CN100367105C - Tracking focusing method for digital camera - Google Patents
Tracking focusing method for digital camera Download PDFInfo
- Publication number
- CN100367105C CN100367105C CNB2003101244236A CN200310124423A CN100367105C CN 100367105 C CN100367105 C CN 100367105C CN B2003101244236 A CNB2003101244236 A CN B2003101244236A CN 200310124423 A CN200310124423 A CN 200310124423A CN 100367105 C CN100367105 C CN 100367105C
- Authority
- CN
- China
- Prior art keywords
- focus
- zoom lens
- estimate
- cpu
- lens group
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Automatic Focus Adjustment (AREA)
Abstract
The present invention relates to a tracking focusing method for a digital camera. After the digital camera is started and is focused firstly in a closing mode, the method comprises a tracking stage, an intermission stage and a reconfirmation stage. The data value of original video which is retrieved by a CCD is computed, and a zoom lens is regulated following the requirement of video to accurately move a new focusing position. When the zoom lens is focused every time, the zoom lens can not scan in the global range and can not scan back and forth, and the bad result that the video is repeatedly appeared from fuzzy to clear in the process of focusing when the video is taken by the camera every time can not appear without the assistance of the distance measuring module of infrared rays so that a hardware mechanism, etc. can be omitted. The present invention has the advantages that the volume and the weight of the digital camera are reduced, cost is saved, and the power consumption is reduced.
Description
Technical field
The present invention is relevant digital camera, the focusing method of especially relevant digital camera.
Background technology
This formula video camera of class and present digital camera mostly were provided with as hardware configurations such as infrared distance measuring modules in the past, and recording the object distance of object, and the assisted tomography machine is adjusted focal length, to realize the function of instant focusing.But in the video camera body,, can increase the volume of video camera, and can increase expending of power supply, and increase cost again in conjunction with the hardware configuration of a range finding module.
The applicant once obtained the Taiwan patent of multinomial relevant digital camera, for example announced No. 554228, disclosed a kind of automatic focusing method, was applicable to digital camera.The method is to choose a plurality of focusings zone in the time of single frame update; Calculate evaluation of estimate corresponding to above-mentioned focusing zone; Evaluation of estimate is given homogenization to time domain and spatial domain, and go out the object distance distribution according to the prediction of result after this homogenization; The focusing direction is judged in distribution according to object distance, and calculates the driving distance according to the difference of above-mentioned evaluation of estimate; According to focusing direction and the zoom lens that drives in the distance driving video search device.The method can judge in the time of single frame update and close burnt direction, with effective saving spent time of focusing automatically.
And for example announce No. 466377 (corresponding to the open CN13803030A of Chinese patent), disclose a kind of method for correcting drive gap of camera.Be that camera lens is focused to the right automatically from left end under fixed environment, reverse again by right-hand member focusing automatically left, calculate the evaluation of estimate of image data that CCD retrieves, read the evaluation of estimate curvilinear motion after, the variation of two groups of evaluation of estimate curves of comparison can define the reverse difference value of gear clearance; Make camera lens left according to same procedure again, reverse again, go out the forward difference value of gear clearance by two groups of evaluation of estimate curve definitions by left end focusing automatically to the right from right-hand member; When making motor operation, reverse again after increasing operation this reverse difference value or forward difference value and do not list counting in according to the zoom lens direct of travel, waiting to reverse increases this reverse difference value of operation or forward difference value behind the inverted running earlier and does not list counting in, can eliminate the error that gear clearance causes.
For improve general digital camera must in adorn a range finding module, and the disappearance that the volume of deriving is big, cost is high, the patented technology that the inventor has got permission in conjunction with the applicant, and add the technology of innovation and propose the present invention.
Summary of the invention
Fundamental purpose of the present invention provides a kind of digital camera tracing type focusing method, can reduce the consumption of video camera requisite space, weight reduction, saving cost and conservation of power.
