EP3436776A2 - Photogrammetrietafel, photogrammetrieanordnung und photogrammetrieverfahren - Google Patents
Photogrammetrietafel, photogrammetrieanordnung und photogrammetrieverfahrenInfo
- Publication number
- EP3436776A2 EP3436776A2 EP17717320.0A EP17717320A EP3436776A2 EP 3436776 A2 EP3436776 A2 EP 3436776A2 EP 17717320 A EP17717320 A EP 17717320A EP 3436776 A2 EP3436776 A2 EP 3436776A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- photogrammetry
- markings
- panel
- groups
- identification information
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
- G01C11/025—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures by scanning the object
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/02—Means for marking measuring points
Definitions
- the invention relates to a Photogrammetrietafel with at least two groups of markers, which are arranged crossed to each other.
- Such photogrammetrietafeins are known and used to define a coordinate system in a photogrammetric method.
- the photogrammetry board is recorded in a scene. From the (in perspective and distorted due to the imaging direction) image of the photogrammetry panel, it is possible to derive a coordinate system for the surface to be measured.
- scale bars are used in the prior art. These rods have circular marks and identification features and are manufactured and calibrated with the highest precision. Due to this precision, a measurement accuracy in the range of 50 to 500 microns can be achieved with typical object sizes.
- the invention further relates to a photogrammetry device with the already described photogrammetry panel and to a data processing device adapted for photogrammetric processing of a captured image.
- the invention relates to a photogrammetric method in which a photogrammetry board having at least two intersecting groups of markers is placed in a scene, at least one image being taken of the scene, and of which at least two are intersecting. zenden groups of markers a coordinate system of the at least one recorded image is determined.
- the invention is based on the object to simplify the expenditure on equipment in a photogrammetric method.
- the features of claim 1 are provided according to the invention.
- the photogrammetry panel is made of a printed material.
- the material has a known coefficient of thermal expansion, which can be deposited to a temperature compensation of an expansion of the material.
- Preferred materials are for example PVC, sandwich materials, for example from combinations of plastic and metal layers, or - particularly preferred - sheet.
- the at least two groups of markings are applied in separate printing webs.
- the advantage here is that a good compromise between the requirement of a large-scale panel on the one hand and the requirement of limited to achieve a high printing accuracy printable area can be found.
- the markings can be applied in the printing direction with high accuracy, so as to allow the derivation of a scaling from the recorded images.
- the at least two groups of markings are applied in a precision printing process.
- the precision printing process is carried out in two printing steps, in which the two groups of markings are formed or applied separately from one another.
- the at least two groups of markings are applied in each case one diagonal of a rectangular basic shape.
- the advantage here is that a material consumption for the photogrammetry panel, which results from the expansions of the groups of markings, can be minimized. This is particularly favorable in comparison to the hitherto customary orientations of the groups of markings parallel to edges of a rectangular basic shape.
- an identification information is applied.
- the photogrammetry panel used is automatically identifiable.
- this identification information is designed machine readable.
- the identification information is applied redundantly as a main identification information and a control identification information.
- a main identification information is verifiable. This is to avoid reading errors that reason of partially concealed identification information.
- the identification information is formed independently of the at least two groups of markings.
- the advantage here is that the identification information does not have to be applied with the same precision as the two groups of markings which define the scaling and / or the coordinate system.
- the identification information is applied in an intersection region of the at least two groups of markings. This has the advantage that the identification information is shown uncovered in typical measurement situations.
- identification information in particular the already mentioned identification information, is applied in a method separate from the application of the at least two groups of markings.
- an identification information tailored to the photogrammetry panel can be applied with a particularly inexpensive printing method or other methods. It is thus also possible to apply the identification information in an undetachable manner, for example by embossing, engraving or the like.
- a strip-shaped surface, on which one of the at least two groups of markings is applied is defined by material recesses in a rectangular basic shape.
- the advantage here is that a net weight of the photogrammetry panel can be reduced.
- the material recesses can be used in order, for example, to each case to form a handle on which the photogrammetry panel is portable.
- a plug-in area is formed with which the Photogrammetrietafel is plugged into a soft ground.
- the advantage here is that the photogrammetry panel can be aligned in a simple manner parallel or nearly parallel to upright surfaces. It is particularly advantageous if the plug-in area is formed unprinted. In this way it can be easily achieved that information contained in the printing remains uncovered by the insertion of the photogrammetry panel. It is particularly favorable when the plug-in area is designed to plug the photogrammetry panel into a region of the earth's surface having earth. This can be achieved, for example, by a blade-like edge or by plug-in projections or in another way.
- the Photogrammetrietafein is made of printed aluminum and / or steel. It has been found that these materials are particularly easy to process and can be used for this purpose.
