CN100397243C - Magnification correcting method for camera - Google Patents
Magnification correcting method for camera Download PDFInfo
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- CN100397243C CN100397243C CNB011345055A CN01134505A CN100397243C CN 100397243 C CN100397243 C CN 100397243C CN B011345055 A CNB011345055 A CN B011345055A CN 01134505 A CN01134505 A CN 01134505A CN 100397243 C CN100397243 C CN 100397243C
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- zoom lens
- camera
- magnification
- image
- correcting method
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Abstract
The present invention relates to a magnification ratio correcting method for a camera. The method comprises the following steps: the camera is used for shooting the image of a corrective sample with a fixed direction, and the corrective sample contains a specific region; firstly, a zoom lens is moved to the rim, and the corrective sample is automatically focused; in the process of moving the zoom lens for increasing a magnification ratio, the image data of the corrective sample shot by a CCD (Charge Coupled Device) is read, the pixel point number of the image in the specific region contained in the CCD is calculated, and the number is compared with the pixel point number of an image in a specific region with a known magnification ratio. If the difference value of the pixel point numbers is within a range of allowable errors, then the position of the zoom lens at the time is recorded, namely the position a step motor and a voltage motor for reaching the magnification ratio needs driving the zoom lens to reach. The method of the present invention can be utilized to rapidly and correctly correct the magnification ratio of the camera.
Description
Technical field
The present invention is the bearing calibration of relevant amplifying ratio of camera, especially relevant can be automatically, the magnification of correcting camera fast.
Background technology
The automatic focusing mechanism of general digital camera or traditional optical camera is to drive motor (Pulsemotor) or voltage motor (Dcmotor) with the step to drive zoom lens and move to focusing position to obtain image clearly.In the time will obtaining the image of a certain magnification, to carry out the correction of amplifying ratio of camera earlier, can know just zoom lens need move to which position and obtain the image of this magnification that the position information of this zoom lens can be represented with the magnitude of voltage that the step that the drive zoom lens moves is driven revolution step number or voltage motor.
The bearing calibration of previous amplifying ratio of camera, it is the image that Figure 10 was proofreaied and correct in acquisition as shown in Figure 1 when zoom lens was moved to marginal end, adjust camera and the distance of proofreading and correct Figure 10, the housing 11 of the image of proofreading and correct Figure 10 just in time is positioned on the frame of image display screen, fixedly camera and the distance of proofreading and correct Figure 10; Controlling the step in mode manually drives motor or voltage motor and drives zoom lens and move, center 12 or the inside casing 13 of proofreading and correct Figure 10 just in time are positioned on the frame of image display screen, the record step is driven the rotation step number of motor or the magnitude of voltage of voltage motor, can confirm camera when a certain magnification, the step drives step number or the voltage motor that motor need rotate and needs zoom lens to be moved to the position that can obtain this magnification when a certain magnitude of voltage.Above-mentionedly carry out the correction work of amplifying ratio of camera in mode manually, quite time-consuming, and easily produce personal error, make the correction of magnification become inaccurate.Other has a kind of correcting mode that utilizes optical instrument to carry out amplifying ratio of camera, and the equipment of optical instrument need be arranged, and its cost is higher.Proofread and correct and need the problem of equipment and fund when utilizing optical instrument for solving amplifying ratio of camera, or utilize and proofread and correct more time-consuming manually and be easy to generate the problem of error, after the inventor studies again and again, finish the present invention eventually.
Summary of the invention
Fundamental purpose of the present invention is providing a kind of magnification correcting method for camera, can make things convenient for, save time and the magnification of correct correcting camera.
A kind of magnification correcting method for camera of the present invention is characterized in that it comprises the steps:
A. zoom lens motionless zoom lens captures the image of the calibration samples that comprises the specific region and carries out focusing; Wherein this specific region comprises and has the oblique line district in the bold box;
B. after reading the image data of this calibration samples that CCD captures, be as the criterion with brightness, to deceive, white two is divided into zero and one, laterally to read data, count in case read to the consecutive numbers stain then begin, promptly stop counting in case read to the consecutive numbers white point, to calculate the pixel number that comprises this specific region image in the CCD;
C. the count results of this being counted is decided to be the block area value, calculates this block area value and the difference that will proofread and correct the known block area value of magnification;
D. judge that this difference is whether among range of allowable error;
E. if this difference is in range of allowable error and proofreaies and correct successfully, then write down the position of zoom lens, otherwise begin correction program once more behind the zoom lens motionless zoom lens.
Wherein zoom lens motionless zoom lens is to increase magnification in this steps A.
Wherein the position of this this zoom lens is to represent with the rotation step number that the step that drives zoom lens is driven motor.
