CN105427297B - Image calibration method and device - Google Patents
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- CN105427297B CN105427297B CN201510770199.0A CN201510770199A CN105427297B CN 105427297 B CN105427297 B CN 105427297B CN 201510770199 A CN201510770199 A CN 201510770199A CN 105427297 B CN105427297 B CN 105427297B
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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Abstract
The invention discloses an image calibration method, which comprises the following steps: acquiring an image of a circuit board to be calibrated; identifying positioning points from the image of the circuit board to be calibrated according to the pre-stored characteristic points; the characteristic points are picture areas in the standard image; and adjusting the image of the circuit board to be calibrated according to a preset matching rule to enable the positions of the positioning points and the feature points to be the same. Correspondingly, the invention also discloses an image calibration device. By adopting the embodiment of the invention, the calibration precision of the circuit board image can be improved.
Description
Technical field
The present invention relates to automatic optics inspection technical field more particularly to a kind of image calibrating methods and device.
Background technique
Automatic optics inspection (AOI, Automated Optical Inspection) is that industrial automation effectively detects
Method uses machine vision as examination criteria technology, is widely used on LCD/TFT, transistor and PCB industry processing procedure,
People's livelihood purposes then may extend to safety system.Automatic optics inspection is representative gimmick common in industrial process, utilizes optics
Mode obtains the surface state of finished product, the flaws such as foreign matter or pattern anomalies is detected with image processing, because be contactless inspection
It looks into, so can be in intermediate engineering supervision semi-finished product.
In the image for obtaining circuit board by AOI, and before testing to its image, need to be first detection by its image calibration
Required standard picture.In the prior art, the method calibrated to image generally designs special anchor point on circuit boards,
During image calibration, anchor point is acquired, and according to the displacement of the anchor point come calibration circuit board image.But
The above method can make the production of anchor point and the calibration effect of identification error influence circuit board image, and the acquisition of anchor point is also held
Vulnerable to production process, lossless and acquisition environment influence, moreover, if anchor point is not added in design for circuit board, it can not
The circuit board of not anchor point is calibrated and examined, meanwhile, the design of anchor point will receive the design experiences of designer
It influences, to influence the calibration accuracy of circuit board image.
Summary of the invention
The embodiment of the present invention proposes a kind of image calibrating method and device, can be improved the calibration accuracy of circuit board image.
The embodiment of the present invention provides a kind of image calibrating method, comprising:
Obtain the image of circuit board to be calibrated；
According to the characteristic point prestored, anchor point is identified from the image of the circuit board to be calibrated；The characteristic point is
Picture region in standard picture；
According to preset matching rule, the image of the circuit board to be calibrated is adjusted, the anchor point and the feature are made
The position of point is identical.
Further, before the image for obtaining circuit board to be calibrated, further includes:
Obtain the standard picture of circuit board；
N number of characteristic point is chosen from the standard picture, and accordingly saves the characteristic information of each characteristic point；The feature
Information includes the picture and location information of characteristic point；N≥2；
According to the number of characteristic point, configurations match rule；The matching rule includes the characteristic information of characteristic point, image turn
Change type and image degree of conversion.
Further, described according to preset matching rule, the image of the circuit board to be calibrated is adjusted, the positioning is made
Point is identical as the position of the characteristic point, specifically includes:
According to described image translation type, the circuit board to be calibrated is adjusted in the range of described image degree of conversion
Image keeps each anchor point identical as the position of its individual features point.
Further, after the number according to characteristic point, configurations match rule, further includes:
Using the matching rule, calibration test is carried out to the sampled images of circuit board；
If calibration test does not pass through, the number and its corresponding matching rule of characteristic point are adjusted, and continues to calibrate
Test；
If calibration test passes through, the matching rule is saved.
Further, described image translation type includes at least one of rotation, affine transformation or perspective transform；It is described
Image degree of conversion includes image angle degree of conversion and image scaled degree of conversion.
Correspondingly, the invention also discloses a kind of image calibration devices, comprising:
Image collection module, for obtaining the image of circuit board to be calibrated；
Anchor point identification module, for being identified from the image of the circuit board to be calibrated according to the characteristic point prestored
Anchor point；The characteristic point is the picture region in standard picture；And
Image adjustment module makes described for adjusting the image of the circuit board to be calibrated according to preset matching rule
Anchor point is identical as the position of the characteristic point.