- the characteristics of the sibling claim aimed at a photogrammetry arrangement are provided according to the invention in a photogrammetric arrangement.
- the data processing unit determine a coordinate system image from the at least two intersecting groups of Marks on the Photogrammetrietafel and for determining a scaling information from the markers on the Photogrammetrietafel is set up in the image.
- the advantage here is that the previously common separation of (large-scale) panels for defining a coordinate system on the one hand and (high-precision) scales for determining a scaling information on the other hand is repealed.
- the data processing unit is now set up, for example by appropriate programming and / or electronic conditioning, that a photogrammetry panel is sufficient for both purposes. It is particularly advantageous if the photogrammetry panel according to the invention is designed, in particular as described above and / or according to one of the claims made on a photogrammetry panel.
- the data processing unit is set up for extraction of at least one identification information on the photogrammetry panel in the at least one recorded image.
- the photogrammetry panel used is identifiable. It is particularly favorable if the identification information can be extracted by means of feature recognition.
- the identification information on the one hand recognizable and the other is automatically extractable. This can be achieved, for example, by particularly well-recognizable features, for example edges, corners, contrast differences.
- the data processing unit is set up to match a main identification information with a control identification information of an identification information, in particular the one already mentioned.
- the advantage here is that the iden- t Schemesinformation automatically readable and on read-out errors, which may be generated for example by a partially concealed identification information, is verifiable.
- the advantage here is that the use of temperature-stabilized materials for the Photogrammetrietafel is dispensable.
- the temperature sensor is formed on the photogrammetry panel.
- the advantage here is that a temperature of the Photogrammetrietafel, which allows the determination of an actual extent of the Photogrammetrietafel and thus the group of marks printed thereon, is possible.
- the temperature compensation is arranged so that a heat from the photogrammetry panel is compensated. Such temperature compensation makes it possible to significantly increase the accuracy of extraction of scaling information from the taken photogrammetry panel.
- an image pickup device is formed, with which the image is receivable.
- the advantage here is that a compact arrangement can be formed, which can be easily transportable.
- the image recording device and the data processing unit are integrated in a handheld device.
- a temperature sensor for example, the aforementioned temperature sensor, is formed on the image pickup device.
- the advantage here is that a transfer of the temperature readings to the data processing unit is easy to implement.
- the features of the independent claim directed to a photogrammetric method are provided according to the invention in a photogrammetric method.
- the markings are printed on a material, in particular sheet metal, and determined from the markings of a scaling information relative to the at least one recorded image.
- the advantage here is that both the coordinate system and the scaling information with a measuring aid, the already mentioned Photogramm- metrietafel, are recoverable. The apparatus required for ⁇ leadership of the photogrammetry method is thus significantly reduced.
- the photogrammetry panel according to the invention is designed, in particular as described above and / or according to one of the claims directed to a photogrammetry panel, and / or if the photogrammetry panel is part of a photogrammetry arrangement according to the invention, in particular as described above and / or according to one of the claims directed on a Photogrammetrianssen claims is formed.
- the advantages of the photogrammetry panel according to the invention and / or the photogrammetry arrangement according to the invention can be utilized in the photogrammetric method according to the invention.
- a distance of at least two markings from one another in a group of at least two groups Markings is weighted more heavily than a relative position of at least two markers from different groups.
- the advantage here is that a relative alignment of the groups to each other must be done with a lower accuracy than the orientation of the markers within a group.
- an angle between the groups of markings and / or an offset of the two groups of markings which result from the manufacturing tolerances of the printing process can be manufactured with greater indeterminacy without the accuracy of the scaling information suffering.
- an error message is generated when a predetermined minimum number of markings in a group of the at least two groups in the at least one recorded image is not identifiable or not identified.
- the scaling information is temperature-compensated with a temperature measured value.
- the advantage here is that one Change a size of a Photgrammetrietafel bearing the marks, due to temperature changes is compensated. It is therefore particularly favorable if the temperature compensation leads to a compensation of thermal expansion of the photogrammetry panel.
- a photogrammetry arrangement according to the invention in particular as described above and / or according to one of the claims directed to a photogrammetry device, is used.
- a simple implementation of a photogrammetric method according to the invention is described.
- FIG 3 shows an application scenario in a side view of a photogrammetry panel according to the invention in a photogrammetric method according to the invention, wherein the photogrammetry panel is shown in three conceivable positions as an example. is arranged.
- a photogrammetry panel according to the invention generally designated 1 has a first group 2 of markings 3 and a second group 4 of markings 5.
- the markers 3, 5 are each circular in shape and identical to one another.
