CN202092658U - Outdoor calibration field for calibrating aerial digital camera - Google Patents
Outdoor calibration field for calibrating aerial digital camera Download PDFInfo
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- CN202092658U CN202092658U CN201120123510XU CN201120123510U CN202092658U CN 202092658 U CN202092658 U CN 202092658U CN 201120123510X U CN201120123510X U CN 201120123510XU CN 201120123510 U CN201120123510 U CN 201120123510U CN 202092658 U CN202092658 U CN 202092658U
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Abstract
The utility model discloses an outdoor calibration field for calibrating an aerial digital camera. Mark points are evenly distributed at certain intervals on a building facade with a plurality of layered structures on the horizontal plane and are used for the automatic extraction of the calibrating software and the determination of a coordinate; and the distance in front of the building facade can meet the requirement that a large format digital camera can obtain the full-scale and clearly focused building facade image after being focused to the infinite distance position. The outdoor calibration field of the utility model is the large-area fluctuating three-dimensional calibration field; the post-processing calculation for the acquired image can be further performed through the special calibrating software after the image of the calibration field is acquired, the inner orientation elements and all distortion parameters of the camera can be worked out, so that the geometrical calibration accuracy in the links can reach the sub-pixel class, thereby achieving the high precision measurement of the common digital camera; and the outdoor calibration field is suitable for calibrating the large area array common digital camera, thereby laying the foundation for the digital aerial survey.
Description
Technical field
The utility model is a kind of outdoor calibration field that is used to demarcate the aviation digital camera, belongs to the photogrammetric measurement technical field.
Background technology
Along with the continuous increase of China territory mapping demand, the be out of step with the times development of mapping of traditional film aerial survey, digital aerial survey will replace the film aerial survey gradually, the aeroplane photography instrument from the film epoch to the digital age transition.Digital camera is to be developed by traditional camera; still use traditional optical system; just variation has taken place in the carrier of image information; changed the CCD chip in the position of original film; the scene light signal is converted to electric signal by CCD; form digitized video by analog to digital conversion again, therefore, thereby digital camera must by calibration obtain camera elements of interior orientation and every distortion factor correct shape of recovering image strip.
Owing to be subjected to the restriction of one camera breadth, popular aviation digital camera all adopts several cameras to be combined into the scheme of a width of cloth large format image at present.The digital aerial surveying camera of import costs an arm and a leg, and because of non-homemade, system is difficult to safeguard that common civilian digital camera is non-scalability that the distortion of camera lens is big, elements of interior orientation the unknown.Therefore, ordinary digital camera can not directly apply to the photogrammetric measurement field before not demarcating.
At present, domestic had several indoor digital camera calibration fields, but because the aeroplane photography camera all requires focusing to the infinite distance in use, the indoor calibration field is difficult to the realization camera and is in " infinite distance " position and takes pictures and get access to the full width of cloth, calibration field image clearly.Even get access to inadequate qualified image, all very high to shooting skill and external condition requirement, the shooting difficulty is very big, and the demarcation difficulty is big.
The utility model content
The purpose of this utility model provides a kind of large-scale outdoor calibration field, the geometric calibration that is used for big battle array digital camera of non-scalability, by gathering the image of this calibration field, can further carry out aftertreatment by special calibration software to the image of gathering calculates, elements of interior orientation and every distortion parameter of this camera can be calculated, thereby the high precision measurementization of ordinary digital camera can be realized.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of outdoor calibration field that is used to demarcate the aviation digital camera having on the surface level on the buildings facade of many levels structure, evenly is laid with monumented point with a determining deviation, and described monumented point is used for the automatic extraction and the coordinate measuring of calibration software; Distance before the buildings facade can satisfy that the large format digital camera can get access to the full width of cloth in focusing to " infinite distance " position, the buildings facade image clearly of focusing.
Described monumented point is circular aluminium flake, is printed as black by screen printing technique, and diameter is 40～60 millimeters, evenly is laid on the buildings facade with 0.6～0.8 meter spacing.