Further, described image calibrating installation further include:
Standard picture obtains module, for obtaining the standard picture of circuit board；
Characteristic point chooses module, for choosing N number of characteristic point from the standard picture, and accordingly saves each characteristic point
Characteristic information；The characteristic information includes the picture and location information of characteristic point；N≥2；And
Rule configuration module, for the number according to characteristic point, configurations match rule；The matching rule includes characteristic point
Characteristic information, image translation type and image degree of conversion.
Further, described image adjustment module is specifically used for being converted according to described image translation type in described image
The image that the circuit board to be calibrated is adjusted in the range of degree keeps each anchor point identical as the position of its individual features point.
Further, described image calibrating installation further include:
Calibration test module carries out calibration test to the sampled images of circuit board for using the matching rule；
Rule adjustment module, if not passing through for calibration test, the number and its corresponding matching for adjusting characteristic point are advised
Then, and continue calibration test；And
Preserving module saves the matching rule if passing through for calibration test.
Further, described image translation type includes at least one of rotation, affine transformation or perspective transform；It is described
Image degree of conversion includes image angle degree of conversion and image scaled degree of conversion.
The implementation of the embodiments of the present invention has the following beneficial effects:
Image calibrating method and device provided in an embodiment of the present invention, can be with uniqueness by feature in standard picture
Picture region identifies anchor point from the image of circuit board to be calibrated as characteristic point, and according to characteristic point, according to anchor point
With the positional relationship of characteristic point, the image of circuit board to be calibrated is adjusted using matching rule, in the image for making circuit board to be calibrated
The position of each element is consistent in standard picture, improves the calibration accuracy of circuit board image, and without setting in circuit board
Anchor point is arranged in timing, improves the applicability to the image calibration of no anchor point circuit board.
Moreover, different matching rules is configured according to different feature point numbers, to convert class using different images
Type adjusts the image of circuit board to be calibrated, improves the applicability and robustness of device；After having configured matching rule, using
Calibration test is carried out to sampling figure with rule, can be adjusted for calibrating unacceptable matching rule, reduce calibration error.
Detailed description of the invention
Fig. 1 is the flow diagram of one embodiment of image calibrating method provided by the invention；
Fig. 2 is the part flow diagram of another embodiment of image calibrating method provided by the invention；
Fig. 3 is the structural schematic diagram of one embodiment of image calibration device provided by the invention；
Fig. 4 is the partial structure diagram of another embodiment of image calibration device provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is the flow diagram of one embodiment of image calibrating method provided by the invention referring to Fig. 1, comprising:
S1, the image for obtaining circuit board to be calibrated；
The characteristic point that S2, basis prestore, identifies anchor point from the image of the circuit board to be calibrated；The characteristic point
For the picture region in standard picture；
S3, according to preset matching rule, adjust the image of the circuit board to be calibrated, make the anchor point and the spy
The size and location for levying point is identical.
It should be noted that in a calibration process, first treating calibration circuit board and taking pictures, further according to the characteristic point prestored
Picture, identify corresponding anchor point from the image for shooting circuit board to be calibrated.Wherein, characteristic point is weight in standard picture
It is multiple it is less, be not easy to obscure with other positions, feature picture region with uniqueness.According to preset matching rule, treat
The image of calibration circuit board is adjusted, and keeps the position of its corresponding characteristic point of anchor point identical, thus by circuit to be calibrated
The image calibration of plate is aligned with standard picture, improves the calibration accuracy of circuit board image.
It should be noted that after being calibrated to circuit board image, in circuit board image the position of each element with
It is consistent in standard picture, facilitate subsequent each point to be detected in circuit board image to be identified and detected.
Further, as shown in Fig. 2, before the image for obtaining circuit board to be calibrated, further includes:
S01, the standard picture for obtaining circuit board；
S02, N number of characteristic point is chosen from the standard picture, and accordingly save the characteristic information of each characteristic point；It is described
Characteristic information includes the picture and location information of characteristic point；N≥2；
S03, the number according to characteristic point, configurations match rule；The matching rule includes the characteristic information of characteristic point, figure
As translation type and image degree of conversion.