- the four marks 3 thus form a linear array of marks in the first group 2, while the five marks 5 represent a linear array of marks in the second group 4.
- other, in particular larger or smaller, numbers of markings 3, 5 are formed.
- the marks 3, 5 are printed on a sheet 6 or other material with a known coefficient of thermal expansion.
- the markings 3 are applied in a first printing web 7 along a diagonal of the rectangular sheet 6.
- the markings 5 are applied crossing in a second printing web 8.
- the printing webs 7 and 8 are successively applied in a precision printing process.
- an identification information 10 is formed in an intersection region 9 of the groups 2, 4 in an identification information 10 is formed.
- the identification information 10 is applied with lower printing accuracy and is applied in a separate process from the mentioned precision printing process.
- the identification information 10 is subdivided into a main identification information 11 and a control identification information 12, for example a checksum.
- the control identification information 12 is usable to automatically check the correct extraction of the main identification information 11.
- the printing webs 7, 8 are each so occupied that they lie on a strip-shaped surface 13, 14.
- the strip-shaped surface 13 is therefore arranged crossed to the strip-shaped surface 14.
- the strip-shaped surfaces 13, 14 are given by the fact that in unprinted areas material recesses 15, 16, 17, 18 are formed.
- the material recesses 15, 16, 17, 18 not only reduce the dead weight of the photogrammetry panel 1, but at the same time form a handle 19.
- an unprinted plug-in area 20 is formed with which the Photogrammetrietafel in a region of the earth's surface, the earth or other soft material is pluggable.
- the photogrammetry panel 1 is made of a sheet 6, of aluminum or of steel.
- a temperature sensor 21 is arranged, with which a temperature of the Photogrammetrietafel 1 can be detected.
- This temperature sensor 21 is connected to measured value transmission means, not shown further, in order to transmit the temperature measured value to a data processing unit 26 (compare FIGS. 2 and 3).
- the data processing unit 26 is set up for a temperature compensation of a scaling information determined from at least one recorded image on the basis of the temperature measured value for a compensation of a thermal expansion of the photogrammetry screen 1.
- the data processing unit 26 is in this case part of a photogrammetry device 25 according to the invention shown in FIGS. 2 and 3 which, in addition to the photogrammetry panel shown, has the already mentioned data processing device 26, for example in an image recording device 24 or as a separate unit, which leads to a photogrammetric processing of at least one recorded image is set up.
- the data processing unit 26 is set up such that a coordinate system can be calculated from the position of the markers 3, 5 of the groups 2, 4 in the recorded image and from a distance of at least two markings 3, 5 within a common group 2, 4 of a scaling information.
- an image recording device 24 for example a camera, likewise shown by way of example in FIGS. 2 and 3, is furthermore provided in the photogrammetry device 25. forms.
- the image pickup device 24 may be provided with another temperature sensor for compensating thermal expansion of the photogrammetry board 1.
- the photogrammetry board 1 shown in Fig. 1 is arranged in a scene, and an image is taken of the scene with the image pickup device 24. This is illustrated by way of example in the typical application scenarios according to FIG. 2 (top view) and FIG. 3 (side view).
- the photogrammetry panel 1 of a photogrammetry assembly 25 is positioned close to, in particular, an object 22 of the scene 23. Subsequently, the scene 23 is recorded with the object 22 and the Photogrammetrietafel 1 with an image pickup device 24 of the photogrammetry 25. 2 shows temporally successively selected positions of the image recording device 24, for example a camera, from which the scene 23 is recorded.
- assemblies are provided with a plurality of image pickup devices 24, each of which is arranged in a fixed position or fixed relative to one another, for example, so-called multi-camera structures.
- the photogrammetry panel 1 can be arranged in different positions relative to the object 22.
- the representation is only to be understood as an example, and further positions are conceivable and acceptable.
- the Photogrammetry board 1 for example, be arranged directly in front of the object 22 with a tilt to the image pickup device 24.
- the photogrammetry panel 1 may be, for example, directly ajar against the object 22 (right position in FIG. 3), laid flat on a floor 25 (middle position) or placed on the floor at an adjustable angle (right position in FIG. 3) ).
- the different images taken with the image recording device 24 are such that the relative position of the photogrammetry plate 1 with respect to the scene 23 or at least the object 22 does not change between the individual images.
- the two groups 2, 4 of markings 3, 5 are identified with a data processing unit of the photogrammetry arrangement, and a coordinate system of the recorded image is determined from the at least two intersecting groups 2, 4 of markings 3, 5.
- This coordinate system describes the position of the photogrammetric blackboard 1 with respect to the imaging direction.
- a scaling information which characterizes an imaging distance to the photogrammetry panel 1 is also determined.