A kind of digital camera tracing type of the inventive method focusing method comprises the steps:
(1) CPU controlling and driving motor scans zoom lens group automatically, and utilizes the image data value of video search unit retrieval to calculate evaluation of estimate, confirming closing focus, and controls this CD-ROM drive motor and drives this zoom lens group is closed focus to this position;
Whether (2) this CPU control makes this zoom lens group intermittently, change but still detect the image data of retrieving this video search unit at any time, if change expression image does not change, then continues detection; If this image has change, then enter next step;
(3) whether this CPU calculates this evaluation of estimate of closing focus and changes according to the image data of this video search unit retrieval, if no change, the expression object distance does not change, and then gets back to step (2); If this object distance changes, then enter next step;
(4) this CPU control this CD-ROM drive motor make this zoom lens group scan this close focus itself and before and after more at least, and calculate new evaluation of estimate; Make this CPU with this close focus itself and before and after more at least new evaluation of estimate size sequence, judge scan before carrying out or after scan, if scan before need carrying out, then enter step (5) if scan after need carrying out and then enter step (6);
(5) this CPU controls and scans before this CD-ROM drive motor is carried out this zoom lens group, and utilizes the image data of this video search unit retrieval to calculate evaluation of estimate, confirming the new focus of closing, and controls this CD-ROM drive motor and drives this lens group to this new position of closing focus; Afterwards, enter step (7);
(6) this CPU controls and scans after this CD-ROM drive motor is carried out this zoom lens group, and utilizes the image data of this video search unit retrieval to calculate evaluation of estimate, confirming the new focus of closing, and controls this CD-ROM drive motor and drives this lens group to this new position of closing focus; Afterwards, enter step (7);
(7) whether this CPU detects to receive and stops the instruction of focusing automatically, if do not receive this instruction, then gets back to step (2); If receive this instruction, then finish to scan automatically work.
Described method, wherein whether this CPU is changed by the brightness value and the evaluation of estimate that detect the image data of retrieving the video search unit, confirms whether image changes.
Described method, wherein this video search unit is CCD.
Described method, wherein the numerical value of " more at least " in this step (4) is 2 points.
Description of drawings
Fig. 1 is the method flow diagram of digital camera tracing type focusing of the present invention;
Fig. 2 closes the synoptic diagram that concerns of focus and evaluation of estimate for digital camera;
Fig. 3 is near former several the new evaluation of estimate synoptic diagram of focus that close;
Fig. 4 is the former synoptic diagram that closes near the another kind of sample attitudes of several new evaluations of estimate of focus.
Embodiment
Lens group, lens group CD-ROM drive motor, video search unit and CPU hardware structures such as (CPU (central processing unit)) that the present invention mainly utilizes general digital camera itself to have.This video search unit can be general CCD (electric coupling apparatus).In the raw video data value that CCD retrieved, after the CPU separation algorithm, utilize No. 554228 announcement technology of above-mentioned Taiwan patent announcement, obtain the coke number that closes of zones of different.This closes the relative articulation that coke number can be represented object.In that digital camera is each when taking an image frame, can utilize zoom lens motionless zoom lens whole process to scan and scan mode back and forth, find the best to close coke number, such as in No. 466377 patent of above-mentioned Taiwan patent announcement announcement.But in digital camera, at the picked-up image,, seek the best and close coke number, then can make the image repetitiousness of recording ill effect fuzzy, clear, fuzzy, clear variation occur if each all zoom lens motionless zoom lens scan and scan back and forth mode with whole process because of at any time.The present invention utilizes the back depth of field principle profound than prospect, make the digital camera start and close defocused first, adopt and follow the trail of, intermittently reach and confirm three phases again, calculate the raw video data value that CCD retrieved, at any time optionally adjust zoom lens, move to the new burnt position of closing with correct direction.Can when each focusing, all not make zoom lens carry out whole process and scan and scan back and forth, and the image that makes the video camera picked-up is in each focus process, the image repetitiousness is occurred by fuzzy to bad result clearly.
See also shown in Figure 1.Digital camera tracing type focusing method of the present invention comprises the steps:
(1) CPU controlling and driving motor scans zoom lens group automatically, and utilizes the image data value of CCD retrieval to calculate evaluation of estimate, confirming closing focus, and controls this CD-ROM drive motor and drives this zoom lens group is closed focus to this position;
(2) this CPU control makes this zoom lens group intermittently, but still whether the image data that detects this CCD retrieval at any time change, if change expression image does not change, then continues to detect; If this image has change, then enter next step;
(3) whether this CPU calculates this evaluation of estimate of closing focus and changes according to the image data of this CCD retrieval, if no change, the expression object distance does not change, and then gets back to step (2); If this object distance changes, then enter next step;
(4) this CPU control this CD-ROM drive motor make this zoom lens group scan this close focus itself and before and after a bit or a bit above (preferably 2 points), and calculate new evaluation of estimate; Make this CPU with this close focus itself and before and after a bit or the new evaluation of estimate size sequence of a bit above (preferably 2 points), judge scan before carrying out or after scan, if scan before need carrying out, then enter step (5), then enter step (6) if scan after need carrying out;
(5) this CPU controls and scans before this CD-ROM drive motor is carried out this zoom lens group, and utilizes the image data of this CCD retrieval to calculate evaluation of estimate, confirming the new focus of closing, and controls this CD-ROM drive motor and drives this lens group to this new position of closing focus; Afterwards, enter step (7);
(6) this CPU controls and scans after this CD-ROM drive motor is carried out this zoom lens group, and utilizes the image data of this CCD retrieval to calculate evaluation of estimate, confirming the new focus of closing, and controls this CD-ROM drive motor and drives this lens group to this new position of closing focus; Afterwards, enter step (7);
(7) whether this CPU detects to receive and stops the instruction of focusing automatically, if do not receive this instruction, then gets back to step (2); If receive this instruction, then finish automatic focusing work.