Wherein the position of this zoom lens is to represent with the magnitude of voltage of the voltage motor that drives zoom lens.
Wherein zoom lens motionless zoom lens is to reduce magnification in this steps A.
Wherein the calibration samples ecto-entad in this steps A is provided with housing, center, inside casing, reaches this bold box, this oblique line district.
Description of drawings
Other purposes of the present invention, effect and embodiment see also accompanying drawing and are described in detail as follows, wherein:
Fig. 1 is the synoptic diagram of existing amplifying ratio of camera correction chart;
Fig. 2 is the synoptic diagram of amplifying ratio of camera calibration samples of the present invention;
Fig. 3 is the synoptic diagram of this clearly demarcated amplifying ratio of camera correction arrangement.
Embodiment
The present invention utilizes calibration samples shown in Figure 2 20, captures its image for digital camera CCD (charged coupled device) sampling area.These calibration samples 20 ecto-entads are provided with housing 21, center 22, inside casing 23, bold box 24, oblique line district 25; This central authorities' bold box 24 is used to define the specific region, and when CCD reads this specific region, the convenient block of judging relative image in the corresponding CCD of this specific region institute; The design of the chequered with black and white lines in this oblique line district 25 also can make things convenient for the automatic focusing operation of camera except that the scope that can define the specific region.
When seeing also correcting camera magnification shown in Figure 3, of the present invention, be that camera 30 is put in support 40 tops, calibration samples 20 be put in the place ahead of camera 30 camera lenses; The image of camera 30 acquisition calibration samples 20 can be shown on the TV screen, adjust the placement location of camera 30, make optical axis 31 pass the CCD center of calibration samples 20 and camera 30, to obtain preferable correction.
The present invention utilizes camera when different magnification, the pixel that the specific region is captured by CCD (Pixel) difference of counting, the i.e. image block area value different characteristic of this specific region on CCD, when magnification is healed when big, image block area value is bigger, and the visual range of camera pick-up image diminishes.So can be in automatically the defocused CCD that reads being gone up the pixel numerical value of acquisition specific region at a certain magnification, compare with pixel numerical value known when this big rate, as the foundation of correcting camera magnification.
The present invention is after making the motor of zoom (Zoom) camera lens playback initialization, progressively improve magnification, and carry out automatically to defocused, picked out the CCD pixel number that (comprises the oblique line district) in the central bold box via bold box, so can utilize computer program to judge that the variation of pixel number is as proofreading and correct foundation.Also can external connection monitors in the trimming process, judge with housing, center, inside casing whether proofread and correct the result correct.
Magnification correcting method for camera of the present invention comprises the steps:
A. zoom lens motionless zoom lens captures the image of calibration samples and carries out focusing;
B. after obtaining the CCD source book, be as the criterion, will deceive, white two is divided into zero and one, laterally reading data,, promptly stop to count in case read to continuously (number) white point in case read to continuously (number) stain then begin counting with brightness;
C. count results is decided to be the block area value, calculates this block area value and the difference that will proofread and correct the known block area value of magnification;
D. judge that this difference is whether among range of allowable error;
E. if this difference is in range of allowable error and proofreaies and correct successfully, then write down the position of zoom lens, otherwise blow the beginning correction program again open behind the zoom lens motionless zoom lens.
Said method, make zoom lens in the moving process that increases magnification gradually, via the pixel number that calculates the specific region image that comprises this bold box and oblique line district of noting down in the CCD, and the pixel number of this specific region image is compared during with known magnification, if both difference be in the time can determining at this magnification within the range of allowable error, the position at zoom lens place.Via method automatically calibrating of the present invention and write down each different magnifications the position of corresponding zoom lens, do not need manually-operated to proofread and correct, also do not need the auxiliary of other optical instruments, can carry out the correction operation of amplifying ratio of camera correctly, fast.
General camera in the time of can calculating the evaluation of estimate of CCD sampling area institute pick-up image data, also can be used the correction that method of the present invention is carried out general amplifying ratio of camera if load onto CCD.The present invention can also write down the position that magnitude of voltage that the step drives rotation step number that horse connects or voltage motor replaces the record zoom lens, can make the step drive horse, reach when rotating certain step number or make the voltage motor when a certain magnitude of voltage equally, zoom lens can be moved to the position that can obtain certain magnification, make camera obtain the image of required magnification.The present invention can carry out the correction of different magnifications with different calibration samples, and removable zoom lens carries out the correction of different magnifications in the mode that reduces magnification.
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 those disclosed embodiments.
In sum, the present invention is different fully with the bearing calibration of existing amplifying ratio of camera, and the enhancement of tool effect, has closed the condition in patent of invention, so apply for a patent in accordance with the law.