It should be noted that needing of first configuration circuit plate image before the image for treating calibration circuit board is calibrated
With rule.The standard picture for first shooting circuit board, can shoot one or more photo.N number of feature is chosen from standard picture
The Criterion of Selecting of point, characteristic point is feature picture region with uniqueness in standard picture, can once choose multiple characteristic points
Using as spare characteristic point.After selected characteristic point, different matching rules can be configured according to the number of characteristic point.For example, if special
The number of sign point is 2, then sets image translation type as rotation, i.e., in a calibration process, can treat the image of calibration circuit board
Carry out rotation process；If the number of characteristic point is 3, image translation type is set as affine transformation and perspective transform, i.e., in school
During standard, the image that can treat calibration circuit board carries out the operation of affine transformation and perspective transform.Pass through to characteristic point
Several and image translation type restriction, can be to avoid the transformation result of mistake.Meanwhile characteristic point being ranked up, and save it
Individual features information is into matching rule.Moreover, multiple matching rules can be configured for the same standard picture, and it is arranged every
The priority of a matching rule is chosen matching rule according to priority and is calibrated to image in a calibration process.
Further, described according to preset matching rule, the image of the circuit board to be calibrated is adjusted, the positioning is made
Point is identical as the position of the characteristic point, specifically includes:
According to described image translation type, the circuit board to be calibrated is adjusted in the range of described image degree of conversion
Image keeps each anchor point identical as the position of its individual features point.
It should be noted that according to the image translation type being arranged in matching rule, treat the image of calibration circuit board into
Row conversion, conversion range are the range for the image degree of conversion being arranged in matching rule.In conversion process, according to matching rule
The sequence of middle characteristic point, it is respectively that the anchor point in the image of circuit board to be calibrated is corresponding with characteristic point, so that every after conversion
The position of its corresponding characteristic point of a anchor point is identical.
Further, after the number according to characteristic point, configurations match rule, further includes:
Using the matching rule, calibration test is carried out to the sampled images of circuit board；
If calibration test does not pass through, the number and its corresponding matching rule of characteristic point are adjusted, and continues to calibrate
Test；
If calibration test passes through, the matching rule is saved.
It should be noted that after configuring matching rule, can be used the matching rule to the sampled images of circuit board into
Row calibration test tests its calibration accuracy, and provides testing evaluation.Wherein, test method is first according to characteristic point from sample graph
Anchor point is identified as in, is calibrated further according to anchor point.Testing evaluation includes the number of anchor point, anchor point identification essence
Degree, anchor point distance etc..Wherein, anchor point quantity is more, and image calibration precision is higher, then testing evaluation is higher；It is adopting
After increasing noise, or reduction sampled images quality in sampled images, score anchor point identification accuracy；Anchor point distance is got over
Greatly, anchor point identification is more accurate, then testing evaluation is higher.After scoring, judge that calibration test passes through according to testing evaluation
Whether, if calibration test passes through, illustrates that the result tested using the matching rule is accurate, the matching rule pair can be used
The image of circuit board to be calibrated is tested；If calibration test does not pass through, illustrate the knot tested using the matching rule
Fruit is not accurate, image translation type and image degree of conversion in the characteristic point and matching rule chosen is adjusted, so as to adopt
With the matching rule carry out calibration can achieve the effect that it is satisfied.
Further, described image translation type includes at least one of rotation, affine transformation or perspective transform；It is described
Image degree of conversion includes image angle degree of conversion and image scaled degree of conversion.
Image calibrating method provided in an embodiment of the present invention, can be by the picture region with uniqueness of feature in standard picture
Anchor point is identified from the image of circuit board to be calibrated as characteristic point, and according to characteristic point in domain, according to anchor point and feature
The positional relationship of point, the image of circuit board to be calibrated is adjusted using matching rule, makes each member in the image of circuit board to be calibrated
The position of part is consistent in standard picture, improves the calibration accuracy of circuit board image, and without setting in board design
Anchor point is set, the applicability to the image calibration of no anchor point circuit board is improved；According to different feature point numbers, configuration is different
Matching rule improve being applicable in for device to adjust the image of circuit board to be calibrated using different image translation types
Property and robustness；After having configured matching rule, calibration test is carried out to sampling figure using matching rule, it is obstructed for calibrating
The matching rule crossed can be adjusted, and reduce calibration error.