The square Suo Jia RS10T type reflector plate that has the crosshair delineation is pasted at described monumented point center, and the reflector plate length of side is 8～10 millimeters.
Outdoor calibration described in the utility model field, be large tracts of land and the three-dimensional calibration field that fluctuating is arranged, by gathering the image of this calibration field, can further carry out aftertreatment by special calibration software to the image of gathering calculates, can calculate elements of interior orientation and every distortion parameter of this camera, make geometric calibration precision reach sub-pixel level based on above-mentioned link, thereby can realize the high precision measurementization of ordinary digital camera, be applicable to the demarcation of big face battle array generic digital camera, thereby lay the foundation for digital aerial survey.
Description of drawings
According to embodiment and accompanying drawing the utility model is described in further detail below.
Fig. 1 is that structural representation is formed in outdoor calibration described in the utility model field;
Fig. 2 is that monumented point is formed structural representation.
Among the figure:
1, elevator; 2, corridor; 3, body of wall; 4, groove; 5, monumented point; 6, aluminium flake; 7, reflector plate.
Embodiment
Selected certain family dependents' building is as the calibration field that will set up, high about 30 meters of this building, there are elevator 1, corridor 2, body of wall 3 and groove 4 to constitute the spatial structure of four levels in front and back, selected elevator 1, corridor 2, body of wall 3 three-deckers are used to lay monumented point 5, evenly lay monumented point 5 with a determining deviation during laying, described monumented point 5 is used for the automatic extraction and the coordinate measuring of calibration software, and its facade as shown in Figure 1.Opposite in this building is office buildings of five floor for about 35 meters, on office building, can carry out the shooting of different angles with differing heights, overwhelming majority ordinary digital camera is taken on this office building, all can obtain the calibration image of the full width of cloth, the spacing in the 2nd buildings can make camera be in " infinite distance " state and take the acquisition sharp image; Digital camera can be taken, to weaken the offset error of planar sign image center in the differing heights different angles that " infinite distance " located; Being arranged in of monumented point has different levels on the surface level, be beneficial to eliminate the correlativity between the calibration parameter, guarantees the independence of calibration parameter.
According to the functional requirement of calibration software, through repeatedly experiment, finally selected circle marker is as the monumented point of this controlling filed, and the diameter of sign is 60mm.Consider the long-term usability of sign, the material of sign adopts uncorruptible aluminium and makes circular aluminium flake 6.For the phenomenon of fading can appear in monumented point after preventing solar radiation, influence the automatic identification of calibration software, adopt screen printing technique that circular aluminium flake 6 is printed as black, the experiment proved that the result is more stable.For being convenient for measuring the monumented point centre coordinate, paste the reflector plate 7 that has the crosshair delineation at the center of circular aluminium flake 6, because reflector plate 7 has the crosshair delineation, it not only can be used to measuring distance but also can be used to aiming.Reflector plate 7 is of a size of 10mm * 10mm, adopts Suo Jia RS 10T type reflector plate through experiment, does not influence the automatic identification of calibration software to sign image.The monumented point that completes at last as shown in Figure 2.
The laying of monumented point and mensuration:
The sign the made spacing with 0.6～0.8 meter evenly is laid on the different aspects of building body, 900 monumented points have been laid altogether, the coordinate of controlling filed monumented point utilizes the total powerstation polar method to measure, with near normal family dependents' building (calibration field) frontal is the x direction, upwards be the z direction, left-handed system makes up coordinate system, and two observation reference mark are located at the office roof.In order to eliminate indivedual monumented point observation excessive influences in inclination angle, adopt the oblique distance measurement pattern in the total powerstation program to carry out survey time method observation, Using such method is taked centering again, and many person-times of observations are averaged as last achievement.Adopt and breathe out the 50mm of Soviet Union camera lens, the 7K*5K breadth, the pixel size is that the H3D type camera of 6.8 μ m is taken pictures at differing heights and orientation to controlling filed, the image of gathering resolves by calibration software, obtain calibration result, and adopt the method that resamples to verify that the result shows, the integral calibrating precision reaches sub-pixel level (near 1/4th pixels, being better than 2um for this camera precision).
