaisha Image sensing apparatus and control method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1603933A (en) * 2003-09-30 2005-04-06 乐金电子(中国)研究开发中心有限公司 Shutter speed control method for built-in camera of mobile communication terminal
CN1805505A (en) * 2005-01-12 2006-07-19 上海乐金广电电子有限公司 Method of managing digital slow-speed shutter mode of monitoring camera
CN101115145A (en) * 2006-07-25 2008-01-30 佳能株式会社 Image-pickup apparatus and focus control method for the same
EP1906658A2 (en) * 2006-09-29 2008-04-02 Canon Kabushiki Kaisha Image sensing apparatus and control method

Also Published As

Publication number Publication date
CN101873438A (en) 2010-10-27

Similar Documents

Publication Publication Date Title
US9007489B2 (en) Method and apparatus for image background removal and replacement
EP2717560B1 (en) Multi-step exposed image acquisition method by electronic shutter and photographing apparatus using the same
CN101408709B (en) Image viewfinding device and automatic focusing method thereof
DE60308242T2 (en) Imaging device
JP4149528B2 (en) Automatic focus detection device
US7569868B2 (en) Image pickup device and image pickup system
US8081220B2 (en) Digital still camera and method of controlling image combination
JP2013024886A (en) Imaging apparatus
US7920175B2 (en) Electronic still camera performing composition of images and image capturing method therefor
US9667856B2 (en) Auto focus adjusting method, auto focus adjusting apparatus, and digital photographing apparatus including the same
CN100460916C (en) Lens device, image pickup device and image pickup system
EP1995950A1 (en) Imaging apparatus
JP2006005520A (en) Imaging apparatus
JP4837406B2 (en) Electronic blur correction apparatus and electronic blur correction method
JP5851070B2 (en) Interchangeable lens digital camera
TWI360349B (en) Digital imaging apparatus with camera shake compen
TWI423664B (en) Imaging apparatus and exposure control method
US9154685B2 (en) Driving technology of an image sensor in an image capture apparatus
EP0476907A2 (en) Solid-state imaging devices
JP2008271412A (en) Imaging unit and control method therefor, program, and recording medium
JP4542058B2 (en) Imaging apparatus and imaging method
US8022999B2 (en) Deviation detector, deviation corrector and imaging device
US20090002512A1 (en) Image pickup apparatus, image pickup method, and program thereof
US20040212723A1 (en) Image pickup apparatus and operating method
JP2006222935A (en) Electronic still camera, image capturing method, program and storage medium

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 201206 PUDONG NEW AREA, SHANGHAI TO: 516000 HUIZHOU, GUANGDONG PROVINCE

TR01 Transfer of patent right

Effective date of registration: 20141113

Address after: 516000 Guangdong city of Huizhou Province East Hui Wai Fung Taiwan Industrial Zone Road LG

Patentee after: LG Electronics (Huizhou) Co., Ltd.

Address before: 201206 Jinqiao Road, Pudong New Area Jinqiao Export Processing Zone, Shanghai, 600

Patentee before: Shanghai LG General Electronic Co., Ltd.

ASS Succession or assignment of patent right

Owner name: LG ELECTRONICS (HUIZHOU) CO., LTD.

Free format text: FORMER OWNER: SHANGHAI LG GENERAL ELECTRONIC CO., LTD.

Effective date: 20141113

C41 Transfer of patent application or patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120704

Termination date: 20180424

CF01 Termination of patent right due to non-payment of annual fee