Correspondingly, can be realized the image calibration side in above-described embodiment the present invention also provides a kind of image calibration device
All processes of method.
It is the structural schematic diagram of one embodiment of image calibration device provided by the invention referring to Fig. 3, comprising:
Image collection module 1, for obtaining the image of circuit board to be calibrated；
Anchor point identification module 2, for being identified from the image of the circuit board to be calibrated according to the characteristic point prestored
Anchor point；The characteristic point is the picture region in standard picture；And
Image adjustment module 3, for adjusting the image of the circuit board to be calibrated, making institute according to preset matching rule
It is identical as the position of the characteristic point to state anchor point.
Further, as shown in figure 4, described image calibrating installation further include:
Standard picture obtains module 01, for obtaining the standard picture of circuit board；
Characteristic point chooses module 02, for choosing N number of characteristic point from the standard picture, and accordingly saves each feature
The characteristic information of point；The characteristic information includes the picture and location information of characteristic point；N≥2；And
Rule configuration module 03, for the number according to characteristic point, configurations match rule；The matching rule includes feature
Characteristic information, image translation type and the image degree of conversion of point.
Further, described image adjustment module is specifically used for being converted according to described image translation type in described image
The image that the circuit board to be calibrated is adjusted in the range of degree keeps each anchor point identical as the position of its individual features point.
Further, described image calibrating installation further include:
Calibration test module carries out calibration test to the sampled images of circuit board for using the matching rule；
Rule adjustment module, if not passing through for calibration test, the number and its corresponding matching for adjusting characteristic point are advised
Then, and continue calibration test；And
Preserving module saves the matching rule if passing through for calibration test.
Further, described image translation type includes at least one of rotation, affine transformation or perspective transform；It is described
Image degree of conversion includes image angle degree of conversion and image scaled degree of conversion.
Image calibration device provided in an embodiment of the present invention, can be by the picture region with uniqueness of feature in standard picture
Anchor point is identified from the image of circuit board to be calibrated as characteristic point, and according to characteristic point in domain, according to anchor point and feature
The positional relationship of point, the image of circuit board to be calibrated is adjusted using matching rule, makes each member in the image of circuit board to be calibrated
The position of part is consistent in standard picture, improves the calibration accuracy of circuit board image, and without setting in board design
Anchor point is set, the applicability to the image calibration of no anchor point circuit board is improved；According to different feature point numbers, configuration is different
Matching rule improve being applicable in for device to adjust the image of circuit board to be calibrated using different image translation types
Property and robustness；After having configured matching rule, calibration test is carried out to sampling figure using matching rule, it is obstructed for calibrating
The matching rule crossed can be adjusted, and reduce calibration error.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of image calibrating method characterized by comprising
Obtain the image of circuit board to be calibrated；
According to the characteristic point prestored, anchor point is identified from the image of the circuit board to be calibrated；The characteristic point is standard
Feature picture region with uniqueness in image；
According to preset matching rule, the image of the circuit board to be calibrated is adjusted, makes the anchor point and the characteristic point
Position is identical；Wherein, the matching rule is configured according to the number of the characteristic point.
2. image calibrating method as described in claim 1, which is characterized in that the image for obtaining circuit board to be calibrated it
Before, further includes:
Obtain the standard picture of circuit board；
N number of characteristic point is chosen from the standard picture, and accordingly saves the characteristic information of each characteristic point；The characteristic information
Picture and location information including characteristic point；N≥2；
According to the number of characteristic point, configurations match rule；The matching rule includes the characteristic information of characteristic point, image conversion class
Type and image degree of conversion.
3. image calibrating method as claimed in claim 2, which is characterized in that it is described according to preset matching rule, adjust institute
The image for stating circuit board to be calibrated keeps the anchor point identical as the position of the characteristic point, specifically includes:
According to described image translation type, the figure of the circuit board to be calibrated is adjusted in the range of described image degree of conversion
Picture keeps each anchor point identical as the position of its individual features point.