Compare existing laboratory experiment field, the utlity model has following advantage:
1. the measuring method of existing calibration field adopts traditional intersection measurement more, and precision is lower, causes calibration field self precision can not satisfy calibration request; This calibration field can adopt method of many survey time of total powerstation that control survey is carried out in the calibration field, and precision is better than 3mm, satisfies the geometric accuracy requirement of camera calibration fully.
2. this calibration is based on indirect classical photogrammetric principle, sets up digital model and demarcates and resolve, and makes the precision of demarcating based on this calibration place reach 1/4 pixel.
The indoor calibration field can't obtain that " infinite distance " located, full breadth and the calibration field image clearly of focusing, this calibration field filming image mode is flexible, is easy to obtain qualified image.
4. the indoor calibration scene is long-pending less, and is two-dimentional calibration field, and is inapplicable to big face battle array aerial camera; This calibration field is large tracts of land and the three-dimensional calibration field that fluctuating is arranged, and is applicable to the demarcation of big face battle array generic digital camera, thereby lays the foundation for digital aerial survey.
Claims (3)
1. an outdoor calibration field that is used to demarcate the aviation digital camera is characterized in that: having on the surface level on the buildings facade of many levels structure, evenly be laid with monumented point with a determining deviation; Distance before the buildings facade can satisfy that the large format digital camera can get access to the full width of cloth in focusing to " infinite distance " position, the buildings facade image clearly of focusing.
2. outdoor calibration according to claim 1 field, it is characterized in that: described monumented point is circular aluminium flake, is printed as black by screen printing technique, diameter is 40～60 millimeters, evenly is laid on the buildings facade with 0.6～0.8 meter spacing.
3. outdoor calibration according to claim 1 field is characterized in that: the square Suo Jia RS10T type reflector plate that has the crosshair delineation is pasted at described monumented point center, and the reflector plate length of side is 8～10 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120123510XU CN202092658U (en) | 2011-04-25 | 2011-04-25 | Outdoor calibration field for calibrating aerial digital camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120123510XU CN202092658U (en) | 2011-04-25 | 2011-04-25 | Outdoor calibration field for calibrating aerial digital camera |
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| Publication Number | Publication Date |
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| CN202092658U true CN202092658U (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120123510XU Expired - Fee Related CN202092658U (en) | 2011-04-25 | 2011-04-25 | Outdoor calibration field for calibrating aerial digital camera |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289317A (en) * | 2016-07-21 | 2017-01-04 | 河南四维远见信息技术有限公司 | The unit calibration method of a kind of single-lens digital aviation measuring camera and device |
| CN108088467A (en) * | 2016-07-21 | 2018-05-29 | 河南省科学院地理研究所 | A kind of method of calibration and device based on POS terminal and digital aviation measuring camera |
| CN109544644A (en) * | 2018-11-21 | 2019-03-29 | 四川中水成勘院测绘工程有限责任公司 | Outdoor calibration field and method for building up for calibration for cameras |
-
2011
- 2011-04-25 CN CN201120123510XU patent/CN202092658U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289317A (en) * | 2016-07-21 | 2017-01-04 | 河南四维远见信息技术有限公司 | The unit calibration method of a kind of single-lens digital aviation measuring camera and device |
| CN106289317B (en) * | 2016-07-21 | 2017-07-28 | 河南省科学院地理研究所 | The unit calibration method and device of a kind of single-lens digital aviation measuring camera |
| CN108088467A (en) * | 2016-07-21 | 2018-05-29 | 河南省科学院地理研究所 | A kind of method of calibration and device based on POS terminal and digital aviation measuring camera |
| CN108088467B (en) * | 2016-07-21 | 2020-07-31 | 河南省科学院地理研究所 | Verification method and device based on POS equipment and digital aerial survey camera |
| CN109544644A (en) * | 2018-11-21 | 2019-03-29 | 四川中水成勘院测绘工程有限责任公司 | Outdoor calibration field and method for building up for calibration for cameras |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20120425 |