- distances between markers 3 and 5 within group 2 or 4 are weighted more strongly than distances between markings 3, 5 which do not belong to the same group 2, 4. This takes into account that the relative orientation of the group 2 to the group 4 is of lesser accuracy than the arrangement of the markers 3, 5 within the own group 2, 4 can be produced.
- the data processing unit issues an error message when a predetermined minimum number of markings 3, 5 in one of the two groups 2, 4 or both groups 2, 4 together can no longer be identified.
- the user recognizes that he must check the positioning of the photogrammetry panel 1 and if necessary change it in order to obtain a useable recording of an image.
- the temperature sensor 21 transmits a temperature reading from the photogrammetry panel 1 to the aforementioned data processing unit. In the data processing unit, it is calculated from this temperature measurement value, which distance the markings 3 within the group 2 from one another or the markings 5 of the group 4 actually have, so that a thermal expansion of the photogrammetry board 1 is compensated. From these temperature-compensated distance information, a temperature-compensated scaling information is then calculated in a manner known per se.
- the photogrammetry panel 1 for use in a photogrammetric method it is thus proposed to print at least two groups 2, 4 of markings 3, 5 in a crossed arrangement on a material, in particular on a metal sheet 6.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Multimedia (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Printing Methods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016003883.7A DE102016003883A1 (de) | 2016-03-31 | 2016-03-31 | Photogrammetrietafel, Photogrammetrieanordnung und Photogrammetrieverfahren |
PCT/EP2017/000373 WO2017167440A2 (de) | 2016-03-31 | 2017-03-28 | Photogrammetrietafel, photogrammetrieanordnung und photogrammetrieverfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3436776A2 true EP3436776A2 (de) | 2019-02-06 |
Family
ID=58547466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17717320.0A Withdrawn EP3436776A2 (de) | 2016-03-31 | 2017-03-28 | Photogrammetrietafel, photogrammetrieanordnung und photogrammetrieverfahren |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190078881A1 (de) |
EP (1) | EP3436776A2 (de) |
DE (1) | DE102016003883A1 (de) |
WO (1) | WO2017167440A2 (de) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11513483A (ja) * | 1995-09-21 | 1999-11-16 | オムニプラナー,インコーポレーテッド | 位置及び方位を決定する方法及び装置 |
US7190826B2 (en) * | 2003-09-16 | 2007-03-13 | Electrical Geodesics, Inc. | Measuring the location of objects arranged on a surface, using multi-camera photogrammetry |
DE102004028635A1 (de) * | 2004-06-15 | 2006-01-19 | Burkhard Heins | Verfahren zur Vermessung von Gegenständen mit einer Kamera |
US20070065004A1 (en) * | 2005-08-01 | 2007-03-22 | Topcon Corporation | Three-dimensional measurement system and method of the same, and color-coded mark |
DE102007039077A1 (de) * | 2007-08-19 | 2009-03-05 | Fachhochschule Gießen-Friedberg | Signalmarken und Verfahren zur photogrammetrischen Vermessung von geometrisch unregelmäßigen Objekten |
DE202009013470U1 (de) * | 2009-10-06 | 2010-02-04 | Remer, Nils | Markierungsfläche für die photogrammatrische Vermessung einer Geländefläche |
EP2477000A1 (de) * | 2011-01-14 | 2012-07-18 | Leica Geosystems AG | Vermessungsgerät mit einer automatischen Darstellungswechsel-Funktionalität |
JP6302618B2 (ja) * | 2012-08-10 | 2018-03-28 | 株式会社大林組 | 建設部材の設置精度の測定システム及び方法 |
US9429425B2 (en) * | 2013-03-05 | 2016-08-30 | Here Global B.V. | Aerial image collection |
US20150382123A1 (en) * | 2014-01-16 | 2015-12-31 | Itamar Jobani | System and method for producing a personalized earphone |
US20150240987A1 (en) * | 2014-02-25 | 2015-08-27 | The Boeing Company | Method and Apparatus for Removably Attaching Photogrammetric Targets to a Surface |
-
2016
- 2016-03-31 DE DE102016003883.7A patent/DE102016003883A1/de not_active Withdrawn
-
2017
- 2017-03-28 WO PCT/EP2017/000373 patent/WO2017167440A2/de active Application Filing
- 2017-03-28 EP EP17717320.0A patent/EP3436776A2/de not_active Withdrawn
- 2017-03-28 US US16/082,403 patent/US20190078881A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2017167440A8 (de) | 2018-03-01 |
DE102016003883A1 (de) | 2017-10-05 |
WO2017167440A3 (de) | 2017-11-16 |
WO2017167440A2 (de) | 2017-10-05 |
US20190078881A1 (en) | 2019-03-14 |
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