4. image calibrating method as claimed in claim 2 or claim 3, which is characterized in that in the number according to characteristic point, configuration
After matching rule, further includes:
Using the matching rule, calibration test is carried out to the sampled images of circuit board；
If calibration test does not pass through, the number and its corresponding matching rule of characteristic point are adjusted, and continues calibration test；
If calibration test passes through, the matching rule is saved.
5. image calibrating method as claimed in claim 2 or claim 3, which is characterized in that described image translation type includes rotation, imitates
Penetrate at least one of transformation or perspective transform；Described image degree of conversion includes that image angle degree of conversion and image scaled turn
Change degree.
6. a kind of image calibration device characterized by comprising
Image collection module, for obtaining the image of circuit board to be calibrated；
Anchor point identification module, for identifying positioning from the image of the circuit board to be calibrated according to the characteristic point prestored
Point；The characteristic point is the feature picture region with uniqueness in standard picture；And
Image adjustment module, for adjusting the image of the circuit board to be calibrated, making the positioning according to preset matching rule
Point is identical as the position of the characteristic point；Wherein, the matching rule is configured according to the number of the characteristic point.
7. image calibration device as claimed in claim 6, which is characterized in that described image calibrating installation further include:
Standard picture obtains module, for obtaining the standard picture of circuit board；
Characteristic point chooses module, for choosing N number of characteristic point from the standard picture, and accordingly saves the spy of each characteristic point
Reference breath；The characteristic information includes the picture and location information of characteristic point；N≥2；And
Rule configuration module, for the number according to characteristic point, configurations match rule；The matching rule includes the spy of characteristic point
Reference breath, image translation type and image degree of conversion.
8. image calibration device as claimed in claim 7, which is characterized in that described image adjusts module and is specifically used for according to institute
Image translation type is stated, the image of the circuit board to be calibrated is adjusted in the range of described image degree of conversion, it is each fixed to make
Site is identical as the position of its individual features point.
9. image calibration device as claimed in claim 7 or 8, which is characterized in that described image calibrating installation further include:
Calibration test module carries out calibration test to the sampled images of circuit board for using the matching rule；
Rule adjustment module adjusts the number and its corresponding matching rule of characteristic point if not passing through for calibration test, and
Continue calibration test；And
Preserving module saves the matching rule if passing through for calibration test.
10. image calibration device as claimed in claim 7 or 8, which is characterized in that described image translation type include rotation,
At least one of affine transformation or perspective transform；Described image degree of conversion includes image angle degree of conversion and image scaled
Degree of conversion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770199.0A CN105427297B (en) | 2015-11-12 | 2015-11-12 | Image calibration method and device |
| PCT/CN2016/096893 WO2017080283A1 (en) | 2015-11-12 | 2016-08-26 | Image calibration method and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770199.0A CN105427297B (en) | 2015-11-12 | 2015-11-12 | Image calibration method and device |
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| CN105427297B true CN105427297B (en) | 2018-12-18 |
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| CN105427297B (en) * | 2015-11-12 | 2018-12-18 | 广州视源电子科技股份有限公司 | Image calibration method and device |
| US10417738B2 (en) | 2017-01-05 | 2019-09-17 | Perfect Corp. | System and method for displaying graphical effects based on determined facial positions |
| CN109429473A (en) * | 2017-08-28 | 2019-03-05 | 株洲中车时代电气股份有限公司 | Automatic check method and device with polarity electronic component in circuit board |
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| CN1318839C (en) * | 2002-11-28 | 2007-05-30 | 威光机械工程股份有限公司 | Automated Optical Inspection Method for Defective Components on Printed Circuit Boards |
| JP4461159B2 (en) * | 2007-06-14 | 2010-05-12 | ヤマハファインテック株式会社 | Printed circuit board inspection apparatus and inspection method |
| CN105427297B (en) * | 2015-11-12 | 2018-12-18 | 广州视源电子科技股份有限公司 | Image calibration method and device |
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| CN102316242A (en) * | 2010-07-06 | 2012-01-11 | 鸿富锦精密工业（深圳）有限公司 | Image correcting system and correcting method thereof |
| CN102567724A (en) * | 2010-12-11 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | Image correction system and method |
| CN103020945A (en) * | 2011-09-21 | 2013-04-03 | 中国科学院电子学研究所 | Remote sensing image registration method of multi-source sensor |
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