In the abovementioned steps (1), the zoom lens that CPU calculates in each position corresponding to the relation of the evaluation of estimate of focusing, as shown in Figure 2.Show among the figure that zoom lens group has higher evaluation of estimate when the position that A is ordered, promptly this A point is and closes focus.
In the abovementioned steps (2), CPU is whether brightness value and the evaluation of estimate by the image data that detects the CCD retrieval changes, and confirms whether image changes.
In the abovementioned steps (5), CPU controlling and driving motor makes zoom lens group scan this and closes focus itself and front and back 2 points, and calculate former close focus A itself and before and after 2 new evaluations of estimate, by its big or small Rankine-Hugoniot relations, if as shown in Figure 3 situation, decidable is new, and to close focus be to close the place ahead that focus A is ordered former; If as shown in Figure 4 situation, decidable is new, and to close focus be to close the rear that focus A is ordered former.Zoom lens group is scanned toward the place ahead or toward the rear by the former focus of closing, recomputate evaluation, confirm the new focus of closing, carry out new Jiao that closes.
The present invention makes the object distance of the captured image of digital camera produce when change at every turn, is that benchmark is judged to scan forward and closed Jiao with original focus of closing all, or scans backward and close Jiao, can find the new focus of closing fast.The image of its picked-up is to clear by fuzzy.And do not need as existing mode, need carry out the omnidistance focusing that scans and scan back and forth, make image produce steamed bun stick with paste, clear, fuzzy, repeat variation clearly.
The present invention need not utilize auxiliary as the infrared distance measuring module again, so can omit these hardware mechanisms, can reduce volume, the weight reduction of digital camera and save cost, and can reduce power consumption.
The above record only for utilizing the embodiment of the technology of the present invention content, anyly is familiar with modification, the variation that this skill person uses the present invention to do, and all belongs to the claim that the present invention advocates, and is not limited to the content that embodiment discloses.
Claims (4)
1. a digital camera tracing type focusing method is characterized in that, comprises the steps:
(1) CPU controlling and driving motor scans zoom lens group automatically, and utilizes the image data value of video search unit retrieval to calculate evaluation of estimate, confirming closing focus, and controls this CD-ROM drive motor and drives this zoom lens group is closed focus to this position;
Whether (2) this CPU control makes this zoom lens group intermittently, change but still detect the image data of retrieving this video search unit at any time, if change expression image does not change, then continues detection; If this image has change, then enter next step;
(3) whether this CPU calculates this evaluation of estimate of closing focus and changes according to the image data of this video search unit retrieval, if no change, the expression object distance does not change, and then gets back to step (2); If this object distance changes, then enter next step;
(4) this CPU control this CD-ROM drive motor make this zoom lens group scan this close focus itself and before and after more at least, and calculate new evaluation of estimate; Make this CPU with this close focus itself and before and after more at least new evaluation of estimate size sequence, judge scan before carrying out or after scan, if scan before need carrying out, then enter step (5) if scan after need carrying out and then enter step (6);
(5) this CPU controls and scans before this CD-ROM drive motor is carried out this zoom lens group, and utilizes the image data of this video search unit retrieval to calculate evaluation of estimate, confirming the new focus of closing, and controls this CD-ROM drive motor and drives this lens group to this new position of closing focus; Afterwards, enter step (7);
(6) this CPU controls and scans after this CD-ROM drive motor is carried out this zoom lens group, and utilizes the image data of this video search unit retrieval to calculate evaluation of estimate, confirming the new focus of closing, and controls this CD-ROM drive motor and drives this lens group to this new position of closing focus; Afterwards, enter step (7);
(7) whether this CPU detects to receive and stops the instruction of focusing automatically, if do not receive this instruction, then gets back to step (2); If receive this instruction, then finish to scan automatically work.
2. the method for claim 1 is characterized in that, wherein whether this CPU is changed by the brightness value and the evaluation of estimate that detect the image data of retrieving the video search unit, confirms whether image changes.