Claims (6)
1. a magnification correcting method for camera is characterized in that it comprises the steps:
A. zoom lens motionless zoom lens captures the image of the calibration samples that comprises the specific region and carries out focusing; Wherein this specific region comprises and has the oblique line district in the bold box;
B. after reading the image data of this calibration samples that CCD captures, be as the criterion with brightness, to deceive, white two is divided into zero and one, laterally to read data, count in case read to the consecutive numbers stain then begin, promptly stop counting in case read to the consecutive numbers white point, to calculate the pixel number that comprises this specific region image in the CCD;
C. the count results of this being counted is decided to be the block area value, calculates this block area value and the difference that will proofread and correct the known block area value of magnification;
D. judge that this difference is whether among range of allowable error;
E. if this difference is in range of allowable error and proofreaies and correct successfully, then write down the position of zoom lens, otherwise begin correction program once more behind the zoom lens motionless zoom lens.
2. magnification correcting method for camera as claimed in claim 1 is characterized in that, wherein zoom lens motionless zoom lens is to increase magnification in this steps A.
3. magnification correcting method for camera as claimed in claim 1 is characterized in that, wherein
The position of this zoom lens is to represent with the rotation step number that the step that drives zoom lens is driven motor.
4. magnification correcting method for camera as claimed in claim 1 is characterized in that, wherein the position of this zoom lens is to represent with the magnitude of voltage of the voltage motor that drives zoom lens.
5. magnification correcting method for camera as claimed in claim 1 is characterized in that, wherein zoom lens motionless zoom lens is to reduce magnification in this steps A.
6. magnification correcting method for camera as claimed in claim 1 is characterized in that, wherein the calibration samples ecto-entad in this steps A is provided with housing, center, inside casing, reaches this bold box, this oblique line district.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011345055A CN100397243C (en) | 2001-10-31 | 2001-10-31 | Magnification correcting method for camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011345055A CN100397243C (en) | 2001-10-31 | 2001-10-31 | Magnification correcting method for camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1417639A CN1417639A (en) | 2003-05-14 |
| CN100397243C true CN100397243C (en) | 2008-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011345055A Expired - Fee Related CN100397243C (en) | 2001-10-31 | 2001-10-31 | Magnification correcting method for camera |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685240B (en) * | 2008-09-26 | 2011-07-20 | 致伸科技股份有限公司 | Method for judging focusing quality of image extracting device |
| JP5754124B2 (en) * | 2010-12-14 | 2015-07-29 | セイコーエプソン株式会社 | Projector and control method |
| KR20140109672A (en) * | 2013-03-06 | 2014-09-16 | 동우 화인켐 주식회사 | Method of calibrating position of a photographing apparatus for film |
| CN103646381B (en) * | 2013-11-22 | 2016-02-24 | 西安理工大学 | A kind of distortion correction method of advancing of line array CCD |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942417A (en) * | 1988-06-24 | 1990-07-17 | Olympus Optical Co., Ltd. | Powered zoom camera |
| JPH066837A (en) * | 1992-06-19 | 1994-01-14 | Minolta Camera Co Ltd | Crt measurement device |
| JPH07318787A (en) * | 1994-05-26 | 1995-12-08 | Canon Inc | Automatic zoom device |
| JPH11331648A (en) * | 1998-05-20 | 1999-11-30 | Olympus Optical Co Ltd | Electronic image pickup device |
| US6246446B1 (en) * | 1996-06-28 | 2001-06-12 | Texas Instruments Incorporated | Auto focus system for a SLM based image display system |
| CN1383029A (en) * | 2001-04-25 | 2002-12-04 | 金宝电子工业股份有限公司 | Method for correcting amplifying ratio of camera |
-
2001
- 2001-10-31 CN CNB011345055A patent/CN100397243C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942417A (en) * | 1988-06-24 | 1990-07-17 | Olympus Optical Co., Ltd. | Powered zoom camera |
| JPH066837A (en) * | 1992-06-19 | 1994-01-14 | Minolta Camera Co Ltd | Crt measurement device |
| JPH07318787A (en) * | 1994-05-26 | 1995-12-08 | Canon Inc | Automatic zoom device |
| US6246446B1 (en) * | 1996-06-28 | 2001-06-12 | Texas Instruments Incorporated | Auto focus system for a SLM based image display system |
| JPH11331648A (en) * | 1998-05-20 | 1999-11-30 | Olympus Optical Co Ltd | Electronic image pickup device |
| CN1383029A (en) * | 2001-04-25 | 2002-12-04 | 金宝电子工业股份有限公司 | Method for correcting amplifying ratio of camera |
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| Publication number | Publication date |
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| CN1417639A (en) | 2003-05-14 |
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