3. the method for claim 1 is characterized in that, wherein this video search unit is CCD.
4. the method for claim 1 is characterized in that, wherein the numerical value of " more at least " in this step (4) is 2 points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101244236A CN100367105C (en) | 2003-12-24 | 2003-12-24 | Tracking focusing method for digital camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101244236A CN100367105C (en) | 2003-12-24 | 2003-12-24 | Tracking focusing method for digital camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1632689A CN1632689A (en) | 2005-06-29 |
| CN100367105C true CN100367105C (en) | 2008-02-06 |
Family
ID=34845007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101244236A Expired - Fee Related CN100367105C (en) | 2003-12-24 | 2003-12-24 | Tracking focusing method for digital camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100367105C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101430477B (en) * | 2007-11-09 | 2011-06-08 | 鸿富锦精密工业（深圳）有限公司 | Method for judging object distance |
| JP4780205B2 (en) * | 2009-02-23 | 2011-09-28 | カシオ計算機株式会社 | Imaging device, angle of view adjustment method, and program |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270763A (en) * | 1991-06-24 | 1993-12-14 | Nikon Corporation | Auto-focusing device |
| JP2002014276A (en) * | 2000-06-29 | 2002-01-18 | Tamron Co Ltd | Camera with focal information display device |
| JP2002228913A (en) * | 2001-01-30 | 2002-08-14 | Sanyo Electric Co Ltd | Lens device |
| CN1417634A (en) * | 2001-10-31 | 2003-05-14 | 金宝电子工业股份有限公司 | Automatic focusing method of camera |
| CN1452004A (en) * | 2002-04-17 | 2003-10-29 | 株式会社尼康 | Camera |
-
2003
- 2003-12-24 CN CNB2003101244236A patent/CN100367105C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270763A (en) * | 1991-06-24 | 1993-12-14 | Nikon Corporation | Auto-focusing device |
| JP2002014276A (en) * | 2000-06-29 | 2002-01-18 | Tamron Co Ltd | Camera with focal information display device |
| JP2002228913A (en) * | 2001-01-30 | 2002-08-14 | Sanyo Electric Co Ltd | Lens device |
| CN1417634A (en) * | 2001-10-31 | 2003-05-14 | 金宝电子工业股份有限公司 | Automatic focusing method of camera |
| CN1452004A (en) * | 2002-04-17 | 2003-10-29 | 株式会社尼康 | Camera |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1632689A (en) | 2005-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107529011B (en) | A kind of motorized zoom lens control method | |
| CN102819168B (en) | Picture pick-up device and control method, lens unit and control method thereof | |
| CN101247477B (en) | Image-pickup apparatus and control method thereof | |
| JP4863955B2 (en) | Automatic focus adjustment device | |
| CN101582987B (en) | Image capture device | |
| US5404013A (en) | Infrared imaging system having an automatic focusing control | |
| US20140036113A1 (en) | System And Method For Creating Composite Images By Utilizing An Imaging Device | |
| CN108156371B (en) | Infrared automatic focusing fast searching method | |
| CN103856717B (en) | Camera focusing control method and device | |
| CN101241223B (en) | Automatic focusing process | |
| CN104102068B (en) | Atomatic focusing method and automatic focusing mechanism | |
| CN102104733B (en) | Image pickup apparatus and control method for image pickup apparatus | |
| CN102419505B (en) | Automatic focusing method and system and integrated camera | |
| CN106303242A (en) | The focusing system quickly of muti-spectrum imaging and method | |
| CN106019550B (en) | Dynamic focusing device and focusing tracking for the micro- scanning of high speed | |
| CN102724399A (en) | Automatic setting of zoom, aperture and shutter speed based on scene depth map | |
| CN102282836A (en) | Display control device, method of control of display, and program | |
| CN109769096A (en) | A kind of servo control method for linear array CCD scanning process | |
| CN103945133A (en) | Auto-focus device and method for visible light lens | |
| CN102023460B (en) | Quick focusing method for digital camera | |
| CN101135828A (en) | Focus adjustment apparatus, image pickup apparatus, and control method | |
| CN100367105C (en) | Tracking focusing method for digital camera | |
| CN103529544A (en) | Nano membrane thickness measuring instrument capable of automatically positioning and focusing | |
| CN109995982B (en) | Method and device for automatically focusing electric lens and camera | |
| CN104002020B (en) | Digital camera autofocus system based on welding pool and auto focusing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20151224 |
|
| EXPY | Termination of patent right or utility model |